代谢
砒霜主要通过吸入或摄入被吸收,较少程度上通过皮肤接触。然后它被分布到全身,如果需要,它会被还原成亚砷酸盐,然后通过砷酸盐甲基转移酶甲基化成单甲基砷(MMA)和二甲砷酸(DMA)。砒霜及其代谢物主要通过尿液排出。已知砒霜可以诱导金属结合蛋白金属硫蛋白,通过绑定砒霜和其他金属并使它们生物学上不活跃,以及充当抗氧化剂,从而减少砒霜和其他金属的有毒效果。(L20)有机腈通过肝脏细胞色素P450酶的作用转化为氰化物离子。氰化物迅速被吸收并在全身分布。氰化物主要通过罗丹酶或3-巯基丙酸硫转移酶代谢成硫氰酸盐。氰化物代谢物通过尿液排出。(L96)
Arsenic is absorbed mainly by inhalation or ingestion, as to a lesser extent, dermal exposure. It is then distributed throughout the body, where it is reduced into arsenite if necessary, then methylated into monomethylarsenic (MMA) and dimethylarsenic acid (DMA) by arsenite methyltransferase. Arsenic and its metabolites are primarily excreted in the urine. Arsenic is known to induce the metal-binding protein metallothionein, which decreases the toxic effects of arsenic and other metals by binding them and making them biologically inactive, as well as acting as an antioxidant. (L20) Organic nitriles are converted into cyanide ions through the action of cytochrome P450 enzymes in the liver. Cyanide is rapidly absorbed and distributed throughout the body. Cyanide is mainly metabolized into thiocyanate by either rhodanese or 3-mercaptopyruvate sulfur transferase. Cyanide metabolites are excreted in the urine. (L96)
来源:Toxin and Toxin Target Database (T3DB)