TY - JOUR
T1 - Prior exercise training improves the outcome of acute myocardial infarction in the rat
T2 - Heart structure, function, and gene expression
AU - Freimann, Sarit
AU - Scheinowitz, Mickey
AU - Yekutieli, Daniel
AU - Feinberg, Micha S.
AU - Eldar, Michael
AU - Kessler-Icekson, Gania
N1 - Funding Information:
The study was supported by grants (to Drs. Kessler-Icekson and Scheinowitz) from the Chief Scientist Office, Israel Ministry of Health (No. 5118); the Tel-Aviv University Research-Fund; and the Hammer-Fund for Medical Research, Sackler Faculty of Medicine, Tel-Aviv University, Tel Aviv, Israel. This work was performed in partial fulfillment of the requirements for a PhD degree of Sarit Freimann, The Sackler Faculty of Medicine, Tel-Aviv University, Israel.
PY - 2005/3/15
Y1 - 2005/3/15
N2 - OBJECTIVES: The aim of this research was to investigate the structural, functional, and molecular features of the remodeling heart in prior swim-trained infarcted rats. BACKGROUND: Physical exercise training is a known protective factor against cardiovascular morbidity and mortality. The structural and molecular aspects underlying this protection in the remodeling heart have not been investigated. METHODS: After seven weeks of swimming exercise training, rats underwent surgical ligation of the left coronary artery followed by a four-week sedentary period. Untrained control rats underwent the same surgical protocol. Left ventricular function was assessed by echocardiography four weeks after infarction, and hearts were sampled for histological and molecular analysis. Ribonucleic acid from the surviving left ventricle was analyzed by complementary deoxyribonucleic acid arrays followed by Northern blotting or quantitative reverse transcription polymerase chain reaction of selected messenger ribonucleic acids (mRNAs). RESULTS: Scar area was 1.6-fold smaller (p = 0.0002), arteriolar density was 1.7-fold higher (p = 0.0002), and left ventricular shortening fraction was 1.9-fold higher (p = 0.003) in the exercise-trained compared with sedentary hearts. Eleven genes whose expression level varied by at least ±1.5-fold distinguished the prior exercised rats from their sedentary counterparts. Compared with sedentary, the exercised hearts displayed 9- and 2.4-times lower levels of atrial natriuretic peptide and aldolase mRNA (p = 0.03 and 0.04, respectively), and a 2.7- and 1.9-fold higher abundance of cytochrome c-oxidase and fatty acid binding protein, respectively (p < 0.03, each). CONCLUSIONS: Swimming exercise training before acute myocardial infarction reduces scar size, increases arteriole density, and manifests adaptation of stress- and energy-metabolism-related genes that may contribute to the improved heart function observed during remodeling.
AB - OBJECTIVES: The aim of this research was to investigate the structural, functional, and molecular features of the remodeling heart in prior swim-trained infarcted rats. BACKGROUND: Physical exercise training is a known protective factor against cardiovascular morbidity and mortality. The structural and molecular aspects underlying this protection in the remodeling heart have not been investigated. METHODS: After seven weeks of swimming exercise training, rats underwent surgical ligation of the left coronary artery followed by a four-week sedentary period. Untrained control rats underwent the same surgical protocol. Left ventricular function was assessed by echocardiography four weeks after infarction, and hearts were sampled for histological and molecular analysis. Ribonucleic acid from the surviving left ventricle was analyzed by complementary deoxyribonucleic acid arrays followed by Northern blotting or quantitative reverse transcription polymerase chain reaction of selected messenger ribonucleic acids (mRNAs). RESULTS: Scar area was 1.6-fold smaller (p = 0.0002), arteriolar density was 1.7-fold higher (p = 0.0002), and left ventricular shortening fraction was 1.9-fold higher (p = 0.003) in the exercise-trained compared with sedentary hearts. Eleven genes whose expression level varied by at least ±1.5-fold distinguished the prior exercised rats from their sedentary counterparts. Compared with sedentary, the exercised hearts displayed 9- and 2.4-times lower levels of atrial natriuretic peptide and aldolase mRNA (p = 0.03 and 0.04, respectively), and a 2.7- and 1.9-fold higher abundance of cytochrome c-oxidase and fatty acid binding protein, respectively (p < 0.03, each). CONCLUSIONS: Swimming exercise training before acute myocardial infarction reduces scar size, increases arteriole density, and manifests adaptation of stress- and energy-metabolism-related genes that may contribute to the improved heart function observed during remodeling.
UR - http://www.scopus.com/inward/record.url?scp=14844288316&partnerID=8YFLogxK
U2 - 10.1016/j.jacc.2004.11.052
DO - 10.1016/j.jacc.2004.11.052
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AN - SCOPUS:14844288316
SN - 0735-1097
VL - 45
SP - 931
EP - 938
JO - Journal of the American College of Cardiology
JF - Journal of the American College of Cardiology
IS - 6
ER -