Abstract:
OBJECTIVES:We sought to elucidate how the local activation of matrix metalloproteinases (MMPs) is balanced by that of the endogenous tissue inhibitors of MMP (TIMPs) during left ventricular (LV) remodeling. BACKGROUND:Although it is known that the extracellular matrix (ECM) must be altered during LV remodeling, its local regulation has not been fully elucidated. METHODS:In Dahl salt-sensitive rats with hypertension, in which a stage of concentric, compensated left ventricular hypertrophy (LVH) at 11 weeks is followed by a distinct stage of congestive heart failure (CHF) with LV enlargement and dysfunction at 17 weeks, we determined protein and messenger ribonucleic acid (mRNA) levels of LV myocardial TIMP-2 and -4 and MMP-2, as well as their concomitant activities. RESULTS:No changes were found at the LVH stage. However, during the transition to CHF, TIMP-2 and -4 activities, protein and mRNA levels were all sharply increased. At the same time, the MMP-2 mRNA and protein levels and activities, as determined by gelatin zymography, as well as by an antibody capture assay, showed a substantial increase during the transition to CHF. The net MMP activities were closely related to increases in LV diameter (r = 0.763) and to systolic wall stress (r = 0.858) in vivo. CONCLUSIONS:Both TIMPs and MMP-2 remained inactive during hypertrophy, per se; they were activated during the transition to CHF. At this time, the activation of MMP-2 surpassed that of TIMPs, possibly resulting in ECM breakdown and progression of LV enlargement.
journal_name
J Am Coll Cardioljournal_title
Journal of the American College of Cardiologyauthors
Iwanaga Y,Aoyama T,Kihara Y,Onozawa Y,Yoneda T,Sasayama Sdoi
10.1016/s0735-1097(02)01756-4subject
Has Abstractpub_date
2002-04-17 00:00:00pages
1384-91issue
8eissn
0735-1097issn
1558-3597pii
S0735109702017564journal_volume
39pub_type
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更新日期:2007-04-10 00:00:00
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更新日期:2012-01-24 00:00:00
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更新日期:2006-02-21 00:00:00