Effects of NG-Nitro-L-Arginine on Isolated Rabbit Afferent Arterioles

The Japanese Journal of Pharmacology

Shoji Kimura¹  Toshiaki Tamaki¹  Kouichi Hasui¹  Youichi Abe¹  Yasuharu Aki¹ 

[1]Department of Pharmacology, Kagawa Medical School

关键词: Afferent arteriole (isolated);    NG-Nitro-L-arginine;    L-Arginine;    Endothelium-derived relaxing factor;    Nitric oxide;   

DOI  :  10.1254/jjp.62.231

学科分类：药理学

来源: Nihon Yakuri Gakkai Henshuubu / Japanese Pharmacological Society

【 摘 要 】

References(36)Cited-By(6)We examined the effects of NG-nitro-L-arginine (L-NNA) on isolated rabbit afferent arterioles to confirm that nitric oxide is released at the resistance vessel level in the kidney. We microdissected the superficial afferent arterioles from the kidneys of New Zealand White rabbits. Each afferent arteriole was cannulated with a micropipette system, and the intraluminal pressure was set at 80 mmHg. By our methods, we found that norepinephrine (NE) decreased the lumen diameter of the afferent arterioles in a dose-dependent manner, and acetylcholine increased the lumen diameter of NE-constricted afferent arterioles. L-NNA (10-4 M) gradually decreased the lumen diameter of afferent arterioles from 21.5±0.9 to 18.6±0.9 μm in 20 min, but NG-nitro-D-arginine (10-4 M) did not affect them (from 21.8±1.3 to 21.8±1.5 μm). L-Arginine (10-4 M) restored the lumen diameter of L-NNA-contracted afferent arterioles to the control levels. These findings indicate that the isolated afferent arteriole has the ability to release or to synthesize and release nitric oxide under basal conditions and that this basal release of nitric oxide plays an important role in the basal tone of the afferent arteriole.

【 授权许可】

Unknown