Effects of KB-2796, a New Diphenylpiperazine Calcium Antagonist, on Renal Hemodynamics and Urine Formation in Anesthetized Dogs

The Japanese Journal of Pharmacology

Keizo Ito¹  Takayuki Sukamoto¹  Takahiro Iwamoto¹  Tominori Morita¹ 

[1] Department of Pharmacology, New Drug Research Laboratories, Kanebo Ltd.

关键词: KB-2796;    Calcium antagonist;    Renal hemodynamics;    Urine formation;    Plasma renin activity;   

DOI  :  10.1254/jjp.59.137

学科分类：药理学

来源: Nihon Yakuri Gakkai Henshuubu / Japanese Pharmacological Society

【 摘 要 】

References(29)Cited-By(1)The effects of KB-2796, a new calcium antagonist with a diphenylpiperazine moiety, on renal hemodynamics and urine formation were investigated in anesthetized dogs. Intravenous infusion of KB-2796 (10, 30, and 100 μg/kg/min) decreased mean blood pressure (MBP) and renal vascular resistance (RVR) in a dose-dependent manner, but did not change renal blood flow (RBF). At the highest dose, glomerular filtration rate (GFR) and urine flow (UF) -tended to decrease. Nicardipine (0.1, 0.3, and 1 μg/kg/min) also dose-dependently decreased MBP, RVR, GFR, and UF. When KB-2796 was infused into the renal artery at lower doses of 3 and 10 μg/kg/min, UF and urinary excretion of electrolytes increased without a significant change in RBF and GFR. Intrarenal infusion of KB-2796 at 30 μg/kg/min and nicardipine at 0.3 μg/kg/min produced a significant increase in GFR, RBF, UF, urinary excretion of electrolytes, and renin secretion rate. These results suggest that KB-2796 administered intrarenally exerts a diuretic action via tubular effects and the alteration of renal hemodynamics. However, its diuretic action might be masked by diminished urine formation via a reflex activation of the sympathetic nerves and/or via a reduction of renal perfusion pressure when it is administered systemically.

【 授权许可】

Unknown