MODIFICATION OF ANGIOTENSIN II-INDUCED RELAXATION BY DIPYRIDAMOLE, PHTHALAZINOL AND ASPIRIN IN ISOLATED DOG RENAL ARTERIES
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概要
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Angiotensin (ANG) II-induced relaxations in isolated dog renal and cerebral arteries are postulated to be mediated by the release of prostaglandin (PG) I<SUB>2</SUB> from the arterial wall. In helical strips of dog renal arteries treated with dipyridamole, relaxations induced by ANG II (10<SUP>-7</SUP> M) and exogenously applied PGI<SUB>2</SUB> (10<SUP>-8</SUP> M) were potentiated; the potentiation was appreciably greater in the ANG-induced relaxation. Treatment with phthalazinol did not alter the response to ANG II, but significantly potentiated the relaxation induced by PGI<SUB>2</SUB>. The ANG-induced relaxations were suppressed or reversed to contractions by aspirin or indomethacin. Combined treatment of dipyridamole with aspirin or indomethacin restored the relaxant response to ANG II, while phthalazinol in combination with aspirin did not restore the response. It may be concluded that the potentiation of responses to ANG II by dipyridamole is associated with increments in the release of PGI<SUB>2</SUB> from the arterial wall and potentiations of the response of arterial smooth muscle to PGI<SUB>2</SUB>. Dipyridamole appears to increase the production of PGI<SUB>2</SUB> even in the presence of PG synthesis inhibition by aspirin or indomethacin.
- 社団法人 日本薬理学会の論文
著者
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Toda Noboru
Department Of Pharmacology Shiga University Of Medical Science
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Yamamoto Masato
Department Of Cardiology Toho University Ohashi Medical Center
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Yamamoto Masato
Department Of Cardiology Sempo Tokyo Takanawa Hospital
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Yamamoto Masato
Department Of Cadiovascular Surgery Tokyo Women's Medical University Medical Center East
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YAMAMOTO Masato
Department of Pharmacology, Shiga University of Medical Sciences
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TODA Noboru
Department of f Pharmacology, Faculty of Medicine, Kyoto University
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