1. Orally administered benidipine and manidipine prevent ischemia-reperfusion injury in the rat heart.
- Author
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Masanori S, Toshihiko S, Koji H, Hidekazu H, Mitsuharu H, Takanobu A, Takeshi I, Yasuyuki B, and Shigefumi S
- Subjects
- Administration, Oral, Animals, Blood Pressure drug effects, Coronary Circulation drug effects, Creatine Kinase blood, Male, Myocardial Ischemia blood, Myocardial Ischemia physiopathology, Myocardial Reperfusion Injury blood, Myocardial Reperfusion Injury physiopathology, Nitrobenzenes, Piperazines, Rats, Rats, Wistar, Ventricular Function, Left drug effects, Antihypertensive Agents administration & dosage, Dihydropyridines administration & dosage, Myocardial Ischemia prevention & control, Myocardial Reperfusion Injury prevention & control, Vasodilator Agents administration & dosage
- Abstract
Background: The present study was designed to investigate whether orally administered benidipine and manidipine protect the myocardium from ischemia - reperfusion injury., Methods and Results: Each drug (1, 3 or 10 mg/kg) was administered orally once daily for 1 week. The isolated rat heart model (Langendorff perfusion) was used, and each heart was subjected to global ischemia at 37 degrees C for 40 min followed by reperfusion. Post-ischemic recovery of left ventricular (LV) function (measured as developed pressure (LVDP), dP/dt max and end-diastolic pressure) was compared with a control group. Creatine kinase (CK) leakage was also measured. Post-ischemic recovery of LVDP and LV dP/dt max were significantly increased by 3 mg/kg benidipine (LVDP: 87.5+/-10.1 vs 64.6+/-11.9%; LV dP/dt max: 97.8+/-10.4 vs 70.2+/-15.7%; p<0.05). CK leakage was significantly lower than in the control group (39.4+/-7.5 vs 61.1 +/-9.8 IU per 15 min per kg; p<0.05). Manidipine produced significant recoveries in LVDP and dP/dt max at a dose of 1 mg/kg (LVDP: 93.7+/-16.5% vs 53.4+/-9.5%; dP/dt max: 104.2+/-21.9% vs 55.5+/-15.5%; p<0.05). CK leakage was also significantly reduced at the same dose (50.0+/-18.3 vs 80.1+/-14.0 IU per 15 min per kg; p<0.05)., Conclusions: Orally administered benidipine and manidipine exerted significant cardioprotective effects against ischemia - reperfusion injury.
- Published
- 2004
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