代谢
锌可以通过肺部、皮肤和胃肠消化道进入人体。肠道对锌的吸收由锌载体蛋白CRIP控制。锌还与金属硫蛋白结合,有助于防止过量锌的吸收。锌在体内广泛分布,存在于所有组织和组织液中,尤其在肝脏、胃肠道、肾脏、皮肤、肺、大脑、心脏和胰腺中含量较高。在血液中,锌与红细胞中的碳酸酐酶结合,也与血浆中的白蛋白、α2-巨球蛋白和氨基酸结合。白蛋白和氨基酸结合的锌可以扩散穿过组织膜。锌通过尿液和粪便排出体外。锑在体内广泛分布。头发和皮肤含有最高水平的锑。肾上腺、肺、大肠、气管、小脑和肾脏也含有相对较高水平的锑。血液是将吸收的锑运输到体内各个组织隔室的主要载体。锑是一种金属,因此不经历分解代谢。锑可以与巯基和磷酸共价相互作用,以及与内源性配体(例如蛋白质)发生许多可逆的结合相互作用。目前尚不清楚这些相互作用在毒理学上是否具有重要意义。锑通过尿液和粪便排出体外。一些粪便中的锑可能代表未被吸收的锑,通过粘膜纤毛活动从肺部清除到食管,然后进入胃肠道。(L741,L49)
Zinc can enter the body through the lungs, skin, and gastrointestinal tract. Intestinal absorption of zinc is controlled by zinc carrier protein CRIP. Zinc also binds to metallothioneins, which help prevent absorption of excess zinc. Zinc is widely distributed and found in all tissues and tissues fluids, concentrating in the liver, gastrointestinal tract, kidney, skin, lung, brain, heart, and pancreas. In the bloodstream zinc is found bound to carbonic anhydrase in erythrocytes, as well as bound to albumin, _2-macroglobulin, and amino acids in the the plasma. Albumin and amino acid bound zinc can diffuse across tissue membranes. Zinc is excreted in the urine and faeces. Antimony is widely distributed throughout the body. The hair and skin contain the highest levels of antimony. The adrenal glands, lung, large intestine, trachea, cerebellum, and kidneys also contain relatively high levels of antimony. Blood is the main vehicle for the transport of absorbed antimony to various tissue compartments of the body. Antimony is a metal and, therefore, does not undergo catabolism. Antimony can covalently interact with sulfhydryl groups and phosphate, as well as numerous reversible binding interactions with endogenous ligands (e.g., proteins). It is not known if these interactions are toxicologically significant. Antimony is excreted via the urine and feces. Some of the fecal antimony may represent unabsorbed antimony that is cleared from the lung via mucociliary action into the esophagus to the gastrointestinal tract. (L741, L49)
来源:Toxin and Toxin Target Database (T3DB)