Time course of collagen and decorin changes in rat cardiac and skeletal muscle post-MI

1  Division of Kinesiology and Health and 2  Department of Animal Science, University of Wyoming, Laramie, Wyoming 82071; and 3  Department of Animal Sciences, Ohio State University, Wooster, Ohio 44691 We examined the temporal relationship between messages (type I and type III mRNAs) for the princi...

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Published in:American journal of physiology. Heart and circulatory physiology 2001-10, Vol.281 (4), p.H1816-H1822
Main Authors: Zimmerman, Scott D, Thomas, D. Paul, Velleman, Sandra G, Li, Xia, Hansen, Thomas R, McCormick, Richard J
Format: Article
Language:English
Subjects:
Animals
Collagen - metabolism
Decorin
Extracellular Matrix Proteins
Muscle, Skeletal - metabolism
Myocardial Infarction - metabolism
Myocardium - metabolism
Osmolar Concentration
Procollagen - genetics
Proteoglycans - metabolism
Rats
RNA, Messenger - metabolism
Time Factors
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Summary:1  Division of Kinesiology and Health and 2  Department of Animal Science, University of Wyoming, Laramie, Wyoming 82071; and 3  Department of Animal Sciences, Ohio State University, Wooster, Ohio 44691 We examined the temporal relationship between messages (type I and type III mRNAs) for the principal fibrillar procollagens and subsequent collagen accretion, cross-linking, and decorin expression in the left ventricle (LV) postmyocardial infarction (post-MI). We sought to determine 1 ) what role the proteoglycan decorin plays in extracellular matrix (ECM) remodeling known to take place as a consequence of MI and 2 ) the extent skeletal muscle ECM is altered early post-MI. Therefore, after surgically induced production of small- to moderate-sized infarcts (~20% of LV mass), extent and time course of ECM remodeling was evaluated in remaining viable LV free wall and in slow- [soleus (SOL)] and fast-twitch [gastrocnemius (GAST)] skeletal muscles. Decorin, collagen, and hydroxylysylpyridinium cross-link concentrations and 1(I) (type I) and 1(III) (type III) procollagen mRNAs were measured in LVs from noninfarcted controls and at 72 h, 1, 2, 5, and 13 wk post-MI. These same data were collected in SOL and GAST muscles at all time points except 13 wk. Type I procollagen mRNA increased at both 72-h and 1-wk time points in LVs. Type III procollagen mRNA was elevated at 1 wk, returning to baseline by 2 wk post-MI. Collagen concentration was significantly increased by 1 wk, more than doubled by 5 wk, and was elevated 129% by 13 wk in the remaining viable LV. LV decorin expression was unaltered at early time points, but increased 38% at 5 wk post-MI and doubled by 13 wk post-MI. In skeletal muscle, procollagen mRNAs were transiently altered in SOL and GAST muscles without any demonstrable effect on the measured ECM parameters. This study reports, for the first time, the upregulation time course of decorin and its relationship to increased HP cross-linking and accumulation of collagen in viable myocardium post-MI. cardiac remodeling; collagen cross-linking; procollagen mRNA
ISSN:0363-6135
1522-1539
DOI:10.1152/ajpheart.2001.281.4.h1816