Subcellular topography of visually driven dendritic activity in the vertebrate visual system.

Subcellular topography of visually driven dendritic activity in the vertebrate visual system.
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DOI:
10.1016/j.neuron.2009.01.018
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发表时间:
2009-03-26
期刊:
影响因子:
16.2
通讯作者:
Engert, Florian
Engert, Florian
中科院分区:
医学1区
文献类型:
--
作者:
Bollmann, Johann H.;Engert, Florian

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从感觉器官投射到高级大脑中心的神经路径形成了地形图,在地形图中,邻居关系被保存下来,从发送到接收的神经群体。感觉输入可以在接受神经元的树突中产生分隔的电和生化活动。在这里,我们表明,在幼年非洲爪哇蝌蚪发育中的视网膜顶盖投射中,视觉驱动的钙信号是在亚细胞、树突尺度上的地形图组织。功能体内双光子钙离子成像显示,树突状钙信号对视觉空间刺激位置的敏感性与它们在单个神经元树突树中的解剖位置有关。这种地形图分布依赖于NMDAR的激活,而全球钙信号是通过树突电压依赖性钙通道的钙内流来调节的。这些发现提出了一个可塑性模型的框架,该模型在神经连通性和树突特异性信息存储的阐述中调用局部树突状钙信号。
Neural pathways projecting from sensory organs to higher brain centers form topographic maps in which neighbor relationships are preserved from a sending to a receiving neural population. Sensory input can generate compartmentalized electrical and biochemical activity in the dendrites of a receiving neuron. Here, we show that in the developing retinotectal projection of young Xenopus tadpoles, visually driven Ca2+ signals are topographically organized at the subcellular, dendritic scale. Functional in vivo two-photon Ca2+ imaging revealed that the sensitivity of dendritic Ca2+ signals to stimulus location in visual space is correlated with their anatomical position within the dendritic tree of individual neurons. This topographic distribution was dependent on NMDAR activation, whereas global Ca2+ signals were mediated by Ca2+ influx through dendritic, voltage-dependent Ca2+ channels. These findings suggest a framework for plasticity models that invoke local dendritic Ca2+ signaling in the elaboration of neural connectivity and dendrite-specific information storage.
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