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首页> 外文期刊>Journal of biochemical and molecular toxicology >Chronic Exposure to Low-Dose Arsenic Modulates Lipogenic Gene Expression in Mice
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Chronic Exposure to Low-Dose Arsenic Modulates Lipogenic Gene Expression in Mice

机译:长期暴露于低剂量砷可调节小鼠致脂基因的表达

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摘要

Arsenic, a ubiquitous environmental toxicant, can affect lipid metabolism through mechanisms that are not well understood. We studied the effect of arsenic on serum lipids, lipid-regulating genes, and transcriptional regulator sterol regulatory element binding protein 1c (SREBP-1c). C57BL/6 mice were administered 0 or 100 ppb sodium arsenite in drinking water for 5 weeks. Arsenic exposure was associated with decreased liver weight but no change in body weight. Serum triglycerides level fell in arsenic-exposed animals, but not in fed animals, after short-term fasting. Hepatic expression of SREBP-1c was reduced in arsenic-exposed fed animals, with a 16-fold change in reduction. Similar effects were seen for SREBP-1c in white adipose tissue. However, fasting resulted in dissociation of the expression of SREBP-1c and its targets, and SREBP-1c protein content could not be shown to correlate with its mRNA expression. We conclude that arsenic modulates hepatic expression of genes involved in lipid regulation through mechanisms that are independent of SREBP-1c expression.
机译:砷是一种普遍存在的环境毒物,它可能通过尚不了解的机制影响脂质代谢。我们研究了砷对血清脂质,脂质调节基因和转录调节固醇调节元件结合蛋白1c(SREBP-1c)的影响。向C57BL / 6小鼠在饮用水中施用0或100 ppb的亚砷酸钠,持续5周。砷暴露与肝脏重量减少但体重无变化有关。短期禁食后,砷暴露动物的血清甘油三酯水平下降,但喂食动物的血清甘油三酯水平并未下降。在患有砷的喂养动物中,SREBP-1c的肝表达降低,降低幅度为16倍。在白色脂肪组织中,SREBP-1c的作用相似。然而,禁食导致SREBP-1c及其靶标的表达解离,并且SREBP-1c蛋白含量未显示与其mRNA表达相关。我们得出结论,砷通过独立于SREBP-1c表达的机制来调节参与脂质调节的基因的肝表达。

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