Biochemical evaluations of the effects of the sulfhydryl-containing angiotensin-converting enzyme inhibitor (captopril) on the nephrotoxicity induced by doxorubicin in normal rats were carried out. A single dose of doxorubicin (15 mg kg-1) which caused nephrotoxicity was manifested biochemically by the elevation of serum urea after 24 and 48 h of administration. Also a severe decrease in total proteins and albumin after 4, 24 and 48 h was observed. Moreover, a decrease of non-protein sulfhydryl (-SH) concentrations in the kidney tissues after 24 h and an increase in the lipid peroxidation was observed after 4 h administration of doxorubicin. Captopril (60 mg kg-1 i.p.) injection did not induce any change in the biochemical parameters measured, however, captopril administered 1 h before doxorubicin ameliorated the biochemical toxicity induced by doxorubicin. This was evidenced by a significant reduction in serum urea and the lipid peroxidation after 4 and 24 h and a significant reduction in creatinine after 48 h. Also, the captopril amelioration was evidenced by an increase in total proteins and albumin after 4 and 24 h of doxorubicin administration. Captopril did not change non-protein sulfhydryl (-SH) concentrations or protein content in the kidney tissues. These results suggest that captopril may be beneficial as a protective agent against nephrotoxicity induced by doxorubicin.
Copyright 1999 The Italian Pharmacological Society.