title: Antihypertensive effects of MPC-1304, a novel calcium antagonist, in experimental hypertensive rats and dogs.
abstract: Antihypertensive effects of a novel calcium antagonist, MPC-1304, (+-)-methyl 2-oxopropyl 1,4-dihydro-2,6-dimethyl-4-(2-nitrophenyl)-3,5- pyridine-dicarboxylate and its active metabolites were investigated in experimental hypertensive rats and dogs and compared with those of other dihydropyridine derivatives (nifedipine, nisoldipine, nicardipine, and nitrendipine). MPC-1304 had a dose-related antihypertensive effect with a slight increase in heart rate (HR) in rats. The antihypertensive effects of MPC-1304 were more potent than those of other dihydropyridines, and its active metabolites had antihypertensive effects comparable to those of other dihydropyridines. The hypotensive effects of MPC-1304 were stronger in hypertensive rats than in normotensive rats. During repeated oral administration of MPC-1304 to spontaneously hypertensive rats (SHR, once daily for 4 weeks, 0.3-3 mg/kg), dose-response curves of the antihypertensive effect did not change and body weight gain was equal to that of the vehicle-treated group. When given orally to conscious renal hypertensive dogs, MPC-1304 0.1-0.3 mg/kg had a potency and duration of antihypertensive action comparable to that of nitrendipine (1-3 mg/kg). MPC-1304 increased coronary blood flow (CBF) and aortic blood flow (ABF) in conscious normotensive dogs. In conclusion, MPC-1304 and its active metabolites have potent antihypertensive effects and cause slight tachycardia, and they may be useful in treating hypertension.
mesh_terms: D000284:Administration, Oral; D000818:Animals; D000959:Antihypertensive Agents / Q000494:pharmacology*; D001794:Blood Pressure / Q000187:drug effects; D002121:Calcium Channel Blockers / Q000494:pharmacology*; D003326:Coronary Circulation / Q000187:drug effects; D004095:Dihydropyridines / Q000008:administration & dosage / Q000494:pharmacology*; D004285:Dogs; D006339:Heart Rate / Q000187:drug effects; D006973:Hypertension / Q000188:drug therapy* / Q000503:physiopathology; D006977:Hypertension, Renal / Q000188:drug therapy / Q000503:physiopathology; D009529:Nicardipine / Q000494:pharmacology; D009543:Nifedipine / Q000494:pharmacology; D015737:Nisoldipine / Q000494:pharmacology; D009568:Nitrendipine / Q000494:pharmacology; D051381:Rats; D011918:Rats, Inbred SHR; D017208:Rats, Wistar
chemical_list: D000959:Antihypertensive Agents; D002121:Calcium Channel Blockers; D004095:Dihydropyridines; D015737:Nisoldipine; C059427:aranidipine; D009568:Nitrendipine; D009529:Nicardipine; D009543:Nifedipine