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Rods in daylight act as relay cells for cone-driven horizontal cell–mediated surround inhibition

doi: 10.1038/nn.3852
pmid: 25344628
Rods in daylight act as relay cells for cone-driven horizontal cell–mediated surround inhibition
Vertebrate vision relies on two types of photoreceptors, rods and cones, which signal increments in light intensity with graded hyperpolarizations. Rods operate in the lower range of light intensities while cones operate at brighter intensities. The receptive fields of both photoreceptors exhibit antagonistic center-surround organization. Here we show that at bright light levels, mouse rods act as relay cells for cone-driven horizontal cell-mediated surround inhibition. In response to large, bright stimuli that activate their surrounds, rods depolarize. Rod depolarization increases with stimulus size, and its action spectrum matches that of cones. Rod responses at high light levels are abolished in mice with nonfunctional cones and when horizontal cells are reversibly inactivated. Rod depolarization is conveyed to the inner retina via postsynaptic circuit elements, namely the rod bipolar cells. Our results show that the retinal circuitry repurposes rods, when they are not directly sensing light, to relay cone-driven surround inhibition.
- University of Basel Switzerland
- French National Centre for Scientific Research France
- Sorbonne Paris Cité France
- Inserm France
- Yale University United States
Mice, Knockout, Neural Inhibition, Retinal Horizontal Cells, Mice, Inbred C57BL, Mice, HEK293 Cells, Retinal Rod Photoreceptor Cells, Retinal Cone Photoreceptor Cells, Animals, Humans, Nerve Net, Photic Stimulation
Mice, Knockout, Neural Inhibition, Retinal Horizontal Cells, Mice, Inbred C57BL, Mice, HEK293 Cells, Retinal Rod Photoreceptor Cells, Retinal Cone Photoreceptor Cells, Animals, Humans, Nerve Net, Photic Stimulation
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