Bradykinin modulates the ouabain-insensitive Na+-ATPase activity from basolateral membrane of the proximal tubule

被引:31
|
作者
Caruso-Neves, C [1 ]
Siqueira, ASE [1 ]
Iso-Cohen, G [1 ]
Lopes, AG [1 ]
机构
[1] Univ Fed Rio de Janeiro, CCS, Inst Biofis Carlos Chagas Filho, BR-21949900 Rio De Janeiro, Brazil
来源
BIOCHIMICA ET BIOPHYSICA ACTA-PROTEIN STRUCTURE AND MOLECULAR ENZYMOLOGY | 1999年 / 1431卷 / 02期
基金
巴西圣保罗研究基金会;
关键词
Na+-ATPase; bradykinin; furosemide; proximal tubule;
D O I
10.1016/S0167-4838(99)00080-1
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
This paper studies the modulation by bradykinin of the ouabain-insensitive Na+-ATPase activity in both renal cortex homogenate and basolateral membrane from proximal tubule. The increase in bradykinin concentration from 10(-14) to 10(-10) M stimulated the ouabain-insensitive Na+-ATPase activity in cortex homogenates about 2.2-fold, but inhibited the enzyme activity of basolateral membrane preparations by 60%. In both preparations, the maximal effect was obtained with 10(-10) M bradykinin. Further increase in the concentration of bradykinin completely abolished these effects. The antagonist of the B-2 receptor, Hyp(3), completely abolished the effect of 10(-10) M bradykinin on the Na+-ATPase activity in the basolateral membrane preparation in a dose-dependent manner, but had no effect on the bradykinin stimulated enzyme activity of the cortex homogenate. Furthermore, in the presence of 10(-7) M Hyp(3), 10(-10) M bradykinin stimulated the Na+-ATPase activity by 45% in the basolateral membrane preparations. The increase in des-Arg(9)-bradykinin concentration from 10(-12) to 10(-7) M, an agonist of the B-1 receptor, stimulated the Na+-ATPase activity of the cortex homogenates and of the basolateral membrane preparations by 105 and 148%, respectively. In the presence of 25 mu M mergetpa, an inhibitor of kininase I, the increase in bradykinin concentration from 10(-12) to 10(-10) M promoted similar inhibition of the Na+-ATPase activity of both cortex homogenates and basolateral membrane preparations. These results suggest that bradykinin stimulated the Na+-ATPase activity of proximal tubule through the interaction with B-1 receptors and inhibited the enzyme through the interaction with B-2 receptors. Furthermore, the cortex homogenate expresses a kininase T activity that cleaves bradykinin to des-Arg(9)-bradykinin. (C) 1999 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:483 / 491
页数:9
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