AJP - Regulatory, Integrative and Comparative Physiology, Vol 272, Issue 2 514-R518, Copyright © 1997 by American Physiological Society

ARTICLES

Enalapril and captopril enhance antioxidant defenses in mouse tissues

E. M. de Cavanagh, C. G. Fraga, L. Ferder and F. Inserra
Department of Physical Chemistry, School of Pharmacy and Biochemistry, University of Buenos Aires, Argentina.

This study was conducted to investigate a possible systemic effect of angiotensin-converting enzyme inhibitors (ACEi) on tissue antioxidant defenses. CF1 mice (4-mo-old females) were administered either water (control) or water containing enalapril (20 mg/l) or captopril (50 mg/l) during 11 wk. Neither enalapril nor captopril treatment had an effect on body mass or brain, kidney, or heart weight relative to controls. CuZn-superoxide dismutase (SOD) activity was increased by enalapril treatment in kidney medulla (27%), heart (24%), and erythrocytes (19%) and by captopril treatment in kidney medulla (43%) and heart (54%) relative to controls. Mn-SOD and catalase activities were unaffected by either treatment. Enalapril, but not captopril treatment, increased Se-glutathione peroxidase activity in renal medulla (19%). Nonenzymatic antioxidant defenses, evaluated by tert-butyl hydroperoxide-initiated chemiluminescence (HICL), were enhanced in kidney cortex (48%) by enalapril and in brain by enalapril (44%) or captopril (36%) treatment relative to controls. As evaluated in vitro by HICL and thiobarbituric acid-reactive substances formation, captopril had a free radical scavenger activity, whereas neither enalapril nor lisinopril was effective. These results suggest that ACEi may protect tissues from oxidative damage by increasing enzymatic and nonenzymatic antioxidant defenses.

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