Nature Biomedical Engineering:PD-L1棕榈酰化修饰及相应抑制剂开发策略

2019-03-30 佚名 上海交大

近日,上海交通大学医学院附属仁济医院消化所许杰课题组在《自然》子刊(Nature Biomedical Engineering期刊)发表题为"Inhibiting PD-L1 palmitoylation enhances T-cell immune responses against tumours"的研究论文。论文进一步报道了PD-L1的棕榈酰化修饰促进其表达的机制,通过设计的PD-PALM多

近日,上海交通大学医学院附属仁济医院消化所许杰课题组在《自然》子刊(Nature Biomedical Engineering期刊)发表题为"Inhibiting PD-L1 palmitoylation enhances T-cell immune responses against tumours"的研究论文。论文进一步报道了PD-L1的棕榈酰化修饰促进其表达的机制,通过设计的PD-PALM多肽降低了肿瘤细胞PD-L1的表达量,并开发了可竞争抑制PD-L1棕榈酰化的靶向多肽分子,为免疫检查点抑制剂开发提供了新思路,该靶向多肽分子经过优化有望成为肿瘤免疫治疗药物。

论文在线发表的同时,杂志配发了该领域资深专家Stephane Lefrancois的述评,详细地解释了这项工作的科学发现以及意义,认为“利用多肽抑制剂来阻断PD-L1棕榈酰化提示了基于翻译后修饰的新的靶向方法,许杰课题组开发的这种细胞穿透多肽显着抑制了PD-L1的表达因而可能有潜力成为治疗分子”

免疫检查点(immune checkpoints)是分布于体内免疫系统中的抑制性信号通路,能够调控免疫反应的强弱和持续时间,避免组织损伤并维持机体自身的耐受。肿瘤能够利用免疫检查点通路的抑制作用,逃避免疫细胞的识别,特别是抑制T细胞的免疫应答,实现免疫逃逸。因此,抑制免疫检查点可以激发免疫系统原有的抗肿瘤能力。靶向免疫检查点蛋白CTLA-4、 PD-1/PD-L1的单克隆抗体已经被批准用于治疗多种类型的恶性肿瘤。

然而免疫检查点阻断疗法仍存在总体效率不高、长期使用后产生耐药以及可发生严重副作用等问题。PD-L1是PD-1的主要配体,一部分肿瘤依赖其表达的PD-L1结合T表面的PD-1并引起T细胞衰竭,促使肿瘤逃避宿主免疫系统的监视和杀伤作用。因此对PD-L1调控机制的深入研究将有助于改善治疗的效果。近年来的研究发现PD-L1不仅表达在细胞表面,还存在于细胞内的高尔基体、循环内体以及微囊泡上;细胞内的PD-L1有促癌功能,并可重新被转运到细胞表面。因此旨在彻底清除PD-L1的靶向蛋白质降解策略受到关注。许杰课题组近期发现了PD-L1的溶酶体降解机制,并在HIP1R蛋白调控模式的启发下设计了PD-LYSO用于靶向降解PD-L1(Nature Chemical Biology 2019)。

由于目前棕榈酰化的小分子抑制剂缺少对DHHC酶的选择性,因此许杰课题组进行了棕榈酰化竞争性抑制剂的设计尝试。因为DHHC酶的特异性由底物序列决定,所以PD-L1的被修饰位点临近序列可能被DHHC3修饰,从而减少对内源性的PD-L1修饰。理论上这种竞争性多肽对其它DHHC成员的影响较小,因此可能其作用的选择性较2-BP更强。作者通过一系列实验证明上述竞争抑制剂的设计思路是切实有效的,并通过设计的PD-PALM多肽降低了肿瘤细胞PD-L1的表达量。在此基础上,今后还可以对PD-PALM进行衍生改造和修饰,以进一步提高其活性和稳定性,增强其成药潜力。

这一研究对PD-L1的棕榈酰化进行了较为深入的功能和机制探究,揭示了PD-L1棕榈酰化影响其溶酶体降解的确切途径,设计了以棕榈酰化为靶点的多肽型PD-L1抑制剂,为棕榈酰化相关的机制与转化研究带来启示。

原始出处:

Han Yao,et al.Inhibiting PD-L1 palmitoylation enhances T-cell immune responses against tumours.Nature Biomedical Engineering.25 March 2019

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    2019-06-30 jklm09
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time=2019-04-01, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1533578, encodeId=546115335e8c9, content=<a href='/topic/show?id=7583114e529' target=_blank style='color:#2F92EE;'>#Medical#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=27, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=11475, encryptionId=7583114e529, topicName=Medical)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=cbe912466517, createdName=海豹, createdTime=Mon Apr 01 09:23:00 CST 2019, time=2019-04-01, status=1, ipAttribution=)]
    2019-10-09 sunylz
  4. 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time=2019-04-01, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1533578, encodeId=546115335e8c9, content=<a href='/topic/show?id=7583114e529' target=_blank style='color:#2F92EE;'>#Medical#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=27, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=11475, encryptionId=7583114e529, topicName=Medical)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=cbe912466517, createdName=海豹, createdTime=Mon Apr 01 09:23:00 CST 2019, time=2019-04-01, status=1, ipAttribution=)]
    2020-01-07 jeanqiuqiu
  5. 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  6. 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  7. 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objectType=article, channel=null, level=null, likeNumber=25, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=6787, encryptionId=0a9c6e87ef, topicName=Engin)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=3fc52500170, createdName=12498cbcm00(暂无昵称), createdTime=Mon Aug 05 08:23:00 CST 2019, time=2019-08-05, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=2081545, encodeId=09282081545fe, content=<a href='/topic/show?id=57406e8506' target=_blank style='color:#2F92EE;'>#Eng#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=33, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=6785, encryptionId=57406e8506, topicName=Eng)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=3516494, createdName=spoonycyy, createdTime=Sat Sep 28 05:23:00 CST 2019, time=2019-09-28, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1883649, encodeId=f73c188364938, content=<a href='/topic/show?id=3b2112532d8' target=_blank style='color:#2F92EE;'>#Nat#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=24, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=12532, encryptionId=3b2112532d8, topicName=Nat)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=2e6f107, createdName=liye789132251, createdTime=Wed Mar 11 02:23:00 CST 2020, time=2020-03-11, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1254990, encodeId=e09c1254990f3, content=<a href='/topic/show?id=be71139214f' target=_blank style='color:#2F92EE;'>#PD-L1#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=25, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=13921, encryptionId=be71139214f, topicName=PD-L1)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=e76f39, createdName=smartjoy, createdTime=Mon Apr 01 09:23:00 CST 2019, time=2019-04-01, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1533578, encodeId=546115335e8c9, content=<a href='/topic/show?id=7583114e529' target=_blank style='color:#2F92EE;'>#Medical#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=27, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=11475, encryptionId=7583114e529, topicName=Medical)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=cbe912466517, createdName=海豹, createdTime=Mon Apr 01 09:23:00 CST 2019, time=2019-04-01, status=1, ipAttribution=)]
    2019-09-28 spoonycyy
  8. 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objectType=article, channel=null, level=null, likeNumber=25, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=6787, encryptionId=0a9c6e87ef, topicName=Engin)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=3fc52500170, createdName=12498cbcm00(暂无昵称), createdTime=Mon Aug 05 08:23:00 CST 2019, time=2019-08-05, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=2081545, encodeId=09282081545fe, content=<a href='/topic/show?id=57406e8506' target=_blank style='color:#2F92EE;'>#Eng#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=33, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=6785, encryptionId=57406e8506, topicName=Eng)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=3516494, createdName=spoonycyy, createdTime=Sat Sep 28 05:23:00 CST 2019, time=2019-09-28, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1883649, encodeId=f73c188364938, content=<a href='/topic/show?id=3b2112532d8' target=_blank style='color:#2F92EE;'>#Nat#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=24, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=12532, encryptionId=3b2112532d8, topicName=Nat)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=2e6f107, createdName=liye789132251, createdTime=Wed Mar 11 02:23:00 CST 2020, time=2020-03-11, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1254990, encodeId=e09c1254990f3, content=<a href='/topic/show?id=be71139214f' target=_blank style='color:#2F92EE;'>#PD-L1#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=25, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=13921, encryptionId=be71139214f, topicName=PD-L1)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=e76f39, createdName=smartjoy, createdTime=Mon Apr 01 09:23:00 CST 2019, time=2019-04-01, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1533578, encodeId=546115335e8c9, content=<a href='/topic/show?id=7583114e529' target=_blank style='color:#2F92EE;'>#Medical#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=27, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=11475, encryptionId=7583114e529, topicName=Medical)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=cbe912466517, createdName=海豹, createdTime=Mon Apr 01 09:23:00 CST 2019, time=2019-04-01, status=1, ipAttribution=)]
    2020-03-11 liye789132251
  9. 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content=<a href='/topic/show?id=3b2112532d8' target=_blank style='color:#2F92EE;'>#Nat#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=24, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=12532, encryptionId=3b2112532d8, topicName=Nat)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=2e6f107, createdName=liye789132251, createdTime=Wed Mar 11 02:23:00 CST 2020, time=2020-03-11, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1254990, encodeId=e09c1254990f3, content=<a href='/topic/show?id=be71139214f' target=_blank style='color:#2F92EE;'>#PD-L1#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=25, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=13921, encryptionId=be71139214f, topicName=PD-L1)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=e76f39, createdName=smartjoy, createdTime=Mon Apr 01 09:23:00 CST 2019, time=2019-04-01, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1533578, encodeId=546115335e8c9, content=<a href='/topic/show?id=7583114e529' target=_blank style='color:#2F92EE;'>#Medical#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=27, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=11475, encryptionId=7583114e529, topicName=Medical)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=cbe912466517, createdName=海豹, createdTime=Mon Apr 01 09:23:00 CST 2019, time=2019-04-01, status=1, ipAttribution=)]
    2019-04-01 smartjoy
  10. 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    2019-04-01 海豹

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