Hepatology:肝脏mtDNA-TLR9-microRNA-223负向调节系统

2017-03-30 MedSci MedSci原创

世界范围内,过量使用对乙酰氨基酚是导致急性肝衰的主要原因。在这之中,损伤的肝脏细胞释放线粒体DNA(mtDNA)通过结合TLR9激活中性粒细胞,进一步加重肝脏损伤。本次研究证实,mtDNA/TLR9也可通过介导microRNA-233激活负向调节通路,限制中性粒细胞过度激活和肝脏损伤。在小鼠注射对乙酰氨基酚后,miR-233(中性粒细胞中大量表达)水平高度升高。降低miR-233表达可加重对乙酰氨

世界范围内,过量使用对乙酰氨基酚是导致急性肝衰的主要原因。在这之中,损伤的肝脏细胞释放线粒体DNA(mtDNA)通过结合TLR9激活中性粒细胞,进一步加重肝脏损伤。

本次研究证实,mtDNA/TLR9也可通过介导microRNA-233激活负向调节通路,限制中性粒细胞过度激活和肝脏损伤。在小鼠注射对乙酰氨基酚后,miR-233(中性粒细胞中大量表达)水平高度升高。降低miR-233表达可加重对乙酰氨基酚介导的肝脏中性粒细胞浸润、氧化应激、肝脏损伤,增强中性粒细胞TLR9受体介导的前炎症介质的激活。在miR-233基因敲除小鼠中额外敲除细胞内粘附分子1(ICAM-1)基因可减轻对乙酰氨基酚介导的中性粒细胞浸润及肝脏损伤。

体外实验揭示miR-233缺陷的中性粒细胞对TLR9激动剂介导的前炎症介质和NF-κB通路更敏感,相反,过表达miR-233可减弱中性粒细胞的这些反应。此外,通过TLR9抑制剂或降低TLR9基因表达可显着抑制对乙酰氨基酚注射后的中性粒细胞miR-233的表达。反之,体内体外激活TLR9均可上调中性粒细胞miR-223表达。激活TLR9可增强NF-κB同miR-223启动子结合上调miR-233表达,miR-223通过抑制IKKα表达减弱TLR9/NF-κB介导的炎症反应。miR-223在终止急性中性粒细胞反应中发挥重要作用,可作为对乙酰氨基酚引起的肝脏功能衰竭的治疗靶点。

原始出处:

Yong He,Dechun Feng,Man Li,et al. Hepatic mtDNA-TLR9-microRNA-223 forms a negative feedback loop to limit neutrophil over-activation and acetaminophen hepatotoxicity. Hepatology,13 March 2017,DOI: 10.1002/hep.29153.

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    2018-01-11 lilianxiang
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    2017-08-18 xjy02
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    2017-03-31 gwc384
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    2017-03-31 zhouqu_8
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    2017-03-31 ylzr123

    感谢小编为我们精心准备了如此精辟的精神大餐,小编辛苦了!

    0

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