title: Kolaviron modulates cellular redox status and impairment of membrane protein activities induced by potassium bromate (KBrO(3)) in rats.
abstract: In this study, we examined the modulatory effects of kolaviron, a biflavonoid from Garcinia kola seeds on the antioxidant defense mechanisms, cellular redox status and oxidative stress in the kidney and liver of rats pretreated with potassium bromate (KBrO(3)) intragastrically as a single dose of 300 mg kg(-1)weight for 4 weeks. Treatment of rats with KBrO(3)resulted in an insignificant difference (P> 0.05) in body weight compared to controls. However, a significant increase in kidney/body weight ratio (P< 0.001) was observed in rats treated with KBrO(3)while liver/body weight ratio was not affected. KBrO(3)depressed the activities of superoxide dismutase, glutathione peroxidase and catalase (P< 0.001) in the kidney but not in the liver. Kolaviron (200 mg kg(-1)body weight) administered three times a week for 4 weeks inhibited the decrease mediated by KBrO(3)of these enzymes in the kidney by 29, 88 and 45%, respectively. Similarly, kolaviron reduced the KBrO(3)-induced decrease in the activities of gamma -glutamyltransferase and microsomal Ca(2+)ATPase by 73 and 63% in the kidney. In addition, the extract elicited a 27 and 25% decrease in the KBrO(3)-induced increase in malondialdehyde and lipid hydroperoxide formation in the kidney. Kolaviron also attenuated the KBrO(3)-decreased activities of glucose 6-phosphatase, 5 prime prime or minute nucleotidase and alkaline phosphatase (membrane enzymes) by 72, 57 and 25% respectively. The results of the present investigation indicate the antioxidative effect of kolaviron, a natural antioxidant, on drug-induced kidney toxicity. Kolaviron may therefore intervene in the cellular redox status and depression of membrane protein activities caused by KBrO(3)and other environmental carcinogens in the kidney.
authors.affiliation: Drug Metabolism and Toxicology Research Laboratories, Department of Biochemistry, University of Ibadan, Ibadan, Nigeria. ofarombi@ibadan.skannet.com
authors.forename: E Olaunde
authors.initials: EO
authors.lastname: Farombi
authors.forename: Modupe C
authors.initials: MC
authors.lastname: Alabi
authors.forename: Temitope O
authors.initials: TO
authors.lastname: Akuru
mesh_terms: D000469:Alkaline Phosphatase / Q000187:drug effects / Q000378:metabolism; D000818:Animals; D001959:Bromates / Q000494:pharmacology; D000252:Calcium-Transporting ATPases / Q000187:drug effects / Q000378:metabolism; D002374:Catalase / Q000187:drug effects / Q000378:metabolism; D004347:Drug Interactions; D005419:Flavonoids / Q000737:chemistry / Q000494:pharmacology*; D029763:Garcinia kola; D005952:Glucose-6-Phosphatase / Q000187:drug effects / Q000378:metabolism; D005978:Glutathione / Q000187:drug effects / Q000378:metabolism; D007668:Kidney / Q000187:drug effects / Q000378:metabolism; D015227:Lipid Peroxidation / Q000187:drug effects; D008297:Male; D008315:Malondialdehyde / Q000378:metabolism; D008565:Membrane Proteins / Q000378:metabolism*; D008862:Microsomes, Liver / Q000187:drug effects / Q000378:metabolism; D010084:Oxidation-Reduction / Q000187:drug effects; D018384:Oxidative Stress / Q000187:drug effects; D010936:Plant Extracts / Q000494:pharmacology*; D051381:Rats; D017208:Rats, Wistar; D013482:Superoxide Dismutase / Q000187:drug effects / Q000378:metabolism
chemical_list: D001959:Bromates; D005419:Flavonoids; D008565:Membrane Proteins; D010936:Plant Extracts; C019536:potassium bromate; D008315:Malondialdehyde; D002374:Catalase; D013482:Superoxide Dismutase; D000469:Alkaline Phosphatase; D005952:Glucose-6-Phosphatase; D000252:Calcium-Transporting ATPases; D005978:Glutathione; C045492:kolaviron