Effects of Angiotensin II on Isolated Rabbit Afferent Arterioles.
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概要
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We examined the effects of angiotensin II (Ang II) on isolated rabbit afferent arterioles to assess the direct effect of Ang II at the resistance vessel level in the kidney. We microdissected the superficial afferent arteriole from the kidney of New Zealand White rabbits. The afferent arteriole was cannulated with a micropipette system, and the intraluminal pressure was set at 80 mmHg. Ang II did not change the lumen diameter of the afferent arterioles. After the afferent arterioles were pretreated with aspirin DL-lysine or indomethacin, Ang II (10<SUP>-7</SUP> M) caused transient vasoconstriction in the afferent arterioles. Ang II (10<SUP>-7</SUP> M) caused persistent constriction in the afferent arterioles pretreated with <I>N<SUP>G</SUP></I>-nitro-L-arginine (10<SUP>-4</SUP> M). Physiological doses of Ang II decresed the lumen diameter of the isolated afferent arterioles pretreated with <I>N<SUP>G</SUP></I>-nitro-L-arginine and aspirin DL-lysine. Dup753 (10<SUP>-6</SUP> M), an AT1-receptor antagonist, abolished the vasoconstrictor effects of Ang II. These findings suggest that the isolated rabbit afferent arteriole has AT1 receptors, and the vasoconstrictor response of Ang II is counteracted by vasodilatory prostaglandins and nitric oxide.
- 公益社団法人 日本薬理学会の論文
著者
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Tamaki Toshiaki
Department Of Pharmacology Kagawa Medical School
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Kimura Shoji
Department Of Agricultural Chemistry Faculty Of Agriculture Utsunomiya University
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Abe Youichi
Department Of Pharmacology Kagawa Medical University
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Takenaka Ikumasa
Department Of Urology Kagawa Medical School
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AKI Yasuharu
Department of Pharmacology, Kagawa Medical School
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Yoshida Hiroyuki
Department of Chemical Engineerig, University of Osaka Prefecture
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Yoshida Hiroyuki
Department of Urology, Kagawa Medical School
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