Effects of exercise training on cardiac function and myocardial remodeling in post myocardial infarction rats

Xiaohua Xu, Wenhan Wan, Anthony S. Powers, Ji Li, Lisa L. Ji, Shunhua Lao, Bryan Wilson, John M Erikson, John Q. Zhang

Research output: Contribution to journalArticle

57 Citations (Scopus)

Abstract

To test the hypothesis that early exercise training after myocardial infarction (MI) could preserve cardiac function, alleviate left ventricular (LV) remodeling and induce a protective effect on morphology, male Sprague-Dawley rats underwent coronary ligation or sham operation, and were assigned to 3 groups: Sham, sedentary MI (SedMI), and exercise MI (ExMI). We measured the changes in collagen volume fraction, matrix metalloproteinase (MMP) 1, tissue inhibitor matrix metalloproteinase 1 (TIMP-1), angiotensin II receptor type 1 (AT1), and angiotensin converting enzyme (ACE) at gene and protein levels after 8 weeks of exercise training. Cardiac functions were determined by echocardiographic and hemodynamic measurements. Early exercise training after MI had no effect on LV wall thinning. Cardiac function was significantly preserved in the ExMI group in comparison to the SedMI group. The collagen volume fraction in the ExMI group was significantly lower than in the SedMI group. Compared to the SedMI group, the ExMI group showed a markedly decrease at both the gene and protein levels in TIMP-1 (P < 0.05). No significant differences were found in MMP-1 among the three groups. MMP-1/TIMP-1 ratio in the ExMI group was significantly higher than in the SedMI group. In addition, the expression of AT1 protein in the ExMI group was significantly lower than in the SedMI group. Furthermore, both ACE mRNA expression and ACE binding in the ExMI group are significantly decreased compared to the SedMI group. Our results suggest that early exercise training after MI reduces TIMP-1 expression, improves the balance between MMPs and TIMPs, and mitigates the expressions of ACE and AT1 receptor. These improvements, in turn, attenuate myocardial fibrosis and preserve post-MI cardiac function.

Original languageEnglish (US)
Pages (from-to)114-122
Number of pages9
JournalJournal of Molecular and Cellular Cardiology
Volume44
Issue number1
DOIs
StatePublished - Jan 2008

Fingerprint

Matrix Metalloproteinase 1
Myocardial Infarction
Exercise
Tissue Inhibitor of Metalloproteinase-1
Peptidyl-Dipeptidase A
Collagen
Angiotensin Type 1 Receptor
Proteins
Ventricular Remodeling
Matrix Metalloproteinases
Ligation
Sprague Dawley Rats
Fibrosis
Hemodynamics
Messenger RNA

Keywords

  • Exercise
  • Extracellular matrix
  • Fibrosis
  • Infarction
  • Remodeling

ASJC Scopus subject areas

  • Molecular Biology
  • Cardiology and Cardiovascular Medicine

Cite this

Effects of exercise training on cardiac function and myocardial remodeling in post myocardial infarction rats. / Xu, Xiaohua; Wan, Wenhan; Powers, Anthony S.; Li, Ji; Ji, Lisa L.; Lao, Shunhua; Wilson, Bryan; Erikson, John M; Zhang, John Q.

In: Journal of Molecular and Cellular Cardiology, Vol. 44, No. 1, 01.2008, p. 114-122.

Research output: Contribution to journalArticle

Xu, Xiaohua ; Wan, Wenhan ; Powers, Anthony S. ; Li, Ji ; Ji, Lisa L. ; Lao, Shunhua ; Wilson, Bryan ; Erikson, John M ; Zhang, John Q. / Effects of exercise training on cardiac function and myocardial remodeling in post myocardial infarction rats. In: Journal of Molecular and Cellular Cardiology. 2008 ; Vol. 44, No. 1. pp. 114-122.
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