Nat Biotechnol: 新型光场显微镜高速记录大脑神经元活动和血流的快速动态变化

2020-08-14 神经所 神经所

该研究发展了一种新型体成像技术:共聚焦光场显微镜(Confocal light field microscopy),可以对活体动物深部脑组织中神经和血管网络进行快速大范围体成像。

2020年8月10日,《Nature Biotechnology》杂志在线发表了题为《共聚焦光场显微镜对小鼠和斑马鱼大脑快速体成像》的研究论文,该研究由中国科学院脑科学与智能技术卓越创新中心(神经科学研究所)、上海脑科学与类脑研究中心、神经科学国家重点实验室王凯研究组完成。该研究发展了一种新型体成像技术:共聚焦光场显微镜(Confocal light field microscopy),可以对活体动物深部脑组织中神经和血管网络进行快速大范围体成像。

DOI:doi.org/10.1038/s41587-020-0628-7

跨脑区大规模的神经元如何整合信息并影响行为是神经科学中的核心问题,解答这个问题需要在更高时空分辨率上捕捉大量神经元活动动态变化的工具。共聚焦显微镜和双光子显微镜等运用于活体脑成像的传统工具基于点扫描,时间分辨率较低,难以研究大范围脑区中神经元的快速变化。因此,近年来人们一直致力于开发更快的成像方法。在多种新技术中,光场显微镜尤其具有潜力,得到了广泛关注。其特点在于可以在相机的单次曝光瞬间,记录来自物体不同深度的信号,通过反卷积算法重构出整个三维体,实现快速体成像,在线虫、斑马鱼幼鱼等小型模式动物上已获得初步应用。

传统光场显微镜存在两个难以解决的问题,限制了其在生物成像上的广泛应用。首先,重构的结果会出现失真。2017年王凯研究组研发的新型扩增视场光场显微镜(eXtendedfield-of-view Light Field Microscopy, XLFM)有效解决了这个问题,并成功应用于自由行为斑马鱼幼鱼的全脑神经元功能成像上,首次三维记录了斑马鱼幼鱼在完整捕食行为中的全脑神经元活动的变化。其次,现有光场显微成像技术缺乏光学切片能力,无法对较厚组织,比如小鼠的大脑进行成像。让光场显微镜具有共聚焦显微镜一样的光学切片能力,滤除大样品中焦层之外的背景信号来提高信噪比,是提高成像质量、可广泛应用的关键所在。

然而,传统共聚焦显微镜采用激光逐点扫描和共轭点针孔检测来降低焦面外噪声的策略不适用于三维光场显微镜。面对这一挑战,研究团队创新提出广义共聚焦检测的概念,使其可以与光场显微镜的三维成像策略结合,在不牺牲体成像速度的前提下有效滤除背景噪声,大幅度提高了灵敏度和分辨率。这种新型的光场显微成像技术称为共聚焦光场显微镜。

图 1(上)共聚焦光场显微镜原理示意图。(下)不同于传统光场显微镜,共聚焦光场显微镜采用片状照明,选择性激发样本的一部分,在垂直照明的方向上扫描,采集到的信号被遮挡板过滤掉焦层范围之外的部分。对采集到的图像进行重构可以得到焦层内的三维信息。

研究团队在不同动物样品上测试了共聚焦光场显微镜的成像能力。首先,团队成员对包埋的活体斑马鱼幼鱼进行全脑钙成像,对比共聚焦和传统光场显微镜的成像结果,发现加入光学切片能力后,图像分辨率和信号噪声比显著提高,可以检测到更多较弱的钙活动。进一步的,将共聚焦光场显微镜和高速三维追踪系统结合,对自由行为的斑马鱼幼鱼进行全脑钙成像,在⌀ 800 μm x 200 μm的体积内达到了2 x 2 x 2.5 μm3的空间分辨率和6Hz的时间分辨率。

受益于更高的分辨率和灵敏度,可以识别出斑马鱼幼鱼在捕食草履虫过程中单个神经元的钙离子活动的变化。

图 2(左)斑马鱼幼鱼捕食行为的一个例子。0s 为斑马鱼吞食草履虫的时刻。(右)左图斑马鱼捕食行为中,共聚焦光场显微镜记录到的两个不同脑区的神经元活动。箭头所指为过程中激活的单个神经元。

进而,团队成员验证了共聚焦光场显微镜对小鼠大脑的成像效果,对清醒小鼠的视皮层进行钙成像,可以同时记录⌀ 800 μm x 150 μm的体积内近千个神经元的活动,最深可达约400 μm,并且连续5小时以上稳定记录超过10万帧,没有明显的光漂白。团队成员进一步尝试使用共聚焦光场显微镜对鼠脑中的血细胞进行成像,深度可达600 μm,拍摄速度70 Hz,同时记录上千根血管分支中群体血细胞的流动情况并计算血细胞的速度,相比之前的传统成像方法通量提高了百余倍。

图 3(左)共聚焦光场显微镜拍摄得到的小鼠视皮层中的复杂血管网络。6个在不同深度拍摄的体积连接为一个深度达600 μm的三维结构。(中)100 μm到250 μm深度血管网络的平面投影,颜色代表不同血管分支中血细胞的平均流速。(右)图中箭头所指的区域中五个血管分支在一段时间内流过血细胞数量的计数。

研究团队在自由行为的斑马鱼幼鱼和小鼠大脑上证明了共聚焦光场显微镜有更高的分辨率和灵敏度,这为研究大范围神经网络和血管网络的功能提供了新的工具。同时,该技术不仅适用脑组织的成像,还可以根据所需成像的样品种类灵活调整分辨率、成像范围和速度,应用在其他厚组织的快速动态成像中。

该研究在王凯研究员的指导下,主要由博士研究生张朕坤、白璐和助理研究员丛林共同完成,王凯研究组余鹏、张田蕾、中科大本科生石万卓、杜久林研究组李福宁也做出了重要贡献,杜久林研究员参与合作并给予指导意见。该研究得到了中科院脑智卓越中心实验动物平台的大力支持。研究获得了来自中国科技部、中国科学院、国家自然科学基金委员会和上海市的项目资助。

原始出处:Longfei Jia , Min Zhu , Chaojun Kong, et al. Imaging volumetric dynamics at high speed in mouse and zebrafish brain with confocal light field microscopy. Nature Biotechnology .

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createdAvatar=http://thirdwx.qlogo.cn/mmopen/vi_32/Q0j4TwGTfTI5V6pBDhhleaA9ZQaNgImyx09qqFom6WIvSGdUoWfKiaWCiaeUfnXMRECAMPA81Wkd4EOicrPibOTudQ/132, createdBy=b9382500209, createdName=ms6127405442416114, createdTime=Sat Mar 06 12:05:27 CST 2021, time=2021-03-06, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1927740, encodeId=b4a4192e7400e, content=<a href='/topic/show?id=a59234e3b4' target=_blank style='color:#2F92EE;'>#Biotech#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=48, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=3473, encryptionId=a59234e3b4, topicName=Biotech)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=226a143, createdName=cathymary, createdTime=Sat Mar 27 08:05:27 CST 2021, time=2021-03-27, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1919124, encodeId=b45a19191249a, content=<a href='/topic/show?id=4f26341994' target=_blank 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topicList=[TopicDto(id=59734, encryptionId=ab2159e343a, topicName=显微镜)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=54f9127, createdName=tulenzi, createdTime=Thu May 20 06:05:27 CST 2021, time=2021-05-20, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=809647, encodeId=a26180964ea0, content=好, beContent=null, objectType=article, channel=null, level=null, likeNumber=103, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://img.medsci.cn/20200817/2786f976001a4edd9a06b98ec2527751/bef891b389dd48d8a0076e15cba6fc86.jpg, createdBy=72015403602, createdName=ms5000001908858550, createdTime=Mon Aug 17 13:05:14 CST 2020, time=2020-08-17, status=1, ipAttribution=)]
    2021-03-27 cathymary
  4. 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topicList=[TopicDto(id=59734, encryptionId=ab2159e343a, topicName=显微镜)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=54f9127, createdName=tulenzi, createdTime=Thu May 20 06:05:27 CST 2021, time=2021-05-20, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=809647, encodeId=a26180964ea0, content=好, beContent=null, objectType=article, channel=null, level=null, likeNumber=103, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://img.medsci.cn/20200817/2786f976001a4edd9a06b98ec2527751/bef891b389dd48d8a0076e15cba6fc86.jpg, createdBy=72015403602, createdName=ms5000001908858550, createdTime=Mon Aug 17 13:05:14 CST 2020, time=2020-08-17, status=1, ipAttribution=)]
    2021-04-09 sunylz
  5. [GetPortalCommentsPageByObjectIdResponse(id=1954395, encodeId=60c81954395fc, content=<a href='/topic/show?id=f42e330843a' target=_blank style='color:#2F92EE;'>#动态变化#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=38, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=33084, encryptionId=f42e330843a, topicName=动态变化)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=55683, createdName=仁医06, createdTime=Wed Dec 30 04:05:27 CST 2020, time=2020-12-30, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1948408, encodeId=e11d194840827, content=<a href='/topic/show?id=9301e41785e' target=_blank style='color:#2F92EE;'>#神经元活动#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=47, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=74178, encryptionId=9301e41785e, topicName=神经元活动)], attachment=null, authenticateStatus=null, 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topicList=[TopicDto(id=59734, encryptionId=ab2159e343a, topicName=显微镜)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=54f9127, createdName=tulenzi, createdTime=Thu May 20 06:05:27 CST 2021, time=2021-05-20, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=809647, encodeId=a26180964ea0, content=好, beContent=null, objectType=article, channel=null, level=null, likeNumber=103, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://img.medsci.cn/20200817/2786f976001a4edd9a06b98ec2527751/bef891b389dd48d8a0076e15cba6fc86.jpg, createdBy=72015403602, createdName=ms5000001908858550, createdTime=Mon Aug 17 13:05:14 CST 2020, time=2020-08-17, status=1, ipAttribution=)]
    2021-05-07 liye789132251
  6. 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createdBy=8b8031759349, createdName=siiner, createdTime=Tue Sep 01 04:05:27 CST 2020, time=2020-09-01, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1703721, encodeId=42341e037217b, content=<a href='/topic/show?id=a8db4394487' target=_blank style='color:#2F92EE;'>#大脑神经#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=40, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=43944, encryptionId=a8db4394487, topicName=大脑神经)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=5d2b30558460, createdName=yangwen5719, createdTime=Wed Jun 23 10:05:27 CST 2021, time=2021-06-23, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1893804, encodeId=1448189380461, content=<a href='/topic/show?id=ab2159e343a' target=_blank style='color:#2F92EE;'>#显微镜#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=0, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=59734, encryptionId=ab2159e343a, topicName=显微镜)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=54f9127, createdName=tulenzi, createdTime=Thu May 20 06:05:27 CST 2021, time=2021-05-20, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=809647, encodeId=a26180964ea0, content=好, beContent=null, objectType=article, channel=null, level=null, likeNumber=103, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://img.medsci.cn/20200817/2786f976001a4edd9a06b98ec2527751/bef891b389dd48d8a0076e15cba6fc86.jpg, createdBy=72015403602, createdName=ms5000001908858550, createdTime=Mon Aug 17 13:05:14 CST 2020, time=2020-08-17, status=1, ipAttribution=)]
    2021-02-19 shock_melon
  7. 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createdBy=8b8031759349, createdName=siiner, createdTime=Tue Sep 01 04:05:27 CST 2020, time=2020-09-01, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1703721, encodeId=42341e037217b, content=<a href='/topic/show?id=a8db4394487' target=_blank style='color:#2F92EE;'>#大脑神经#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=40, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=43944, encryptionId=a8db4394487, topicName=大脑神经)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=5d2b30558460, createdName=yangwen5719, createdTime=Wed Jun 23 10:05:27 CST 2021, time=2021-06-23, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1893804, encodeId=1448189380461, content=<a href='/topic/show?id=ab2159e343a' target=_blank style='color:#2F92EE;'>#显微镜#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=0, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=59734, encryptionId=ab2159e343a, topicName=显微镜)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=54f9127, createdName=tulenzi, createdTime=Thu May 20 06:05:27 CST 2021, time=2021-05-20, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=809647, encodeId=a26180964ea0, content=好, beContent=null, objectType=article, channel=null, level=null, likeNumber=103, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://img.medsci.cn/20200817/2786f976001a4edd9a06b98ec2527751/bef891b389dd48d8a0076e15cba6fc86.jpg, createdBy=72015403602, createdName=ms5000001908858550, createdTime=Mon Aug 17 13:05:14 CST 2020, time=2020-08-17, status=1, ipAttribution=)]
    2020-09-01 siiner
  8. 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  9. 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topicList=[TopicDto(id=59734, encryptionId=ab2159e343a, topicName=显微镜)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=54f9127, createdName=tulenzi, createdTime=Thu May 20 06:05:27 CST 2021, time=2021-05-20, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=809647, encodeId=a26180964ea0, content=好, beContent=null, objectType=article, channel=null, level=null, likeNumber=103, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://img.medsci.cn/20200817/2786f976001a4edd9a06b98ec2527751/bef891b389dd48d8a0076e15cba6fc86.jpg, createdBy=72015403602, createdName=ms5000001908858550, createdTime=Mon Aug 17 13:05:14 CST 2020, time=2020-08-17, status=1, ipAttribution=)]
    2021-05-20 tulenzi
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    2020-08-17 ms5000001908858550

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