Abrogation of potassium bromate-induced renal oxidative stress and subsequent cell proliferation response by soy isoflavones in Wistar rats.
Potassium bromate (KBrO3) is a potent nephrotoxic agent. In this study, we show the modulatory effect of soy isoflavones on KBrO3-mediated renal oxidative stress and subsequent cell proliferation response in Wistar rats. KBrO3 (125 mg/kg body weight, intraperitoneally) caused reduction in renal glutathione content, activities of renal anti-oxidant enzymes, viz., glutathione peroxidase, glutathione reductase, catalase, glucose-6-phosphate dehydrogenase and phase-II metabolising enzymes such as glutathione-S-transferase and quinone reductase with enhancement in xanthine oxidase, lipid peroxidation, gamma-glutamyl transpeptidase and hydrogen peroxide (H2O2). KBrO3 treatment also induced blood urea nitrogen, serum creatinine and tumor promotion markers, viz., ornithine decarboxylase (ODC) activity and thymidine [3H] incorporation into renal DNA. Treatment of rats orally with soy isoflavones (5 mg/kg body weight and 10 mg/kg body weight) resulted in a significant decrease in xanthine oxidase (P < 0.05), lipid peroxidation, gamma-glutamyl transpeptidase, H2O2 generation, blood urea nitrogen, serum creatinine, renal ODC activity and DNA synthesis (P < 0.001). There was also significant recovery of renal glutathione content (P < 0.01), anti-oxidant enzymes and phase-II metabolising enzymes (P < 0.001). Thus, our results show that soy isoflavones acts as potent chemopreventive agent against KBrO3-mediated renal oxidative stress, toxicity and subsequent cell proliferation response in Wistar rats.
Khan
Naghma
N
Section of Chemoprevention and Nutrition Toxicology, Department of Medical Elementology and Toxicology, Faculty of Science, Jamia Hamdard (Hamdard University), New Delhi 110062, India.
Sultana
Sarwat
S
D000818:Animals; D001959:Bromates / Q000037:antagonists & inhibitors / Q000633:toxicity*; D002273:Carcinogens / Q000037:antagonists & inhibitors / Q000633:toxicity*; D004247:DNA / Q000096:biosynthesis; D005260:Female; D007529:Isoflavones / Q000627:therapeutic use*; D007668:Kidney / Q000187:drug effects* / Q000201:enzymology / Q000378:metabolism; D015227:Lipid Peroxidation / Q000187:drug effects*; D018384:Oxidative Stress / Q000187:drug effects*; D051381:Rats; D017208:Rats, Wistar; D030262:Soybean Proteins / Q000627:therapeutic use*
D001959:Bromates; D002273:Carcinogens; D007529:Isoflavones; D030262:Soybean Proteins; C019536:potassium bromate; D004247:DNA