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

Szikra, T and Trenholm, S and Drinnenberg, A and Juttner, J and Raics, Z and Farrow, K and Biel, M and Awatramani, G and Clark, DA and Sahel, JA and da Silveira, RA and Roska, B (2014) Rods in daylight act as relay cells for cone-driven horizontal cell-mediated surround inhibition. Nat Neurosci .

Abstract

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

Item Type: Article
Additional Information: NIBR author: Szikra, T institute: NIBR contributor address:
Date Deposited: 13 Oct 2015 13:11
Last Modified: 13 Oct 2015 13:11
URI: https://oak.novartis.com/id/eprint/24254

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