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    "textoCompleto" => "<span class="elsevierStyleSections"><p id="par0005" class="elsevierStylePara elsevierViewall">&#8220;First of all&#44; forgive me for speaking to you seated&#44; but the truth is that if I stand&#44; I run the risk of collapsing with fear&#46;&#8221; &#8211; Gabriel Garcia M&#225;rquez<a class="elsevierStyleCrossRef" href="#bib0100"><span class="elsevierStyleSup">1</span></a></p><p id="par0010" class="elsevierStylePara elsevierViewall">The article by Bolay&#305;r et al&#46; on the role of SCUBE1 in the pathogenesis of late stent thrombosis presenting with ST-elevation myocardial infarction &#40;STEMI&#41; published in this issue of the <span class="elsevierStyleItalic">Journal</span><a class="elsevierStyleCrossRef" href="#bib0105"><span class="elsevierStyleSup">2</span></a> sends us into the wider world of biomarkers and translational medicine&#44; which have driven much of the research on atherothrombosis in recent years&#46; Russell Ross&#39;s landmark 1999 work<a class="elsevierStyleCrossRef" href="#bib0110"><span class="elsevierStyleSup">3</span></a> on the inflammatory etiology of atherosclerosis opened a Pandora&#39;s box for those who search within the fine structure of the highly complex processes of atherosclerotic pathophysiology for molecules that are directly or indirectly related to the mechanisms of atherosclerosis&#44; from their inflammatory genesis to the eventual thrombotic event&#46; However&#44; no molecule fully accounts for an entire process&#44; and so each biomarker has a limited ability to represent reality&#46;<a class="elsevierStyleCrossRef" href="#bib0115"><span class="elsevierStyleSup">4</span></a> This principle should be kept in mind and put into practice&#46;</p><p id="par0015" class="elsevierStylePara elsevierViewall">The study by Bolay&#305;r et al&#46; aims to present the results for a new biomarker associated with late stent thrombosis in STEMI patients&#46; It sets out to address two important issues&#46; The first is the importance of early assessment of stent thrombosis&#44; a relatively rare but serious complication that has been extensively studied&#44;<a class="elsevierStyleCrossRefs" href="#bib0120"><span class="elsevierStyleSup">5&#8211;7</span></a> especially with regard to the differences between bare-metal stents &#40;BMS&#41; and the newer drug-eluting stents &#40;DES&#41;&#46;<a class="elsevierStyleCrossRefs" href="#bib0135"><span class="elsevierStyleSup">8&#44;9</span></a> The latter are in theory less susceptible to in-stent restenosis&#44; even in patients with significant predisposing factors&#44; such as diabetes&#46;<a class="elsevierStyleCrossRef" href="#bib0145"><span class="elsevierStyleSup">10</span></a> The authors&#8217; second focus is platelet activation&#44; which plays a crucial role in the progression of atherothrombosis&#46; There is growing evidence of the importance of platelets in the atherosclerotic process and of their effects&#44; ranging from the inflammation that initiates atheroma formation when they bind to leukocytes and endothelial cells&#44; to platelet activation itself&#44; due to plaque rupture or erosion&#44; triggering coronary thrombosis&#46;<a class="elsevierStyleCrossRef" href="#bib0150"><span class="elsevierStyleSup">11</span></a> As evidence of the importance of platelet activity&#44; a large number of biomarkers are known to influence this process&#44; which can be divided into circulating and membrane-associated molecules&#46; These molecules have been particularly thoroughly studied in the context of acute ischemia&#46;<a class="elsevierStyleCrossRef" href="#bib0155"><span class="elsevierStyleSup">12</span></a></p><p id="par0020" class="elsevierStylePara elsevierViewall">Bolay&#305;r et al&#46; assess this issue through the potential of a novel platelet adhesion molecule&#44; whose complex name &#8211; signal peptide-CUB &#40;for complement proteins C1r&#47;C1s&#44; Uegf and Bmp1&#41;-EGF &#40;for epidermal growth factor&#41;-like domain-containing protein 1 &#40;SCUBE1&#41; &#8211; is somewhat intimidating for cardiologists who are unfamiliar with the latest findings in basic research&#46;<a class="elsevierStyleCrossRef" href="#bib0160"><span class="elsevierStyleSup">13</span></a> This protein is the founding member of a cell membrane-associated class of molecules known as the SCUBE family&#46; Members of this new family have been identified in human endothelial cells and platelets&#46;<a class="elsevierStyleCrossRef" href="#bib0165"><span class="elsevierStyleSup">14</span></a> The SCUBE1 protein is normally stored in platelet alpha granules and translocated to the surface on thrombin activation&#46; It is also incorporated into the growing thrombus&#46;<a class="elsevierStyleCrossRefs" href="#bib0155"><span class="elsevierStyleSup">12&#44;14</span></a></p><p id="par0025" class="elsevierStylePara elsevierViewall">SCUBE1 has been proposed as a novel platelet endothelial cell adhesion molecule&#44; since particularly high serum levels are found in atherothrombotic conditions such as acute coronary syndrome and large-vessel thrombotic stroke&#46;<a class="elsevierStyleCrossRef" href="#bib0155"><span class="elsevierStyleSup">12</span></a> The molecule also promotes platelet-platelet interaction and is involved in platelet adhesion to the subendothelial matrix&#46;<a class="elsevierStyleCrossRef" href="#bib0160"><span class="elsevierStyleSup">13</span></a> Moreover&#44; deposition of SCUBE1 has been found in the subendothelial matrix of advanced atherosclerotic lesions&#46;<a class="elsevierStyleCrossRef" href="#bib0165"><span class="elsevierStyleSup">14</span></a> SCUBE1 blockade may even be a new antithrombotic strategy&#46;<a class="elsevierStyleCrossRef" href="#bib0170"><span class="elsevierStyleSup">15</span></a> All of the above data on this new biomarker makes it potentially attractive for the diagnosis of arterial thrombosis in medium-sized and large vessels&#44;<a class="elsevierStyleCrossRefs" href="#bib0175"><span class="elsevierStyleSup">16&#44;17</span></a> as a marker of ischemia in acute coronary syndrome&#44;<a class="elsevierStyleCrossRef" href="#bib0185"><span class="elsevierStyleSup">18</span></a> or even as a new therapeutic target&#46;</p><p id="par0030" class="elsevierStylePara elsevierViewall">This potential led the authors to proceed with the clinical study presented here&#46; Their methodology is open to criticism&#44; since only 40 patients with documented stent thrombosis hospitalized due to STEMI were recruited&#44; compared to a substantially larger heterogeneous control population &#40;n&#61;150&#41;&#44; consisting of patients with STEMI &#40;n&#61;100&#41; and no late stent thrombosis and patients who were healthy on cardiovascular assessment &#40;n&#61;50&#41;&#46; The authors acknowledge that the small sample size is a limitation that could be resolved in the future by conducting a multicenter study&#46; Another limitation is the lack of data on which stents were used in the study population &#40;BMS vs&#46; DES&#41;&#46; This information would give a more solid foundation to the study&#39;s conclusions&#46; However&#44; the statistical analysis does not appear to have been affected by the heterogeneity of the control group&#44; since in all cases three groups are compared&#44; thus maintaining the different characteristics of the study groups&#46;</p><p id="par0035" class="elsevierStylePara elsevierViewall">The discussion conveys the importance of platelet activation in acute coronary ischemia&#44; as well as in other vascular conditions&#44; such as ischemic stroke&#46;<a class="elsevierStyleCrossRef" href="#bib0175"><span class="elsevierStyleSup">16</span></a> Bolay&#305;r et al&#46; are right to stress this point&#44; since the role of platelet adhesion markers has already been demonstrated by the importance of the CD40 ligand&#44; elevated levels of which are associated with unstable coronary artery disease&#46;<a class="elsevierStyleCrossRef" href="#bib0190"><span class="elsevierStyleSup">19</span></a> The authors set out to add to this knowledge in their study&#44; in which&#44; despite the above-mentioned limitations&#44; they claim to have proved the relationship between late stent thrombosis and serum SCUBE1 level&#46;</p><p id="par0040" class="elsevierStylePara elsevierViewall">For our part&#44; we recognize that the study has limitations&#44; but it is headed in the right direction&#46; As in the quotation by Gabriel Garc&#237;a M&#225;rquez&#44; a writer known for his humility&#44; we suggest that it is better to proceed with caution&#59; with regard to SCUBE1 in the great ocean of biomarkers of atherothrombotic disease&#44; it is better to speak while seated&#44; since we could lose our way if we say too much&#46; We believe that there is still much to be learned before this promising molecule can reach clinical practice&#46;</p><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0005">Conflicts of interest</span><p id="par0045" class="elsevierStylePara elsevierViewall">The author has no conflicts of interest to declare&#46;</p></span></span>"
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Journal Information
Vol. 37. Issue 5.
Pages 383-385 (May 2018)
Vol. 37. Issue 5.
Pages 383-385 (May 2018)
Editorial comment
Open Access
SCUBE 1: A novel biomarker related to platelet activation and atherothrombosis
SCUBE1 – Um novo biomarcador associado a ativação plaquetária e aterotrombose
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Luís Bronzea,b,c
a Hospital das Forças Armadas, Polo de Lisboa, Lisboa, Portugal
b Faculdade de Ciências da Saúde, Mestrado Integrado de Medicina, Universidade da Beira Interior, Covilhã, Portugal
c Linha de Saúde, Centro de Investigação Naval (CINAV), Marinha Portuguesa, Lisboa, Portugal
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“First of all, forgive me for speaking to you seated, but the truth is that if I stand, I run the risk of collapsing with fear.” – Gabriel Garcia Márquez1

The article by Bolayır et al. on the role of SCUBE1 in the pathogenesis of late stent thrombosis presenting with ST-elevation myocardial infarction (STEMI) published in this issue of the Journal2 sends us into the wider world of biomarkers and translational medicine, which have driven much of the research on atherothrombosis in recent years. Russell Ross's landmark 1999 work3 on the inflammatory etiology of atherosclerosis opened a Pandora's box for those who search within the fine structure of the highly complex processes of atherosclerotic pathophysiology for molecules that are directly or indirectly related to the mechanisms of atherosclerosis, from their inflammatory genesis to the eventual thrombotic event. However, no molecule fully accounts for an entire process, and so each biomarker has a limited ability to represent reality.4 This principle should be kept in mind and put into practice.

The study by Bolayır et al. aims to present the results for a new biomarker associated with late stent thrombosis in STEMI patients. It sets out to address two important issues. The first is the importance of early assessment of stent thrombosis, a relatively rare but serious complication that has been extensively studied,5–7 especially with regard to the differences between bare-metal stents (BMS) and the newer drug-eluting stents (DES).8,9 The latter are in theory less susceptible to in-stent restenosis, even in patients with significant predisposing factors, such as diabetes.10 The authors’ second focus is platelet activation, which plays a crucial role in the progression of atherothrombosis. There is growing evidence of the importance of platelets in the atherosclerotic process and of their effects, ranging from the inflammation that initiates atheroma formation when they bind to leukocytes and endothelial cells, to platelet activation itself, due to plaque rupture or erosion, triggering coronary thrombosis.11 As evidence of the importance of platelet activity, a large number of biomarkers are known to influence this process, which can be divided into circulating and membrane-associated molecules. These molecules have been particularly thoroughly studied in the context of acute ischemia.12

Bolayır et al. assess this issue through the potential of a novel platelet adhesion molecule, whose complex name – signal peptide-CUB (for complement proteins C1r/C1s, Uegf and Bmp1)-EGF (for epidermal growth factor)-like domain-containing protein 1 (SCUBE1) – is somewhat intimidating for cardiologists who are unfamiliar with the latest findings in basic research.13 This protein is the founding member of a cell membrane-associated class of molecules known as the SCUBE family. Members of this new family have been identified in human endothelial cells and platelets.14 The SCUBE1 protein is normally stored in platelet alpha granules and translocated to the surface on thrombin activation. It is also incorporated into the growing thrombus.12,14

SCUBE1 has been proposed as a novel platelet endothelial cell adhesion molecule, since particularly high serum levels are found in atherothrombotic conditions such as acute coronary syndrome and large-vessel thrombotic stroke.12 The molecule also promotes platelet-platelet interaction and is involved in platelet adhesion to the subendothelial matrix.13 Moreover, deposition of SCUBE1 has been found in the subendothelial matrix of advanced atherosclerotic lesions.14 SCUBE1 blockade may even be a new antithrombotic strategy.15 All of the above data on this new biomarker makes it potentially attractive for the diagnosis of arterial thrombosis in medium-sized and large vessels,16,17 as a marker of ischemia in acute coronary syndrome,18 or even as a new therapeutic target.

This potential led the authors to proceed with the clinical study presented here. Their methodology is open to criticism, since only 40 patients with documented stent thrombosis hospitalized due to STEMI were recruited, compared to a substantially larger heterogeneous control population (n=150), consisting of patients with STEMI (n=100) and no late stent thrombosis and patients who were healthy on cardiovascular assessment (n=50). The authors acknowledge that the small sample size is a limitation that could be resolved in the future by conducting a multicenter study. Another limitation is the lack of data on which stents were used in the study population (BMS vs. DES). This information would give a more solid foundation to the study's conclusions. However, the statistical analysis does not appear to have been affected by the heterogeneity of the control group, since in all cases three groups are compared, thus maintaining the different characteristics of the study groups.

The discussion conveys the importance of platelet activation in acute coronary ischemia, as well as in other vascular conditions, such as ischemic stroke.16 Bolayır et al. are right to stress this point, since the role of platelet adhesion markers has already been demonstrated by the importance of the CD40 ligand, elevated levels of which are associated with unstable coronary artery disease.19 The authors set out to add to this knowledge in their study, in which, despite the above-mentioned limitations, they claim to have proved the relationship between late stent thrombosis and serum SCUBE1 level.

For our part, we recognize that the study has limitations, but it is headed in the right direction. As in the quotation by Gabriel García Márquez, a writer known for his humility, we suggest that it is better to proceed with caution; with regard to SCUBE1 in the great ocean of biomarkers of atherothrombotic disease, it is better to speak while seated, since we could lose our way if we say too much. We believe that there is still much to be learned before this promising molecule can reach clinical practice.

Conflicts of interest

The author has no conflicts of interest to declare.

References
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Yo no vengo a decir un discurso.
1st ed., Vintage Español, (2010),
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The role of SCUBE1 in the development of late stent thrombosis presenting with ST-elevation myocardial infarction.
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Diagnostic value of plasma signal peptide-Cub-Egf domain-containing protein-1 (SCUBE-1) in an experimental model of acute ischemic stroke.
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Plasma concentration of SCUBE1, a novel platelet protein, is elevated in patients with acute coronary syndrome and ischemic stroke.
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Please cite this article as: Bronze L. SCUBE1 – Um novo biomarcador associado a ativação plaquetária e aterotrombose. Rev Port Cardiol. 2018;37:383–385.

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