期刊
TOXICOLOGY
卷 242, 期 1-3, 页码 16-22出版社
ELSEVIER IRELAND LTD
DOI: 10.1016/j.tox.2007.09.009
关键词
hydrogen sulfide; hydroxocobalamin; vitamin B-12a; hepatocytes; detoxification
Recently, H2S (an environmental toxin) was proposed to induce cytotoxicity not only by inhibiting cytochrome oxidase but also by generating reactive oxygen species [Truong, D., Eghbal, M., Hindmarsh, W., Roth, Sh., O'Brien, P., 2006. Molecular mechanisms of hydrogen sulfide toxicity. Drug Metab. Rev. 38, 733-744]. In the following, evidence is presented supporting the use of hydroxocobalamin (vitamin B-12a) as an antidote against H2S poisoning. More than 60% of the mice administered 35 mg/kg (0.63 mmol/kg) of NaSH (LD90) survived (at 24 h) when hydroxocobalamin (0.25 mmol/kg) was given after NaSH administration whereas less than 15% of the mice survived without hydroxocobalamin. Hydroxocobalamin (50-100 mu M) or cobalt (50-100 mu M) also prevented hepatocyte cytotoxicity induced by NaSH (500 mu M). Furthermore, adding hydroxocobalamin 60 min later than NaSH still showed some protective activity. Catalytic amounts of hydroxocobalamin or cobalt added to a solution containing NaSH caused the disappearance of NaSH and induced oxygen uptake, indicative of NaSH oxidation and Co reduction, respectively. (C) 2007 Elsevier Ireland Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据