Cell Host&Microbe:一种抗菌蛋白+维生素A,才能有效抵御皮肤细菌感染

2019-05-26 佚名 中国生物技术网

众所周知,饮食中缺乏维生素A的人更容易导致皮肤感染,然而维生素A调节皮肤免疫力的机制仍然是个谜。近日发表在《Cell Host&Microbe》上的一项研究中,美国德克萨斯大学西南分校(UTSW)的研究人员通过确定表皮上一种过去未知的抗菌蛋白来揭示了这一谜团——它需要维生素A才能发挥作用。美国国立卫生研究院(NIH)的科学家们也参与了这项研究。研究人员发现,抵抗素样分子(RELM)家族中的

众所周知,饮食中缺乏维生素A的人更容易导致皮肤感染,然而维生素A调节皮肤免疫力的机制仍然是个谜。近日发表在《Cell Host&Microbe》上的一项研究中,美国德克萨斯大学西南分校(UTSW)的研究人员通过确定表皮上一种过去未知的抗菌蛋白来揭示了这一谜团——它需要维生素A才能发挥作用。美国国立卫生研究院(NIH)的科学家们也参与了这项研究。

研究人员发现,抵抗素样分子(RELM)家族中的一种蛋白质RELMα可以作为抗生素迅速杀死细菌。小鼠和人体内的RELMα都需要被饮食中的维生素A激活。

该研究通讯作者、宿主防御遗传学中心研究员、免疫学和微生物学教授Lora Hooper博士说:“RELMα是首个需要膳食维生素A才能杀死细菌的抗菌蛋白质。这一发现为我们提供了一个重要线索,让我们了解皮肤如何抵御感染,以及饮食如何调节皮肤防御功能。”

皮肤科医生通常使用名为维甲酸(retinoid)的合成维生素A来治疗痤疮、牛皮癣和其他皮肤疾病,但研究人员对药物如何起效却知之甚少。

研究第一作者、临床科学家、皮肤学和免疫学助理教授Tamia Harris-Tryon博士说:“皮肤是人体最大的保护屏障。如果皮肤的免疫出问题就会导致感染。因链球菌等细菌导致的感染是临床最常见的皮肤感染。”

Hooper博士以研究肠道中的共生菌或有益菌而闻名,这些细菌有助于消化和防止感染。

研究团队使用人类组织和小鼠进行的实验阐明了饮食与皮肤先天免疫力之间一种过去未被发现的关联,解释了为什么维生素A衍生物能够有效治疗皮肤病。

除了确定RELMα的独特性(需要维生素A激活以杀死细菌)外,该团队发现,喂养缺乏维生素A饮食的小鼠不会产生RELMα。研究人员还发现,缺失RELMα的小鼠更易受到感染,而且与典型小鼠相比,它们皮肤上的细菌类型也不同。

Harris-Tryon博士补充说:“考虑到维甲酸经常被用于皮肤治疗,所以我们取得的发现意义重大。皮肤是我们与环境之间的重要屏障,它保护我们免受感染和炎症。我们才刚刚开始理解细菌和微生物组是如何影响牛皮癣和痤疮等皮肤病的。我们的研究有助于确定皮肤用于在微生物群和宿主之间建立健康关系的分子。”

为了研究微生物组如何影响免疫,研究人员们使用了Hooper博士的无菌小鼠,并确定了这些小鼠暴露细菌时开启的基因。

她解释说:“当皮肤遇到细菌时,细胞通过制造有助于保护皮肤免受感染的分子来做出反应。”

研究人员也提出了一些警告。Harris-Tryon博士说:“这项研究使我们更好地理解饮食如何影响皮肤抵御细菌感染的能力,但我们还需要更多的研究来确定这些发现将如何影响患有痤疮和牛皮癣等炎症性皮肤病的患者。”

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    2019-06-15 xjy02
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    2019-10-08 维他命
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    2019-05-28 wwzzly
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    2019-05-26 tony1234

    学习了

    0

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    2019-05-26 1ddf0692m34(暂无匿称)

    学习了,长知识

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