Interaction of Nitric Oxide and the Renin Angiotensin System in Renal Hypertensive Rats

The Japanese Journal of Pharmacology

Hwa Sup Shin¹  Byung Ho Lee¹ 

[1] Screening and Toxicology Research Center, Korea Research Institute of Chemical Technology

关键词: Nitric oxide;    Renin angiotensin system;    Renal hypertensive rat;    Losartan;    Endothelium;   

DOI  :  10.1254/jjp.74.83

学科分类：药理学

来源: Nihon Yakuri Gakkai Henshuubu / Japanese Pharmacological Society

【 摘 要 】

References(28)Cited-By(2)We investigated the interaction between nitric oxide and the renin angiotensin system in regulating isolated aortic tension and mean arterial pressure in renal hypertensive rats (RHR). Acetylcholine (ACh) relaxed aorta precontracted with norepinephrine from RHR significantly less than that from normotensive rats (NR)(Emax: 34.3% and 86.0%, respectively, PG-nitro-L-arginine methyl ester (L-NAME). ACh lowered the mean arterial pressure slightly less effectively in RHR than in NR (6.8 and 13.0 mmHg, respectively, at 0.1 μg/kg), whereas the depressor effect was reduced by L-NAME (-15.5 and 10.3 mmHg, respectively, at 0.1 μg/kg), but rather enhanced by further treatment with losartan (9.9 (P < 0.05) and 17.3 mmHg, respectively, at 0.1 μg/kg). Angiotensin II induced similar contractile and pressor responses in both RHR and NR, and these effects were significantly enhanced by L-NAME, except for the pressor effect in RHR. L-NAME induced a similar pressor response in RHR and NR (15.9 and 15.2 mmHg, respectively, at 0.1 mg/kg), the effect being decreased by pretreatment with losartan. Losartan induced a depressor response that was smaller in RHR than in NR (34.0 and 48.8 mmHg, respectively, at 0.3 mg/kg), and the response was significantly reduced by L-NAME. These results suggest that nitric oxide interacts with the renin angiotensin system to control the vascular tension and systemic arterial circulation in RHR.

【 授权许可】

Unknown