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- W2039940743 abstract "It has been widely accepted that ON and OFF channels in the visual system are segregated with little cross-communication, except for the mammalian rod bipolar cell-AII amacrine cell-ganglion cell pathway. Here, we show that in the tiger salamander retina the light responses of a subpopulation of ON–OFF ganglion cells are mediated by crossing the ON and OFF bipolar cell pathways. Although the majority of ON–OFF ganglion cells (type I cells) receive direct excitatory inputs from depolarizing and hyperpolarizing bipolar cells (DBCs and HBCs), about 5% (type II cells) receive indirect excitatory inputs from DBCs and 20% (type III cells) receive indirect excitatory inputs from HBCs. These indirect bipolar cell inputs are likely to be mediated by a subpopulation of amacrine cells that exhibit transient hyperpolarizing light responses (ACHs) and make GABAergic/glycinergic synapses on DBC or HBC axon terminals. GABA and glycine receptor antagonists enhanced the ON and OFF excitatory cation current (ΔIC) in type I ganglion cells, but completely suppressed the ON ΔIC mediated by DBCs in type II cells and the OFF ΔIC mediated by HBCs in types III cells. Dendrites of type I cells ramify in both sublamina A and B, type II cells exclusively in sublamina A, and type III cells exclusively in sublamina B of the inner plexiform layer. These results demonstrate that indirect, amacrine cell-mediated bipolar cell-ganglion cell synaptic pathways exist in a non-mammalian retina, and that bidirectional cross-talk between ON and OFF channels is present in the vertebrate retina." @default.
- W2039940743 created "2016-06-24" @default.
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- W2039940743 date "2007-02-01" @default.
- W2039940743 modified "2023-10-17" @default.
- W2039940743 title "Cross-talk between ON and OFF channels in the salamander retina: Indirect bipolar cell inputs to ON–OFF ganglion cells" @default.
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- W2039940743 doi "https://doi.org/10.1016/j.visres.2006.09.021" @default.
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