Cell Res:神经所于翔研究组揭示神经元突起形成机制

2017-04-21 叶瑞优 神经科学研究所

近日,《细胞研究》期刊在线发表了中国科学院上海生命科学研究院神经科学研究所于翔研究组题为《3, 4二磷酸磷脂酰肌醇通过调控微丝聚集体介导神经突形成与树突形态发生》的研究论文。该研究发现神经突从微丝聚集体处起始,且3, 4二磷酸磷脂酰肌醇是介导微丝聚集体形成的关键膜信号分子。神经元的一个重要特征是具有延伸轴突和树突等神经突结构的能力。神经突从胞体的伸出是神经元形态发生的起始。虽然目前对介导轴突极化、

近日,《细胞研究》期刊在线发表了中国科学院上海生命科学研究院神经科学研究所于翔研究组题为《3, 4二磷酸磷脂酰肌醇通过调控微丝聚集体介导神经突形成与树突形态发生》的研究论文。该研究发现神经突从微丝聚集体处起始,且3, 4二磷酸磷脂酰肌醇是介导微丝聚集体形成的关键膜信号分子。

神经元的一个重要特征是具有延伸轴突和树突等神经突结构的能力。神经突从胞体的伸出是神经元形态发生的起始。虽然目前对介导轴突极化、树突发育和树突棘形成等神经元发育后期过程的分子机制有较深刻的了解,但关于神经突如何起始生长的分子机制仍不清楚。于翔研究组运用体外培养的大鼠海马神经元,结合活体成像和药理学实验,发现新生神经元的细胞膜下存在一层较厚并且规则的聚合肌动蛋白层(actin cortex)。随着发育进程该聚合肌动蛋白层发生重组,然后在细胞膜下形成一个或两个大的微丝聚集体(actin aggregation),神经突从微丝聚集体处伸出形成。进一步的研究发现在神经突起始过程中肌动蛋白的动态变化是必要的,而微管的动态变化和蛋白质合成则对后期的神经突稳定非常重要。

于翔团队更加深入地研究了神经突起始过程中微丝聚集体形成的调控机制,发现一个之前被较少报道的磷脂分子——3, 4二磷酸磷脂酰肌醇[Phosphatidylinositol 3, 4-bisphosphate,PI(3,4)P2],其在细胞膜上呈现出的小颗粒状的聚集,与微丝聚集体有显着的共定位,并且对于微丝聚集体形成和神经突伸出是必要且充分的。作为对照,被广泛研究的相关重要信号分子4, 5二磷酸磷脂酰肌醇 [Phosphatidylinositol 4, 5-bisphosphate,PI(4,5)P2]和3, 4, 5三磷酸磷脂酰肌醇 [Phosphatidylinositol 3, 4, 5-trisphosphate,PI(3,4,5)P3]并不具有这样的功能。包被PI(3,4)P2的玻璃小球能促进微丝聚集体和神经突的形成,而通过药理学干扰PI(3,4)P2的合成则抑制了这两个进程。通过药理学抑制微丝聚集体形成,PI(3,4)P2在膜上的颗粒性聚集依然存在,证明PI(3,4)P2是作为上游信号分子发挥作用的。大鼠脑组织中存在两类调控PI(3,4)P2产生的酶,分别是包含SH2 结构域的肌醇5位磷脂酶(SH2 domain containing inositol 5-phosphatase,SHIP2)和第二类磷脂酰肌醇3位激酶α亚型(class II phosphoinositide 3-kinase alpha,PI3K C2α),这二者互补并且非冗余地调控微丝聚集体的形成、神经突的伸出以及之后的树突发育。此外,神经系统特异的Wiskott-Aldrich 症候蛋白(neural Wiskott-Aldrich syndrome protein,N-WASP)和Arp 2/3蛋白复合体作为PI(3,4)P2下游参与调控神经突的形成以及树突的发育。

该研究工作不仅发现PI(3,4)P2是神经元早期发育过程中的一个极其重要的膜信号分子,而且验证了其在调控微丝聚集体形成和神经突伸出过程中的关键作用。多种神经系统发育性疾病均伴随树突形态的异常改变,进而影响大脑的正常发育,这些发现对研究发育性神经系统疾病有重要的借鉴意义。

该课题由博士研究生张淑鑫与段力辉在研究员于翔的指导下完成。课题受到了国家自然科学基金、中科院战略先导项目、上海市科委的资助。

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    2017-09-10 维他命
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    2017-04-22 飛歌

    学习了很有用

    0

  5. [GetPortalCommentsPageByObjectIdResponse(id=1948413, encodeId=2ea81948413df, content=<a href='/topic/show?id=f53ae431863' target=_blank style='color:#2F92EE;'>#神经所#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=28, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=74318, encryptionId=f53ae431863, topicName=神经所)], attachment=null, authenticateStatus=null, createdAvatar=https://thirdqq.qlogo.cn/qqapp/101173734/363C99735735B7F4CB11D5F78F580525/100, createdBy=aab22500211, createdName=ms3025846204744509, createdTime=Tue Jan 09 18:32:00 CST 2018, time=2018-01-09, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1869914, encodeId=39a2186991427, content=<a href='/topic/show?id=fd764459a8' target=_blank style='color:#2F92EE;'>#Cell#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=20, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4459, encryptionId=fd764459a8, topicName=Cell)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=524d95, createdName=zhaozhouchifen, createdTime=Wed Aug 09 11:32:00 CST 2017, time=2017-08-09, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1960173, encodeId=4c2419601e3a0, content=<a href='/topic/show?id=dbe6445416' target=_blank style='color:#2F92EE;'>#CEL#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=28, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4454, encryptionId=dbe6445416, topicName=CEL)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=c3ff68, createdName=维他命, createdTime=Sun Sep 10 07:32:00 CST 2017, time=2017-09-10, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=189596, encodeId=e2e3189596e1, content=学习了很有用, beContent=null, objectType=article, channel=null, level=null, likeNumber=63, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/oLAjfB7s1ib3IzoRn621JdKCFUI4XvNELcibocrAVU6aUzEVDSaf3rYH08PUYUiagGqxAEhj8g9WqqNvD1CupIpCrmnR2OrqHZh/0, createdBy=7f181365728, createdName=飛歌, createdTime=Sat Apr 22 09:59:13 CST 2017, time=2017-04-22, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=189509, encodeId=3db7189509c6, content=感谢分享一下!!, beContent=null, objectType=article, channel=null, level=null, likeNumber=56, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=20971999626, createdName=laymankey, createdTime=Sat Apr 22 00:16:09 CST 2017, time=2017-04-22, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=189489, encodeId=387818948951, content=签到学习了很多。, beContent=null, objectType=article, channel=null, level=null, likeNumber=0, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=http://q.qlogo.cn/qqapp/1103841572/A3E53E62691178E2F18D7B999FD22131/100, createdBy=f44d2003846, createdName=Chongyang Zhang, createdTime=Fri Apr 21 23:27:14 CST 2017, time=2017-04-21, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=189467, encodeId=fc5718946e48, content=学习了很多的事情, beContent=null, objectType=article, channel=null, level=null, likeNumber=56, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/mStl88fu4NcXNhUvfhzd2dD8SUAwqrufRiaKMGaaBScoAzEicJJibuu3wCIWWQxoLgS2UOBx1vsPe3faZtAiatc0pTWlS6868zZH/0, createdBy=0a231960988, createdName=胖红, createdTime=Fri Apr 21 22:38:57 CST 2017, time=2017-04-21, status=1, ipAttribution=)]
    2017-04-22 laymankey

    感谢分享一下!!

    0

  6. [GetPortalCommentsPageByObjectIdResponse(id=1948413, encodeId=2ea81948413df, content=<a href='/topic/show?id=f53ae431863' target=_blank style='color:#2F92EE;'>#神经所#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=28, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=74318, encryptionId=f53ae431863, topicName=神经所)], attachment=null, authenticateStatus=null, createdAvatar=https://thirdqq.qlogo.cn/qqapp/101173734/363C99735735B7F4CB11D5F78F580525/100, createdBy=aab22500211, createdName=ms3025846204744509, createdTime=Tue Jan 09 18:32:00 CST 2018, time=2018-01-09, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1869914, encodeId=39a2186991427, content=<a href='/topic/show?id=fd764459a8' target=_blank style='color:#2F92EE;'>#Cell#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=20, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4459, encryptionId=fd764459a8, topicName=Cell)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=524d95, createdName=zhaozhouchifen, createdTime=Wed Aug 09 11:32:00 CST 2017, time=2017-08-09, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1960173, encodeId=4c2419601e3a0, content=<a href='/topic/show?id=dbe6445416' target=_blank style='color:#2F92EE;'>#CEL#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=28, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4454, encryptionId=dbe6445416, topicName=CEL)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=c3ff68, createdName=维他命, createdTime=Sun Sep 10 07:32:00 CST 2017, time=2017-09-10, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=189596, encodeId=e2e3189596e1, content=学习了很有用, beContent=null, objectType=article, channel=null, level=null, likeNumber=63, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/oLAjfB7s1ib3IzoRn621JdKCFUI4XvNELcibocrAVU6aUzEVDSaf3rYH08PUYUiagGqxAEhj8g9WqqNvD1CupIpCrmnR2OrqHZh/0, createdBy=7f181365728, createdName=飛歌, createdTime=Sat Apr 22 09:59:13 CST 2017, time=2017-04-22, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=189509, encodeId=3db7189509c6, content=感谢分享一下!!, beContent=null, objectType=article, channel=null, level=null, likeNumber=56, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=20971999626, createdName=laymankey, createdTime=Sat Apr 22 00:16:09 CST 2017, time=2017-04-22, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=189489, encodeId=387818948951, content=签到学习了很多。, beContent=null, objectType=article, channel=null, level=null, likeNumber=0, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=http://q.qlogo.cn/qqapp/1103841572/A3E53E62691178E2F18D7B999FD22131/100, createdBy=f44d2003846, createdName=Chongyang Zhang, createdTime=Fri Apr 21 23:27:14 CST 2017, time=2017-04-21, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=189467, encodeId=fc5718946e48, content=学习了很多的事情, beContent=null, objectType=article, channel=null, level=null, likeNumber=56, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/mStl88fu4NcXNhUvfhzd2dD8SUAwqrufRiaKMGaaBScoAzEicJJibuu3wCIWWQxoLgS2UOBx1vsPe3faZtAiatc0pTWlS6868zZH/0, createdBy=0a231960988, createdName=胖红, createdTime=Fri Apr 21 22:38:57 CST 2017, time=2017-04-21, status=1, ipAttribution=)]
    2017-04-21 Chongyang Zhang

    签到学习了很多。

    0

  7. [GetPortalCommentsPageByObjectIdResponse(id=1948413, encodeId=2ea81948413df, content=<a href='/topic/show?id=f53ae431863' target=_blank style='color:#2F92EE;'>#神经所#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=28, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=74318, encryptionId=f53ae431863, topicName=神经所)], attachment=null, authenticateStatus=null, createdAvatar=https://thirdqq.qlogo.cn/qqapp/101173734/363C99735735B7F4CB11D5F78F580525/100, createdBy=aab22500211, createdName=ms3025846204744509, createdTime=Tue Jan 09 18:32:00 CST 2018, time=2018-01-09, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1869914, encodeId=39a2186991427, content=<a href='/topic/show?id=fd764459a8' target=_blank style='color:#2F92EE;'>#Cell#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=20, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4459, encryptionId=fd764459a8, topicName=Cell)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=524d95, createdName=zhaozhouchifen, createdTime=Wed Aug 09 11:32:00 CST 2017, time=2017-08-09, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1960173, encodeId=4c2419601e3a0, content=<a href='/topic/show?id=dbe6445416' target=_blank style='color:#2F92EE;'>#CEL#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=28, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4454, encryptionId=dbe6445416, topicName=CEL)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=c3ff68, createdName=维他命, createdTime=Sun Sep 10 07:32:00 CST 2017, time=2017-09-10, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=189596, encodeId=e2e3189596e1, content=学习了很有用, beContent=null, objectType=article, channel=null, level=null, likeNumber=63, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/oLAjfB7s1ib3IzoRn621JdKCFUI4XvNELcibocrAVU6aUzEVDSaf3rYH08PUYUiagGqxAEhj8g9WqqNvD1CupIpCrmnR2OrqHZh/0, createdBy=7f181365728, createdName=飛歌, createdTime=Sat Apr 22 09:59:13 CST 2017, time=2017-04-22, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=189509, encodeId=3db7189509c6, content=感谢分享一下!!, beContent=null, objectType=article, channel=null, level=null, likeNumber=56, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=20971999626, createdName=laymankey, createdTime=Sat Apr 22 00:16:09 CST 2017, time=2017-04-22, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=189489, encodeId=387818948951, content=签到学习了很多。, beContent=null, objectType=article, channel=null, level=null, likeNumber=0, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=http://q.qlogo.cn/qqapp/1103841572/A3E53E62691178E2F18D7B999FD22131/100, createdBy=f44d2003846, createdName=Chongyang Zhang, createdTime=Fri Apr 21 23:27:14 CST 2017, time=2017-04-21, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=189467, encodeId=fc5718946e48, content=学习了很多的事情, beContent=null, objectType=article, channel=null, level=null, likeNumber=56, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/mStl88fu4NcXNhUvfhzd2dD8SUAwqrufRiaKMGaaBScoAzEicJJibuu3wCIWWQxoLgS2UOBx1vsPe3faZtAiatc0pTWlS6868zZH/0, createdBy=0a231960988, createdName=胖红, createdTime=Fri Apr 21 22:38:57 CST 2017, time=2017-04-21, status=1, ipAttribution=)]
    2017-04-21 胖红

    学习了很多的事情

    0