曹雪涛院士团队发现免疫炎症平衡调控新机制

2018-01-25 唐凤 中国科学报

医学免疫学国家重点实验室主任曹雪涛院士团队发现,DNA修饰酶Tet2分子可以通过调控RNA修饰的新方式,促进机体增加天然免疫细胞的数量和功能,以应对病原体感染及其炎症反应。

医学免疫学国家重点实验室主任曹雪涛院士团队发现,DNA修饰酶Tet2分子可以通过调控RNA修饰的新方式,促进机体增加天然免疫细胞的数量和功能,以应对病原体感染及其炎症反应。该发现不仅从免疫学角度为机体抵抗病原体感染的天然免疫机制提出了新观点,也在表观机制层面揭示了Tet2参与基因表达转录后调控的新模式,为有效防治感染性疾病和控制炎症性疾病提供了新思路和潜在药物研发靶标。

天然免疫系统一旦感知到病原体感染,会马上诱导产生大量天然免疫细胞并通过促发炎症反应以期清除入侵的病原体,但天然免疫与炎症反应是一把双刃剑,过度活化会损伤机体。如何有效适度地平衡调控天然免疫与炎症反应的发生与终止,是免疫学领域的一个重大科学问题。

曹雪涛团队从表观转录组的角度研究了RNA修饰在天然免疫与炎症中的作用,发现DNA羟甲基化酶Tet2能够作为一种RNA结合蛋白作用于免疫分子mRNA水平,进而促进感染状态下机体外周血天然免疫细胞的数量增加,利于病原体的清除。

研究人员利用紫外交联免疫共沉淀结合高通量测序(CLIP-seq)和单个核苷酸分辨率的全转录组RNA甲基化测序等RNA相关组学技术,进一步在分子机制上揭示了Tet2能够直接结合免疫信号通路负调控分子Socs3的mRNA的3`-UTR,并抑制该区域RNA胞嘧啶甲基化,促进了Socs3 mRNA的降解,达到了负负得正的效果,促进了机体在感染早期天然免疫细胞的发生及其功能。

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    2018-02-06 zwjnj2

    好好好好学习学习学习

    0

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    2018-01-25 131****1460

    学习了受益匪浅

    0

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    2018-01-25 happsf

    学习

    0

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