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- Title
Glycine input induces the synaptic facilitation in salamander rod photoreceptors.
- Authors
Wen Shen; Zheng Jiang; Baoqin Li
- Abstract
Glycinergic synapses in photoreceptors are made by centrifugal feedback neurons in the network, but the function of the synapses is largely unknown. Here we report that glycinergic input enhances photoreceptor synapses in amphibian retinas. Using specific antibodies against a glycine transporter (GlyT2) and glycine receptor β subunit, we identified the morphology of glycinergic input in photoreceptor terminals. Electrophysiological recordings indicated that 10 μM glycine depolarized rods and activated voltage-gated Ca2+ channels in the neurons. The effects facilitated glutamate vesicle release in photoreceptors, meanwhile increased the spontaneous excitatory postsynaptic currents in Off-bipolar cells. Endogenous glycine feedback also enhanced glutamate transmission in photoreceptors. Additionally, inhibition of a Cl− uptake transporter NKCC1 with bumetanid effectively eliminated glycine-evoked a weak depolarization in rods, suggesting that NKCC1 maintains a high Cl− level in rods, which causes to depolarize in responding to glycine input. This study reveals a new function of glycine in retinal synaptic transmission.
- Subjects
PHOTORECEPTORS; PHOTOBIOLOGY; GLYCINE; CELLS; GLUTAMIC acid
- Publication
Journal of Biomedical Science, 2008, Vol 15, Issue 6, p743
- ISSN
1021-7770
- Publication type
Article
- DOI
10.1007/s11373-008-9263-x