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transgenic mouse phenotype
early in the development of heart failure
Cardiovascular Institute, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15213
Myocardial extracellular matrix
remodeling regulated by matrix metalloproteinases (MMPs) is implicated
in the progression of heart failure. We hypothesized that MMP
inhibition may modulate extracellular matrix remodeling and prevent the
progression of heart failure. The effects of the MMP inhibitor BB-94
(also known as batimastat) on MMP expression, collagen
expression, collagen deposition, collagen denaturation, and left
ventricular structure and function in transgenic mice with
cardiac-restricted overexpression of tumor necrosis factor-
(TNF-
) (TNF1.6) were assessed. The results showed that BB-94 reduced
the expression of collagens, increased insoluble collagen and the ratio
of undenatured to total soluble collagen, and prevented myocardial
hypertrophy and diastolic dysfunction in young TNF1.6 mice.
Furthermore, the treatment significantly improved cumulative survival
of TNF1.6 mice. However, MMP inhibition did not have salutary effects
on ventricular size and function in old mice with established heart
failure. The results suggest that MMP activation may play a critical
role in changes of myocardial function through the remodeling of
extracellular matrix, and MMP inhibition may serve as a potential
therapeutic strategy for heart failure, albeit within a narrow window
during the development of heart failure.
metalloendopeptidases; ventricular remodeling; extracellular matrix; collagen
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