The sodium-bicarbonate cotransporter Slc4a5 mediates feedback at the first synapse of vision.

ABSTRACT: Feedback at the photoreceptor synapse is the first neuronal circuit computation in vision, which influences downstream activity patterns within the visual system. Yet, the identity of the feedback signal and the mechanism of synaptic transmission are still not well understood. Here, we combined perturbations of cell-type-specific genes of mouse horizontal cells with two-photon imaging of the result of light-induced feedback in cones and showed that the electrogenic bicarbonate transporter Slc4a5, but not the electroneutral bicarbonate transporter Slc4a3, both expressed specifically in horizontal cells, is necessary for horizontal cell-to-cone feedback. Pharmacological blockage of bicarbonate transporters and buffering pH also abolished the feedback but blocking sodium-proton exchangers and

SUBMITTER: Morikawa R 

PROVIDER: S-EPMC11602199 | biostudies-literature | 2024 Nov

REPOSITORIES: biostudies-literature