Cell Host & Microbe:良好的肠道关系或帮助抵御病原体入侵

2016-06-30 佚名 生物谷

抵抗肠道感染需要依赖肠道壁和肠道微生物细胞之间的动态关系,数百种不同的细菌和微生物共存于人体中并对人体无损害。这项研究揭示了当肠道上皮细胞产生的早期警报信号失效并威胁到机体第一道防线时,微生物如何适应特殊的补偿机制。 活性氧(ROS)是来源于氧气的活性化学分子。当白细胞重新吸收病原菌后超氧化物和相关化合物90就会杀死它们。ROS也会从肠道壁上皮释放出来用以处理病原体。如果体内RO


抵抗肠道感染需要依赖肠道壁和肠道微生物细胞之间的动态关系,数百种不同的细菌和微生物共存于人体中并对人体无损害。这项研究揭示了当肠道上皮细胞产生的早期警报信号失效并威胁到机体第一道防线时,微生物如何适应特殊的补偿机制。

活性氧(ROS)是来源于氧气的活性化学分子。当白细胞重新吸收病原菌后超氧化物和相关化合物90就会杀死它们。ROS也会从肠道壁上皮释放出来用以处理病原体。如果体内ROS水平降低的话防御系统就会崩溃,随后身体就会更容易受到病原菌感染。这就增加了儿童患克罗恩病以及某些严重的溃疡性结肠炎的风险。研究已证明危及生命的感染能够引起严重的免疫障碍。

都柏林大学教授Ulla Knaus以及研究人员研究分析了促成肠道中产生活性氧的酶。当研究人员在实验室中去除里这些酶时,他们发现即便微生物群中发生了变化,小鼠仍然能免受感染。大量分泌过氧化氢的微生物群(如乳酸杆菌)会起一定的防御作用。

“我们的研究结果表明,上皮细胞ROS对我们的肠道微生物群的构成是至关重要的,反过来,这个微生物群的特定细菌可以保护身体免受肠道病原体侵袭。” Knaus教授说。

乳酸杆菌被认为是‘好’的细菌模型,它在人类宿主中逐渐进化并有抗炎作用等好处。然而,这些在人类宿主和共生体之间的互利关系可被富含脂肪和糖的饮食破坏。如果我们能恢复肠道细菌的种类并且保持稳定的互利关系,我们就可以保护身体免受肠道疾病的危害。

原始出处:

Pircalabioru G, Aviello G, Kubica M, Zhdanov A, Paclet MH, Brennan L, Hertzberger R, Papkovsky D, Bourke B, Knaus UG.Defensive Mutualism Rescues NADPH Oxidase Inactivation in Gut Infection.Cell Host Microbe. 2016 May 11;19(5):651-63. doi: 10.1016/j.chom.2016.04.007.

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    2017-05-20 维他命
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    2017-05-28 xjy02
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    2016-09-11 1e10c84am36(暂无匿称)

    己拜读,受益匪浅

    0

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