Suppressive effect of accumulated aluminum trichloride on the hepatic microsomal cytochrome P450 enzyme system in rats.
Aluminum (Al) is a low toxicological metal and can accumulate in the liver. The hepatic microsomal cytochrome P450 enzyme system (CYPS) plays important role in the transformation of the toxic materials. It is not clear if the CYPS is affected by Al exposure. Thus, the aim of this study is to investigate the effects of aluminum trichloride (AlCl(3)) on CYPS in rats. Forty male Wistar rats (5weeks old) weighing 110-120g were randomly allocated and orally exposed to 0, 64.18, 128.36 and 256.72mg/kg body weight (BW) AlCl(3) in drinking water for 120days. The body weight (BW) of rats, hepatosomatic index (HSI), hepatic Al content, the concentrations of cytochrome P450 (CYP450), cytochrome B5 (B5), microsomal protein and the activities of NADPH-cytochrome c reductase (CR), aminopyrin N-demethylase (AND), erythromycin N-demethylase (ERND) and aniline-4-hydeoxylase (AH) were assessed at the end of the experiment. The results showed that the increase in Al concentration decreased BW, HIS, concentrations of CYP450, B5, microsomal protein and the activity of CR, AND, ERND and AH in hepatic microsomes. The results revealed that exposure to AlCl(3) inhibited the microsomal CYP450 dependent enzyme system of liver. Our findings suggest that long term daily exposure of AlCl(3) exerts the suppressive effects and thus may cause dysfunction of hepatic CYP450 dependent enzyme system of rat.
Institute of Special Animal and Plant Sciences, Chinese Academy of Agricultural Sciences, Changchun 130112, China.
Yanzhu
Y
Zhu
Yanfei
Y
Han
Hansong
H
Zhao
Jing
J
Li
Chongwei
C
Hu
Yanfei
Y
Li
Zhigang
Z
Zhang
D000077410:Aluminum Chloride; D017607:Aluminum Compounds / Q000633:toxicity*; D000818:Animals; D001835:Body Weight / Q000187:drug effects; D002712:Chlorides / Q000633:toxicity*; D003577:Cytochrome P-450 Enzyme System / Q000378:metabolism*; D015786:Cytochromes b5 / Q000378:metabolism; D060766:Drinking Water / Q000737:chemistry; D004785:Environmental Pollutants / Q000633:toxicity; D008099:Liver / Q000187:drug effects* / Q000378:metabolism*; D008297:Male; D008862:Microsomes, Liver / Q000187:drug effects / Q000378:metabolism; D051381:Rats; D017208:Rats, Wistar
D017607:Aluminum Compounds; D002712:Chlorides; D060766:Drinking Water; D004785:Environmental Pollutants; D000077410:Aluminum Chloride; D015786:Cytochromes b5; D003577:Cytochrome P-450 Enzyme System