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PNAS:香蕉凝集素衍生物能抗流感和冠状病毒,体内实验有效!

2020-02-04 佚名 MED24

美国密歇根州立大学团队发现,香蕉里的蛋白质——香蕉凝集素具有抗病毒作用,但也会引起很大不良反应。于是,他们对香蕉凝集素进行结构改造,替换了一个氨基酸,合成一种新化合物,经小鼠内体实验证实可以安全地防御多种病毒,包括耐药的致命流感病毒。最新研究结果发表在2020年1月13日的《美国国家科学院院刊》(PNAS,影响因子9.58)。其靶点和机制研究也表明,新化合物可能对埃博拉,HIV,麻疹,MERS、S

美国密歇根州立大学团队发现,香蕉里的蛋白质——香蕉凝集素具有抗病毒作用,但也会引起很大不良反应。

于是,他们对香蕉凝集素进行结构改造,替换了一个氨基酸,合成一种新化合物,经小鼠内体实验证实可以安全地防御多种病毒,包括耐药的致命流感病毒。

最新研究结果发表在2020年1月13日的《美国国家科学院院刊》(PNAS,影响因子9.58)。

其靶点和机制研究也表明,新化合物可能对埃博拉,HIV,麻疹,MERS、SARS等冠状病毒都有效。

密歇根州立大学传染病学系内科学教授大卫·马尔科维茨(David Markovitz)介绍,他们团队多年来一直致力于研究从香蕉中开发广谱抗病毒药物,此前就曾在《细胞》(cell)、《生物化学杂志》等发表过早期论文。



天然的香蕉凝集素是种外源性蛋白质,直接注射到体内会被抗体中和,引起炎症和危险的免疫反应。

对其结构改造的衍生物H84T,把第84位的氨基酸从组氨酸替换成了苏氨酸,则很大程度降低免疫原性。

给实验小鼠注射后,小鼠暴露在致命性流感病毒下72小时后还有超过80%仍能存活。 注射后小鼠确实产生了针对H84T的抗体,但并未产生明显不良反应。H84T对暴露在流感病毒下的小鼠有保护作用

而进一步机制研究显示,化合物的作用靶点是病毒外壳上的糖基——高甘露糖(high mannose),这种结构在健康的细胞里是没有的。H84T结合高甘露糖后阻断了流感病毒与生物体内的胞内体融合过程,这是感染的关键步骤,这样病毒就无法进一步复制和造成破坏。

该机制意味着,H84T不仅对流感有效,而且对埃博拉,HIV,麻疹,MERS、 SARS和所有其他冠状病毒都可能有效。

数据还表明,该化合物对重症流感标准疗法达菲(奥司他韦)无效的案例也有作用,其与奥司他韦之间可能会产生协同效应。

研究者表示,他们当然希望这种新的药物能进一步临床开发并上市,但“制药经济学”却不太支持一次性的突发疫情用药开发。

当人类遭遇从未见过却威胁生命的新型病毒,哪些治疗手段和药物可能有效?这需要业界、政府乃至全社会加大投入,加强开发储备有效的新药,我们期待着。

相关资料:A molecularly engineered antiviral banana lectin inhibits fusion and is efficacious against influenza virus infection in vivo(doi.org/10.1073/pnas.1915152117)

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    2021-05-18 ms2000001361349190

    这个挺好,不过凝集素这种东西也是一种植物蛋白毒素。

    0

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  5. [GetPortalCommentsPageByObjectIdResponse(id=966511, encodeId=242b96651182, content=这个挺好,不过凝集素这种东西也是一种植物蛋白毒素。, beContent=null, objectType=article, channel=null, level=null, likeNumber=93, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=dffa5465843, createdName=ms2000001361349190, createdTime=Tue May 18 11:09:07 CST 2021, time=2021-05-18, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=2056456, encodeId=d2e4205645660, content=<a href='/topic/show?id=345b69441fb' target=_blank style='color:#2F92EE;'>#生物能#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=80, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=69441, encryptionId=345b69441fb, topicName=生物能)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=a57b78, createdName=朱睿睿, createdTime=Tue Mar 31 21:55:00 CST 2020, time=2020-03-31, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=2055841, encodeId=84be205584175, content=<a href='/topic/show?id=933e101419b7' target=_blank style='color:#2F92EE;'>#香蕉凝集素#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=75, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=101419, encryptionId=933e101419b7, topicName=香蕉凝集素)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=754b42, createdName=Luyuxie_9, createdTime=Fri Jul 03 10:55:00 CST 2020, time=2020-07-03, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1812679, encodeId=5d8818126e9f6, content=<a href='/topic/show?id=d193900940b' target=_blank style='color:#2F92EE;'>#衍生物#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=84, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=90094, encryptionId=d193900940b, topicName=衍生物)], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/aLGWoFXAyMbIu3qymFOyheQLjPSX3OUs5GmkyBlcCOwTPIeq3why9NGibxxUqYo6hcx8qZLHZFgNPnBK1yzWeOFpyg2OnWOt0/0, createdBy=fa4716, createdName=仁心济世, createdTime=Wed Dec 16 23:55:00 CST 2020, time=2020-12-16, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1856379, encodeId=9ee018563e92d, content=<a href='/topic/show?id=f32014428fc' target=_blank style='color:#2F92EE;'>#PNAS#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=70, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=14428, encryptionId=f32014428fc, topicName=PNAS)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=08e964, createdName=drwjr, createdTime=Sat Jul 18 23:55:00 CST 2020, time=2020-07-18, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=379118, encodeId=6f073e911835, content=了解一下, beContent=null, objectType=article, channel=null, level=null, likeNumber=114, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/NUyjXTCJjo6KcicAVC1MwuOgo3iaicb1Imgk1yIfnvr6oXzibcAFB6puAyNJXbzWhNuLqaFYBVRWjh7rghkvFLPxMAfD5ib3nXwVD/0, createdBy=bed21972958, createdName=wxl882001, createdTime=Tue Feb 11 17:25:19 CST 2020, time=2020-02-11, status=1, ipAttribution=)]
    2020-07-18 drwjr
  6. [GetPortalCommentsPageByObjectIdResponse(id=966511, encodeId=242b96651182, content=这个挺好,不过凝集素这种东西也是一种植物蛋白毒素。, beContent=null, objectType=article, channel=null, level=null, likeNumber=93, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=dffa5465843, createdName=ms2000001361349190, createdTime=Tue May 18 11:09:07 CST 2021, time=2021-05-18, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=2056456, encodeId=d2e4205645660, content=<a href='/topic/show?id=345b69441fb' target=_blank style='color:#2F92EE;'>#生物能#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=80, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=69441, encryptionId=345b69441fb, topicName=生物能)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=a57b78, createdName=朱睿睿, createdTime=Tue Mar 31 21:55:00 CST 2020, time=2020-03-31, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=2055841, encodeId=84be205584175, content=<a href='/topic/show?id=933e101419b7' target=_blank style='color:#2F92EE;'>#香蕉凝集素#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=75, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=101419, encryptionId=933e101419b7, topicName=香蕉凝集素)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=754b42, createdName=Luyuxie_9, createdTime=Fri Jul 03 10:55:00 CST 2020, time=2020-07-03, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1812679, encodeId=5d8818126e9f6, content=<a href='/topic/show?id=d193900940b' target=_blank style='color:#2F92EE;'>#衍生物#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=84, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=90094, encryptionId=d193900940b, topicName=衍生物)], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/aLGWoFXAyMbIu3qymFOyheQLjPSX3OUs5GmkyBlcCOwTPIeq3why9NGibxxUqYo6hcx8qZLHZFgNPnBK1yzWeOFpyg2OnWOt0/0, createdBy=fa4716, createdName=仁心济世, createdTime=Wed Dec 16 23:55:00 CST 2020, time=2020-12-16, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1856379, encodeId=9ee018563e92d, content=<a href='/topic/show?id=f32014428fc' target=_blank style='color:#2F92EE;'>#PNAS#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=70, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=14428, encryptionId=f32014428fc, topicName=PNAS)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=08e964, createdName=drwjr, createdTime=Sat Jul 18 23:55:00 CST 2020, time=2020-07-18, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=379118, encodeId=6f073e911835, content=了解一下, beContent=null, objectType=article, channel=null, level=null, likeNumber=114, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/NUyjXTCJjo6KcicAVC1MwuOgo3iaicb1Imgk1yIfnvr6oXzibcAFB6puAyNJXbzWhNuLqaFYBVRWjh7rghkvFLPxMAfD5ib3nXwVD/0, createdBy=bed21972958, createdName=wxl882001, createdTime=Tue Feb 11 17:25:19 CST 2020, time=2020-02-11, status=1, ipAttribution=)]
    2020-02-11 wxl882001

    了解一下

    0

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