Neuron:为什么越抓越痒

2016-11-19 黄安娜 环球科学

大家肯定都有体验,本来只有一点痒,却越抓越痒;用指甲挠挠皮肤很舒服,可舒服实在太短暂,因为它往往会导致又一轮的瘙痒“攻击”。而这恶性循环的罪魁祸首竟然是一种被称作“快乐激素”的物质——5 -羟色胺(serotonin,一种神经递质)。科学家曾以为痒觉是痛觉的一种,属于比较轻微的痛觉。直到2009年,美国圣路易斯华盛顿大学痒觉研究中心(Center for the Study of Itch at

大家肯定都有体验,本来只有一点痒,却越抓越痒;用指甲挠挠皮肤很舒服,可舒服实在太短暂,因为它往往会导致又一轮的瘙痒“攻击”。而这恶性循环的罪魁祸首竟然是一种被称作“快乐激素”的物质——5 -羟色胺(serotonin,一种神经递质)。

科学家曾以为痒觉是痛觉的一种,属于比较轻微的痛觉。直到2009年,美国圣路易斯华盛顿大学痒觉研究中心(Center for the Study of Itch at Washington University in St. Louis)的陈宙峰(Zhou-Feng Chen)及同事在小鼠体内发现了专门传递痒觉的神经元,才把两者区分开来。尽管痛觉和痒觉并不完全相同,但二者还是存在密切关联,它们在大脑某一区域内共享同一神经回路。而正是因为共享回路,就导致激活了一方,另一方就被抑制——抓痒引起了痛觉,而痒觉的敏感性就降低,所以抓痒能短暂地消除痒觉。同时,抓痒还会释放出可降低痛觉的5-羟色胺。如此一来,抓痒就让人觉得很舒服,不痛也不痒了。但是最近,陈宙峰的团队研究表明,抓痒这个动作会加剧“痒-抓-痒”恶性循环。

一部分痒觉神经元受体,有助减弱痛觉,但另一部分受体又会引起痒觉。虽然5-羟色胺仅可与其中能减弱痛觉的那部分受体结合,但由于两部分受体彼此相邻,会互相作用,所以与减弱痛觉受体结合的5-羟色胺,也会间接影响增强痒觉受体,从而使人更痒。陈宙峰和同事发现,同时激活小鼠的这两组受体,比单独激活痒觉受体时,实验小鼠抓痒更为频繁。而在另一个实验中,使用的实验小鼠缺乏会产生5-羟色胺的细胞,结果与正常小鼠相比,这组实验小鼠在皮肤受刺激后,抓痒次数比较少。该研究结果已发表在《神经元》(Neuron)期刊上。

研究人员尚未在人体内发现专门传递痒觉的神经元(恒河猴体内有痒觉神经元)。不过,我们可以负责任地提醒大家,抓痒之前请三思。

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    2017-03-09 by2021
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    2016-11-20 KO229256262

    哇!终于有了根本性的解释,太爽了

    0

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    2016-11-20 mxc0712

    有意思(^_^)

    0

  4. [GetPortalCommentsPageByObjectIdResponse(id=1751820, encodeId=64651e5182066, content=<a href='/topic/show?id=9b6a12e0155' target=_blank style='color:#2F92EE;'>#Neuron#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=26, 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=Thu Mar 09 08:06:00 CST 2017, time=2017-03-09, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=157031, encodeId=24ee15e0313f, content=哇!终于有了根本性的解释,太爽了, beContent=null, objectType=article, channel=null, level=null, likeNumber=50, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://cdnapi.center.medsci.cn/medsci/head/2017/12/17/3872cad7a53dc9dcbd08202fb6313cf4.jpg, createdBy=2cb71609450, createdName=KO229256262, createdTime=Sun Nov 20 09:49:49 CST 2016, time=2016-11-20, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=157022, encodeId=046e15e02221, content=有意思(^_^), beContent=null, objectType=article, channel=null, level=null, likeNumber=54, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/vi_32/ajNVdqHZLLCl1NoqHGKCG3ichrqjRBLacc6IriaZe9LQSPDhQKMvgzGy2IvlLN8fcHAuWQ3O30YNfZu2C5CHice9w/0, createdBy=376e1607370, createdName=mxc0712, createdTime=Sun Nov 20 09:29:16 CST 2016, time=2016-11-20, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=156832, encodeId=c6551568329a, content=分析透彻, beContent=null, objectType=article, channel=null, level=null, likeNumber=60, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=http://cacheapi.medsci.cn/resource/upload/20151110/IMG5641A6F12C0732294.jpg, createdBy=2f901662448, createdName=乐奕11, createdTime=Sat Nov 19 11:20:09 CST 2016, time=2016-11-19, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=156820, encodeId=cc0515682012, content=不错,学习了, beContent=null, objectType=article, channel=null, level=null, likeNumber=48, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=418d1603809, createdName=jiuling, createdTime=Sat Nov 19 11:01:37 CST 2016, time=2016-11-19, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=156779, encodeId=4d56156e795c, content=学习了,治疗有没有更好的方式、方法?, beContent=null, objectType=article, channel=null, level=null, likeNumber=57, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=http://cacheapi.medsci.cn/resource/upload/20161119/IMG582F9E8AB614E9731.jpg, createdBy=21381741631, createdName=坦然面对, createdTime=Sat Nov 19 08:30:49 CST 2016, time=2016-11-19, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=156775, encodeId=9b90156e75fb, content=非常不错?痒和痛神经纤维真的可以分开了?, beContent=null, objectType=article, channel=null, level=null, likeNumber=19, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=445f1740270, createdName=meiliwuxian, createdTime=Sat Nov 19 08:05:27 CST 2016, time=2016-11-19, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=156724, encodeId=92ce156e247d, content=不错,学习新知识。, beContent=null, objectType=article, channel=null, level=null, likeNumber=24, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=http://cdnapi.center.medsci.cn/medsci/head/2017/04/21/72142930668371951a41ef4ea4b233e6.jpg, createdBy=dcbc1715228, createdName=刘煜, createdTime=Sat Nov 19 05:52:36 CST 2016, time=2016-11-19, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=156720, encodeId=4c8a156e2010, content=不错,学习了!, beContent=null, objectType=article, channel=null, level=null, likeNumber=16, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/NUyjXTCJjo5nmIH5IQqCKjJgSCuicPWUWOUcdqt1ROPnEiaOYN4pSHibDv8la3OxNLalvuvUXn8clpJlrpuyTpckgt9OPkeSSdT/0, createdBy=8fd71930726, createdName=半夏微凉, createdTime=Sat Nov 19 04:16:06 CST 2016, time=2016-11-19, status=1, ipAttribution=)]
    2016-11-19 乐奕11

    分析透彻

    0

  5. [GetPortalCommentsPageByObjectIdResponse(id=1751820, encodeId=64651e5182066, content=<a href='/topic/show?id=9b6a12e0155' target=_blank style='color:#2F92EE;'>#Neuron#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=26, 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=Thu Mar 09 08:06:00 CST 2017, time=2017-03-09, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=157031, encodeId=24ee15e0313f, content=哇!终于有了根本性的解释,太爽了, beContent=null, objectType=article, channel=null, level=null, likeNumber=50, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://cdnapi.center.medsci.cn/medsci/head/2017/12/17/3872cad7a53dc9dcbd08202fb6313cf4.jpg, createdBy=2cb71609450, createdName=KO229256262, createdTime=Sun Nov 20 09:49:49 CST 2016, time=2016-11-20, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=157022, encodeId=046e15e02221, content=有意思(^_^), beContent=null, objectType=article, channel=null, level=null, likeNumber=54, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/vi_32/ajNVdqHZLLCl1NoqHGKCG3ichrqjRBLacc6IriaZe9LQSPDhQKMvgzGy2IvlLN8fcHAuWQ3O30YNfZu2C5CHice9w/0, createdBy=376e1607370, createdName=mxc0712, createdTime=Sun Nov 20 09:29:16 CST 2016, time=2016-11-20, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=156832, encodeId=c6551568329a, content=分析透彻, beContent=null, objectType=article, channel=null, level=null, likeNumber=60, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=http://cacheapi.medsci.cn/resource/upload/20151110/IMG5641A6F12C0732294.jpg, createdBy=2f901662448, createdName=乐奕11, createdTime=Sat Nov 19 11:20:09 CST 2016, time=2016-11-19, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=156820, encodeId=cc0515682012, content=不错,学习了, beContent=null, objectType=article, channel=null, level=null, likeNumber=48, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=418d1603809, createdName=jiuling, createdTime=Sat Nov 19 11:01:37 CST 2016, time=2016-11-19, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=156779, encodeId=4d56156e795c, content=学习了,治疗有没有更好的方式、方法?, beContent=null, objectType=article, channel=null, level=null, likeNumber=57, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=http://cacheapi.medsci.cn/resource/upload/20161119/IMG582F9E8AB614E9731.jpg, createdBy=21381741631, createdName=坦然面对, createdTime=Sat Nov 19 08:30:49 CST 2016, time=2016-11-19, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=156775, encodeId=9b90156e75fb, content=非常不错?痒和痛神经纤维真的可以分开了?, beContent=null, objectType=article, channel=null, level=null, likeNumber=19, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=445f1740270, createdName=meiliwuxian, createdTime=Sat Nov 19 08:05:27 CST 2016, time=2016-11-19, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=156724, encodeId=92ce156e247d, content=不错,学习新知识。, beContent=null, objectType=article, channel=null, level=null, likeNumber=24, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=http://cdnapi.center.medsci.cn/medsci/head/2017/04/21/72142930668371951a41ef4ea4b233e6.jpg, createdBy=dcbc1715228, createdName=刘煜, createdTime=Sat Nov 19 05:52:36 CST 2016, time=2016-11-19, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=156720, encodeId=4c8a156e2010, content=不错,学习了!, beContent=null, objectType=article, channel=null, level=null, likeNumber=16, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/NUyjXTCJjo5nmIH5IQqCKjJgSCuicPWUWOUcdqt1ROPnEiaOYN4pSHibDv8la3OxNLalvuvUXn8clpJlrpuyTpckgt9OPkeSSdT/0, createdBy=8fd71930726, createdName=半夏微凉, createdTime=Sat Nov 19 04:16:06 CST 2016, time=2016-11-19, status=1, ipAttribution=)]
    2016-11-19 jiuling

    不错,学习了

    0

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    2016-11-19 坦然面对

    学习了,治疗有没有更好的方式、方法?

    0

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    2016-11-19 meiliwuxian

    非常不错?痒和痛神经纤维真的可以分开了?

    0

  8. [GetPortalCommentsPageByObjectIdResponse(id=1751820, encodeId=64651e5182066, content=<a href='/topic/show?id=9b6a12e0155' target=_blank style='color:#2F92EE;'>#Neuron#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=26, 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=Thu Mar 09 08:06:00 CST 2017, time=2017-03-09, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=157031, encodeId=24ee15e0313f, content=哇!终于有了根本性的解释,太爽了, beContent=null, objectType=article, channel=null, level=null, likeNumber=50, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://cdnapi.center.medsci.cn/medsci/head/2017/12/17/3872cad7a53dc9dcbd08202fb6313cf4.jpg, createdBy=2cb71609450, createdName=KO229256262, createdTime=Sun Nov 20 09:49:49 CST 2016, time=2016-11-20, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=157022, encodeId=046e15e02221, content=有意思(^_^), beContent=null, objectType=article, channel=null, level=null, likeNumber=54, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/vi_32/ajNVdqHZLLCl1NoqHGKCG3ichrqjRBLacc6IriaZe9LQSPDhQKMvgzGy2IvlLN8fcHAuWQ3O30YNfZu2C5CHice9w/0, createdBy=376e1607370, createdName=mxc0712, createdTime=Sun Nov 20 09:29:16 CST 2016, time=2016-11-20, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=156832, encodeId=c6551568329a, content=分析透彻, beContent=null, objectType=article, channel=null, level=null, likeNumber=60, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=http://cacheapi.medsci.cn/resource/upload/20151110/IMG5641A6F12C0732294.jpg, createdBy=2f901662448, createdName=乐奕11, createdTime=Sat Nov 19 11:20:09 CST 2016, time=2016-11-19, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=156820, encodeId=cc0515682012, content=不错,学习了, beContent=null, objectType=article, channel=null, level=null, likeNumber=48, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=418d1603809, createdName=jiuling, createdTime=Sat Nov 19 11:01:37 CST 2016, time=2016-11-19, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=156779, encodeId=4d56156e795c, content=学习了,治疗有没有更好的方式、方法?, beContent=null, objectType=article, channel=null, level=null, likeNumber=57, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=http://cacheapi.medsci.cn/resource/upload/20161119/IMG582F9E8AB614E9731.jpg, createdBy=21381741631, createdName=坦然面对, createdTime=Sat Nov 19 08:30:49 CST 2016, time=2016-11-19, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=156775, encodeId=9b90156e75fb, content=非常不错?痒和痛神经纤维真的可以分开了?, beContent=null, objectType=article, channel=null, level=null, likeNumber=19, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=445f1740270, createdName=meiliwuxian, createdTime=Sat Nov 19 08:05:27 CST 2016, time=2016-11-19, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=156724, encodeId=92ce156e247d, content=不错,学习新知识。, beContent=null, objectType=article, channel=null, level=null, likeNumber=24, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=http://cdnapi.center.medsci.cn/medsci/head/2017/04/21/72142930668371951a41ef4ea4b233e6.jpg, createdBy=dcbc1715228, createdName=刘煜, createdTime=Sat Nov 19 05:52:36 CST 2016, time=2016-11-19, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=156720, encodeId=4c8a156e2010, content=不错,学习了!, beContent=null, objectType=article, channel=null, level=null, likeNumber=16, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/NUyjXTCJjo5nmIH5IQqCKjJgSCuicPWUWOUcdqt1ROPnEiaOYN4pSHibDv8la3OxNLalvuvUXn8clpJlrpuyTpckgt9OPkeSSdT/0, createdBy=8fd71930726, createdName=半夏微凉, createdTime=Sat Nov 19 04:16:06 CST 2016, time=2016-11-19, status=1, ipAttribution=)]
    2016-11-19 刘煜

    不错,学习新知识。

    0

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    2016-11-19 半夏微凉

    不错,学习了!

    0

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