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          "en" => "<p id="spar0060" class="elsevierStyleSimplePara elsevierViewall">The PKC&#603;&#47;PKD&#47;ERK5 pathway is involved in angiotensin II &#40;Ang II&#41;-induced MEF2D activation&#46; &#40;A&#41; Cardiomyocytes were stimulated with Ang II for different times &#40;0-60 min&#41;&#46; Phosphorylated MEF2D protein levels were examined using Western blotting and normalized to the total levels of MEF2D&#46; Data are shown as the mean &#177; standard error of the mean of four separate experiments&#46; &#42;p&#60;0&#46;05 vs&#46; control without Ang II stimulation&#59; &#40;B&#41; cardiomyocytes were treated without or with Ang II &#40;100 nM&#41; and in the absence or presence of PKC&#603;&#44; PKD or ERK5 small interfering RNA &#40;siRNA&#41;&#46; &#42;p&#60;0&#46;05 vs&#46; control siRNA&#43; Ang II&#40;-&#41;&#59; &#35;p&#60;0&#46;05 vs&#46; control siRNA&#43;Ang II&#40;&#43;&#41;&#46;</p>"
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    "textoCompleto" => "<span class="elsevierStyleSections"><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0065">Introduction</span><p id="par0005" class="elsevierStylePara elsevierViewall">The onset of heart failure is typically preceded by cardiac hypertrophy&#44; a response of the heart to increased workload&#44; a cardiac insult such as a heart attack&#44; or a genetic mutation&#46; Hypertrophy initially develops as an adaptive response to physiological and pathological stimuli&#44; but pathological hypertrophy generally progresses to heart failure&#46; Cardiac hypertrophy is usually characterized by cardiomyocyte hypertrophy and thickening of ventricular walls&#46;<a class="elsevierStyleCrossRefs" href="#bib0180"><span class="elsevierStyleSup">1&#44;2</span></a> Although treating various pathways and targets has been reported to be effective&#44; pathological cardiac hypertrophy inevitably leads to the unfavorable outcomes of heart failure&#46;<a class="elsevierStyleCrossRefs" href="#bib0190"><span class="elsevierStyleSup">3&#44;4</span></a> It is therefore important to find novel therapeutic targets for hypertrophy&#46;</p><p id="par0010" class="elsevierStylePara elsevierViewall">Protein kinase D &#40;PKD&#41; has unique structural&#44; enzymatic and regulatory properties that are different from those of the PKC family members&#46; In unstimulated cells&#44; PKD is in a state of low catalytic kinase activity&#46; In response to cellular stimuli&#44; it is converted into a form with high catalytic activity via phosphorylation at Ser744&#47;748 in the activation loop of the PKD catalytic domain as well as the autophosphorylation of Ser916&#46; PKD has been best characterized for its role in regulating myocardial contraction&#44; cardiac hypertrophy and remodeling&#46;<a class="elsevierStyleCrossRefs" href="#bib0200"><span class="elsevierStyleSup">5&#44;6</span></a> PKD is a typical histone deacetylase 5 &#40;HDAC5&#41; kinase and thus more relevant to HDAC5-myocyte enhancer factor 2 &#40;MEF2&#41; hypertrophic signaling&#46;<a class="elsevierStyleCrossRef" href="#bib0210"><span class="elsevierStyleSup">7</span></a> Mice with PKD ablation show substantial resistance to cardiac hypertrophy&#46;<a class="elsevierStyleCrossRef" href="#bib0215"><span class="elsevierStyleSup">8</span></a></p><p id="par0015" class="elsevierStylePara elsevierViewall">Recent studies have implicated extracellular signal-regulated protein kinase 5 &#40;ERK5&#41; as a potential signal transducer for cardiac hypertrophy&#46;<a class="elsevierStyleCrossRef" href="#bib0220"><span class="elsevierStyleSup">9</span></a> Activated ERK5 transfers from cytoplasm to nucleus&#44; where it exhibits transcriptional regulatory activity by phosphorylating MEF2&#46;<a class="elsevierStyleCrossRef" href="#bib0225"><span class="elsevierStyleSup">10</span></a> Notably&#44; the transcription factor MEF2 promotes cardiac hypertrophy in transgenic mice&#44; while targeted deletion of this kinase attenuates the hypertrophic response mediated by MEF2 activation in vivo&#46;<a class="elsevierStyleCrossRefs" href="#bib0230"><span class="elsevierStyleSup">11&#44;12</span></a> Our previous studies have indicated that protein kinase C epsilon &#40;PKC&#603;&#41;-dependent ERK5 activation and nuclear translocation is involved in cardiomyocyte hypertrophy induced by angiotensin II &#40;Ang II&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0240"><span class="elsevierStyleSup">13</span></a></p><p id="par0020" class="elsevierStylePara elsevierViewall">The aim of this study was to determine the potential role of PKD in Ang II-mediated cardiomyocyte hypertrophy&#46; The results presented here demonstrate that Ang II rapidly induces activation of PKD via PKC&#603;&#44; which subsequently leads to ERK5-activated translocation&#44; myocyte enhancer factor 2D &#40;MEF2D&#41; transcriptional activation&#44; and cardiomyocyte hypertrophy&#46; Based on our findings&#44; we suggest that the PKC&#603;&#47;PKD&#47;ERK5&#47;MEF2D pathway is implicated in Ang II-induced cardiomyocyte hypertrophy&#46;</p></span><span id="sec0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0070">Methods</span><span id="sec0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0075">Materials</span><p id="par0025" class="elsevierStylePara elsevierViewall">All basic laboratory reagents and Ang II were obtained from Sigma-Aldrich &#40;St&#46; Louis&#44; MO&#41;&#46; Nuclear and cytoplasmic protein extraction reagents were purchased from Thermo Fisher Scientific &#40;Waltham&#44; MA&#41;&#46; Antibodies against &#946;-actin and lamin B1 were purchased from Proteintech Group Inc&#46; &#40;Rosemont&#44; IL&#41;&#46; Antibodies against PKD&#44; MEF2D&#44; phospho-PKD744&#47;748&#44; phospho-PKD916&#44; and phospho-MEF2D were obtained from Cell Signaling Technology &#40;Cambridge&#44; MA&#41;&#59; antibodies against PKC&#603;&#44; ERK5&#44; and phospho-ERK5 from Cayman Chemicals &#40;Ann Arbor&#44; MI&#41;&#44; SDS-polyacrylamide gels from Pierce &#40;Rockford&#44; IL&#41;&#44; and PVDF and proteingel apparatus from Bio-Rad &#40;Hercules&#44; CA&#41;&#46; Minimal essential medium &#40;MEM&#41;&#44; fetal bovine serum&#44; phosphate buffered saline &#40;PBS&#41;&#44; penicillin&#47;streptomycin&#44; non-essential amino acids&#44; and <span class="elsevierStyleSmallCaps">l</span>-glutamine were obtained from Sigma-Aldrich &#40;St&#46; Louis&#44; MO&#41;&#46;</p></span><span id="sec0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0080">Cell cultures</span><p id="par0030" class="elsevierStylePara elsevierViewall">Animals used in these experiments were handled in accordance with the Guiding Principles in the Care and Use of Animals&#44; approved by the experimental animal ethics committee of Shandong Provincial Hospital Affiliated to Shandong First Medical University&#46; Neonatal rat cardiomyocytes from 2- to 3-day-old Sprague-Dawley rats were prepared as previously described&#46;<a class="elsevierStyleCrossRef" href="#bib0355"><span class="elsevierStyleSup">14</span></a> Briefly&#44; cells were obtained by trypsinization after gentle mechanical disruption and grown in MEM &#40;5 ml penicillin&#47;streptomycin&#44; 5 ml non-essential amino acids&#44; 5 ml <span class="elsevierStyleSmallCaps">l</span>-glutamine and 10&#37; FBS in 500 ml of MEM&#41; at 37<span class="elsevierStyleHsp" style=""></span>&#176;C and 5&#37; CO<span class="elsevierStyleInf">2</span>&#46; Cardiomyocytes were cultured as monolayers at 5&#215;10<span class="elsevierStyleSup">4</span> cells&#47;cm<span class="elsevierStyleSup">2</span> and incubated with Ang II at different times and various dosages&#46; Prior to stimulation&#44; all cells were placed in serum-reduced medium &#40;0&#46;1&#37; FBS&#41; for 24 h to maintain quiescence&#46;</p></span><span id="sec0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0085">Nuclear and cytoplasmic fractionation</span><p id="par0035" class="elsevierStylePara elsevierViewall">Nuclear and cytoplasmic protein extraction reagents were used according to the manufacturer&#39;s instructions&#46; Cells were washed with cold PBS&#44; suspended in ice-cold buffer F &#40;210 mM mannitol&#44; 70 mM sucrose&#44; 5 mM Tris&#44; pH 7&#46;5&#44; 1 mM EDTA&#44; supplemented with protease inhibitors&#41;&#44; left in the buffer for 15 min on ice and then Dounce homogenized &#40;15 strokes&#41;&#46; The nuclei were separated by centrifugation &#40;500 <span class="elsevierStyleItalic">g</span>&#44; 5 min&#44; 4<span class="elsevierStyleHsp" style=""></span>&#176;C&#41;&#46; The supernatant containing the cytosolic fraction was boiled in sample buffer&#46; The pellet containing the nuclei was washed with PBS and then resuspended in RIPA buffer for 5 min on ice&#44; centrifuged again and the supernatant &#40;nuclear fraction&#41; was boiled in sample buffer&#46; The same volumes of nuclear and cytosolic fractions were analyzed&#46;</p></span><span id="sec0030" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0090">Western blot analysis</span><p id="par0040" class="elsevierStylePara elsevierViewall">Cardiomyocytes were lysed in ice-cold lysis buffer &#40;150 mM NaCl&#44; 5 mM MgCl<span class="elsevierStyleInf">2</span>&#44; 1 mM phenylmethylsulfonyl fluoride&#44; 1 mM dithiothreitol&#44; 1 mM sodium orthovanadate&#44; 1 mM sodium phosphate&#44; 1&#37; Triton X-100&#44; 0&#46;5&#37; SDS&#44; 10 &#956;g&#47;ml aprotinin&#44; 10 &#956;g&#47;ml leupetin&#44; 50 mM HEPES&#44; pH 7&#46;5&#41;&#46; Crude lysates were sonicated and centrifuged at 10 000 rpm for 5 min at 4<span class="elsevierStyleHsp" style=""></span>&#176;C&#46; Total protein concentration from the resulting supernatant was determined by bicinchoninic acid protein assay &#40;Pierce&#44; Rockford&#44; IL&#41; and normalized to 1 mg&#47;ml&#46; Aliquots of whole cell lysates were dried in a SpeedVac Concentrator &#40;Savant&#44; Holbrook&#44; NY&#41;&#44; denatured in Laemmli sample buffer&#44; and stored at -20<span class="elsevierStyleHsp" style=""></span>&#176;C until use&#46; Samples were boiled for 10 min&#44; and 30 &#956;g protein per lane was resolved on SDS-PAGE before being transferred to PVDF membranes&#46; Membranes were incubated at 4<span class="elsevierStyleHsp" style=""></span>&#176;C overnight with appropriate primary antibodies &#40;rabbit polyclonal anti-PKD&#44; anti-p-PKD&#44; anti-MEF2D&#44; anti-phosphorylated MEF2D diluted 1&#58;1000 &#40;Cell Signaling Technology &#91;Cambridge&#44; MA&#93;&#41;&#44; and anti-ERK5&#44; anti-phosphorylated ERK5 &#40;p-ERK5&#41; diluted 1&#58;800 &#40;Cayman Chemicals&#44; Ann Arbor&#41;&#46; After washing&#44; the membrane was incubated with the corresponding horseradish peroxidase-conjugated secondary antibody&#46; Immunoreactive bands were visualized with the SuperSignal West Pico enhanced chemiluminescence kit &#40;Pierce&#44; Rockford&#44; IL&#41; according to the manufacturer&#39;s instructions&#46; Densitometric quantification was performed using Image-Pro Plus software with &#946;-actin&#44; lamin B1&#44; PKD&#44; ERK5&#44; or MEF2D for normalization&#46;</p></span><span id="sec0035" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0095">Immunofluorescence staining</span><p id="par0045" class="elsevierStylePara elsevierViewall">Cells cultured on glass coverslips were washed with PBS and fixed in 2&#37; paraformaldehyde for 30 min at room temperature&#44; followed by two rinses in PBS&#46; Monolayers were then permeabilized three times for 10 min each&#44; with PBS supplemented with 0&#46;1&#37; &#40;final concentration&#41; Triton X-100 and then blocked twice in PBS with 0&#46;2&#37; BSA for 10 min each at room temperature&#46; Cells were incubated with 1&#47;100 anti-phospho-ERK5 or anti-&#945;-actinin &#40;69758S&#44; Cell Signaling Technology &#91;Cambridge&#44; MA&#93;&#41; in blocking solution overnight at 4<span class="elsevierStyleHsp" style=""></span>&#176;C&#46; Coverslips incubated with rabbit polyclonal IgG&#44; instead of primary antiserum&#44; served as negative controls&#46; After three washes for 10 min each in PBS with 0&#46;2&#37; BSA&#44; coverslips were incubated with goat-anti-rabbit secondary antibody for 30 min and washed three times in PBS with 0&#46;2&#37; BSA&#46; Immunolabeled cells were counterstained with DAPI to detect cell nuclei&#44; then the slides were mounted&#46; Samples were analyzed by confocal immunofluorescence microscopy with a Zeiss LSM 510 system&#46; To avoid interference between fluorescence signals&#44; images were captured in multitracking mode&#46;</p></span><span id="sec0040" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0100">Real-time quantitative polymerase chain reaction</span><p id="par0050" class="elsevierStylePara elsevierViewall">Real-time quantitative polymerase chain reaction &#40;PCR&#41; was used to measure the mRNA levels of atrial natriuretic peptide &#40;ANP&#41; and brain natriuretic peptide &#40;BNP&#41;&#44; which are biomarkers of cardiac hypertrophy&#44; using a SYBR Green PCR kit &#40;Qiagen&#44; Inc&#46;&#44; Valencia&#44; CA&#41;&#44; according to the manufacturer&#39;s protocol&#46; The following primers were used for real-time PCR&#58; 5&#8242;-CGT ATA CAG TGC GGT GTC CA-3&#8242; and 5&#8242;-GGT TGA CTT CCC CAG TCC AG-3&#8242; for ANP&#59; 5&#8242;-AGC TGC TGG AGC TGA TAA GAG-3&#8242; and 5&#8242;-CTG CCC AAA GCA GCT TGA AC-3&#8242; for BNP&#59; and 5&#8242;-AAG AAG GTG GTG AAG CAG GC-3&#8242; and 5&#8242;-TCC ACC ACC CTG TTG CTG TA-3&#8242; for GAPDH&#46; Amplification and detection were performed with the ABI 7500 Sequence Detection System &#40;Applied Biosystems&#44; Foster City&#44; CA&#41;&#46; The final real-time PCR analysis results are presented as the ratio of the mRNA of interest to that of GAPDH&#44; which was used as an internal control&#46; The relative mRNA levels were calculated using the 2<span class="elsevierStyleSup">-&#9651;&#9651;Ct</span> method&#46;</p></span><span id="sec0045" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0105">Small interfering RNA and its transfection</span><p id="par0055" class="elsevierStylePara elsevierViewall">The PKC&#603;-specific small interfering RNA &#40;siRNA&#41; sequences used were as follows&#58; &#35;1&#44; 5&#8242;-AAGATCGAGCTGGCTGTCTTT-3&#8242;&#59; &#35;2&#44; 5&#8242;-TTCTAGCTCGACCGACAGAAA-3&#8242;&#59; PKD&#58; &#35;1&#44; 5&#8242;-GGAGGGCGAUCUUAUUGAATT- 3&#8242;&#59; &#35;2&#44; 5&#8242;-CAGCAAACGUAGUGUAUUATT-3&#8242;&#59; &#35;3&#44; 5&#8242;-CGCUAUAUUACCCAUGAAATT-3&#8242;&#59; ERK5&#58; &#35;1&#44; 5&#8242;-CAUGAACCCUGCCGAUAUUUU-3&#8242;&#59; &#35;2&#44; 5&#8242;-AAACCAGUCUUUCGACAUGUU-3&#8242;&#59; &#35;3&#44; 5&#8242;-GAACUGUGAGCUCAAGAUUUU-3&#8242;&#46; They were obtained from Genepharma &#40;Shanghai&#44; China&#41;&#46; Proliferating cells were removed by trypsinization&#44; seeded into 60-mm dishes&#44; and incubated for 24 h until they reached 60&#37; confluence&#46; Transfection of cardiomyocytes was achieved using Lipofectamine 2000 &#40;Invitrogen&#41; according to the manufacturer&#39;s protocol&#44; with 100 nM non-targeting control siRNA or SMART pool siRNA for PKC&#603;&#44; PKD and ERK5&#46; After 48 h&#44; cells were exposed to Ang II as indicated&#44; and lysates underwent Western blot analysis&#46;</p></span><span id="sec0050" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0110">Measurement of cell diameter and &#91;3H&#93;-leucine incorporation</span><p id="par0060" class="elsevierStylePara elsevierViewall">To determine cell hypertrophy&#44; cell diameter and &#91;3H&#93;-leucine &#40;Leu&#41; incorporation were measured&#46; After being digested&#44; centrifuged and resuspended in MEM&#44; cells were counted in at least three dishes at each time point by phase-contrast microscopy&#46; Cell diameter was measured using a digital photography analysis system&#46; Ten fields were randomly chosen for each group&#44; and 10 cardiomyocytes were determined for each field&#46;</p><p id="par0065" class="elsevierStylePara elsevierViewall">&#91;3H&#93;-Leu incorporation in cardiomyocytes was assessed as described previously&#46; Cardiomyocytes were made quiescent by incubation in serum-free MEM for 24 h&#46; Cells were incubated with 1 &#956;Ci&#47;ml &#91;3H&#93;-Leu in the presence or absence of 100 nM Ang II&#46; After 24 h&#44; cells were washed twice with ice-cold PBS&#44; and the proteins were precipitated in 5&#37; trichloroacetic acid&#46; &#91;3H&#93;-Leu incorporation was determined using a scintillation counter&#46;</p></span><span id="sec0055" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0115">Statistical analysis</span><p id="par0070" class="elsevierStylePara elsevierViewall">The experimental results are expressed as the mean &#177; standard error of the mean of three or more independent experiments and analyzed by one-way ANOVA with post-hoc comparisons using the LSD test&#46; All statistical analyses were performed using IBM SPSS 22&#46;0 statistical software &#40;IBM SPSS&#44; Inc&#46;&#44; Chicago&#44; IL&#41;&#46; A p-value of &#60;0&#46;05 was considered statistically significant&#46;</p></span></span><span id="sec0060" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0120">Results</span><span id="sec0065" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0125">Angiotensin II induces PKC&#603;-dependent PKD phosphorylation in cardiomyocytes</span><p id="par0075" class="elsevierStylePara elsevierViewall">In accordance with our previous experiments&#44; we selected a concentration of 100 nm of Ang II&#46;<a class="elsevierStyleCrossRef" href="#bib0240"><span class="elsevierStyleSup">13</span></a> Ang II &#40;100 nmol&#47;l&#41; rapidly induced phosphorylation of PKD&#44; within 5 min&#44; with peak phosphorylation between 15 and 30 min&#44; returning to baseline after 60 min &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Figure 1</a>A&#41;&#44; which resembles the pattern of ERK5 phosphorylation in our previous experiments&#46;<a class="elsevierStyleCrossRef" href="#bib0240"><span class="elsevierStyleSup">13</span></a> During the course of Ang II stimulation&#44; there was no obvious change in PKD expression&#44; and &#946;-actin levels showed equal loading in each sample&#46; PKC&#603;-specific siRNA significantly inhibited Ang II-induced activation of PKD &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Figure 1</a>B&#41;&#46;</p><elsevierMultimedia ident="fig0005"></elsevierMultimedia></span><span id="sec0070" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0130">Knockdown of PKD by siRNA inhibited Ang II-induced activation of ERK5 in cardiomyocytes</span><p id="par0080" class="elsevierStylePara elsevierViewall">To gain insight into the functional significance of PKD activation in Ang II-mediated signaling events&#44; we determined whether knockdown of endogenous PKD in cardiomyocytes using siRNA affects Ang II-mediated ERK5 activation&#46; Cardiomyocytes were transfected with PKD siRNA for 48 h and then stimulated with Ang II for the time indicated&#46; Treatment of cardiomyocytes with PKD siRNA significantly reduced endogenous PKD expression&#44; whereas control siRNA had no effect&#46; PKD siRNA specifically targeted PKD since expression of &#946;-actin and ERK5 was not changed&#46; Decreasing PKD expression by its siRNA significantly inhibited Ang II-induced ERK5 activation in cardiomyocytes &#40;<a class="elsevierStyleCrossRef" href="#fig0010">Figure 2</a>&#41;&#46;</p><elsevierMultimedia ident="fig0010"></elsevierMultimedia></span><span id="sec0075" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0135">Angiotensin II stimulates ERK5 translocation via the PKC&#603;&#47;PKD-dependent pathway</span><p id="par0085" class="elsevierStylePara elsevierViewall">Our previous studies showed that ERK5 was located primarily in the cytoplasm of cardiomyocytes before stimulation&#59; nuclear entry was seen at 5 min after Ang II stimulation&#59; marked translocation from the cytoplasm to the nucleus was observed by 15 min after addition of Ang II&#59; and after 60 min of Ang II treatment&#44; ERK5 was gradually shuttled back to the cytoplasm&#46;<a class="elsevierStyleCrossRef" href="#bib0240"><span class="elsevierStyleSup">13</span></a> To gain further insights into the signaling pathways leading to Ang II-induced translocation of ERK5&#44; we studied the effects of PKD&#46; Knocking down PKD expression by siRNA greatly attenuated Ang II-induced translocation of ERK5 in cardiomyocytes &#40;<a class="elsevierStyleCrossRef" href="#fig0015">Figure 3</a>A&#41;&#46;</p><elsevierMultimedia ident="fig0015"></elsevierMultimedia><p id="par0090" class="elsevierStylePara elsevierViewall">We also demonstrated changes in the proportion of p-ERK5 content between the nucleus and cytoplasm&#46; We found an increase in nuclear content of p-ERK5 and a concomitant decrease in cytoplasmic content under Ang II stimulation&#46; Silencing PKD by siRNA significantly reduced the expression of ERK5 in the nucleus &#40;<a class="elsevierStyleCrossRef" href="#fig0015">Figure 3</a>B&#41;&#46;</p><p id="par0095" class="elsevierStylePara elsevierViewall">Our previous studies confirmed that PKC&#603;-mediated ERK5 translocation was involved in cardiomyocyte hypertrophy due to Ang II&#46;<a class="elsevierStyleCrossRef" href="#bib0240"><span class="elsevierStyleSup">13</span></a> Taken together&#44; these results suggest that the PKC&#603;&#47;PKD pathway plays a part in the nucleocytoplasmic traffic of ERK5 in cardiomyocytes&#46;</p></span><span id="sec0080" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0140">The PKC&#603;&#47;PKD&#47;ERK5 pathway is involved in angiotensin II-induced activation of MEF2D</span><p id="par0100" class="elsevierStylePara elsevierViewall">To determine whether the PKC&#603;&#47;PKD&#47;ERK5 pathway plays an important role in Ang II-induced phosphorylation of MEF2D in cardiomyocytes&#44; we examined the effect of PKC&#603;&#44; PKD and ERK5 siRNA on Ang II-induced MEF2D activation&#46; Ang II induced phosphorylation of MEF2D after 5 min&#44; with peak phosphorylation at 15 min&#44; returning to baseline levels by 30 min &#40;p&#60;0&#46;05&#41; &#40;<a class="elsevierStyleCrossRef" href="#fig0020">Figure 4</a>A&#41;&#46; Knocking down PKC&#603;&#44; PKD and ERK5 expression by siRNA all significantly attenuated activation of MEF2D &#40;<a class="elsevierStyleCrossRef" href="#fig0020">Figure 4</a>B&#41;&#46;</p><elsevierMultimedia ident="fig0020"></elsevierMultimedia></span><span id="sec0085" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0145">The PKC&#603;&#47;PKD&#47;ERK5 pathway is involved in angiotensin II-induced expression of ANP and BNP mRNA</span><p id="par0105" class="elsevierStylePara elsevierViewall">As the targets of MEF2D&#44; ANP and BNP are biomarkers of cardiac hypertrophy&#46; Compared with controls&#44; Ang II significantly increased the mRNA expression of ANP and BNP&#44; while PKC&#603;&#44; PKD and ERK5 siRNA treatment attenuated these increases &#40;<a class="elsevierStyleCrossRef" href="#fig0025">Figure 5</a>&#41;&#46;</p><elsevierMultimedia ident="fig0025"></elsevierMultimedia></span><span id="sec0090" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0150">The PKC&#603;&#47;PKD&#47;ERK5 pathway is implicated in angiotensin II-stimulated cardiomyocyte hypertrophy</span><p id="par0110" class="elsevierStylePara elsevierViewall">Both &#91;3H&#93;-Leu incorporation and cell size were significantly greater in Ang II-treated &#40;100 nM&#41; cells than in controls &#40;p&#60;0&#46;05&#41;&#46; Immunostaining for a cardiomyocyte marker &#40;&#945;-actinin&#41; is included to attest the purity of the primary cultures &#40;<a class="elsevierStyleCrossRef" href="#fig0030">Figure 6</a>A&#41;&#46; Previous studies confirmed that the PKC&#603;&#47;ERK5 pathway participates in Ang II-induced cardiomyocyte hypertrophy&#46; In this study&#44; we confirmed the involvement of PKD in this process&#46; As shown in <a class="elsevierStyleCrossRef" href="#fig0030">Figure 6</a>B and C&#44; Ang II promotes cardiomyocyte hypertrophy&#44; while PKC&#603;&#44; PKD and ERK5 siRNA greatly inhibited hypertrophy&#46; PKD siRNA strongly suppressed Ang II-induced &#91;3H&#93;-Leu incorporation &#40;p&#60;0&#46;05&#41;&#46; Moreover&#44; Ang II treatment increased the cell size of cardiomyocytes&#44; whereas PKC&#603;&#44; PKD and ERK5 siRNA markedly decreased cell size &#40;<a class="elsevierStyleCrossRef" href="#fig0030">Figure 6</a>D&#41;&#46; These results suggest that the PKC&#603;&#47;PKD&#47;ERK5 pathway plays pivotal roles in Ang II-induced cardiomyocyte hypertrophy&#46;</p><elsevierMultimedia ident="fig0030"></elsevierMultimedia></span></span><span id="sec0095" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0155">Discussion</span><p id="par0115" class="elsevierStylePara elsevierViewall">Cardiac hypertrophy is an adaptive and compensatory mechanism preserving cardiac output during hypertension&#46; Nevertheless&#44; long-term stimuli incite chronic hypertrophy and may lead to heart failure&#46; Inappropriate activation of the renin-angiotensin-aldosterone system &#40;RAAS&#41; plays an important role in this process&#46; Ang II&#44; the main effector of the RAAS&#44; is increased in patients and animal models of hypertension and cardiac hypertrophy&#46; Ang II can induce cardiomyocyte hypertrophy in vitro&#46; A large number of intracellular pathways have been associated with this hypertrophic response&#46;<a class="elsevierStyleCrossRef" href="#bib0360"><span class="elsevierStyleSup">15</span></a> These pathways are intertwined&#44; generating a complex response that is still not completely understood&#46; In this study&#44; we provide evidence that PKD activation is one of the early signaling events in cardiomyocytes in response to Ang II&#46;</p><p id="par0120" class="elsevierStylePara elsevierViewall">The experiments presented here were designed to elucidate the underlying mechanisms of cardiomyocyte hypertrophy by Ang II&#46; In the present study&#44; we demonstrated that Ang II stimulated PKD phosphorylation in a time-dependent manner in cardiomyocytes&#46; PKC&#603; is the specific upstream regulator of PKD&#44; and inhibiting PKC&#603; by siRNA reduced PKD activation&#46; Furthermore&#44; PKD is critical in ERK5 phosphorylation and translocation&#44; since silencing PKD by siRNA blocked ERK5 activation and nucleocytoplasmic traffic&#46; Importantly&#44; the PKC&#603;&#47;PKD&#47;ERK5 pathway plays a significant role in MEF2D activation and ANP and BNP mRNA expression&#44; and contributes to Ang II-induced cardiomyocyte hypertrophy&#44; as shown by significantly increased &#91;3H&#93;-Leu incorporation&#46; This is the first report to show the critical role of the PKC&#603;&#47;PKD&#47;ERK5&#47;MEF2D pathway in cardiomyocyte hypertrophy&#44; which may provide new insights into the molecular mechanisms of cardiac remodeling observed in animal models and in humans&#46;</p><p id="par0125" class="elsevierStylePara elsevierViewall">PKC&#603; is activated in response to hypertrophic stimuli in cultured myocytes and in vivo&#59; overexpression and activation of PKC&#603; results in myocardial hypertrophy&#46;<a class="elsevierStyleCrossRef" href="#bib0250"><span class="elsevierStyleSup">16</span></a> Cardiac-specific transgenic mice overexpressing a constitutively active PKC&#603; mutant developed cardiac hypertrophy&#46;<a class="elsevierStyleCrossRef" href="#bib0255"><span class="elsevierStyleSup">17</span></a> Our previous studies found involvement of PKC&#603; in Ang II-induced cardiomyocyte hypertrophy&#46; Knocking down PKC&#603; by specific siRNA strongly blocked Ang II-stimulated activation and translocation of ERK5 as well as &#91;3H&#93;-Leu incorporation in cardiomyocytes&#46;<a class="elsevierStyleCrossRef" href="#bib0240"><span class="elsevierStyleSup">13</span></a></p><p id="par0130" class="elsevierStylePara elsevierViewall">PKD lies downstream of PKCs in a novel signal transduction pathway implicated in the regulation of multiple fundamental biological processes&#46; In recent years&#44; PKD has been implicated as a signal transducer in cardiac hypertrophy&#46;<a class="elsevierStyleCrossRef" href="#bib0260"><span class="elsevierStyleSup">18</span></a> Knockdown of PKD expression with siRNA blunts agonist-dependent hypertrophy&#44; whereas in vivo cardiac-specific expression of constitutively active PKD causes a brief phase of cardiac hypertrophy&#46;<a class="elsevierStyleCrossRef" href="#bib0355"><span class="elsevierStyleSup">14</span></a> Specific cellular processes that appear to be under PKD control include transcriptional factor activation&#46;<a class="elsevierStyleCrossRef" href="#bib0270"><span class="elsevierStyleSup">19</span></a> Activated PKD&#44; perhaps along with other histone deacytelase &#40;HDAC&#41; kinases&#44; primarily promotes MEF2 expression and activation by inducing class II HDAC phosphorylation and nuclear export&#46; A-kinase anchoring protein 13 &#40;AKAP13&#41; has been well documented as a vital component of the MEF2-mediated fetal gene response and the cardiac hypertrophic signaling cascade&#46;<a class="elsevierStyleCrossRefs" href="#bib0275"><span class="elsevierStyleSup">20&#44;21</span></a> AKAP13 binds PKD near the C-terminus of the protein&#44;<a class="elsevierStyleCrossRef" href="#bib0285"><span class="elsevierStyleSup">22</span></a> and upon activation by PKC&#44; PKD dissociates from AKAP13 and phosphorylates HDAC5 in the nucleus&#44; causing dissociation of HDAC5 from MEF2&#46;<a class="elsevierStyleCrossRefs" href="#bib0285"><span class="elsevierStyleSup">22&#44;23</span></a></p><p id="par0135" class="elsevierStylePara elsevierViewall">The MEF2 family has four members&#58; MEF2A&#44; MEF2B&#44; MEF2C and MEF2D&#46; There is increasing evidence that MEF2C and MEF2D both act as hypertrophy mediators&#46; Expression of MEF2C was increased in both cardiomyocytes and human aortic smooth muscle cells &#40;HASMCs&#41; in Ang II-induced hypertrophy&#46;<a class="elsevierStyleCrossRefs" href="#bib0240"><span class="elsevierStyleSup">13&#44;24</span></a> MEF2D-null mice were resistant to cardiac hypertrophy in response to pressure overload and chronic adrenergic stimulation&#46;<a class="elsevierStyleCrossRef" href="#bib0300"><span class="elsevierStyleSup">25</span></a> Our previous studies also confirmed that PKD participates in cardiac hypertrophy by regulating MEF2D in spontaneously hypertensive rats&#46;<a class="elsevierStyleCrossRef" href="#bib0305"><span class="elsevierStyleSup">26</span></a> Consistent with this&#44; our study showed that Ang II induces PKC&#603;&#47;PKD-dependent MEF2D activation and cardiomyocyte hypertrophy&#46; Inhibiting PKC&#603; or PKD by specific siRNA strongly reduced activation of MEF2D&#46;</p><p id="par0140" class="elsevierStylePara elsevierViewall">It has been demonstrated that ERK5 is involved in the development of detrimental hypertrophy in different pathological systems&#46;<a class="elsevierStyleCrossRef" href="#bib0310"><span class="elsevierStyleSup">27</span></a> Mice with cardiomyocyte-specific deletion of ERK5 showed a reduced hypertrophic response during pressure overload&#46;<a class="elsevierStyleCrossRef" href="#bib0315"><span class="elsevierStyleSup">28</span></a> ERK5 is closely associated with the activation of MEF2 transcription factors&#46;<a class="elsevierStyleCrossRef" href="#bib0320"><span class="elsevierStyleSup">29</span></a> In sensory neurons&#44; the ERK5&#47;MEF2D pathway strictly regulates expression of Bcl-w&#44; an anti-apoptopic bcl-2 family member&#44; which promotes sensory neuron survival&#46;<a class="elsevierStyleCrossRef" href="#bib0325"><span class="elsevierStyleSup">30</span></a> A groundbreaking finding revealed that activation of MEF2C&#47;D transcription factors promotes early B-cell development&#44; which depends on their phosphorylation by ERK5&#46;<a class="elsevierStyleCrossRef" href="#bib0330"><span class="elsevierStyleSup">31</span></a> In the present study&#44; we ascertained that Ang II-induced ERK5 phosphorylation resulted in MEF2D activation and subsequent cardiomyocyte hypertrophy&#46; Knocking down ERK5 by siRNA significantly attenuated MEF2D activation and &#91;3H&#93;-Leu incorporation&#46;</p><p id="par0145" class="elsevierStylePara elsevierViewall">The subcellular location of ERK5 was cell type-specific&#46;<a class="elsevierStyleCrossRefs" href="#bib0335"><span class="elsevierStyleSup">32&#44;33</span></a> Recently&#44; a mechanism for the nucleocytoplasmic transport of ERK5 has been proposed&#46; ERK5 has nuclear localizing activity in its C-terminal region&#44; owing to a bipartite nuclear localization signal&#46;<a class="elsevierStyleCrossRefs" href="#bib0340"><span class="elsevierStyleSup">33&#44;34</span></a> In addition&#44; ERK5 has nuclear export activity&#46;<a class="elsevierStyleCrossRef" href="#bib0350"><span class="elsevierStyleSup">35</span></a> The balance between nuclear import and export determines the subcellular localization of ERK5&#46;<a class="elsevierStyleCrossRef" href="#bib0345"><span class="elsevierStyleSup">34</span></a> A previous study showed that ERK5 is mainly cytosolic in quiescent cardiomyocytes&#44; but translocates to the nucleus during activation by Ang II&#46; PKC&#603; is critical for ERK5 nuclear entry&#46;<a class="elsevierStyleCrossRef" href="#bib0240"><span class="elsevierStyleSup">13</span></a></p><p id="par0150" class="elsevierStylePara elsevierViewall">Our previous studies showed that the PKD&#47;ERK5 pathway plays an important role in Ang II-induced hypertrophy of HASMCs&#46;<a class="elsevierStyleCrossRef" href="#bib0295"><span class="elsevierStyleSup">24</span></a> But the effect of PKD on ERK5 in cardiomyocytes was still unclear&#46; Since they have a similar activation pattern and common upstream and downstream molecules&#44; we speculate that PKD plays a critical role in ERK5 phosphorylation and translocation in cardiomyocytes by Ang II&#46; In agreement with this&#44; the present study found that knocking down PKD by siRNA attenuated Ang II-stimulated ERK5 phosphorylation&#44; followed by decreased translocation&#46;</p></span><span id="sec0100" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0160">Conclusion</span><p id="par0155" class="elsevierStylePara elsevierViewall">In summary&#44; we demonstrate for the first time that Ang II induces PKD-dependent ERK5 phosphorylation and translocation in cardiomyocytes&#46; The PKC&#603;&#47;PKD&#47;ERK5 pathway also plays an essential role in Ang II-stimulated MEF2D activation and cardiomyocyte hypertrophy&#46; These results provide new insights into the molecular underpinnings of cardiomyocyte hypertrophy in response to Ang II&#46; These findings may provide novel targets for therapeutic manipulation through pharmacological or genetic approaches to pathological cardiac remodeling in hypertension&#46;</p></span><span id="sec0105" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0165">Conflicts of interest</span><p id="par0160" class="elsevierStylePara elsevierViewall">The authors have no conflicts of interest to declare&#46;</p></span></span>"
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              "titulo" => "Nuclear and cytoplasmic fractionation"
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              "titulo" => "Small interfering RNA and its transfection"
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              "titulo" => "Angiotensin II induces PKC&#603;-dependent PKD phosphorylation in cardiomyocytes"
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              "titulo" => "Knockdown of PKD by siRNA inhibited Ang II-induced activation of ERK5 in cardiomyocytes"
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              "titulo" => "Angiotensin II stimulates ERK5 translocation via the PKC&#603;&#47;PKD-dependent pathway"
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              "titulo" => "The PKC&#603;&#47;PKD&#47;ERK5 pathway is involved in angiotensin II-induced activation of MEF2D"
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              "titulo" => "The PKC&#603;&#47;PKD&#47;ERK5 pathway is involved in angiotensin II-induced expression of ANP and BNP mRNA"
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              "titulo" => "The PKC&#603;&#47;PKD&#47;ERK5 pathway is implicated in angiotensin II-stimulated cardiomyocyte hypertrophy"
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            0 => "Protein kinase C epsilon"
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            2 => "Extracellular signal-regulated protein kinase 5"
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      "en" => array:3 [
        "titulo" => "Abstract"
        "resumen" => "<span id="abst0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0010">Objective</span><p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">Cardiomyocyte hypertrophy is an important feature of hypertension&#46; However&#44; its molecular underpinnings&#44; especially the signaling cascades&#44; remain unclear&#46; Here we hypothesized that a protein kinase D &#40;PKD&#41;-dependent extracellular signal-regulated kinase 5 &#40;ERK5&#41; pathway was able to regulate downstream myocyte enhancer factor 2D &#40;MEF2D&#41;&#44; affecting prohypertrophic responses to angiotensin II &#40;Ang II&#41;&#46;</p></span> <span id="abst0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0015">Methods</span><p id="spar0010" class="elsevierStyleSimplePara elsevierViewall">Neonatal rat cardiomyocytes from 2- to 3-day-old Sprague-Dawley rats were prepared and Western blot&#44; real-time quantitative PCR and immunofluorescence staining were used to assess the activation and translocation of pathway signaling molecules&#46; Atrial natriuretic peptide &#40;ANP&#41; and brain natriuretic peptide &#40;BNP&#41; expression and &#91;3H&#93;-leucine &#40;Leu&#41; incorporation were measured to determine cell hypertrophy&#46;</p></span> <span id="abst0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0020">Results</span><p id="spar0015" class="elsevierStyleSimplePara elsevierViewall">Elevated levels of phosphorylated PKD &#40;p-PKD&#41; and ERK5 &#40;p-ERK5&#41; were observed in cardiomyocytes stimulated with Ang II&#44; while silencing protein kinase C epsilon &#40;PKC&#603;&#41; resulted in significantly lower levels of p-PKD&#46; Furthermore&#44; Ang II-induced ERK5 activated translocation was mediated by the PKD pathway&#46; Consequently&#44; inhibiting PKC&#603;&#44; PKD and ERK5 by siRNA significantly attenuated Ang II-induced MEF2D activation&#44; ANP and BNP mRNA expression&#44; and &#91;3H&#93;-Leu incorporation&#46;</p></span> <span id="abst0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0025">Conclusions</span><p id="spar0020" class="elsevierStyleSimplePara elsevierViewall">Our studies are the first to show that the PKC&#603;&#47;PKD&#47;ERK5&#47;MEF2D pathway plays an important role in the cardiomyocyte hypertrophy response to Ang II&#46;</p></span>"
        "secciones" => array:4 [
          0 => array:2 [
            "identificador" => "abst0005"
            "titulo" => "Objective"
          ]
          1 => array:2 [
            "identificador" => "abst0010"
            "titulo" => "Methods"
          ]
          2 => array:2 [
            "identificador" => "abst0015"
            "titulo" => "Results"
          ]
          3 => array:2 [
            "identificador" => "abst0020"
            "titulo" => "Conclusions"
          ]
        ]
      ]
      "pt" => array:3 [
        "titulo" => "Resumo"
        "resumen" => "<span id="abst0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0035">Objetivos</span><p id="spar0025" class="elsevierStyleSimplePara elsevierViewall">A hipertrofia dos cardiomi&#243;citos &#233; uma caracter&#237;stica importante da hipertens&#227;o arterial&#46; No entanto&#44; os mecanismos moleculares da hipertrofia&#44; especialmente as cascatas sinalizadoras&#44; s&#227;o ainda pouco claros&#46; Neste contexto colocamos a hip&#243;tese de que a prote&#237;na quinase D &#40;PQD&#41; &#8211; dependente da via da quinase 5 &#40;ERK5&#41; determinada pelo sinal extracelular &#8211;possa regular a jusante o fator intensificador do mi&#243;cito -2D &#40;FIM2D&#41;&#44; afetando as respostas pro-hipertr&#243;ficas &#224; Ang II&#46;</p></span> <span id="abst0030" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0040">M&#233;todos</span><p id="spar0030" class="elsevierStyleSimplePara elsevierViewall">Foram preparados os cardiomi&#243;citos de ratos neonatais de dois a tr&#234;s anos&#44; Sprague-Dawley&#44; tendo sido utilizados os testes de Western blot&#44; a PCR quantitaiva Real-Time &#40;PCRq-RTRT&#41; e a colora&#231;&#227;o por imunofluoresc&#234;ncia para avaliar a ativa&#231;&#227;o e a transloca&#231;&#227;o das mol&#233;culas das vias de sinaliza&#231;&#227;o&#46; O fator natriur&#233;tico auricular &#40;FNA&#41;&#44; o pept&#237;deo natriur&#233;tico auricular tipo B &#40;BNP&#41; e a incorpora&#231;&#227;o &#91;3H&#93;-Leu foram igualmente medidos para determinar a hipertrofia celular&#46;</p></span> <span id="abst0035" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0045">Resultados</span><p id="spar0035" class="elsevierStyleSimplePara elsevierViewall">Nos cardiomi&#243;citos estimulados com Ang II foram observados n&#237;veis elevados de PCD fosforilada &#40;PCD-f&#41; e ERK5 &#40;ERK5-p&#41;&#44; tendo a prote&#237;naquinase C epsilon silenciada apresentado n&#237;veis significativamente inferiores de PQD-f&#46; Al&#233;m disso&#44; a transloca&#231;&#227;o ativada de ERK5 induzida pela Ang II foi mediada pela via PCD&#46; Consequentemente&#44; a inibi&#231;&#227;o de PCD&#603;&#44; de PCD e de ERK5 atrav&#233;s de siRNA atenuou significativamente a ativa&#231;&#227;o de FIM2D induzida pela Ang II&#44; o FNA e a express&#227;o de mRNA BNP&#44; bem como a incorpora&#231;&#227;o de Leucina-&#91;3H&#93;&#46;</p></span> <span id="abst0040" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0050">Conclus&#245;es</span><p id="spar0040" class="elsevierStyleSimplePara elsevierViewall">O nosso estudo demonstra pela primeira vez que as vias PCC&#603;&#47;PCD&#47;ERK5&#47;FIM 2D desempenham um papel importante na resposta hipertr&#243;fica dos cardiomi&#243;citos a Ang II&#46;</p></span>"
        "secciones" => array:4 [
          0 => array:2 [
            "identificador" => "abst0025"
            "titulo" => "Objetivos"
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          1 => array:2 [
            "identificador" => "abst0030"
            "titulo" => "M&#233;todos"
          ]
          2 => array:2 [
            "identificador" => "abst0035"
            "titulo" => "Resultados"
          ]
          3 => array:2 [
            "identificador" => "abst0040"
            "titulo" => "Conclus&#245;es"
          ]
        ]
      ]
    ]
    "NotaPie" => array:1 [
      0 => array:3 [
        "etiqueta" => "1"
        "nota" => "<p class="elsevierStyleNotepara" id="npar0005">These authors contributed equally to this work&#46;</p>"
        "identificador" => "fn0005"
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    ]
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          "en" => "<p id="spar0045" class="elsevierStyleSimplePara elsevierViewall">Angiotensin II &#40;Ang II&#41; stimulates PKC&#603;-dependent PKD phosphorylation in cardiomyocytes&#46; &#40;A&#41; Cardiomyocytes were stimulated with Ang II for various times&#46; Phosphorylated PKD &#40;p-PKD&#41; protein levels were examined using Western blotting and normalized to the total levels of PKD&#46; Ang II &#40;100 nM&#44; 0 min&#41; was used as the control&#46; Data are shown as mean &#177; standard error of the mean &#40;SEM&#41; of four separate experiments&#46; &#42;p&#60;0&#46;05 vs&#46; controls&#59; &#40;B&#41; cells were treated without or with Ang II &#40;100 nM&#41; and in the absence or presence of PKC&#603; siRNA&#46; Western blots &#40;n&#61;4&#41; showed the phosphorylation of PKD and expression levels of PKC&#603; and &#946;-actin&#46; Data are shown as mean &#177; SEM&#46; &#42;p&#60;0&#46;05 vs&#46; control siRNA&#43; Ang II&#40;-&#41;&#59; &#35;p&#60;0&#46;05 vs&#46; control siRNA&#43;Ang II&#40;&#43;&#41;&#46;</p>"
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          "en" => "<p id="spar0050" class="elsevierStyleSimplePara elsevierViewall">PKD specifically mediates angiotensin II &#40;Ang II&#41;-induced ERK5 phosphorylation&#46; Cardiomyocytes were transfected with control or PKD small interfering RNA &#40;siRNA&#41;&#44; and then stimulated with Ang II&#46; Phosphorylated ERK5 protein levels were examined using Western blotting and normalized to the total levels of ERK5&#46; Data are shown as mean &#177; standard error of the mean of four separate experiments&#46; &#42;p&#60;0&#46;05 vs&#46; control siRNA&#43; Ang II&#40;-&#41;&#59; &#35;p&#60;0&#46;05 vs&#46; control siRNA&#43;Ang II&#40;&#43;&#41;&#46;</p>"
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          "en" => "<p id="spar0055" class="elsevierStyleSimplePara elsevierViewall">PKD specifically mediates angiotensin II &#40;Ang II&#41;-induced ERK5 translocation&#46; &#40;A&#41; Immunofluorescence staining for ERK5&#44; green &#40;magnification 40&#215;&#41;&#44; scale bar 50 &#956;m&#46; Cardiomyocytes were transfected with control or PKD small interfering RNA &#40;siRNA&#41;&#44; and then stimulated with Ang II for 15 min&#46; The representative images of fluorescence showed the subcellular localization of the proteins &#40;n&#61;4&#41;&#59; &#40;B&#41; Western blot and quantitative analysis of p-ERK5 expression between the nucleus and cytoplasm due to Ang II &#40;100 nM&#44; 15 min&#41; stimulation&#46; Data are shown as the mean &#177; standard error of the mean of four separate experiments&#46; &#42;p&#60;0&#46;05 vs&#46; control siRNA&#43; Ang II&#40;-&#41;&#59; &#35;p&#60;0&#46;05 vs&#46; control siRNA&#43;Ang II&#40;&#43;&#41;&#46;</p>"
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          "en" => "<p id="spar0060" class="elsevierStyleSimplePara elsevierViewall">The PKC&#603;&#47;PKD&#47;ERK5 pathway is involved in angiotensin II &#40;Ang II&#41;-induced MEF2D activation&#46; &#40;A&#41; Cardiomyocytes were stimulated with Ang II for different times &#40;0-60 min&#41;&#46; Phosphorylated MEF2D protein levels were examined using Western blotting and normalized to the total levels of MEF2D&#46; Data are shown as the mean &#177; standard error of the mean of four separate experiments&#46; &#42;p&#60;0&#46;05 vs&#46; control without Ang II stimulation&#59; &#40;B&#41; cardiomyocytes were treated without or with Ang II &#40;100 nM&#41; and in the absence or presence of PKC&#603;&#44; PKD or ERK5 small interfering RNA &#40;siRNA&#41;&#46; &#42;p&#60;0&#46;05 vs&#46; control siRNA&#43; Ang II&#40;-&#41;&#59; &#35;p&#60;0&#46;05 vs&#46; control siRNA&#43;Ang II&#40;&#43;&#41;&#46;</p>"
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          "en" => "<p id="spar0065" class="elsevierStyleSimplePara elsevierViewall">The PKC&#603;&#47;PKD&#47;ERK5 pathway is involved in angiotensin II &#40;Ang II&#41;-induced expression of ANP and BNP mRNA&#46; Cardiomyocytes were treated without or with Ang II &#40;100 nM&#41; and in the absence or presence of PKC&#603;&#44; PKD or ERK5 small interfering RNA &#40;siRNA&#41;&#46; ANP and BNP mRNA levels were examined using real-time quantitative polymerase chain reaction and normalized to GAPDH levels&#46; Data are shown as mean &#177; standard error of the mean of four separate experiments&#46; &#42;p&#60;0&#46;05 vs&#46; control &#40;Ang II 0 min&#41;&#59; &#35;p&#60;0&#46;05 vs&#46; control siRNA&#46;</p>"
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          "en" => "<p id="spar0070" class="elsevierStyleSimplePara elsevierViewall">The PKC&#603;&#47;PKD&#47;ERK5 pathway is implicated in angiotensin II &#40;Ang II&#41;-induced cardiomyocyte hypertrophy&#46; &#40;A&#41; Immunostaining for a cardiomyocyte marker &#40;&#945;-actinin&#41;&#59; &#40;B-D&#41; cardiomyocytes were treated without or with Ang II &#40;100 nM&#41; and in the absence or presence of PKC&#603; or PKD or ERK5 siRNA&#46; Microscopy of myocardial cells &#40;B&#41; and &#91;3H&#93;-leucine uptake in cells were analyzed &#40;C&#41;&#44; cell size was also detected &#40;D&#41; &#40;n&#61;4&#41;&#46; Scale bar 50 &#956;m&#46; Data are shown as the mean &#177; standard error of the mean&#46; &#42;p&#60;0&#46;05 vs&#46; control siRNA &#43;Ang II&#40;-&#41;&#59; &#35;p&#60;0&#46;05 vs&#46; control small interfering RNA &#40;siRNA&#41; &#43;Ang II&#40;&#43;&#41;&#59; &#43;p&#60;0&#46;05 vs&#46; control &#40;Ang II 0 min&#41;&#59; &#43;&#43;p&#60;0&#46;05 vs&#46; control siRNA&#46;</p>"
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    "bibliografia" => array:2 [
      "titulo" => "References"
      "seccion" => array:1 [
        0 => array:2 [
          "identificador" => "bibs0015"
          "bibliografiaReferencia" => array:35 [
            0 => array:3 [
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              "etiqueta" => "1"
              "referencia" => array:1 [
                0 => array:2 [
                  "contribucion" => array:1 [
                    0 => array:2 [
                      "titulo" => "ERK&#58; a key player in the pathophysiology of cardiac hypertrophy"
                      "autores" => array:1 [
                        0 => array:2 [
                          "etal" => true
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                            1 => "A&#46; Vitacolonna"
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                          ]
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            ]
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                        0 => array:2 [
                          "etal" => true
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            2 => array:3 [
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                      "titulo" => "mTOR&#44; cardiomyocytes and inflammation in cardiac hypertrophy"
                      "autores" => array:1 [
                        0 => array:2 [
                          "etal" => false
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                            0 => "L&#46; Xu"
                            1 => "M&#46; Brink"
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              "etiqueta" => "4"
              "referencia" => array:1 [
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                      "autores" => array:1 [
                        0 => array:2 [
                          "etal" => false
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                            0 => "B&#46;M&#46; Wood"
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                  "host" => array:1 [
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                      "autores" => array:1 [
                        0 => array:2 [
                          "etal" => false
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                          ]
                        ]
                      ]
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                  ]
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                  "contribucion" => array:1 [
                    0 => array:2 [
                      "titulo" => "Small heat shock protein 20 &#40;Hsp20&#41; facilitates nuclear import of protein kinase D 1 &#40;PKD1&#41; during cardiac hypertrophy"
                      "autores" => array:1 [
                        0 => array:2 [
                          "etal" => true
                          "autores" => array:3 [
                            0 => "Y&#46;Y&#46; Sin"
                            1 => "T&#46;P&#46; Martin"
                            2 => "L&#46; Wills"
                          ]
                        ]
                      ]
                    ]
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                  "host" => array:1 [
                    0 => array:2 [
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                        "paginaInicial" => "16"
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Original Article
Protein kinase D participates in cardiomyocyte hypertrophy by regulating extracellular signal-regulated and myocyte enhancer factor 2D
A proteína quinase D interfere na hipertrofia dos cardiomiócitos ao regular a quinase 5 reguladora do sinal extracelular e o fator 2D intensificador dos miócitos
Haitao Yuan1, Qian Xiang1, Le Yang, Jing Geng
Autor para correspondência
geng_jing@126.com

Corresponding author.
Department of Cardiology, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong 250021, PR China
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    "textoCompleto" => "<span class="elsevierStyleSections"><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0065">Introduction</span><p id="par0005" class="elsevierStylePara elsevierViewall">The onset of heart failure is typically preceded by cardiac hypertrophy&#44; a response of the heart to increased workload&#44; a cardiac insult such as a heart attack&#44; or a genetic mutation&#46; Hypertrophy initially develops as an adaptive response to physiological and pathological stimuli&#44; but pathological hypertrophy generally progresses to heart failure&#46; Cardiac hypertrophy is usually characterized by cardiomyocyte hypertrophy and thickening of ventricular walls&#46;<a class="elsevierStyleCrossRefs" href="#bib0180"><span class="elsevierStyleSup">1&#44;2</span></a> Although treating various pathways and targets has been reported to be effective&#44; pathological cardiac hypertrophy inevitably leads to the unfavorable outcomes of heart failure&#46;<a class="elsevierStyleCrossRefs" href="#bib0190"><span class="elsevierStyleSup">3&#44;4</span></a> It is therefore important to find novel therapeutic targets for hypertrophy&#46;</p><p id="par0010" class="elsevierStylePara elsevierViewall">Protein kinase D &#40;PKD&#41; has unique structural&#44; enzymatic and regulatory properties that are different from those of the PKC family members&#46; In unstimulated cells&#44; PKD is in a state of low catalytic kinase activity&#46; In response to cellular stimuli&#44; it is converted into a form with high catalytic activity via phosphorylation at Ser744&#47;748 in the activation loop of the PKD catalytic domain as well as the autophosphorylation of Ser916&#46; PKD has been best characterized for its role in regulating myocardial contraction&#44; cardiac hypertrophy and remodeling&#46;<a class="elsevierStyleCrossRefs" href="#bib0200"><span class="elsevierStyleSup">5&#44;6</span></a> PKD is a typical histone deacetylase 5 &#40;HDAC5&#41; kinase and thus more relevant to HDAC5-myocyte enhancer factor 2 &#40;MEF2&#41; hypertrophic signaling&#46;<a class="elsevierStyleCrossRef" href="#bib0210"><span class="elsevierStyleSup">7</span></a> Mice with PKD ablation show substantial resistance to cardiac hypertrophy&#46;<a class="elsevierStyleCrossRef" href="#bib0215"><span class="elsevierStyleSup">8</span></a></p><p id="par0015" class="elsevierStylePara elsevierViewall">Recent studies have implicated extracellular signal-regulated protein kinase 5 &#40;ERK5&#41; as a potential signal transducer for cardiac hypertrophy&#46;<a class="elsevierStyleCrossRef" href="#bib0220"><span class="elsevierStyleSup">9</span></a> Activated ERK5 transfers from cytoplasm to nucleus&#44; where it exhibits transcriptional regulatory activity by phosphorylating MEF2&#46;<a class="elsevierStyleCrossRef" href="#bib0225"><span class="elsevierStyleSup">10</span></a> Notably&#44; the transcription factor MEF2 promotes cardiac hypertrophy in transgenic mice&#44; while targeted deletion of this kinase attenuates the hypertrophic response mediated by MEF2 activation in vivo&#46;<a class="elsevierStyleCrossRefs" href="#bib0230"><span class="elsevierStyleSup">11&#44;12</span></a> Our previous studies have indicated that protein kinase C epsilon &#40;PKC&#603;&#41;-dependent ERK5 activation and nuclear translocation is involved in cardiomyocyte hypertrophy induced by angiotensin II &#40;Ang II&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0240"><span class="elsevierStyleSup">13</span></a></p><p id="par0020" class="elsevierStylePara elsevierViewall">The aim of this study was to determine the potential role of PKD in Ang II-mediated cardiomyocyte hypertrophy&#46; The results presented here demonstrate that Ang II rapidly induces activation of PKD via PKC&#603;&#44; which subsequently leads to ERK5-activated translocation&#44; myocyte enhancer factor 2D &#40;MEF2D&#41; transcriptional activation&#44; and cardiomyocyte hypertrophy&#46; Based on our findings&#44; we suggest that the PKC&#603;&#47;PKD&#47;ERK5&#47;MEF2D pathway is implicated in Ang II-induced cardiomyocyte hypertrophy&#46;</p></span><span id="sec0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0070">Methods</span><span id="sec0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0075">Materials</span><p id="par0025" class="elsevierStylePara elsevierViewall">All basic laboratory reagents and Ang II were obtained from Sigma-Aldrich &#40;St&#46; Louis&#44; MO&#41;&#46; Nuclear and cytoplasmic protein extraction reagents were purchased from Thermo Fisher Scientific &#40;Waltham&#44; MA&#41;&#46; Antibodies against &#946;-actin and lamin B1 were purchased from Proteintech Group Inc&#46; &#40;Rosemont&#44; IL&#41;&#46; Antibodies against PKD&#44; MEF2D&#44; phospho-PKD744&#47;748&#44; phospho-PKD916&#44; and phospho-MEF2D were obtained from Cell Signaling Technology &#40;Cambridge&#44; MA&#41;&#59; antibodies against PKC&#603;&#44; ERK5&#44; and phospho-ERK5 from Cayman Chemicals &#40;Ann Arbor&#44; MI&#41;&#44; SDS-polyacrylamide gels from Pierce &#40;Rockford&#44; IL&#41;&#44; and PVDF and proteingel apparatus from Bio-Rad &#40;Hercules&#44; CA&#41;&#46; Minimal essential medium &#40;MEM&#41;&#44; fetal bovine serum&#44; phosphate buffered saline &#40;PBS&#41;&#44; penicillin&#47;streptomycin&#44; non-essential amino acids&#44; and <span class="elsevierStyleSmallCaps">l</span>-glutamine were obtained from Sigma-Aldrich &#40;St&#46; Louis&#44; MO&#41;&#46;</p></span><span id="sec0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0080">Cell cultures</span><p id="par0030" class="elsevierStylePara elsevierViewall">Animals used in these experiments were handled in accordance with the Guiding Principles in the Care and Use of Animals&#44; approved by the experimental animal ethics committee of Shandong Provincial Hospital Affiliated to Shandong First Medical University&#46; Neonatal rat cardiomyocytes from 2- to 3-day-old Sprague-Dawley rats were prepared as previously described&#46;<a class="elsevierStyleCrossRef" href="#bib0355"><span class="elsevierStyleSup">14</span></a> Briefly&#44; cells were obtained by trypsinization after gentle mechanical disruption and grown in MEM &#40;5 ml penicillin&#47;streptomycin&#44; 5 ml non-essential amino acids&#44; 5 ml <span class="elsevierStyleSmallCaps">l</span>-glutamine and 10&#37; FBS in 500 ml of MEM&#41; at 37<span class="elsevierStyleHsp" style=""></span>&#176;C and 5&#37; CO<span class="elsevierStyleInf">2</span>&#46; Cardiomyocytes were cultured as monolayers at 5&#215;10<span class="elsevierStyleSup">4</span> cells&#47;cm<span class="elsevierStyleSup">2</span> and incubated with Ang II at different times and various dosages&#46; Prior to stimulation&#44; all cells were placed in serum-reduced medium &#40;0&#46;1&#37; FBS&#41; for 24 h to maintain quiescence&#46;</p></span><span id="sec0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0085">Nuclear and cytoplasmic fractionation</span><p id="par0035" class="elsevierStylePara elsevierViewall">Nuclear and cytoplasmic protein extraction reagents were used according to the manufacturer&#39;s instructions&#46; Cells were washed with cold PBS&#44; suspended in ice-cold buffer F &#40;210 mM mannitol&#44; 70 mM sucrose&#44; 5 mM Tris&#44; pH 7&#46;5&#44; 1 mM EDTA&#44; supplemented with protease inhibitors&#41;&#44; left in the buffer for 15 min on ice and then Dounce homogenized &#40;15 strokes&#41;&#46; The nuclei were separated by centrifugation &#40;500 <span class="elsevierStyleItalic">g</span>&#44; 5 min&#44; 4<span class="elsevierStyleHsp" style=""></span>&#176;C&#41;&#46; The supernatant containing the cytosolic fraction was boiled in sample buffer&#46; The pellet containing the nuclei was washed with PBS and then resuspended in RIPA buffer for 5 min on ice&#44; centrifuged again and the supernatant &#40;nuclear fraction&#41; was boiled in sample buffer&#46; The same volumes of nuclear and cytosolic fractions were analyzed&#46;</p></span><span id="sec0030" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0090">Western blot analysis</span><p id="par0040" class="elsevierStylePara elsevierViewall">Cardiomyocytes were lysed in ice-cold lysis buffer &#40;150 mM NaCl&#44; 5 mM MgCl<span class="elsevierStyleInf">2</span>&#44; 1 mM phenylmethylsulfonyl fluoride&#44; 1 mM dithiothreitol&#44; 1 mM sodium orthovanadate&#44; 1 mM sodium phosphate&#44; 1&#37; Triton X-100&#44; 0&#46;5&#37; SDS&#44; 10 &#956;g&#47;ml aprotinin&#44; 10 &#956;g&#47;ml leupetin&#44; 50 mM HEPES&#44; pH 7&#46;5&#41;&#46; Crude lysates were sonicated and centrifuged at 10 000 rpm for 5 min at 4<span class="elsevierStyleHsp" style=""></span>&#176;C&#46; Total protein concentration from the resulting supernatant was determined by bicinchoninic acid protein assay &#40;Pierce&#44; Rockford&#44; IL&#41; and normalized to 1 mg&#47;ml&#46; Aliquots of whole cell lysates were dried in a SpeedVac Concentrator &#40;Savant&#44; Holbrook&#44; NY&#41;&#44; denatured in Laemmli sample buffer&#44; and stored at -20<span class="elsevierStyleHsp" style=""></span>&#176;C until use&#46; Samples were boiled for 10 min&#44; and 30 &#956;g protein per lane was resolved on SDS-PAGE before being transferred to PVDF membranes&#46; Membranes were incubated at 4<span class="elsevierStyleHsp" style=""></span>&#176;C overnight with appropriate primary antibodies &#40;rabbit polyclonal anti-PKD&#44; anti-p-PKD&#44; anti-MEF2D&#44; anti-phosphorylated MEF2D diluted 1&#58;1000 &#40;Cell Signaling Technology &#91;Cambridge&#44; MA&#93;&#41;&#44; and anti-ERK5&#44; anti-phosphorylated ERK5 &#40;p-ERK5&#41; diluted 1&#58;800 &#40;Cayman Chemicals&#44; Ann Arbor&#41;&#46; After washing&#44; the membrane was incubated with the corresponding horseradish peroxidase-conjugated secondary antibody&#46; Immunoreactive bands were visualized with the SuperSignal West Pico enhanced chemiluminescence kit &#40;Pierce&#44; Rockford&#44; IL&#41; according to the manufacturer&#39;s instructions&#46; Densitometric quantification was performed using Image-Pro Plus software with &#946;-actin&#44; lamin B1&#44; PKD&#44; ERK5&#44; or MEF2D for normalization&#46;</p></span><span id="sec0035" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0095">Immunofluorescence staining</span><p id="par0045" class="elsevierStylePara elsevierViewall">Cells cultured on glass coverslips were washed with PBS and fixed in 2&#37; paraformaldehyde for 30 min at room temperature&#44; followed by two rinses in PBS&#46; Monolayers were then permeabilized three times for 10 min each&#44; with PBS supplemented with 0&#46;1&#37; &#40;final concentration&#41; Triton X-100 and then blocked twice in PBS with 0&#46;2&#37; BSA for 10 min each at room temperature&#46; Cells were incubated with 1&#47;100 anti-phospho-ERK5 or anti-&#945;-actinin &#40;69758S&#44; Cell Signaling Technology &#91;Cambridge&#44; MA&#93;&#41; in blocking solution overnight at 4<span class="elsevierStyleHsp" style=""></span>&#176;C&#46; Coverslips incubated with rabbit polyclonal IgG&#44; instead of primary antiserum&#44; served as negative controls&#46; After three washes for 10 min each in PBS with 0&#46;2&#37; BSA&#44; coverslips were incubated with goat-anti-rabbit secondary antibody for 30 min and washed three times in PBS with 0&#46;2&#37; BSA&#46; Immunolabeled cells were counterstained with DAPI to detect cell nuclei&#44; then the slides were mounted&#46; Samples were analyzed by confocal immunofluorescence microscopy with a Zeiss LSM 510 system&#46; To avoid interference between fluorescence signals&#44; images were captured in multitracking mode&#46;</p></span><span id="sec0040" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0100">Real-time quantitative polymerase chain reaction</span><p id="par0050" class="elsevierStylePara elsevierViewall">Real-time quantitative polymerase chain reaction &#40;PCR&#41; was used to measure the mRNA levels of atrial natriuretic peptide &#40;ANP&#41; and brain natriuretic peptide &#40;BNP&#41;&#44; which are biomarkers of cardiac hypertrophy&#44; using a SYBR Green PCR kit &#40;Qiagen&#44; Inc&#46;&#44; Valencia&#44; CA&#41;&#44; according to the manufacturer&#39;s protocol&#46; The following primers were used for real-time PCR&#58; 5&#8242;-CGT ATA CAG TGC GGT GTC CA-3&#8242; and 5&#8242;-GGT TGA CTT CCC CAG TCC AG-3&#8242; for ANP&#59; 5&#8242;-AGC TGC TGG AGC TGA TAA GAG-3&#8242; and 5&#8242;-CTG CCC AAA GCA GCT TGA AC-3&#8242; for BNP&#59; and 5&#8242;-AAG AAG GTG GTG AAG CAG GC-3&#8242; and 5&#8242;-TCC ACC ACC CTG TTG CTG TA-3&#8242; for GAPDH&#46; Amplification and detection were performed with the ABI 7500 Sequence Detection System &#40;Applied Biosystems&#44; Foster City&#44; CA&#41;&#46; The final real-time PCR analysis results are presented as the ratio of the mRNA of interest to that of GAPDH&#44; which was used as an internal control&#46; The relative mRNA levels were calculated using the 2<span class="elsevierStyleSup">-&#9651;&#9651;Ct</span> method&#46;</p></span><span id="sec0045" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0105">Small interfering RNA and its transfection</span><p id="par0055" class="elsevierStylePara elsevierViewall">The PKC&#603;-specific small interfering RNA &#40;siRNA&#41; sequences used were as follows&#58; &#35;1&#44; 5&#8242;-AAGATCGAGCTGGCTGTCTTT-3&#8242;&#59; &#35;2&#44; 5&#8242;-TTCTAGCTCGACCGACAGAAA-3&#8242;&#59; PKD&#58; &#35;1&#44; 5&#8242;-GGAGGGCGAUCUUAUUGAATT- 3&#8242;&#59; &#35;2&#44; 5&#8242;-CAGCAAACGUAGUGUAUUATT-3&#8242;&#59; &#35;3&#44; 5&#8242;-CGCUAUAUUACCCAUGAAATT-3&#8242;&#59; ERK5&#58; &#35;1&#44; 5&#8242;-CAUGAACCCUGCCGAUAUUUU-3&#8242;&#59; &#35;2&#44; 5&#8242;-AAACCAGUCUUUCGACAUGUU-3&#8242;&#59; &#35;3&#44; 5&#8242;-GAACUGUGAGCUCAAGAUUUU-3&#8242;&#46; They were obtained from Genepharma &#40;Shanghai&#44; China&#41;&#46; Proliferating cells were removed by trypsinization&#44; seeded into 60-mm dishes&#44; and incubated for 24 h until they reached 60&#37; confluence&#46; Transfection of cardiomyocytes was achieved using Lipofectamine 2000 &#40;Invitrogen&#41; according to the manufacturer&#39;s protocol&#44; with 100 nM non-targeting control siRNA or SMART pool siRNA for PKC&#603;&#44; PKD and ERK5&#46; After 48 h&#44; cells were exposed to Ang II as indicated&#44; and lysates underwent Western blot analysis&#46;</p></span><span id="sec0050" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0110">Measurement of cell diameter and &#91;3H&#93;-leucine incorporation</span><p id="par0060" class="elsevierStylePara elsevierViewall">To determine cell hypertrophy&#44; cell diameter and &#91;3H&#93;-leucine &#40;Leu&#41; incorporation were measured&#46; After being digested&#44; centrifuged and resuspended in MEM&#44; cells were counted in at least three dishes at each time point by phase-contrast microscopy&#46; Cell diameter was measured using a digital photography analysis system&#46; Ten fields were randomly chosen for each group&#44; and 10 cardiomyocytes were determined for each field&#46;</p><p id="par0065" class="elsevierStylePara elsevierViewall">&#91;3H&#93;-Leu incorporation in cardiomyocytes was assessed as described previously&#46; Cardiomyocytes were made quiescent by incubation in serum-free MEM for 24 h&#46; Cells were incubated with 1 &#956;Ci&#47;ml &#91;3H&#93;-Leu in the presence or absence of 100 nM Ang II&#46; After 24 h&#44; cells were washed twice with ice-cold PBS&#44; and the proteins were precipitated in 5&#37; trichloroacetic acid&#46; &#91;3H&#93;-Leu incorporation was determined using a scintillation counter&#46;</p></span><span id="sec0055" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0115">Statistical analysis</span><p id="par0070" class="elsevierStylePara elsevierViewall">The experimental results are expressed as the mean &#177; standard error of the mean of three or more independent experiments and analyzed by one-way ANOVA with post-hoc comparisons using the LSD test&#46; All statistical analyses were performed using IBM SPSS 22&#46;0 statistical software &#40;IBM SPSS&#44; Inc&#46;&#44; Chicago&#44; IL&#41;&#46; A p-value of &#60;0&#46;05 was considered statistically significant&#46;</p></span></span><span id="sec0060" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0120">Results</span><span id="sec0065" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0125">Angiotensin II induces PKC&#603;-dependent PKD phosphorylation in cardiomyocytes</span><p id="par0075" class="elsevierStylePara elsevierViewall">In accordance with our previous experiments&#44; we selected a concentration of 100 nm of Ang II&#46;<a class="elsevierStyleCrossRef" href="#bib0240"><span class="elsevierStyleSup">13</span></a> Ang II &#40;100 nmol&#47;l&#41; rapidly induced phosphorylation of PKD&#44; within 5 min&#44; with peak phosphorylation between 15 and 30 min&#44; returning to baseline after 60 min &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Figure 1</a>A&#41;&#44; which resembles the pattern of ERK5 phosphorylation in our previous experiments&#46;<a class="elsevierStyleCrossRef" href="#bib0240"><span class="elsevierStyleSup">13</span></a> During the course of Ang II stimulation&#44; there was no obvious change in PKD expression&#44; and &#946;-actin levels showed equal loading in each sample&#46; PKC&#603;-specific siRNA significantly inhibited Ang II-induced activation of PKD &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Figure 1</a>B&#41;&#46;</p><elsevierMultimedia ident="fig0005"></elsevierMultimedia></span><span id="sec0070" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0130">Knockdown of PKD by siRNA inhibited Ang II-induced activation of ERK5 in cardiomyocytes</span><p id="par0080" class="elsevierStylePara elsevierViewall">To gain insight into the functional significance of PKD activation in Ang II-mediated signaling events&#44; we determined whether knockdown of endogenous PKD in cardiomyocytes using siRNA affects Ang II-mediated ERK5 activation&#46; Cardiomyocytes were transfected with PKD siRNA for 48 h and then stimulated with Ang II for the time indicated&#46; Treatment of cardiomyocytes with PKD siRNA significantly reduced endogenous PKD expression&#44; whereas control siRNA had no effect&#46; PKD siRNA specifically targeted PKD since expression of &#946;-actin and ERK5 was not changed&#46; Decreasing PKD expression by its siRNA significantly inhibited Ang II-induced ERK5 activation in cardiomyocytes &#40;<a class="elsevierStyleCrossRef" href="#fig0010">Figure 2</a>&#41;&#46;</p><elsevierMultimedia ident="fig0010"></elsevierMultimedia></span><span id="sec0075" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0135">Angiotensin II stimulates ERK5 translocation via the PKC&#603;&#47;PKD-dependent pathway</span><p id="par0085" class="elsevierStylePara elsevierViewall">Our previous studies showed that ERK5 was located primarily in the cytoplasm of cardiomyocytes before stimulation&#59; nuclear entry was seen at 5 min after Ang II stimulation&#59; marked translocation from the cytoplasm to the nucleus was observed by 15 min after addition of Ang II&#59; and after 60 min of Ang II treatment&#44; ERK5 was gradually shuttled back to the cytoplasm&#46;<a class="elsevierStyleCrossRef" href="#bib0240"><span class="elsevierStyleSup">13</span></a> To gain further insights into the signaling pathways leading to Ang II-induced translocation of ERK5&#44; we studied the effects of PKD&#46; Knocking down PKD expression by siRNA greatly attenuated Ang II-induced translocation of ERK5 in cardiomyocytes &#40;<a class="elsevierStyleCrossRef" href="#fig0015">Figure 3</a>A&#41;&#46;</p><elsevierMultimedia ident="fig0015"></elsevierMultimedia><p id="par0090" class="elsevierStylePara elsevierViewall">We also demonstrated changes in the proportion of p-ERK5 content between the nucleus and cytoplasm&#46; We found an increase in nuclear content of p-ERK5 and a concomitant decrease in cytoplasmic content under Ang II stimulation&#46; Silencing PKD by siRNA significantly reduced the expression of ERK5 in the nucleus &#40;<a class="elsevierStyleCrossRef" href="#fig0015">Figure 3</a>B&#41;&#46;</p><p id="par0095" class="elsevierStylePara elsevierViewall">Our previous studies confirmed that PKC&#603;-mediated ERK5 translocation was involved in cardiomyocyte hypertrophy due to Ang II&#46;<a class="elsevierStyleCrossRef" href="#bib0240"><span class="elsevierStyleSup">13</span></a> Taken together&#44; these results suggest that the PKC&#603;&#47;PKD pathway plays a part in the nucleocytoplasmic traffic of ERK5 in cardiomyocytes&#46;</p></span><span id="sec0080" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0140">The PKC&#603;&#47;PKD&#47;ERK5 pathway is involved in angiotensin II-induced activation of MEF2D</span><p id="par0100" class="elsevierStylePara elsevierViewall">To determine whether the PKC&#603;&#47;PKD&#47;ERK5 pathway plays an important role in Ang II-induced phosphorylation of MEF2D in cardiomyocytes&#44; we examined the effect of PKC&#603;&#44; PKD and ERK5 siRNA on Ang II-induced MEF2D activation&#46; Ang II induced phosphorylation of MEF2D after 5 min&#44; with peak phosphorylation at 15 min&#44; returning to baseline levels by 30 min &#40;p&#60;0&#46;05&#41; &#40;<a class="elsevierStyleCrossRef" href="#fig0020">Figure 4</a>A&#41;&#46; Knocking down PKC&#603;&#44; PKD and ERK5 expression by siRNA all significantly attenuated activation of MEF2D &#40;<a class="elsevierStyleCrossRef" href="#fig0020">Figure 4</a>B&#41;&#46;</p><elsevierMultimedia ident="fig0020"></elsevierMultimedia></span><span id="sec0085" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0145">The PKC&#603;&#47;PKD&#47;ERK5 pathway is involved in angiotensin II-induced expression of ANP and BNP mRNA</span><p id="par0105" class="elsevierStylePara elsevierViewall">As the targets of MEF2D&#44; ANP and BNP are biomarkers of cardiac hypertrophy&#46; Compared with controls&#44; Ang II significantly increased the mRNA expression of ANP and BNP&#44; while PKC&#603;&#44; PKD and ERK5 siRNA treatment attenuated these increases &#40;<a class="elsevierStyleCrossRef" href="#fig0025">Figure 5</a>&#41;&#46;</p><elsevierMultimedia ident="fig0025"></elsevierMultimedia></span><span id="sec0090" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0150">The PKC&#603;&#47;PKD&#47;ERK5 pathway is implicated in angiotensin II-stimulated cardiomyocyte hypertrophy</span><p id="par0110" class="elsevierStylePara elsevierViewall">Both &#91;3H&#93;-Leu incorporation and cell size were significantly greater in Ang II-treated &#40;100 nM&#41; cells than in controls &#40;p&#60;0&#46;05&#41;&#46; Immunostaining for a cardiomyocyte marker &#40;&#945;-actinin&#41; is included to attest the purity of the primary cultures &#40;<a class="elsevierStyleCrossRef" href="#fig0030">Figure 6</a>A&#41;&#46; Previous studies confirmed that the PKC&#603;&#47;ERK5 pathway participates in Ang II-induced cardiomyocyte hypertrophy&#46; In this study&#44; we confirmed the involvement of PKD in this process&#46; As shown in <a class="elsevierStyleCrossRef" href="#fig0030">Figure 6</a>B and C&#44; Ang II promotes cardiomyocyte hypertrophy&#44; while PKC&#603;&#44; PKD and ERK5 siRNA greatly inhibited hypertrophy&#46; PKD siRNA strongly suppressed Ang II-induced &#91;3H&#93;-Leu incorporation &#40;p&#60;0&#46;05&#41;&#46; Moreover&#44; Ang II treatment increased the cell size of cardiomyocytes&#44; whereas PKC&#603;&#44; PKD and ERK5 siRNA markedly decreased cell size &#40;<a class="elsevierStyleCrossRef" href="#fig0030">Figure 6</a>D&#41;&#46; These results suggest that the PKC&#603;&#47;PKD&#47;ERK5 pathway plays pivotal roles in Ang II-induced cardiomyocyte hypertrophy&#46;</p><elsevierMultimedia ident="fig0030"></elsevierMultimedia></span></span><span id="sec0095" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0155">Discussion</span><p id="par0115" class="elsevierStylePara elsevierViewall">Cardiac hypertrophy is an adaptive and compensatory mechanism preserving cardiac output during hypertension&#46; Nevertheless&#44; long-term stimuli incite chronic hypertrophy and may lead to heart failure&#46; Inappropriate activation of the renin-angiotensin-aldosterone system &#40;RAAS&#41; plays an important role in this process&#46; Ang II&#44; the main effector of the RAAS&#44; is increased in patients and animal models of hypertension and cardiac hypertrophy&#46; Ang II can induce cardiomyocyte hypertrophy in vitro&#46; A large number of intracellular pathways have been associated with this hypertrophic response&#46;<a class="elsevierStyleCrossRef" href="#bib0360"><span class="elsevierStyleSup">15</span></a> These pathways are intertwined&#44; generating a complex response that is still not completely understood&#46; In this study&#44; we provide evidence that PKD activation is one of the early signaling events in cardiomyocytes in response to Ang II&#46;</p><p id="par0120" class="elsevierStylePara elsevierViewall">The experiments presented here were designed to elucidate the underlying mechanisms of cardiomyocyte hypertrophy by Ang II&#46; In the present study&#44; we demonstrated that Ang II stimulated PKD phosphorylation in a time-dependent manner in cardiomyocytes&#46; PKC&#603; is the specific upstream regulator of PKD&#44; and inhibiting PKC&#603; by siRNA reduced PKD activation&#46; Furthermore&#44; PKD is critical in ERK5 phosphorylation and translocation&#44; since silencing PKD by siRNA blocked ERK5 activation and nucleocytoplasmic traffic&#46; Importantly&#44; the PKC&#603;&#47;PKD&#47;ERK5 pathway plays a significant role in MEF2D activation and ANP and BNP mRNA expression&#44; and contributes to Ang II-induced cardiomyocyte hypertrophy&#44; as shown by significantly increased &#91;3H&#93;-Leu incorporation&#46; This is the first report to show the critical role of the PKC&#603;&#47;PKD&#47;ERK5&#47;MEF2D pathway in cardiomyocyte hypertrophy&#44; which may provide new insights into the molecular mechanisms of cardiac remodeling observed in animal models and in humans&#46;</p><p id="par0125" class="elsevierStylePara elsevierViewall">PKC&#603; is activated in response to hypertrophic stimuli in cultured myocytes and in vivo&#59; overexpression and activation of PKC&#603; results in myocardial hypertrophy&#46;<a class="elsevierStyleCrossRef" href="#bib0250"><span class="elsevierStyleSup">16</span></a> Cardiac-specific transgenic mice overexpressing a constitutively active PKC&#603; mutant developed cardiac hypertrophy&#46;<a class="elsevierStyleCrossRef" href="#bib0255"><span class="elsevierStyleSup">17</span></a> Our previous studies found involvement of PKC&#603; in Ang II-induced cardiomyocyte hypertrophy&#46; Knocking down PKC&#603; by specific siRNA strongly blocked Ang II-stimulated activation and translocation of ERK5 as well as &#91;3H&#93;-Leu incorporation in cardiomyocytes&#46;<a class="elsevierStyleCrossRef" href="#bib0240"><span class="elsevierStyleSup">13</span></a></p><p id="par0130" class="elsevierStylePara elsevierViewall">PKD lies downstream of PKCs in a novel signal transduction pathway implicated in the regulation of multiple fundamental biological processes&#46; In recent years&#44; PKD has been implicated as a signal transducer in cardiac hypertrophy&#46;<a class="elsevierStyleCrossRef" href="#bib0260"><span class="elsevierStyleSup">18</span></a> Knockdown of PKD expression with siRNA blunts agonist-dependent hypertrophy&#44; whereas in vivo cardiac-specific expression of constitutively active PKD causes a brief phase of cardiac hypertrophy&#46;<a class="elsevierStyleCrossRef" href="#bib0355"><span class="elsevierStyleSup">14</span></a> Specific cellular processes that appear to be under PKD control include transcriptional factor activation&#46;<a class="elsevierStyleCrossRef" href="#bib0270"><span class="elsevierStyleSup">19</span></a> Activated PKD&#44; perhaps along with other histone deacytelase &#40;HDAC&#41; kinases&#44; primarily promotes MEF2 expression and activation by inducing class II HDAC phosphorylation and nuclear export&#46; A-kinase anchoring protein 13 &#40;AKAP13&#41; has been well documented as a vital component of the MEF2-mediated fetal gene response and the cardiac hypertrophic signaling cascade&#46;<a class="elsevierStyleCrossRefs" href="#bib0275"><span class="elsevierStyleSup">20&#44;21</span></a> AKAP13 binds PKD near the C-terminus of the protein&#44;<a class="elsevierStyleCrossRef" href="#bib0285"><span class="elsevierStyleSup">22</span></a> and upon activation by PKC&#44; PKD dissociates from AKAP13 and phosphorylates HDAC5 in the nucleus&#44; causing dissociation of HDAC5 from MEF2&#46;<a class="elsevierStyleCrossRefs" href="#bib0285"><span class="elsevierStyleSup">22&#44;23</span></a></p><p id="par0135" class="elsevierStylePara elsevierViewall">The MEF2 family has four members&#58; MEF2A&#44; MEF2B&#44; MEF2C and MEF2D&#46; There is increasing evidence that MEF2C and MEF2D both act as hypertrophy mediators&#46; Expression of MEF2C was increased in both cardiomyocytes and human aortic smooth muscle cells &#40;HASMCs&#41; in Ang II-induced hypertrophy&#46;<a class="elsevierStyleCrossRefs" href="#bib0240"><span class="elsevierStyleSup">13&#44;24</span></a> MEF2D-null mice were resistant to cardiac hypertrophy in response to pressure overload and chronic adrenergic stimulation&#46;<a class="elsevierStyleCrossRef" href="#bib0300"><span class="elsevierStyleSup">25</span></a> Our previous studies also confirmed that PKD participates in cardiac hypertrophy by regulating MEF2D in spontaneously hypertensive rats&#46;<a class="elsevierStyleCrossRef" href="#bib0305"><span class="elsevierStyleSup">26</span></a> Consistent with this&#44; our study showed that Ang II induces PKC&#603;&#47;PKD-dependent MEF2D activation and cardiomyocyte hypertrophy&#46; Inhibiting PKC&#603; or PKD by specific siRNA strongly reduced activation of MEF2D&#46;</p><p id="par0140" class="elsevierStylePara elsevierViewall">It has been demonstrated that ERK5 is involved in the development of detrimental hypertrophy in different pathological systems&#46;<a class="elsevierStyleCrossRef" href="#bib0310"><span class="elsevierStyleSup">27</span></a> Mice with cardiomyocyte-specific deletion of ERK5 showed a reduced hypertrophic response during pressure overload&#46;<a class="elsevierStyleCrossRef" href="#bib0315"><span class="elsevierStyleSup">28</span></a> ERK5 is closely associated with the activation of MEF2 transcription factors&#46;<a class="elsevierStyleCrossRef" href="#bib0320"><span class="elsevierStyleSup">29</span></a> In sensory neurons&#44; the ERK5&#47;MEF2D pathway strictly regulates expression of Bcl-w&#44; an anti-apoptopic bcl-2 family member&#44; which promotes sensory neuron survival&#46;<a class="elsevierStyleCrossRef" href="#bib0325"><span class="elsevierStyleSup">30</span></a> A groundbreaking finding revealed that activation of MEF2C&#47;D transcription factors promotes early B-cell development&#44; which depends on their phosphorylation by ERK5&#46;<a class="elsevierStyleCrossRef" href="#bib0330"><span class="elsevierStyleSup">31</span></a> In the present study&#44; we ascertained that Ang II-induced ERK5 phosphorylation resulted in MEF2D activation and subsequent cardiomyocyte hypertrophy&#46; Knocking down ERK5 by siRNA significantly attenuated MEF2D activation and &#91;3H&#93;-Leu incorporation&#46;</p><p id="par0145" class="elsevierStylePara elsevierViewall">The subcellular location of ERK5 was cell type-specific&#46;<a class="elsevierStyleCrossRefs" href="#bib0335"><span class="elsevierStyleSup">32&#44;33</span></a> Recently&#44; a mechanism for the nucleocytoplasmic transport of ERK5 has been proposed&#46; ERK5 has nuclear localizing activity in its C-terminal region&#44; owing to a bipartite nuclear localization signal&#46;<a class="elsevierStyleCrossRefs" href="#bib0340"><span class="elsevierStyleSup">33&#44;34</span></a> In addition&#44; ERK5 has nuclear export activity&#46;<a class="elsevierStyleCrossRef" href="#bib0350"><span class="elsevierStyleSup">35</span></a> The balance between nuclear import and export determines the subcellular localization of ERK5&#46;<a class="elsevierStyleCrossRef" href="#bib0345"><span class="elsevierStyleSup">34</span></a> A previous study showed that ERK5 is mainly cytosolic in quiescent cardiomyocytes&#44; but translocates to the nucleus during activation by Ang II&#46; PKC&#603; is critical for ERK5 nuclear entry&#46;<a class="elsevierStyleCrossRef" href="#bib0240"><span class="elsevierStyleSup">13</span></a></p><p id="par0150" class="elsevierStylePara elsevierViewall">Our previous studies showed that the PKD&#47;ERK5 pathway plays an important role in Ang II-induced hypertrophy of HASMCs&#46;<a class="elsevierStyleCrossRef" href="#bib0295"><span class="elsevierStyleSup">24</span></a> But the effect of PKD on ERK5 in cardiomyocytes was still unclear&#46; Since they have a similar activation pattern and common upstream and downstream molecules&#44; we speculate that PKD plays a critical role in ERK5 phosphorylation and translocation in cardiomyocytes by Ang II&#46; In agreement with this&#44; the present study found that knocking down PKD by siRNA attenuated Ang II-stimulated ERK5 phosphorylation&#44; followed by decreased translocation&#46;</p></span><span id="sec0100" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0160">Conclusion</span><p id="par0155" class="elsevierStylePara elsevierViewall">In summary&#44; we demonstrate for the first time that Ang II induces PKD-dependent ERK5 phosphorylation and translocation in cardiomyocytes&#46; The PKC&#603;&#47;PKD&#47;ERK5 pathway also plays an essential role in Ang II-stimulated MEF2D activation and cardiomyocyte hypertrophy&#46; These results provide new insights into the molecular underpinnings of cardiomyocyte hypertrophy in response to Ang II&#46; These findings may provide novel targets for therapeutic manipulation through pharmacological or genetic approaches to pathological cardiac remodeling in hypertension&#46;</p></span><span id="sec0105" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0165">Conflicts of interest</span><p id="par0160" class="elsevierStylePara elsevierViewall">The authors have no conflicts of interest to declare&#46;</p></span></span>"
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          "identificador" => "xres1483536"
          "titulo" => "Abstract"
          "secciones" => array:4 [
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            2 => array:2 [
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          "titulo" => "Keywords"
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          "titulo" => "Resumo"
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          "titulo" => "Introduction"
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          "titulo" => "Methods"
          "secciones" => array:9 [
            0 => array:2 [
              "identificador" => "sec0015"
              "titulo" => "Materials"
            ]
            1 => array:2 [
              "identificador" => "sec0020"
              "titulo" => "Cell cultures"
            ]
            2 => array:2 [
              "identificador" => "sec0025"
              "titulo" => "Nuclear and cytoplasmic fractionation"
            ]
            3 => array:2 [
              "identificador" => "sec0030"
              "titulo" => "Western blot analysis"
            ]
            4 => array:2 [
              "identificador" => "sec0035"
              "titulo" => "Immunofluorescence staining"
            ]
            5 => array:2 [
              "identificador" => "sec0040"
              "titulo" => "Real-time quantitative polymerase chain reaction"
            ]
            6 => array:2 [
              "identificador" => "sec0045"
              "titulo" => "Small interfering RNA and its transfection"
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            7 => array:2 [
              "identificador" => "sec0050"
              "titulo" => "Measurement of cell diameter and &#91;3H&#93;-leucine incorporation"
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              "identificador" => "sec0055"
              "titulo" => "Statistical analysis"
            ]
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          "identificador" => "sec0060"
          "titulo" => "Results"
          "secciones" => array:6 [
            0 => array:2 [
              "identificador" => "sec0065"
              "titulo" => "Angiotensin II induces PKC&#603;-dependent PKD phosphorylation in cardiomyocytes"
            ]
            1 => array:2 [
              "identificador" => "sec0070"
              "titulo" => "Knockdown of PKD by siRNA inhibited Ang II-induced activation of ERK5 in cardiomyocytes"
            ]
            2 => array:2 [
              "identificador" => "sec0075"
              "titulo" => "Angiotensin II stimulates ERK5 translocation via the PKC&#603;&#47;PKD-dependent pathway"
            ]
            3 => array:2 [
              "identificador" => "sec0080"
              "titulo" => "The PKC&#603;&#47;PKD&#47;ERK5 pathway is involved in angiotensin II-induced activation of MEF2D"
            ]
            4 => array:2 [
              "identificador" => "sec0085"
              "titulo" => "The PKC&#603;&#47;PKD&#47;ERK5 pathway is involved in angiotensin II-induced expression of ANP and BNP mRNA"
            ]
            5 => array:2 [
              "identificador" => "sec0090"
              "titulo" => "The PKC&#603;&#47;PKD&#47;ERK5 pathway is implicated in angiotensin II-stimulated cardiomyocyte hypertrophy"
            ]
          ]
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          "identificador" => "sec0095"
          "titulo" => "Discussion"
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          "identificador" => "sec0100"
          "titulo" => "Conclusion"
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          "identificador" => "sec0105"
          "titulo" => "Conflicts of interest"
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        10 => array:2 [
          "identificador" => "xack520702"
          "titulo" => "Acknowledgment"
        ]
        11 => array:1 [
          "titulo" => "References"
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      ]
    ]
    "pdfFichero" => "main.pdf"
    "tienePdf" => true
    "fechaRecibido" => "2020-04-25"
    "fechaAceptado" => "2020-08-17"
    "PalabrasClave" => array:2 [
      "en" => array:1 [
        0 => array:4 [
          "clase" => "keyword"
          "titulo" => "Keywords"
          "identificador" => "xpalclavsec1350703"
          "palabras" => array:6 [
            0 => "Protein kinase C epsilon"
            1 => "Protein kinase D"
            2 => "Extracellular signal-regulated protein kinase 5"
            3 => "Myocyte enhancer factor 2D"
            4 => "Cardiomyocytes"
            5 => "Hypertrophy"
          ]
        ]
      ]
      "pt" => array:1 [
        0 => array:4 [
          "clase" => "keyword"
          "titulo" => "Palavras-chave"
          "identificador" => "xpalclavsec1350704"
          "palabras" => array:6 [
            0 => "Prote&#237;na quinase C"
            1 => "Prote&#237;na quinase D"
            2 => "ERK5"
            3 => "MEF2D"
            4 => "Cardiomi&#243;citos"
            5 => "Hipertrofia"
          ]
        ]
      ]
    ]
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    "resumen" => array:2 [
      "en" => array:3 [
        "titulo" => "Abstract"
        "resumen" => "<span id="abst0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0010">Objective</span><p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">Cardiomyocyte hypertrophy is an important feature of hypertension&#46; However&#44; its molecular underpinnings&#44; especially the signaling cascades&#44; remain unclear&#46; Here we hypothesized that a protein kinase D &#40;PKD&#41;-dependent extracellular signal-regulated kinase 5 &#40;ERK5&#41; pathway was able to regulate downstream myocyte enhancer factor 2D &#40;MEF2D&#41;&#44; affecting prohypertrophic responses to angiotensin II &#40;Ang II&#41;&#46;</p></span> <span id="abst0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0015">Methods</span><p id="spar0010" class="elsevierStyleSimplePara elsevierViewall">Neonatal rat cardiomyocytes from 2- to 3-day-old Sprague-Dawley rats were prepared and Western blot&#44; real-time quantitative PCR and immunofluorescence staining were used to assess the activation and translocation of pathway signaling molecules&#46; Atrial natriuretic peptide &#40;ANP&#41; and brain natriuretic peptide &#40;BNP&#41; expression and &#91;3H&#93;-leucine &#40;Leu&#41; incorporation were measured to determine cell hypertrophy&#46;</p></span> <span id="abst0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0020">Results</span><p id="spar0015" class="elsevierStyleSimplePara elsevierViewall">Elevated levels of phosphorylated PKD &#40;p-PKD&#41; and ERK5 &#40;p-ERK5&#41; were observed in cardiomyocytes stimulated with Ang II&#44; while silencing protein kinase C epsilon &#40;PKC&#603;&#41; resulted in significantly lower levels of p-PKD&#46; Furthermore&#44; Ang II-induced ERK5 activated translocation was mediated by the PKD pathway&#46; Consequently&#44; inhibiting PKC&#603;&#44; PKD and ERK5 by siRNA significantly attenuated Ang II-induced MEF2D activation&#44; ANP and BNP mRNA expression&#44; and &#91;3H&#93;-Leu incorporation&#46;</p></span> <span id="abst0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0025">Conclusions</span><p id="spar0020" class="elsevierStyleSimplePara elsevierViewall">Our studies are the first to show that the PKC&#603;&#47;PKD&#47;ERK5&#47;MEF2D pathway plays an important role in the cardiomyocyte hypertrophy response to Ang II&#46;</p></span>"
        "secciones" => array:4 [
          0 => array:2 [
            "identificador" => "abst0005"
            "titulo" => "Objective"
          ]
          1 => array:2 [
            "identificador" => "abst0010"
            "titulo" => "Methods"
          ]
          2 => array:2 [
            "identificador" => "abst0015"
            "titulo" => "Results"
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          3 => array:2 [
            "identificador" => "abst0020"
            "titulo" => "Conclusions"
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      "pt" => array:3 [
        "titulo" => "Resumo"
        "resumen" => "<span id="abst0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0035">Objetivos</span><p id="spar0025" class="elsevierStyleSimplePara elsevierViewall">A hipertrofia dos cardiomi&#243;citos &#233; uma caracter&#237;stica importante da hipertens&#227;o arterial&#46; No entanto&#44; os mecanismos moleculares da hipertrofia&#44; especialmente as cascatas sinalizadoras&#44; s&#227;o ainda pouco claros&#46; Neste contexto colocamos a hip&#243;tese de que a prote&#237;na quinase D &#40;PQD&#41; &#8211; dependente da via da quinase 5 &#40;ERK5&#41; determinada pelo sinal extracelular &#8211;possa regular a jusante o fator intensificador do mi&#243;cito -2D &#40;FIM2D&#41;&#44; afetando as respostas pro-hipertr&#243;ficas &#224; Ang II&#46;</p></span> <span id="abst0030" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0040">M&#233;todos</span><p id="spar0030" class="elsevierStyleSimplePara elsevierViewall">Foram preparados os cardiomi&#243;citos de ratos neonatais de dois a tr&#234;s anos&#44; Sprague-Dawley&#44; tendo sido utilizados os testes de Western blot&#44; a PCR quantitaiva Real-Time &#40;PCRq-RTRT&#41; e a colora&#231;&#227;o por imunofluoresc&#234;ncia para avaliar a ativa&#231;&#227;o e a transloca&#231;&#227;o das mol&#233;culas das vias de sinaliza&#231;&#227;o&#46; O fator natriur&#233;tico auricular &#40;FNA&#41;&#44; o pept&#237;deo natriur&#233;tico auricular tipo B &#40;BNP&#41; e a incorpora&#231;&#227;o &#91;3H&#93;-Leu foram igualmente medidos para determinar a hipertrofia celular&#46;</p></span> <span id="abst0035" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0045">Resultados</span><p id="spar0035" class="elsevierStyleSimplePara elsevierViewall">Nos cardiomi&#243;citos estimulados com Ang II foram observados n&#237;veis elevados de PCD fosforilada &#40;PCD-f&#41; e ERK5 &#40;ERK5-p&#41;&#44; tendo a prote&#237;naquinase C epsilon silenciada apresentado n&#237;veis significativamente inferiores de PQD-f&#46; Al&#233;m disso&#44; a transloca&#231;&#227;o ativada de ERK5 induzida pela Ang II foi mediada pela via PCD&#46; Consequentemente&#44; a inibi&#231;&#227;o de PCD&#603;&#44; de PCD e de ERK5 atrav&#233;s de siRNA atenuou significativamente a ativa&#231;&#227;o de FIM2D induzida pela Ang II&#44; o FNA e a express&#227;o de mRNA BNP&#44; bem como a incorpora&#231;&#227;o de Leucina-&#91;3H&#93;&#46;</p></span> <span id="abst0040" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0050">Conclus&#245;es</span><p id="spar0040" class="elsevierStyleSimplePara elsevierViewall">O nosso estudo demonstra pela primeira vez que as vias PCC&#603;&#47;PCD&#47;ERK5&#47;FIM 2D desempenham um papel importante na resposta hipertr&#243;fica dos cardiomi&#243;citos a Ang II&#46;</p></span>"
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        "nota" => "<p class="elsevierStyleNotepara" id="npar0005">These authors contributed equally to this work&#46;</p>"
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          "en" => "<p id="spar0045" class="elsevierStyleSimplePara elsevierViewall">Angiotensin II &#40;Ang II&#41; stimulates PKC&#603;-dependent PKD phosphorylation in cardiomyocytes&#46; &#40;A&#41; Cardiomyocytes were stimulated with Ang II for various times&#46; Phosphorylated PKD &#40;p-PKD&#41; protein levels were examined using Western blotting and normalized to the total levels of PKD&#46; Ang II &#40;100 nM&#44; 0 min&#41; was used as the control&#46; Data are shown as mean &#177; standard error of the mean &#40;SEM&#41; of four separate experiments&#46; &#42;p&#60;0&#46;05 vs&#46; controls&#59; &#40;B&#41; cells were treated without or with Ang II &#40;100 nM&#41; and in the absence or presence of PKC&#603; siRNA&#46; Western blots &#40;n&#61;4&#41; showed the phosphorylation of PKD and expression levels of PKC&#603; and &#946;-actin&#46; Data are shown as mean &#177; SEM&#46; &#42;p&#60;0&#46;05 vs&#46; control siRNA&#43; Ang II&#40;-&#41;&#59; &#35;p&#60;0&#46;05 vs&#46; control siRNA&#43;Ang II&#40;&#43;&#41;&#46;</p>"
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          "en" => "<p id="spar0050" class="elsevierStyleSimplePara elsevierViewall">PKD specifically mediates angiotensin II &#40;Ang II&#41;-induced ERK5 phosphorylation&#46; Cardiomyocytes were transfected with control or PKD small interfering RNA &#40;siRNA&#41;&#44; and then stimulated with Ang II&#46; Phosphorylated ERK5 protein levels were examined using Western blotting and normalized to the total levels of ERK5&#46; Data are shown as mean &#177; standard error of the mean of four separate experiments&#46; &#42;p&#60;0&#46;05 vs&#46; control siRNA&#43; Ang II&#40;-&#41;&#59; &#35;p&#60;0&#46;05 vs&#46; control siRNA&#43;Ang II&#40;&#43;&#41;&#46;</p>"
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          "en" => "<p id="spar0055" class="elsevierStyleSimplePara elsevierViewall">PKD specifically mediates angiotensin II &#40;Ang II&#41;-induced ERK5 translocation&#46; &#40;A&#41; Immunofluorescence staining for ERK5&#44; green &#40;magnification 40&#215;&#41;&#44; scale bar 50 &#956;m&#46; Cardiomyocytes were transfected with control or PKD small interfering RNA &#40;siRNA&#41;&#44; and then stimulated with Ang II for 15 min&#46; The representative images of fluorescence showed the subcellular localization of the proteins &#40;n&#61;4&#41;&#59; &#40;B&#41; Western blot and quantitative analysis of p-ERK5 expression between the nucleus and cytoplasm due to Ang II &#40;100 nM&#44; 15 min&#41; stimulation&#46; Data are shown as the mean &#177; standard error of the mean of four separate experiments&#46; &#42;p&#60;0&#46;05 vs&#46; control siRNA&#43; Ang II&#40;-&#41;&#59; &#35;p&#60;0&#46;05 vs&#46; control siRNA&#43;Ang II&#40;&#43;&#41;&#46;</p>"
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          "en" => "<p id="spar0060" class="elsevierStyleSimplePara elsevierViewall">The PKC&#603;&#47;PKD&#47;ERK5 pathway is involved in angiotensin II &#40;Ang II&#41;-induced MEF2D activation&#46; &#40;A&#41; Cardiomyocytes were stimulated with Ang II for different times &#40;0-60 min&#41;&#46; Phosphorylated MEF2D protein levels were examined using Western blotting and normalized to the total levels of MEF2D&#46; Data are shown as the mean &#177; standard error of the mean of four separate experiments&#46; &#42;p&#60;0&#46;05 vs&#46; control without Ang II stimulation&#59; &#40;B&#41; cardiomyocytes were treated without or with Ang II &#40;100 nM&#41; and in the absence or presence of PKC&#603;&#44; PKD or ERK5 small interfering RNA &#40;siRNA&#41;&#46; &#42;p&#60;0&#46;05 vs&#46; control siRNA&#43; Ang II&#40;-&#41;&#59; &#35;p&#60;0&#46;05 vs&#46; control siRNA&#43;Ang II&#40;&#43;&#41;&#46;</p>"
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          "en" => "<p id="spar0070" class="elsevierStyleSimplePara elsevierViewall">The PKC&#603;&#47;PKD&#47;ERK5 pathway is implicated in angiotensin II &#40;Ang II&#41;-induced cardiomyocyte hypertrophy&#46; &#40;A&#41; Immunostaining for a cardiomyocyte marker &#40;&#945;-actinin&#41;&#59; &#40;B-D&#41; cardiomyocytes were treated without or with Ang II &#40;100 nM&#41; and in the absence or presence of PKC&#603; or PKD or ERK5 siRNA&#46; Microscopy of myocardial cells &#40;B&#41; and &#91;3H&#93;-leucine uptake in cells were analyzed &#40;C&#41;&#44; cell size was also detected &#40;D&#41; &#40;n&#61;4&#41;&#46; Scale bar 50 &#956;m&#46; Data are shown as the mean &#177; standard error of the mean&#46; &#42;p&#60;0&#46;05 vs&#46; control siRNA &#43;Ang II&#40;-&#41;&#59; &#35;p&#60;0&#46;05 vs&#46; control small interfering RNA &#40;siRNA&#41; &#43;Ang II&#40;&#43;&#41;&#59; &#43;p&#60;0&#46;05 vs&#46; control &#40;Ang II 0 min&#41;&#59; &#43;&#43;p&#60;0&#46;05 vs&#46; control siRNA&#46;</p>"
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Revista Portuguesa de Cardiologia
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Você é um profissional de saúde habilitado a prescrever ou dispensar medicamentos

Ao assinalar que é «Profissional de Saúde», declara conhecer e aceitar que a responsável pelo tratamento dos dados pessoais dos utilizadores da página de internet da Revista Portuguesa de Cardiologia (RPC), é esta entidade, com sede no Campo Grande, n.º 28, 13.º, 1700-093 Lisboa, com os telefones 217 970 685 e 217 817 630, fax 217 931 095 e com o endereço de correio eletrónico revista@spc.pt. Declaro para todos os fins, que assumo inteira responsabilidade pela veracidade e exatidão da afirmação aqui fornecida.