慢性成像的大脑活动有意识的猴子
![(A) Somatotopic representation evoked by tactile stimulation to different body parts (Foot, Leg and Tail) by epifluorescence microscopy. Each response areas were overlaid on the image of the cortex with different colours (responses to foot in red, leg in green and tail in blue). ΔF/F: fluorescent intensity changes. (B) Macroscopic activity evoked by tactile stimulation to foot in the somatosensory cortex under the anesthetized (AN) and awake (AW) states. The activity area and peak amplitude evoked by electrical stimulation in awake state was obviously clearer than that in anesthetized state. (C) Cellular sensory responses in awake and anesthetized marmosets by 2-photon microscopy. (Upper left) 2-photon imaging of Ca2+-expressing cells in the foot-responsive region identified by epifluorescence microscopy (Figure B). (Upper middle and right) Stimulation-evoked activity maps (left: anesthetized and right: awake condition) of the field of view with pseudo-colored peak amplitude during stimulation. The peak amplitude evoked by electrical stimulation were clearly different between anesthetized and awake condition. (Bottom left) An expanded image of a white box in the upper-left image. The bottom-right traces indicate fluorescent intensity changes (ΔF/F). The neural responses (#1 to #5) could be observed in awake state. Black bars represent stimulation period. Credit: KING SKYFRONT 慢性成像醒着猴子的大脑活动](https://scx1.b-cdn.net/csz/news/800a/2017/chronicimagi.jpg)
观察大脑活动引起了科学家们的极大兴趣,在清醒状态,特别是学习进步的神经紊乱。狨猴,小灵长类动物居住在南美洲,是非常有用的易于处理的神经科学研究的动物模型,因为体型小,繁殖成功率高,但直到最近已经被证明很难形象动物大脑在清醒状态。
有利于松本和同事在川崎中央研究所实验动物,在日本与日本理化学研究所合作,展示了一种新的成像方法适合开展神经成像在清醒狨猴。团队设计了一个新颖的设备修复狨猴的身体在两种类型的显微镜数字化和2-photon显微镜等设备和系统的适应训练。
这些方法最小化图像运动产物,从而影响宏观的清晰和细胞功能。受到狨猴安装颅窗,和敏感的大脑区域感官刺激被注射了一种neuron-targeting病毒携带Ca2 +指标,神经活动发生时发出的荧光信号。
研究小组调查了触觉刺激反应诱发的脚,腿或尾巴醒着的状态并注明反应区域的差异称为“大脑地图”。他们进一步发现显著差异麻醉和清醒状态之间在大脑活动和空间格局的感官反应。
他们成功地长期成像大脑的活动为了应对触觉刺激在几个星期。他们突破持有重要含义为研究神经退行性疾病,如阿尔茨海默病和帕金森病。
进一步探索
更多信息:Yoshiyuki山田等。慢性多尺度成像清醒的神经活动常见的绒猴,科学报告(2016)。DOI: 10.1038 / srep35722
期刊信息:
科学报告
川崎重工提供的城市
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