The protective effect of L-carnitine on ischemia-reperfusion heart.
To investigate the protective effect of L-carnitine on myocardial ischemia-reperfusion injury in rat heart,all harvested isolated hearts were perfused on Langendorff apparatus with oxygenized K-H solution for 20 min. The hearts were then exposed to ischemia for 30 min. Following the ischemia the hearts were re-perfused with K-H solution for 120 min to serve as the control group A. Either 5 or 10 mmol/L of L-carnitine was added into the K-H solution for 20 min at the beginning of reperfusion to generate group B and group C, respectively. The derivatives of the intraventricular pressure curve (DP/DT), left ventricular developed pressure (LVDP), and coronary flux were monitored during the entire experiment. The levels of ATP, hepatin, malondialdehyde (MDA), and superoxide dismutase (SOD) in tissue, and lactic dehydrogenase (LDH), creatine phosphate kinase (CPK), malondialdehyde (MDA), and superoxide dismutase (SOD) concentration in the coronary efflux were all measured. Compared with the control group, the treatment with L-carnitine resulted in better results, i. e., higher DP/DTmax and LVDP. At the same time, ventricular fibrillation was reduced, and the levels of ATP, hepatin and SOD were all elevated. However, the concentrations of MDA, CPK and LDH were all reduced. In conclusion, L-carnitine has a protective effect on ischemia-reperfusion injury, which is partly due to its prevention of energy loss and its antioxidant activity.
Xie
Jiang
J
Department of Cardiology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology , Wuhan, China.
Zeng
Qiutang
Q
Wang
Le
L
D000255:Adenosine Triphosphate / Q000378:metabolism; D000818:Animals; D002316:Cardiotonic Agents / Q000494:pharmacology*; D002331:Carnitine / Q000494:pharmacology*; D003402:Creatine Kinase / Q000378:metabolism; D006321:Heart / Q000187:drug effects / Q000503:physiopathology; D007770:L-Lactate Dehydrogenase / Q000378:metabolism; D008297:Male; D008315:Malondialdehyde / Q000378:metabolism; D015428:Myocardial Reperfusion Injury / Q000378:metabolism / Q000503:physiopathology / Q000517:prevention & control*; D009206:Myocardium / Q000378:metabolism / Q000473:pathology; D051381:Rats; D017207:Rats, Sprague-Dawley; D013482:Superoxide Dismutase / Q000378:metabolism; D014803:Vitamin B Complex / Q000494:pharmacology
D002316:Cardiotonic Agents; D014803:Vitamin B Complex; D008315:Malondialdehyde; D000255:Adenosine Triphosphate; D007770:L-Lactate Dehydrogenase; D013482:Superoxide Dismutase; D003402:Creatine Kinase; D002331:Carnitine