Nat Commun:大肠杆菌穿越血脑屏障“钥匙”找到 为新生儿细菌性脑膜炎药物研发提供思路

2018-06-20 郭秀芝 阎红 健康报

近日,学术期刊《自然·通讯》在线发表了中国医科大学基础医学院发育细胞生物学教研室陈誉华团队的研究成果,其研究首次揭示了新生儿大肠杆菌侵袭中枢神经系统并导致细菌性脑膜炎的机制。大肠杆菌穿越血脑屏障“钥匙”找到 为新生儿细菌性脑膜炎药物研发提供思路

近日,学术期刊《自然·通讯》在线发表了中国医科大学基础医学院发育细胞生物学教研室陈誉华团队的研究成果,其研究首次揭示了新生儿大肠杆菌侵袭中枢神经系统并导致细菌性脑膜炎的机制。

大肠杆菌是引起新生儿细菌性脑膜炎最常见的革兰氏阴性菌,尽管有抗生素,但因细菌耐药及大部分抗生素难以穿过血液与脑组织之间的屏障结构(血脑屏障)入脑,致使该病病死率高,幸存者常伴有失聪、失明、癫痫、智力和运动障碍等后遗症。目前,对新生儿细菌性脑膜炎发病的分子机制仍不明确。既往研究显示,大肠杆菌引起新生儿细菌性脑膜炎的首要条件是必须穿过血脑屏障。

陈誉华团队首先确定大肠杆菌毒力因子 IbeA 为分泌性蛋白,然后以 IbeA 蛋白为诱饵,从人脑微血管内皮细胞中筛选到互作蛋白 Caspr1,发现其为定位于脑微血管内皮细胞管腔侧的跨膜蛋白。转基因小鼠实验证明,细菌穿过血脑屏障并引起脑膜炎需要 Caspr1 的帮助。进一步研究发现细菌穿过血脑屏障的相关机制。具有治疗意义的是,预先注射 Caspr1 的特定肽段能够显着减少新生大鼠脑膜炎的发生率和死亡率。

该研究首次在体内鉴定了大肠杆菌侵袭和穿过血脑屏障所必需的新受体 Caspr1,为制备阻断药物提供了可靠的分子靶标。

原始出处:

Wei-Dong Zhao, Dong-Xin Liu, et al. Caspr1 is a host receptor for meningitis-causing Escherichia coli. Nature Communications 9, 2296.

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    2018-06-21 lqvr
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    2018-06-20 happsf

    学习

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