Neuron:PDGFRβ细胞释放CCL2的生理功能

2018-09-29 细胞 中科院神经所

中国科学院神经科学研究所、脑科学与智能技术卓越创新中心、神经科学国家重点实验室于翔研究组在《神经元》期刊在线发表了题为“PDGFRβ Cells Rapidly Relay Inflammatory Signal from the Circulatory System to Neurons via Chemokine CCL2(PDGFRβ细胞通过趋化因子CCL2介导了外周感染信号向中枢神经系统的

中国科学院神经科学研究所、脑科学与智能技术卓越创新中心、神经科学国家重点实验室于翔研究组在《神经元》期刊在线发表了题为“PDGFRβ Cells Rapidly Relay Inflammatory Signal from the Circulatory System to Neurons via Chemokine CCL2(PDGFRβ细胞通过趋化因子CCL2介导了外周感染信号向中枢神经系统的快速传

中国科学院神经科学研究所、脑科学与智能技术卓越创新中心、神经科学国家重点实验室于翔研究组在《神经元》期刊在线发表了题为《PDGFRβ细胞通过趋化因子CCL2介导了外周感染信号向中枢神经系统的快速传递》的研究性论文。

这项研究发现,在系统性感染早期,小鼠脑内的PDGFRβ细胞快速感应循环系统中的感染信号,并通过释放趋化因子CCL2增强多个脑区神经元的兴奋性突触传递与放电频率。PDGFRβ细胞是一种血管旁细胞,是大脑神经血管单元与血脑屏障的重要组成部分,具有维持血脑屏障、调控血管血流量等功能。

神经系统、免疫系统与循环系统有着紧密的相互调节关系。近期的研究表明,免疫细胞与其分泌的各种因子在生理和病理条件下均可跨过血脑屏障;越来越多的经典免疫因子被发现在神经发育与突触可塑性过程中发挥重要作用;免疫系统与神经系统的细胞可以相互调控。神经系统、免疫系统与循环系统的相互调控在感染导致的疾病中尤为重要。对于五岁以下的儿童,感染是导致死亡的主要诱因。没有被有效控制的系统炎症可能导致脑炎、脑膜炎、惊厥等中枢神经系统疾病。新生儿时期的神经炎症也被报道与发育迟缓、癫痫、孤独症谱系障碍、精神分裂症等疾病的发病相关。

前人关于神经炎症的研究主要关注炎症后期的反应,包括小胶质细胞与星形胶质细胞的激活,白细胞对脑实质的入侵,以及上述细胞分泌的相关细胞因子的作用。在感染的早期(2小时),脑脊液中即可检测到大量细胞因子(CCL2等),感染导致的病态行为(sickness behavior)在感染早期也已出现。然而,由于血脑屏障的存在,在系统性感染的早期,小胶质细胞和星形胶质细胞并未被充分激活,因此这两种细胞不是CCL2的主要来源。那么大量的细胞因子是哪类细胞产生的?是否有一种特定细胞可以迅速地感受外周感染信号并将其传递给中枢神经系统,从而影响大脑的功能呢?

于翔研究组的段力辉与张小荻同学通过建立多种模拟细菌或病毒感染的小鼠系统炎症模型,发现PDGFRβ细胞分泌的趋化因子CCL2(又名MCP-1)在炎症早期高表达。运用多种转基因小鼠模型,结合原位杂交与免疫组织化学,以及在PDGFRβ细胞中对Ccl2进行条件性敲除(Pdgfrb-Cre;Ccl2fl/fl),他们验证了该结果。通过单细胞测序进一步发现,Col1a1或Rgs5亚型的PDGFRβ细胞在炎症早期高表达Ccl2。单细胞测序的结果还表明PDGFRβ细胞亦同时表达Ccl2以外的多种细胞因子。

PDGFRβ细胞释放的CCL2有何种生理功能?脑片电生理实验表明,CCL2可以作用于多个脑区的谷氨酸能神经元,提高其兴奋性突触传递,从而提高其整体兴奋性。培养的人脑血管周细胞可以在LPS或Poly(I:C) 的刺激下释放CCL2,用其细胞培养液孵育急性脑片也可以导致多个脑区的谷氨酸能神经元的兴奋性突触传递增强且兴奋性升高。使用Pdgfrb-Cre;Ccl2fl/fl小鼠,在PDGFRβ细胞中敲除Ccl2后,LPS注射导致的兴奋性突触传递增强与病态行为也得到了有效抑制。上述研究的主要实验在发育期的小鼠上完成,但其主要发现均可在成年与老年鼠中重复,提示上述机制具有广谱性。综上,该研究结果首次揭示了,PDGFRβ细胞作为大脑对外部感染的快速反应者,可以迅速地感知外周的感染和炎症,并将该信号转递给脑实质。该工作也首次报道了PDGFRβ细胞可以调控神经元的兴奋性。

CCL2或PDGFRβ细胞分泌的其他因子是否影响神经炎症后期小胶质细胞与星形胶质细胞的激活,有待进一步的研究。作为脑内最早感受系统炎症并对其做出反应的细胞类型,PDGFRβ细胞(Col1a1 和/或Rgs5亚型)是治疗中枢神经系统感染的潜在新靶点。由于其位于脑实质与循环系统界面的特殊位置,靶向PDGFRβ细胞等血脑屏障组成细胞的药物有不需要跨过血脑屏障的优势。

该研究由博士研究生段力辉、张小荻在于翔研究员的指导下完成,实验室成员苗婉莹等对该研究做出了重要贡献。该研究得到了科技部重点研发计划 (2016YFA0501000)、国家自然科学基金 (31530030) 和上海市优秀学科带头人计划 (16XD1404800) 的资助。

原始出处:
PDGFRβ Cells Rapidly Relay Inflammatory Signal from the Circulatory System to Neurons via Chemokine CCL2.https://www.cell.com/neuron/fulltext/S0896-6273(18)30735-9

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    2019-06-16 by2021
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    2018-11-06 charl1234567
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    2018-10-01 liuyiping
  5. [GetPortalCommentsPageByObjectIdResponse(id=1751871, encodeId=7fcd1e51871df, content=<a href='/topic/show?id=9b6a12e0155' target=_blank style='color:#2F92EE;'>#Neuron#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=40, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=12701, encryptionId=9b6a12e0155, topicName=Neuron)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=c9c736410065, createdName=by2021, createdTime=Sun Jun 16 22:18:00 CST 2019, time=2019-06-16, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1786921, encodeId=e7e91e869212d, content=<a href='/topic/show?id=dc5713954f9' target=_blank style='color:#2F92EE;'>#PDGFRβ细胞#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=47, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=13954, encryptionId=dc5713954f9, topicName=PDGFRβ细胞)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=6c3a189, createdName=longqijun248, createdTime=Fri Oct 26 20:18:00 CST 2018, time=2018-10-26, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1991480, encodeId=3d0b199148028, content=<a href='/topic/show?id=78e4421227' target=_blank style='color:#2F92EE;'>#CCL2#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=57, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4212, encryptionId=78e4421227, topicName=CCL2)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=62a7397, createdName=charl1234567, createdTime=Tue Nov 06 20:18:00 CST 2018, time=2018-11-06, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1534394, encodeId=4ea9153439438, content=<a href='/topic/show?id=22b3e9887e' target=_blank style='color:#2F92EE;'>#GFR#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=55, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=7988, encryptionId=22b3e9887e, topicName=GFR)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=f0a812532020, createdName=liuyiping, createdTime=Mon Oct 01 12:18:00 CST 2018, time=2018-10-01, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1618898, encodeId=24fa16188983b, content=<a href='/topic/show?id=007419239ca' target=_blank style='color:#2F92EE;'>#β细胞#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=69, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=19239, encryptionId=007419239ca, topicName=β细胞)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=b69919964433, createdName=ms24272190615788285182, createdTime=Mon Oct 01 12:18:00 CST 2018, time=2018-10-01, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=347280, encodeId=718a34e280fb, content=学习了, beContent=null, objectType=article, channel=null, level=null, likeNumber=66, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=82311653708, createdName=医者仁心5538, createdTime=Sat Sep 29 21:58:19 CST 2018, time=2018-09-29, status=1, ipAttribution=)]
  6. [GetPortalCommentsPageByObjectIdResponse(id=1751871, encodeId=7fcd1e51871df, content=<a href='/topic/show?id=9b6a12e0155' target=_blank style='color:#2F92EE;'>#Neuron#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=40, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=12701, encryptionId=9b6a12e0155, topicName=Neuron)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=c9c736410065, createdName=by2021, createdTime=Sun Jun 16 22:18:00 CST 2019, time=2019-06-16, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1786921, encodeId=e7e91e869212d, content=<a href='/topic/show?id=dc5713954f9' target=_blank style='color:#2F92EE;'>#PDGFRβ细胞#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=47, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=13954, encryptionId=dc5713954f9, topicName=PDGFRβ细胞)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=6c3a189, createdName=longqijun248, createdTime=Fri Oct 26 20:18:00 CST 2018, time=2018-10-26, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1991480, encodeId=3d0b199148028, content=<a href='/topic/show?id=78e4421227' target=_blank style='color:#2F92EE;'>#CCL2#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=57, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4212, encryptionId=78e4421227, topicName=CCL2)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=62a7397, createdName=charl1234567, createdTime=Tue Nov 06 20:18:00 CST 2018, time=2018-11-06, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1534394, encodeId=4ea9153439438, content=<a href='/topic/show?id=22b3e9887e' target=_blank style='color:#2F92EE;'>#GFR#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=55, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=7988, encryptionId=22b3e9887e, topicName=GFR)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=f0a812532020, createdName=liuyiping, createdTime=Mon Oct 01 12:18:00 CST 2018, time=2018-10-01, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1618898, encodeId=24fa16188983b, content=<a href='/topic/show?id=007419239ca' target=_blank style='color:#2F92EE;'>#β细胞#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=69, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=19239, encryptionId=007419239ca, topicName=β细胞)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=b69919964433, createdName=ms24272190615788285182, createdTime=Mon Oct 01 12:18:00 CST 2018, time=2018-10-01, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=347280, encodeId=718a34e280fb, content=学习了, beContent=null, objectType=article, channel=null, level=null, likeNumber=66, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=82311653708, createdName=医者仁心5538, createdTime=Sat Sep 29 21:58:19 CST 2018, time=2018-09-29, status=1, ipAttribution=)]
    2018-09-29 医者仁心5538

    学习了

    0

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