Biosafety of flavonoids in rats: effects on copper and zinc homeostasis and interaction with low-level pesticide exposure.
Two 30-day experiments (36 male Sprague-Dawley rats each) were conducted to determine effect of administering flavonoid mixture (FM) with concomitant exposure to a pesticide mixture (PM) or FM at varied levels on changes in concentrations of zinc and copper in tissues. In experiment 1, PM = chlorpyrifos, endosulfan, and thiram at 25% LD(50) was dissolved in soybean (SB) oil and gavage-fed 0.1 mL 5 days/week; FM in SB oil was mixed in AIN-93M diet at 1.0 and 5.0 mM/kg diet and fed ad libitum. The groups were Control (CON), PM, FM1, FM5, PM+FM1, and PM+FM5. In experiment 2, FM in 1% polyethylene glycol was gavage-fed (0.5 mL/5 days/week), at increasing levels(mg/kg body weight); the groups were CON, FM5, FM25, FM50, FM100, and FM200. In experiment 1, PM plus FM increased tissue Cu as compared to the CON by: plasma, 16-37%; liver, 9-20%; kidney, 13-41%; small intestinal mucosa (IM), 41%; and small intestines (SI), 77%. In experiment 2, FM fed at higher levels decreased tissue Cu by: plasma, 22-36%; liver, 23%; kidney, 24-44%; IM, 17-26%; and SI, 58% and 77%, as compared to respective CON. Kidney zinc increased at higher concentrations of FM by 14-34%. These results indicate that flavonoids can modify copper homeostasis depending on whether they are fed in the diet or by gavage.
Bebe
Frederick N
FN
Nutrition and Health Program, Kentucky State University, Frankfort, KY 40601, USA. frederick.bebe@kysu.edu
Panemangalore
Myna
M
D000821:Animal Feed; D000818:Animals; D003300:Copper / Q000097:blood / Q000378:metabolism*; D005419:Flavonoids / Q000008:administration & dosage / Q000494:pharmacology*; D006706:Homeostasis / Q000187:drug effects*; D008297:Male; D010575:Pesticides / Q000494:pharmacology*; D051381:Rats; D017207:Rats, Sprague-Dawley; D015032:Zinc / Q000097:blood / Q000378:metabolism*
D005419:Flavonoids; D010575:Pesticides; D003300:Copper; D015032:Zinc