Captopril and quinapril reduce reactive oxygen species.

Abstract:

BACKGROUND:Angiotensin-converting enzyme inhibitors may affect reactive oxygen species in humans in vitro and in vivo. In the present study we evaluated whether angiotensin-converting enzyme inhibitors may affect NAD(P)H oxidase activity. MATERIALS AND METHODS:The production of reactive oxygen species was measured spectrophotometrically in mononuclear leukocytes using the fluorescent dye, dichlorofluorescein diacetate. The effects of quinaprilat, captopril, enalaprilat and lisinopril on phorbol myristate acetate-induced reactive oxygen species generation were investigated in vitro. The effects of quinaprilat, captopril, enalaprilat and lisinopril on the NAD(P)H oxidase activity of the mononuclear leukocytes were measured photometrically. In addition, reactive oxygen species were measured before and 4 h after oral administration of quinapril. RESULTS:In vitro, the addition of quinaprilat (72 +/- 6% of control; mean +/- SEM; n= 19; P < 0.001) and captopril (48 +/- 2% of control; n= 19; P < 0.001) significantly reduced the phorbol-12-myristate-13-acetate-induced reactive oxygen species generation by the mononuclear leukocytes, whereas enalaprilat and lisinopril showed no effect. The effect of captopril on phorbol-12-myristate-13-acetate-induced reactive oxygen species generation in vitro was concentration-dependent. Quinaprilat and captopril significantly inhibited the NAD(P)H oxidase activity. After the oral administration of 10 mg of quinapril the phorbol-12-myristate-13-acetate-induced reactive oxygen species generation by the mononuclear leukocytes was significantly decreased from 1981 +/- 292% to 988 +/- 141% (n = 14; P < 0.01). CONCLUSION:Quinapril and captopril decrease the production of reactive oxygen species.

journal_name

Eur J Clin Invest

authors

van der Giet M,Erinola M,Zidek W,Tepel M

doi

10.1046/j.1365-2362.2002.01064.x

keywords:

subject

Has Abstract

pub_date

2002-10-01 00:00:00

pages

732-7

issue

10

eissn

0014-2972

issn

1365-2362

pii

1064

journal_volume

32

pub_type

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