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    "textoCompleto" => "<span class="elsevierStyleSections"><p id="par0005" class="elsevierStylePara elsevierViewall">Fatal ventricular arrhythmias &#40;VAs&#41; are the leading cause of sudden cardiac death among patients surviving a myocardial infarction &#40;MI&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0055"><span class="elsevierStyleSup">1</span></a> Multiple mechanisms are involved in the development of VAs after MI&#44; including remodeling of ion channels&#44; gap junctions&#44; and histological changes&#46; Sympathetic nerve hyperactivity has also been proposed as a major contributing factor&#46;<a class="elsevierStyleCrossRefs" href="#bib0060"><span class="elsevierStyleSup">2&#44;3</span></a> In fact&#44; although rapid activation of the sympathetic nervous system after MI is an important compensatory mechanism for impaired myocardial function&#44; it has been also implicated in increased local norepinephrine &#40;NE&#41; release&#44; triggering malignant arrhythmias&#46;<a class="elsevierStyleCrossRef" href="#bib0065"><span class="elsevierStyleSup">3</span></a> Furthermore&#44; resident and recruited immune cells following MI were shown to elicit a massive inflammatory response that can induce sympathetic remodeling&#46;<a class="elsevierStyleCrossRef" href="#bib0070"><span class="elsevierStyleSup">4</span></a> Hence&#44; it is proposed that macrophages play a key role in this mechanism&#44; arising as a valuable therapeutic target against VAs&#46;</p><p id="par0010" class="elsevierStylePara elsevierViewall">Multiple neurotransmitters are known to control sympathetic nerve activity&#44; and consequently&#44; cardiovascular function&#46; Interestingly&#44; both glutamate &#40;excitatory&#41; and gamma-aminobutyric acid &#40;GABA&#59; inhibitory&#41; were reported to regulate susceptibility to arrhythmia in hypertensive rats&#46;<a class="elsevierStyleCrossRef" href="#bib0075"><span class="elsevierStyleSup">5</span></a> Nonetheless&#44; the mechanisms underlying such responses remain largely unexplored&#46; In recent years&#44; it was uncovered that peripheral immune cells and microglia express GABA receptors subtypes A and B &#40;GABA-A and GABA-B&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0080"><span class="elsevierStyleSup">6</span></a> Therefore&#44; it is conceivable that GABAergic signaling in cardiac resident immune cells modulate sympathetic activity&#44; including under pathological conditions&#46;</p><p id="par0015" class="elsevierStylePara elsevierViewall">This is the question addressed by Qian Liu et al&#46;<a class="elsevierStyleCrossRef" href="#bib0085"><span class="elsevierStyleSup">7</span></a> in the manuscript &#8220;The protective effect of GABAB receptor activation on sympathetic nerve remodeling via regulating M2 macrophage polarization after myocardial infarction&#8221;&#46; In this article&#44; the authors report the expression of the GABA-B receptor in cultured macrophages&#44; as well as in CD206-positive cells in rat hearts&#46; Moreover&#44; the authors demonstrate GABA-B activation in vitro&#44; either by GABA or with the selective agonist baclofen&#44; promotes the expression of CD206&#44; suggesting a role for GABA-B in mediating transition into alternatively activated macrophages &#40;also termed M2 macrophages&#41;&#46; Importantly&#44; they show a similar increased number of alternatively activated macrophages following baclofen treatment in an animal model of MI&#44; with a concomitant decrease in serum-circulating pro-inflammatory cytokines&#46;</p><p id="par0020" class="elsevierStylePara elsevierViewall">Modulation of GABAergic signaling at the onset of MI is not without precedents&#46; In fact&#44; the GABA-A agonist topiramate was previously demonstrated to modulate macrophage phenotype conversion towards the M2&#47;Ly-6C<span class="elsevierStyleSup">low</span> phenotype&#44; being associated with decreased inflammation&#44; reduced infarct size and improved cardiac function after MI&#46;<a class="elsevierStyleCrossRef" href="#bib0090"><span class="elsevierStyleSup">8</span></a> In contrast&#44; data gathered here show that treatment with baclofen did not significantly reduce infarct size&#44; nor increased survival of mice post-MI&#46; Nonetheless&#44; a protective effect was observed by in vivo administration of GABA&#44; suggesting that the role of GABA-A receptors prevail over GABA-B in controlling post-infarction ventricular remodeling&#46; Besides their immunomodulatory roles&#44; molecules secreted by macrophages can directly impact cardiac electric impulse propagation and modulate arrhythmogenesis&#46; Indeed&#44; it was recently demonstrated that amphiregulin produced by cardiac macrophages prevents the lateralization of the gap junctional protein Connexin43 &#40;Cx43&#41; in cardiomyocytes&#44; which may be relevant in suppressing arrhythmia following MI&#46;<a class="elsevierStyleCrossRefs" href="#bib0095"><span class="elsevierStyleSup">9&#44;10</span></a> Therefore&#44; further investigation should aim at a better understanding of the contribution of macrophage polarization and secretome to arrhythmogenesis and structural remodeling of the heart&#46;</p><p id="par0025" class="elsevierStylePara elsevierViewall">Qian Liu et al&#46; also addressed the impact of GABA-B activation in sympathetic nerve remodeling and demonstrate that baclofen counteracted the accumulation of tyrosine hydroxylase &#40;TH&#41; and growth-associated protein 43 &#40;GAP 43&#41; in infarcted hearts&#46; This was accompanied by decreased serum levels of NE&#44; suggesting that baclofen can prevent sympathetic nerve sprouting and activity in vivo&#46; Although arrhythmogenesis after MI was still observed in animals treated with GABA&#44; it is still conceivable that the frequency and&#47;or duration of those arrhythmic phenomena would be decreased&#44; thereby explaining the higher survival rates of treated animals&#46;</p><p id="par0030" class="elsevierStylePara elsevierViewall">Nonetheless&#44; future studies are required to characterize&#44; in-depth&#44; the role of GABAergic signaling in the development of fatal VAs&#44; as well as to establish novel therapies&#46; Comprehensive strategies targeting not only GABA receptors&#44; but also macrophage polarization and communication networks comprising cardiomyocytes and sympathetic neurons&#44; will be key to the prevention of sudden death following MI&#46;<a class="elsevierStyleCrossRef" href="#bib0060"><span class="elsevierStyleSup">2</span></a></p><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0005">Conflicts of interest</span><p id="par0035" class="elsevierStylePara elsevierViewall">The author has no conflicts of interest to declare&#46;</p></span></span>"
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Cardioprotective role of GABA-B receptor activation on ventricular arrhythmia following myocardial infarction
O papel cardioprotetor da ativação do recetor GABA-B nas arritmias ventriculares após enfarte do miocárdio
Tânia Martins-Marquesa,b,c
a Univ Coimbra, Coimbra Institute for Clinical and Biomedical Research (iCBR), Faculty of Medicine, Coimbra, Portugal
b Univ Coimbra, Center for Innovative Biomedicine and Biotechnology (CIBB), Coimbra, Portugal
c Clinical Academic Centre of Coimbra (CACC), Coimbra, Portugal
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    "textoCompleto" => "<span class="elsevierStyleSections"><p id="par0005" class="elsevierStylePara elsevierViewall">Fatal ventricular arrhythmias &#40;VAs&#41; are the leading cause of sudden cardiac death among patients surviving a myocardial infarction &#40;MI&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0055"><span class="elsevierStyleSup">1</span></a> Multiple mechanisms are involved in the development of VAs after MI&#44; including remodeling of ion channels&#44; gap junctions&#44; and histological changes&#46; Sympathetic nerve hyperactivity has also been proposed as a major contributing factor&#46;<a class="elsevierStyleCrossRefs" href="#bib0060"><span class="elsevierStyleSup">2&#44;3</span></a> In fact&#44; although rapid activation of the sympathetic nervous system after MI is an important compensatory mechanism for impaired myocardial function&#44; it has been also implicated in increased local norepinephrine &#40;NE&#41; release&#44; triggering malignant arrhythmias&#46;<a class="elsevierStyleCrossRef" href="#bib0065"><span class="elsevierStyleSup">3</span></a> Furthermore&#44; resident and recruited immune cells following MI were shown to elicit a massive inflammatory response that can induce sympathetic remodeling&#46;<a class="elsevierStyleCrossRef" href="#bib0070"><span class="elsevierStyleSup">4</span></a> Hence&#44; it is proposed that macrophages play a key role in this mechanism&#44; arising as a valuable therapeutic target against VAs&#46;</p><p id="par0010" class="elsevierStylePara elsevierViewall">Multiple neurotransmitters are known to control sympathetic nerve activity&#44; and consequently&#44; cardiovascular function&#46; Interestingly&#44; both glutamate &#40;excitatory&#41; and gamma-aminobutyric acid &#40;GABA&#59; inhibitory&#41; were reported to regulate susceptibility to arrhythmia in hypertensive rats&#46;<a class="elsevierStyleCrossRef" href="#bib0075"><span class="elsevierStyleSup">5</span></a> Nonetheless&#44; the mechanisms underlying such responses remain largely unexplored&#46; In recent years&#44; it was uncovered that peripheral immune cells and microglia express GABA receptors subtypes A and B &#40;GABA-A and GABA-B&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0080"><span class="elsevierStyleSup">6</span></a> Therefore&#44; it is conceivable that GABAergic signaling in cardiac resident immune cells modulate sympathetic activity&#44; including under pathological conditions&#46;</p><p id="par0015" class="elsevierStylePara elsevierViewall">This is the question addressed by Qian Liu et al&#46;<a class="elsevierStyleCrossRef" href="#bib0085"><span class="elsevierStyleSup">7</span></a> in the manuscript &#8220;The protective effect of GABAB receptor activation on sympathetic nerve remodeling via regulating M2 macrophage polarization after myocardial infarction&#8221;&#46; In this article&#44; the authors report the expression of the GABA-B receptor in cultured macrophages&#44; as well as in CD206-positive cells in rat hearts&#46; Moreover&#44; the authors demonstrate GABA-B activation in vitro&#44; either by GABA or with the selective agonist baclofen&#44; promotes the expression of CD206&#44; suggesting a role for GABA-B in mediating transition into alternatively activated macrophages &#40;also termed M2 macrophages&#41;&#46; Importantly&#44; they show a similar increased number of alternatively activated macrophages following baclofen treatment in an animal model of MI&#44; with a concomitant decrease in serum-circulating pro-inflammatory cytokines&#46;</p><p id="par0020" class="elsevierStylePara elsevierViewall">Modulation of GABAergic signaling at the onset of MI is not without precedents&#46; In fact&#44; the GABA-A agonist topiramate was previously demonstrated to modulate macrophage phenotype conversion towards the M2&#47;Ly-6C<span class="elsevierStyleSup">low</span> phenotype&#44; being associated with decreased inflammation&#44; reduced infarct size and improved cardiac function after MI&#46;<a class="elsevierStyleCrossRef" href="#bib0090"><span class="elsevierStyleSup">8</span></a> In contrast&#44; data gathered here show that treatment with baclofen did not significantly reduce infarct size&#44; nor increased survival of mice post-MI&#46; Nonetheless&#44; a protective effect was observed by in vivo administration of GABA&#44; suggesting that the role of GABA-A receptors prevail over GABA-B in controlling post-infarction ventricular remodeling&#46; Besides their immunomodulatory roles&#44; molecules secreted by macrophages can directly impact cardiac electric impulse propagation and modulate arrhythmogenesis&#46; Indeed&#44; it was recently demonstrated that amphiregulin produced by cardiac macrophages prevents the lateralization of the gap junctional protein Connexin43 &#40;Cx43&#41; in cardiomyocytes&#44; which may be relevant in suppressing arrhythmia following MI&#46;<a class="elsevierStyleCrossRefs" href="#bib0095"><span class="elsevierStyleSup">9&#44;10</span></a> Therefore&#44; further investigation should aim at a better understanding of the contribution of macrophage polarization and secretome to arrhythmogenesis and structural remodeling of the heart&#46;</p><p id="par0025" class="elsevierStylePara elsevierViewall">Qian Liu et al&#46; also addressed the impact of GABA-B activation in sympathetic nerve remodeling and demonstrate that baclofen counteracted the accumulation of tyrosine hydroxylase &#40;TH&#41; and growth-associated protein 43 &#40;GAP 43&#41; in infarcted hearts&#46; This was accompanied by decreased serum levels of NE&#44; suggesting that baclofen can prevent sympathetic nerve sprouting and activity in vivo&#46; Although arrhythmogenesis after MI was still observed in animals treated with GABA&#44; it is still conceivable that the frequency and&#47;or duration of those arrhythmic phenomena would be decreased&#44; thereby explaining the higher survival rates of treated animals&#46;</p><p id="par0030" class="elsevierStylePara elsevierViewall">Nonetheless&#44; future studies are required to characterize&#44; in-depth&#44; the role of GABAergic signaling in the development of fatal VAs&#44; as well as to establish novel therapies&#46; Comprehensive strategies targeting not only GABA receptors&#44; but also macrophage polarization and communication networks comprising cardiomyocytes and sympathetic neurons&#44; will be key to the prevention of sudden death following MI&#46;<a class="elsevierStyleCrossRef" href="#bib0060"><span class="elsevierStyleSup">2</span></a></p><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0005">Conflicts of interest</span><p id="par0035" class="elsevierStylePara elsevierViewall">The author has no conflicts of interest to declare&#46;</p></span></span>"
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