Deficiency of TIMP-1 exacerbates LV remodeling after myocardial infarction in mice
Departments of 1 Pathology and 3 Pharmacology, Cardiovascular Research Institute Maastricht, University of Maastricht, 6200 MD Maastricht, The Netherlands; and Departments of 2 Cardiothoracic Surgery and 4 Cardiology, Medical University of South Carolina, Charleston, South Carolina 29425 Recent...
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Published in | American journal of physiology. Heart and circulatory physiology Vol. 284; no. 1; pp. H364 - H371 |
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Main Authors | , , , , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
United States
01.01.2003
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Subjects | |
Online Access | Get full text |
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Summary: | Departments of 1 Pathology and
3 Pharmacology, Cardiovascular Research Institute
Maastricht, University of Maastricht, 6200 MD Maastricht, The
Netherlands; and Departments of
2 Cardiothoracic Surgery and
4 Cardiology, Medical University of South Carolina,
Charleston, South Carolina 29425
Recent studies have been directed at
modulating the heart failure process through inhibition of activated
matrix metalloproteinases (MMPs). We hypothesized that a loss of MMP
inhibitory control by tissue inhibitor of MMP (TIMP)-1 deficiency
alters the course of postinfarction chamber remodeling and induced
chronic myocardial infarction (MI) in wild-type (WT) and
TIMP-1 / mice. Left ventricular (LV) pressure-volume
loops obtained from WT and TIMP-1 / mice demonstrated
that LV end-diastolic volume [52 ± 4 (WT) vs. 71 ± 6 (TIMP-1 / ) µl] and LV end-diastolic pressure
[9.0 ± 1.2 (WT) vs. 12.7 ± 1.4 (TIMP-1 / )
mmHg] were significantly increased in the TIMP-1 / mice
2 wk after MI. LV contractility was reduced to a similar degree in the
WT and TIMP-1 / groups after MI, as indicated by a
significant fall in the LV end-systolic pressure-volume relationship.
Ventricular weight and cross-sectional areas of LV myocytes were
significantly increased in TIMP-1 / mice, indicating
that the hypertrophic response was more pronounced. The observed
significant loss of fibrillar collagen in the TIMP-1 /
controls may have been an important contributory factor for the observed LV alterations in the TIMP-1 / mice after MI.
These findings demonstrate that TIMP-1 deficiency amplifies adverse LV
remodeling after MI in mice and emphasizes the importance of local
endogenous control of cardiac MMP activity by TIMP-1.
myocardial remodeling; pressure-volume loops |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0363-6135 1522-1539 |
DOI: | 10.1152/ajpheart.00511.2002 |