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pubmed-article:19286962pubmed:abstractTextS100A1 is a small Ca(2+)-binding protein expressed in the myocardium and blood vessels that is downregulated in the diseased heart and plays a role in the regulation of cardiac muscle Ca(2+) homeostasis and contractility. To understand its physiological role under basal conditions and after myocardial infarction (MI), we used a mouse strain with targeted deletion of the S100A1 gene [S100A1 knockout (KO) mice]. We compared 49 wild-type (WT) and 56 S100A1 KO mice (6-8 wk old) over 28 days after MI with sham-operated controls. We also examined the effect of S100A1 deficiency on vascular function of isolated blood vessels. S100A1 KO mice demonstrated worse survival compared with WT mice (21% vs. 69%, respectively, P < 0.001). Hemodynamic evaluation revealed a higher mean arterial pressure (MAP) in sham-operated KO animals compared with WT animals (99 +/- 4 vs. 77 +/- 3 mmHg, respectively, P < 0.001) that persisted in both groups after MI (86 +/- 2 vs. 66 +/- 4 mmHg, respectively, P < 0.001). Sham-operated male S100A1 KO mice had higher MAP than female KO mice (122 +/- 5 vs. 93 +/- 3 mmHg, respectively P < 0.05) and reduced survival after MI (4% vs. 27%, respectively, P < 0.05). In isolated aortas and mesenteric arteries, ACh-evoked vasodilatation in KO mice was significantly reduced compared with WT mice (P < 0.05). Nitric oxide production was reduced in endothelial cells isolated from KO mice. Thus, absence of S100A1 results in acute functional impairment and high mortality after MI associated with a gender-specific hypertensive phenotype. S100A1 appears to play a role in the endothelium-dependent regulation of blood pressure.lld:pubmed
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pubmed-article:19286962pubmed:articleTitleLack of S100A1 in mice confers a gender-dependent hypertensive phenotype and increased mortality after myocardial infarction.lld:pubmed
pubmed-article:19286962pubmed:affiliationDivision of Cardiology, St. Michael's Hospital, University of Toronto, 30 Bond St., Rm. 6-044, Queen Wing, Toronto, ON, Canada M5B 1W8.lld:pubmed
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