The circadian clock in the retina controls rod-cone coupling.

The circadian clock in the retina controls rod-cone coupling.
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DOI:
10.1016/j.neuron.2008.07.017
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发表时间:
2008-09-11
期刊:
影响因子:
16.2
通讯作者:
Mangel SC
Mangel SC
中科院分区:
医学1区
文献类型:
--
作者:
Ribelayga C;Cao Y;Mangel SC

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Although rod and cone photoreceptor cells in the vertebrate retina are anatomically connected or coupled by gap junctions, rod-cone coupling is thought to be weak. By using a combination of tracer labeling and electrical recording in the goldfish retina and tracer labeling in the mouse retina, we show that the retinal circadian clock, a local endogenous process, and not the retinal response to the visual environment, controls the extent and strength of rod-cone coupling by activating dopamine D2-like receptors in the day, so that rod-cone coupling is weak during the day but remarkably robust at night. The results demonstrate that circadian control of rod-cone coupling serves as a synaptic switch between the rod and cone pathways, so that cones and neurons postsynaptic to cones receive very dim light signals from rods at night, but not in the day. The increase in the strength and extent of rod-cone coupling at night may enhance the reliability of the rod light response and facilitate the detection of large dim objects.
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