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Nature:食品乳化剂的有害影响

摘要 : 非遗传因素是肠炎和代谢综合征等炎症发病的重要贡献因素。本文作者发现,吃含乳化剂食物的小鼠会患轻度炎症和肥胖/代谢综合征。这些症状与肠道微生物群-上皮组织之间的距离因粘膜层的降解而减小、以及微生物群组成和促炎潜力的改变有关。

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非遗传因素是肠炎和代谢综合征等炎症发病的重要贡献因素。本文作者发现,吃含乳化剂食物的小鼠会患轻度炎症和肥胖/代谢综合征。这些症状与肠道微生物群-上皮组织之间的距离因粘膜层的降解而减小、以及微生物群组成和促炎潜力的改变有关。

乳化剂是人类饮食中常见食物添加剂,这些发现表明,需要就它们对肠道微生物群和人体健康的潜在影响做进一步研究。

原文链接:Dietary emulsifiers impact the mouse gut microbiota promoting colitis and metabolic syndrome

The intestinal tract is inhabited by a large and diverse community of microbes collectively referred to as the gut microbiota. While the gut microbiota provides important benefits to its host, especially in metabolism and immune development, disturbance of the microbiota–host relationship is associated with numerous chronic inflammatory diseases, including inflammatory bowel disease and the group of obesity-associated diseases collectively referred to as metabolic syndrome. A primary means by which the intestine is protected from its microbiota is via multi-layered mucus structures that cover the intestinal surface, thereby allowing the vast majority of gut bacteria to be kept at a safe distance from epithelial cells that line the intestine. Thus, agents that disrupt mucus–bacterial interactions might have the potential to promote diseases associated with gut inflammation. Consequently, it has been hypothesized that emulsifiers, detergent-like molecules that are a ubiquitous component of processed foods and that can increase bacterial translocation across epithelia in vitro, might be promoting the increase in inflammatory bowel disease observed since the mid-twentieth century. Here we report that, in mice, relatively low concentrations of two commonly used emulsifiers, namely carboxymethylcellulose and polysorbate-80, induced low-grade inflammation and obesity/metabolic syndrome in wild-type hosts and promoted robust colitis in mice predisposed to this disorder. Emulsifier-induced metabolic syndrome was associated with microbiota encroachment, altered species composition and increased pro-inflammatory potential. Use of germ-free mice and faecal transplants indicated that such changes in microbiota were necessary and sufficient for both low-grade inflammation and metabolic syndrome. These results support the emerging concept that perturbed host–microbiota interactions resulting in low-grade inflammation can promote adiposity and its associated metabolic effects. Moreover, they suggest that the broad use of emulsifying agents might be contributing to an increased societal incidence of obesity/metabolic syndrome and other chronic inflammatory diseases.

对应Nature杂志: 2015年3月5日Nature杂志精选

来源: Nature 浏览次数:195

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