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.
Section of Chemoprevention and Nutrition Toxicology, Department of Medical Elementology and Toxicology, Faculty of Science, Jamia Hamdard (Hamdard University), New Delhi 110062, India.
Naghma
N
Khan
Sarwat
S
Sultana
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