Abstract |
The effects of palonidipine hydrochloride [ TC-81: (+/-)-3-benzylmethylamino)-2,2-dimethylpropyl methyl 4-(2-fluoro-5-nitrophenyl)-1,4-dihydro-2,6-dimethyl-3,5-pyridinedicarboxylate hydrochloride], a new calcium antagonist, on the coronary artery were studied in dogs. In the isolated canine coronary artery, TC-81 inhibited high K+ (60 mM)-induced contraction in a concentration-dependent manner. The relaxant activity of TC-81 was equal to that of nicardipine and more potent than those of nifedipine and diltiazem. TC-81 increased coronary blood flow in a dose-dependent manner after i.v.-administration in anesthetized open-chest dogs. The activity of TC-81 was equal to that of nifedipine or nicardipine, but the duration of its effect was longer than that of nifedipine or nicardipine. By oral administration in conscious dogs, TC-81 increased coronary blood flow at 0.1 mg/kg or more, and its activity was 10 times more potent than that of nifedipine. These results suggest that TC-81 increases coronary blood flow and is capable of improving the oxygen supply-demand relationship during angina pectoris.
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Authors | Y Okamiya, T Kishimoto, K Aoki, K Sunakawa, K Hoshina, T Takeshita |
Journal | Nihon yakurigaku zasshi. Folia pharmacologica Japonica
(Nihon Yakurigaku Zasshi)
Vol. 102
Issue 1
Pg. 23-33
(Jul 1993)
ISSN: 0015-5691 [Print] Japan |
PMID | 8335285
(Publication Type: Comparative Study, English Abstract, Journal Article)
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Chemical References |
- Calcium Channel Blockers
- Dihydropyridines
- Vasodilator Agents
- TC 81
- Diltiazem
- Nifedipine
- Potassium
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Topics |
- Animals
- Calcium Channel Blockers
(pharmacology)
- Coronary Circulation
(drug effects)
- Coronary Vessels
(drug effects)
- Dihydropyridines
(pharmacology)
- Diltiazem
(pharmacology)
- Dogs
- In Vitro Techniques
- Male
- Nifedipine
(pharmacology)
- Potassium
(pharmacology)
- Vasodilator Agents
(pharmacology)
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