A precisely timed asynchronous pattern of ON and OFF retinal ganglion cell activity during propagation of retinal waves

被引:68
作者
Kerschensteiner, Daniel [1 ]
Wong, Rachel O. L. [1 ]
机构
[1] Univ Washington, Dept Biol Struct, Seattle, WA 98195 USA
关键词
D O I
10.1016/j.neuron.2008.04.025
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
Patterns of coordinated spontaneous activity have been proposed to guide circuit refinement in many parts of the developing nervous system. It is unclear, however, how such patterns, which are thought to indiscriminately synchronize nearby cells, could provide the cues necessary to segregate functionally distinct circuits within overlapping cell populations. Here, we report that glutamatergic retinal waves possess a substructure in the bursting of neighboring retinal ganglion cells with opposite light responses (ON or OFF). Within a wave, cells fire repetitive non-overlapping bursts in a fixed order: ON before OFF. This pattern is absent from cholinergic waves, which precede glutamate-dependent activity, providing a developmental sequence of distinct activity-encoded cues. Asynchronous bursting of ON and OFF retinal ganglion cells depends on inhibition between these parallel pathways. Similar asynchronous activity patterns could arise throughout the nervous system, as inhibition matures and might help to separate connections of functionally distinct subnetworks.
引用
收藏
页码:851 / 858
页数:8
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