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首页> 外文期刊>Journal of biochemical and molecular toxicology >Chronic Cadmium Exposure Lead to Inhibition of Serum and Hepatic Alkaline Phosphatase Activity in Wistar Rats
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Chronic Cadmium Exposure Lead to Inhibition of Serum and Hepatic Alkaline Phosphatase Activity in Wistar Rats

机译:慢性镉暴露导致Wistar大鼠血清和肝碱性磷酸酶活性受到抑制

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摘要

Alkaline phosphatase (ALP) activity in the serum and liver from rats administered with cadmium (Cd) in drinking water was studied. After metal administration, Cd showed a time-dependent accumulation in the liver, meanwhile metallothionein had a maximum increase at 1 month, remaining in this level until the end of the study. On the other hand, serum and liver ALP activity was decreased after 3 months exposure. To determine if Cd produced an inhibition on enzyme, apo-ALP prepared from both nonexposed and exposed rats was reactivated with Zn, showing 60% more activity as compared with the enzyme isolated from nonexposed rats. In vitro assays showed that Cd-ALP was partially reactivated with Zn; however, in the presence of cadmium, Zn-ALP was completely inhibited. Kinetic studies indicate a noncompetitive inhibition by Cd; these results suggest that Cd can substitute Zn, and/or Cd can interact with nucleophilic ligands essential for the enzymatic activity. (C) 2015 Wiley Periodicals, Inc.
机译:研究了饮用水中施用镉(Cd)的大鼠血清和肝脏中碱性磷酸酶(ALP)的活性。施用金属后,镉在肝脏中显示出时间依赖性积累,而金属硫蛋白在1个月时最大增加,一直保持这一水平直至研究结束。另一方面,暴露3个月后血清和肝脏ALP活性降低。为了确定镉是否对酶产生抑制作用,将未暴露和暴露的大鼠制备的载脂蛋白-ALP用Zn重新激活,与从未暴露的大鼠分离的酶相比,其活性提高了60%。体外试验表明,Cd-ALP被Zn部分活化。但是,在镉存在下,Zn-ALP被完全抑制。动力学研究表明,镉具有非竞争性抑制作用。这些结果表明,Cd可以替代Zn,和/或Cd可以与酶活性必不可少的亲核配体相互作用。 (C)2015年Wiley Periodicals,Inc.

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