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- W2138479426 abstract "Cardiac muscle is tethered within a fibrillar collagen matrix that serves to maximize force generation. In the human pressure-overloaded, hypertrophied left ventricle, collagen concentration is known to be increased; however, the structural and biochemical remodeling of collagen and its relation to cell necrosis and myocardial mechanics is less clear. Accordingly, this study was undertaken in a nonhuman primate model of left ventricular hypertrophy caused by gradual onset experimental hypertension. The amount of collagen, its light microscopic features, and proportions of collagen types I, III, and V were determined together with diastolic and systolic mechanics of the intact ventricle during the evolutionary, early, and late phases of established left ventricular hypertrophy (4, 35, and 88 weeks, respectively). In comparison to controls, we found 1) increased collagen at 4 weeks, as well as a greater proportion of type III, in the absence of myocyte necrosis; 2) collagen septae were thick and dense at 35 weeks, while the proportion of types I and III had converted to control; 3) necrosis was evident at 88 weeks, and the structural remodeling and proportion of collagen types I and III reflected the extent of scar formation; and 4) unlike diastolic myocardial stiffness, which was unchanged at 4, 35, or 88 weeks, the systolic stress-strain relation of the myocardium was altered in either a beneficial or detrimental manner in accordance with structural remodeling of collagen and scar formation. Thus, early in left ventricular hypertrophy, reactive fibrosis and collagen remodeling occur in the absence of necrosis while, later on, reparative fibrosis is present.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
- W2138479426 created "2016-06-24" @default.
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- W2138479426 date "1988-04-01" @default.
- W2138479426 modified "2023-10-16" @default.
- W2138479426 title "Collagen remodeling of the pressure-overloaded, hypertrophied nonhuman primate myocardium." @default.
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- W2138479426 doi "https://doi.org/10.1161/01.res.62.4.757" @default.
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