Spatial-temporal patterns of retinal waves underlying activity-dependent refinement of retinofugal projections.

Spatial-temporal patterns of retinal waves underlying activity-dependent refinement of retinofugal projections.
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DOI:
10.1016/j.neuron.2009.09.021
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发表时间:
2009-10-29
期刊:
影响因子:
16.2
通讯作者:
Feldheim, David A.
Feldheim, David A.
中科院分区:
医学1区
文献类型:
--
作者:
Stafford, Ben K.;Sher, Alexander;Litke, Alan M.;Feldheim, David A.

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在发育过程中,视网膜轴突在其中央视觉目标内粗略地投射,然后再精细地形成精确组织的突触连接。自发的视网膜活动,在乙酰胆碱驱动的视网膜波的形式,被广泛认为是必要的建立这些精确的投影模式。特别是,在缺乏烟碱乙酰胆碱受体β2亚基(β 2 KO)的小鼠中,视网膜神经节细胞(RGC)的轴突末梢和大脑视觉区神经元的感受野大小都较大。在这里,使用大规模,高密度的多电极阵列,同时记录数百个RGC的单单位活动,我们提出了野生型(WT)和β2KO视网膜的出生后早期视网膜活动的分析。我们发现β2KO视网膜具有相关的活性模式,但这些模式的许多方面与WT视网膜不同。这些差异的定量分析表明,波的方向性,再加上短距离相关的爆发模式的RGCs,一起工作,以推动细化视网膜的预测。
During development, retinal axons project coarsely within their central visual targets before refining to form precisely organized synaptic connections. Spontaneous retinal activity, in the form of acetylcholine-driven retinal waves, is widely proposed to be necessary for establishing these precise projection patterns. In particular, both axonal terminations of retinal ganglion cells (RGCs) and the size of receptive fields of neurons in visual areas of the brain are larger in mice that lack the β2 subunit of the nicotinic acetylcholine receptor (β2KO). Here, using a large-scale, high-density multi-electrode array to record single-unit activity from hundreds of RGCs simultaneously, we present analysis of early post-natal retinal activity from both wild type (WT) and β2KO retinas. We find that β2KO retinas have correlated patterns of activity, but many aspects of these patterns differ from those of WT retina. Quantitative analysis of these differences suggests that wave directionality, coupled with short-distance correlated bursting patterns of RGCs, work together to drive refinement of retinofugal projections.
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