Nat Metab:我国学者发现新冠病毒入侵的辅助受体

2020-11-29 Bio生物世界 Bio生物世界

新型冠状病毒因其高感染力和高传播性,在全球范围内广泛流行,对人类的生产和生活造成了持续影响,行之有效的治疗干预措施对疫情的控制至关重要。血管紧张素转化酶2(ACE2)是目前已知最重要的新冠病毒受体。

新型冠状病毒因其高感染力和高传播性,在全球范围内广泛流行,对人类的生产和生活造成了持续影响,行之有效的治疗干预措施对疫情的控制至关重要。血管紧张素转化酶2(ACE2)是目前已知最重要的新冠病毒受体,研究人员基于ACE2受体为靶点开发了许多治疗药物和疫苗,并且已经取得积极的成果。

然而,ACE2在许多组织中的表达水平较低,这提示新冠病毒的入侵还依赖未知的辅助受体。近期多篇顶级期刊报道了新冠病毒入侵的新型辅助受体:2020年10月20日,同日两篇 Science 期刊发表的研究表明NRP1能够增强新冠病毒的感染能力;2020年11月12日,Cell 期刊发表的研究表明硫酸乙酰肝素同样为新冠病毒的辅助受体。

2020年11月26日,军事医学研究院钟辉研究员、陈薇院士和秦成峰研究员,与中国人民解放军第九六〇医院曹源教授等合作在 Nature Metabolism 杂志上发表了题为:HDL-scavenger receptor B type 1 facilitates SARS-CoV-2 entry 的研究论文。

该研究发现B族Ⅰ型清道夫受体(SR-B1)是新冠病毒的辅助受体。新冠病毒的S蛋白能够与人体内重要代谢物—高密度脂蛋白(HDL)结合,HDL随后成为S蛋白和细胞表面SR-B1的“桥梁”,促进病毒对细胞的黏附和入侵。

图1. 新冠病毒通过HDL-SR-B1入侵细胞的机制

高密度脂蛋白(High-density lipoprotein,HDL)是脂蛋白的一种,是由蛋白质和脂质组成的大分子复合物。借由SR-B1受体,HDL能够参与胆固醇的逆向转运,将胆固醇从细胞外组织转运到细胞内研究者首先对新冠病毒S蛋白的一级序列进行了分析,发现了六个可能的胆固醇结合基序。进一步借助微量热泳动(MST)、表面等离子共振(SPR)等技术研究发现,S蛋白能够与胆固醇以及与HDL结合。

图2. 新冠病毒S蛋白能够与胆固醇以及HDL结合

通过流式细胞术等技术研究发现HDL能够显着增强新冠病毒的S蛋白与细胞表面的结合。进一步研究发现,当新冠病毒感染体系中加入HDL之后,能够显着促进新冠病毒与细胞的结合和进入侵袭。

图3. HDL能够促进新冠病毒对细胞的黏附与侵袭

最后,研究人员发现在HDL存在的条件下,新冠病毒能够与SR-B1结合。此外,敲低SR-B1能够抑制新冠病毒对细胞的感染;而将SR-B1过表达之后,新冠病毒对细胞的感染则显着增强。SR-B1的抑制剂能够有效抑制新冠病毒对细胞的感染。

图4. SR-B1是新冠病毒感染的辅助受体

该研究揭示了SR-B1是新冠病毒的辅助受体,明确了新冠病毒与脂代谢之间的联系,扩展了对新冠病毒感染细胞机制的认识,也为筛选和开发抗新冠病毒感染药物提供了理论基础。

本次研究得到清华大学常卿老师的大力支持。军事医学研究院钟辉研究员、陈薇院士、秦成峰研究员,中国人民解放军第九六〇医院曹源教授,中国医科大学张睿教授,北京热景生物技术有限公司高琪为本文的共同通讯作者;军事医学研究院魏从文副研究员、万禄明助理研究员、博士后杨小盼、张军研究员、硕士研究生焉秋林、王晓林为本文的共同一作。

原始出处:

Congwen Wei , Luming Wan , Qiulin Yan ,et al. HDL-scavenger receptor B type 1 facilitates SARS-CoV-2 entry.Nat Metab. 2020 Nov 26. doi: 10.1038/s42255-020-00324-0.

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    2021-01-09 一闲
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    2021-09-29 liye789132251
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    2020-12-21 guojianrong
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    2020-11-29 公卫新人

    新冠肺炎,疫情何时才能消失

    0

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    2020-11-29 wxl882001

    了解

    0

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    2020-11-29 ms7000001974937342

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