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- W1983103689 abstract "Matrix metalloproteinases and tissue inhibitors of metalloproteinases regulate extracellular matrix turnover in cardiac tissues. However, alteration of matrix metalloproteinases and tissue inhibitors of metalloproteinases during atrial fibrillation is unclear. This study aims to determine (a) the relationship between altered expressions of matrix metalloproteinases and tissue inhibitors of metalloproteinases and atrial structural remodeling; (b) the role of changes in the atrial angiotensin system and in calcium concentration; and (c) the effect of captopril on the expressions of matrix metalloproteinase-9/tissue inhibitors of metalloproteinase-1 and atrial structural remodeling. In left atrial tissue samples, the mRNA expression of angiotensin-converting enzyme, matrix metalloproteinase-9, and tissue inhibitors of metalloproteinase-1; the protein expression of matrix metalloproteinase-9 and tissue inhibitors of metalloproteinase-1; and Ca2+ concentration and angiotensin II were measured. Compared with controls, dogs under atrial fibrillation showed significantly increased contents of Ca2+, angiotensin II , and interstitial fibrous tissue (P<.05–.001). The mRNA levels of angiotensin-converting enzyme, matrix metalloproteinase-9, and tissue inhibitors of metalloproteinase-1 were significantly increased as compared with controls (P<.05–.01). The protein level of matrix metalloproteinase-9 was higher, and that of tissue inhibitors of metalloproteinase-1 was lower, in dogs with atrial fibrillation than in controls (P<.01–.001). All findings highlighted above were reversed by treatment with captopril. Altered expression of matrix metalloproteinase-9 and tissue inhibitors of metalloproteinase-1 contributes to atrial extracellular matrix remodeling and atrial dilatation. Angiotensin-II-mediated intracellular Ca2+ overload may be the mechanism of altered expression of matrix metalloproteinase-9 and tissue inhibitors of metalloproteinase-1. Angiotensin-converting enzyme inhibitor treatment may attenuate atrial structural remodeling by normalizing the balance between matrix metalloproteinase-9 and tissue inhibitors of metalloproteinase-1." @default.
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- W1983103689 date "2008-11-01" @default.
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- W1983103689 title "Matrix metalloproteinase-9/tissue inhibitors of metalloproteinase-1 expression and atrial structural remodeling in a dog model of atrial fibrillation: inhibition with angiotensin-converting enzyme" @default.
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- W1983103689 doi "https://doi.org/10.1016/j.carpath.2008.02.008" @default.
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