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- W2059989672 abstract "Parallel visual pathways are initiated at the first retinal synapse by signaling between the rod and cone photoreceptors and two general classes of bipolar cells. For normal function, ON or depolarizing bipolar cells (DBCs) require the G-protein-coupled receptor, mGluR6, an intact G-protein-coupled cascade and the transient receptor potential melastatin 1 (TRPM1) cation channel. In addition, another seven transmembrane protein, GPR179, is required for DBC function and recruits the regulators of G-protein signaling (RGS) proteins, RGS7 and RGS11, to the dendritic tips of the DBCs. Here we use the Gpr179 nob5 mouse, which lacks GPR179 and has a no b-wave electroretinogram (ERG) phenotype, to demonstrate that despite the absence of both GPR179 and RGS7/RGS11, a small dark-adapted ERG b-wave remains and can be enhanced with long duration flashes. Consistent with the ERG, the mGluR6-mediated gating of TRPM1 can be evoked pharmacologically in Gpr179 nob5 and RGS7 −/− / RGS11 −/− rod BCs if strong stimulation conditions are used. In contrast, direct gating of TRPM1 by capsaicin in RGS7 −/− / RGS11 −/− and WT rod BCs is similar, but severely compromised in Gpr179 nob5 rod BCs. Noise and standing current analyses indicate that the remaining channels in Gpr179 nob5 and RGS7 −/− / RGS11 −/− rod BCs have a very low open probability. We propose that GPR179 along with RGS7 and RGS11 controls the ability of the mGluR6 cascade to gate TRPM1. In addition to its role in localizing RGS7 and RGS11 to the dendritic tips, GPR179 via a direct interaction with the TRPM1 channel alters its ability to be gated directly by capsaicin." @default.
- W2059989672 created "2016-06-24" @default.
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- W2059989672 date "2014-04-30" @default.
- W2059989672 modified "2023-10-16" @default.
- W2059989672 title "GPR179 Is Required for High Sensitivity of the mGluR6 Signaling Cascade in Depolarizing Bipolar Cells" @default.
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- W2059989672 doi "https://doi.org/10.1523/jneurosci.4044-13.2014" @default.
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