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The dynamic interaction between matrix metalloproteinase activity and adverse myocardial remodeling
Joseph S Janicki1, Gregory L Brower, Jason D Gardner
1Department of Anatomy, Physiology & Pharmacology, Auburn University, Auburn, AL 36849-5517, USA. janicjs@auburn.edu
Heart Failure Reviews
|January 24, 2004
Summary
Cardiac remodeling involves progressive changes in heart chambers and myocardium following injury. This process, occurring in three phases, can lead to heart failure if compensatory mechanisms fail.
Area of Science:
- Cardiology
- Biomedical Engineering
- Pathology
Background:
- Cardiac remodeling is a response to injury or stress, altering heart dimensions and myocardial components.
- Sustained abnormal myocardial wall stress initiates remodeling, often leading to ventricular decompensation and heart failure.
Purpose of the Study:
- To detail the progressive, dynamic cardiac remodeling process.
- To examine the effects of remodeling on ventricular function under various stress conditions.
Main Methods:
- The study outlines a three-phase process of cardiac remodeling.
- Key factors discussed include matrix metalloproteinase (MMP) activity, collagen degradation, cardiomyocyte hypertrophy, and fibrosis.
Main Results:
- Phase 1: Fibrillar collagen degradation due to increased MMP activity.
- Phase 2: Compensatory phase with normalized MMP and collagen, but continued cardiomyocyte growth.
- Phase 3: Exhaustion of compensatory mechanisms, marked by elevated MMP, ventricular dilation, and fibrosis.
Conclusions:
- Cardiac remodeling is a dynamic, multi-phase process initiated by myocardial wall stress.
- Understanding these phases is crucial for addressing ventricular decompensation and heart failure.