Regulation and role of myocardial collagen matrix remodeling in hypertensive heart disease

Advances in Experimental Medicine and Biology
R C FunckC G Brilla

Abstract

In hypertensive heart disease, reactive myocardial fibrosis represents as an excessive accumulation of fibrillar collagen within the normal connective tissue structures of the myocardium. The fact, that the myocardium of both ventricles is involved, irrespective of ventricular loading conditions, suggests that circulating factors, and not the hemodynamic load are primary responsible for this adverse response of the myocardial fibrous tissue. In various experimental in vivo models, it has been shown that myocardial fibrosis is always associated with activation of circulating or local renin-angiotensin-aldosterone systems (RAAS). Cardiac collagen metabolism is regulated by cardiac fibroblasts which express mRNAs for types I and III collagens, the major fibrillar collagens in the heart, and for interstitial collagenase or matrix metalloproteinase (MMP) 1 which is the key enzyme for interstitial collagen degradation. In order to elucidate the role of the RAAS effector hormones, angiotensin II (AngII) and aldosterone (ALDO), in the regulation of collagen synthesis or inhibition of MMP 1 production, adult human cardiac fibroblasts were cultured. Collagen synthesis was determined by 3H-proline incorporation, and MMP 1 activity by degr...Continue Reading

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