PNAS: 孙炳伟团队揭示中性粒细胞趋化功能抑制新机制

2017-04-18 佚名 科学网

4 月 10 日,国际著名学术期刊《美国科学院院刊》在线发表了江苏大学附属医院孙炳伟教授团队的研究成果“Endotoxin induced autocrine ATP signaling inhibits neutrophil chemotaxis through enhancing myosin light chain phosphorylation” (内毒素引起的自分泌 ATP 信号通过促进

4月10日,国际著名学术期刊《美国科学院院刊》在线发表了江苏大学附属医院孙炳伟教授团队的研究成果“Endotoxin induced autocrine ATP signaling inhibits neutrophil chemotaxis through enhancing myosin light chain phosphorylation” (内毒素引起的自分泌 ATP 信号通过促进肌球蛋白轻链磷酸化抑制中性粒细胞趋化功能)。该研究得到国家自然科学基金的资助。

人体天然免疫细胞 -- 中性粒细胞是血液内含量最丰富的免疫细胞,细菌感染初期,中性粒细胞即可探测到细菌的信号,在趋化分子的精准“导航”下迅速从血管内趋化至病原部位,发挥强大的吞噬和杀灭细菌的功能。细菌内毒素是革兰氏阴性菌细胞壁表面的主要组成成分,严重感染时细菌释放出大量的内毒素,内毒素随血液循环到达全身的组织和器官,引起全身性中毒症状;同时内毒素使中性粒细胞“导航”系统失灵,干扰其向病原部位的趋化,从而抑制了中性粒细胞发挥抗菌能力。这是严重感染患者死亡的重要原因之一。

孙炳伟教授团队历时三年多的时间,发现了细菌内毒素使中性粒细胞“导航”系统失灵的机制:中性粒细胞骨架蛋白 MLC 的正常磷酸化与极性化控制了中性粒细胞尾足的伸展与收缩,在保障中性粒细胞趋化方向起着重要的作用,而细菌内毒素刺激中性粒细胞后,激发了中性粒细胞自分泌 ATP,并顺序活化了 ATP/P2X1/Ca2+ 信号通路,导致了细胞骨架蛋白 MLC 的异常磷酸化及极性化,扰乱了中性粒细胞的趋化方向,最终影响其到达炎症部位发挥杀菌功能。



“严重感染、脓毒症是住院患者死亡的主要病因之一,确保中性粒细胞‘导航’系统正常对严重感染的治疗具有重要意义。”论文的第一作者王旭博士说,“明确自分泌 ATP/P2X1/Ca2+ 信号通路的异常活化可能是严重感染时中性粒细胞“导航”系统受损的关键分子机制非常重要,我们下一步将以此为干预靶点进行深入研究,为严重感染的精准治疗提供重要的理论依据,发挥其潜在的转化应用价值。”

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    2017-10-17 drwjr
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    2017-04-19 stupidox

    阅读了谢谢分享

    0

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    2017-04-18 吴教授

    学习了

    0

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