Intersecting circuits generate precisely patterned retinal waves.

Intersecting circuits generate precisely patterned retinal waves.
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DOI:
10.1016/j.neuron.2013.05.012
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发表时间:
2013-07-24
期刊:
影响因子:
16.2
通讯作者:
Kerschensteiner D
Kerschensteiner D
中科院分区:
医学1区
文献类型:
--
作者:
Akrouh A;Kerschensteiner D

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发育中的视网膜产生自发的谷氨酸能(III期)活动波,依次招募具有相反光反应(ON和OFF RGCs)的邻近神经节细胞。这种活动模式被认为有助于在下游视觉区域建立平行的ON和OFF通路。产生第三阶段波和使RGC放电不同步的电路仍然不清楚。使用双膜片钳记录,我们发现ON和OFF RGCs分别接受来自ON和OFF锥形双极细胞(CBCs)的顺序兴奋输入。这个输入序列是由交叉电路产生的,其中ON CBCs通过弥漫性分层抑制无分泌细胞控制OFF CBCs的谷氨酸释放。此外,相邻的ON CBCs通过侧谷氨酸能传递和间隙连接直接或间接地进行通信,这两者都是波的产生和传播所必需的。因此,交叉的横向兴奋性和垂直抑制性电路产生了精确模式的III期视网膜波。
The developing retina generates spontaneous glutamatergic (stage III) waves of activity that sequentially recruit neighboring ganglion cells with opposite light responses (ON and OFF RGCs). This activity pattern is thought to help establish parallel ON and OFF pathways in downstream visual areas. The circuits that produce stage III waves and desynchronize ON and OFF RGC firing remain obscure. Using dual patch clamp recordings, we find that ON and OFF RGCs receive sequential excitatory input from ON and OFF cone bipolar cells (CBCs), respectively. This input sequence is generated by crossover circuits, in which ON CBCs control glutamate release from OFF CBCs via diffusely stratified inhibitory amacrine cells. In addition, neighboring ON CBCs communicate directly and indirectly through lateral glutamatergic transmission and gap junctions, both of which are required for wave initiation and propagation. Thus, intersecting lateral excitatory and vertical inhibitory circuits give rise to precisely patterned stage III retinal waves.
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