title: Antioxidant activity of indapamide and its metabolite.
abstract: An antioxidant activity of indapamide (IDP) and its metabolite (OH-IDP) is demonstrated in this study. Both IDP and OH-IDP were found to scavenge 1,1-diphenyl-2-picryl-hydrazyl free radical. The scavenging effect of OH-IDP was stronger than that of IDP. Lipid peroxidation of rat liver microsomes initiated by reduced nicotinamide adenine dinucleotide phosphate (NADPH) and adenosine diphosphate (ADP)-Fe3+ was inhibited by IDP and OH-IDP with IC50 values of about 6 and 2 microM, respectively. The lipid peroxidation in human erythrocyte membrane, induced by 2,2'-azobis-(2-amidinopropane dihydrochloride) treatment, was also inhibited by 10 microM IDP. The antioxidant capacity of OH-IDP was at almost the same level as that of alpha-tocopherol, tested for comparison. The present data show that IDP and OH-IDP at micromolar concentrations are able to trap the free radicals involved in the lipid peroxidation.
authors.affiliation: Department of Biochemistry, Kyoto Pharmaceutical University, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Tamura
authors.forename: T
authors.initials: T
authors.lastname: Sato
authors.forename: T
authors.initials: T
authors.lastname: Fujii
mesh_terms: D000818:Animals; D000975:Antioxidants; D004232:Diuretics / Q000494:pharmacology*; D004910:Erythrocyte Membrane / Q000187:drug effects / Q000378:metabolism; D005609:Free Radicals; D006801:Humans; D066298:In Vitro Techniques; D007190:Indapamide / Q000031:analogs & derivatives / Q000494:pharmacology*; D015227:Lipid Peroxidation / Q000187:drug effects; D008297:Male; D008862:Microsomes, Liver / Q000187:drug effects / Q000378:metabolism; D051381:Rats; D011919:Rats, Inbred Strains; D014810:Vitamin E / Q000494:pharmacology
chemical_list: D000975:Antioxidants; D004232:Diuretics; D005609:Free Radicals; C064096:5-hydroxyindapamide; D014810:Vitamin E; D007190:Indapamide