Effect of spironolactone and captopril on nitric oxide and S-nitrosothiol formation in kidney of L-NAME-treated rats.

Abstract:

:Although angiotensin-converting enzyme (ACE) inhibitors are well-established drugs in the treatment of hypertension, they are not supposed to be sufficient in the inhibition of aldosterone formation. The present study analyzes the effect of aldosterone receptor antagonist, spironolactone and ACE inhibitor, captopril on nitric oxide (NO) and S-nitrosothiol formation in the kidney of N(G)-nitro-L-arginine methyl ester (L-NAME)-treated rats. Male Wistar rats were divided into six groups: (1) controls, (2) L-NAME (40 mg/kg/day), (3) spironolactone (200 mg/kg/day), (4) captopril (100 mg/kg/day), (5) L-NAME+spironolactone, and (6) L-NAME+captopril. After 4 weeks, NO synthase (NOS) activity, protein expression of endothelial NOS, inducible NOS and concentration of thiol and S-nitrosothiol groups were determined in the kidney. Besides the increase in systolic blood pressure (by 32%) and the decrease in NOS activity (by 37%), L-NAME treatment lowered the concentration of thiols (by 32%) and S-nitrosothiols (by 36%) in the renal tissue. Simultaneous treatment with spironolactone preserved NOS activity and S-nitrosothiols on the control level, whereas captopril did not affect these parameters modified by L-NAME treatment. Moreover, spironolactone increased expression of endothelial NOS protein without affecting inducible NOS protein expression. In conclusion, both captopril and spironolactone prevented L-NAME-induced hypertension and the decline of the antioxidant potential of the kidney tissue. However, only spironolactone improved NOS activity which led to the S-nitrosothiols formation. Both NO itself and S-nitrosothiols may contribute to the preventive effect of spironolactone against development of L-NAME-induced hypertension.

journal_name

Kidney Int

journal_title

Kidney international

authors

Pechanova O,Matuskova J,Capikova D,Jendekova L,Paulis L,Simko F

doi

10.1038/sj.ki.5001513

subject

Has Abstract

pub_date

2006-07-01 00:00:00

pages

170-6

issue

1

eissn

0085-2538

issn

1523-1755

pii

S0085-2538(15)51754-7

journal_volume

70

pub_type

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