Abstract:
AIM:To investigate the mechanism of melatonin (MT) protection of adult rate myocardial ischemia-reperfusion injury and its influence on rat's hemodynamic recovery. MATERIALS AND METHODS:48 rats were randomly divided into MT group (n=36) and the control group (n=12), MT group was divided into three sub-groups according to different dosages: Group I (n=12) was administered with 2.5 mg/kg MT; Group II (n=12) was administered with 5 mg/kg MT; Group III (n=12) was administered with 10 mg/kg MT. The electrocardiogram of four groups was observed with the left coronary artery blocked for 10min at first and then reperfused for 15min. Hemodynamic evolving was observed and changes in energy metabolism of rat myocardium were monitored. TUNEL and immunohistochemistry were applied to detect the cell apoptosis index, protein expression of Bcl-2 and Bax. RESULTS:LVDP (left ventricular developed pressure) and ± dp/dt in MT group presented better recovery at various time points than the control group. Among them, Group III had the optimal recovery degree (p < 0.05). After MT administration, ATP content in myocardial cells in MT group was significantly higher than the control group. Compared with the control group, the concentration of mitochondrial MDA and Ca2+ in myocardial cells in MT group showed a downward trend. But its GSH concentration was significantly higher than the control group (p < 0.05). The improvement degree of ATP, MDA, GSH and Ca2+ concentration in Group II over-performed Group I (p < 0.05). MT-intervened myocardial apoptosis index (AI) and Bax positive expression index declined while Bcl-2 positive expression index increased (p < 0.01). CONCLUSIONS:MT effectively inhibited myocardial apoptosis during the myocardial ischemia-reperfusion of rats, protected the structural integrity of mitochondria in myocardial cells, promoted ATP synthesis, and avoided heart damage in many ways. This protection mechanism was related with anti-oxidative damage. Meanwhile, MT could promote the hemodynamic recovery after myocardial ischemia-reperfusion in rats.
journal_name
Eur Rev Med Pharmacol Scijournal_title
European review for medical and pharmacological sciencesauthors
Liu LF,Qin Q,Qian ZH,Shi M,Deng QC,Zhu WP,Zhang H,Tao XM,Liu Ysubject
Has Abstractpub_date
2014-01-01 00:00:00pages
3681-6issue
23eissn
1128-3602issn
2284-0729journal_volume
18pub_type
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