A noncanonical inhibitory circuit dampens behavioral sensitivity to light.

A noncanonical inhibitory circuit dampens behavioral sensitivity to light.
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DOI:
10.1126/science.aay3152
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发表时间:
2020-05-01
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Schmidt TM
Schmidt TM
中科院分区:
其他
文献类型:
--
作者:
Sonoda T;Li JY;Hayes NW;Chan JC;Okabe Y;Belin S;Nawabi H;Schmidt TM

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视网膜神经节细胞(RGC)驱动从有意识的视觉感知到潜意识的非图像形成行为的各种光诱发行为。据认为,RGC主要通过释放兴奋性神经递质谷氨酸来驱动这些功能。我们确定了一个子集的黑视素表达,内在光敏RGC(ipRGC)在小鼠中释放抑制性神经递质GABA在非图像形成的大脑目标。从ipRGC释放GABA抑制了瞳孔光反射和昼夜光诱导的敏感性,将这些行为的动态范围转移到更高的光水平。我们的研究结果确定了视网膜中的抑制性RGC群体,并提供了一个电路水平的机制,有助于在低光下非图像形成行为的相对不敏感性。在这里,我们确定了从眼睛到大脑的GABA能回路,它抑制了非图像形成视觉行为的敏感性。
Retinal ganglion cells (RGCs) drive diverse, light-evoked behaviors from conscious visual perception to subconscious, non-image forming behaviors. It is thought that RGCs primarily drive these functions through the release of the excitatory neurotransmitter glutamate. We identified a subset of melanopsin-expressing, intrinsically photosensitive RGCs (ipRGCs) in mice that release the inhibitory neurotransmitter GABA at non-image forming brain targets. GABA release from ipRGCs dampened the sensitivity of both the pupillary light reflex and circadian photoentrainment, shifting the dynamic range of these behaviors to higher light levels. Our results identify an inhibitory RGC population in the retina and provide a circuit-level mechanism that contributes to the relative insensitivity of non-image forming behaviors at low light. Here we identify a GABAergic circuit from the eye to the brain that dampens the sensitivity of non-image forming visual behaviors.
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