© 2001 by European Society of Cardiology
Copyright © 2001, European Society of Cardiology
Cardiac remodeling after long term norepinephrine treatment in rats
aCarl-Ludwig-Institute of Physiology, University of Leipzig, Liebigstr. 27, D-04103 Leipzig, Germany
bGerhard-Domagk-Institute of Pathology, University of Münster, Münster, Germany
* Tel.: +49-0341-971-5500; fax: +49-0341-971-5509 barw{at}medizin.uni-leipzig.de
Objective: In this study we have tested the hypothesis that degradation of collagen by matrix metalloproteinase 2 (MMP-2) precedes the deposition of extracellular matrix (ECM) after long term norepinephrine (NE) treatment. Methods: Female Sprague–Dawley rats received continuous i.v. infusion of NE (0.1 mg/kg·h) for 1, 2, 3, 4 and 14 days. Heart function and weight as well as expression of cardiac colligin and of collagen I and III were examined. Furthermore, we have assessed the degradation pathway of collagen by measuring the mRNA and activity of myocardial MMP-2 and tissue inhibitor of metalloproteinase 2 (TIMP-2) as well as the protein level of TIMP-2. Results: NE induced hypertrophy predominantly of the left ventricle (LV) in a time-dependent manner. It increased the mRNAs of colligin, collagen I and III, and of MMP-2 and TIMP-2 as well as MMP-2 activity in two phases: In the initial phase, at 3 and 4 days, the mRNA of colligin and of collagen I and III was elevated predominantly in the LV, MMP-2 and TIMP-2 mRNA, as well as TIMP-2 protein and MMP-activity were increased in both ventricles. The second phase, after 14 days, was characterized by a less pronounced increase in colligin, collagen I and III and in MMP-2 activity which occurred exclusively in the LV. Finally, long-term treatment with NE induced a 37% increase in interstitial fibrosis which was shown to occur exclusively in the LV after 14 days. Conclusion: NE treatment induced fibrosis exclusively in the LV which was associated with hypertrophy predominantly of the LV. The elevated MMP-2 activity seems to be necessary for the ECM to adapt to the enlargement of myocytes and to reduce overproduction of collagen.
KEYWORDS Adrenergic (ant)agonists; Extracellular matrix; Fibrosis; Gene expression; Hemodynamics; Hypertrophy; Receptors
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