Abstract
Fast excitatory synaptic transmission through vertebrate autonomic ganglia is mediated by postsynaptic nicotinic acetylcholine receptors (nAChRs). We demonstrate a unique postsynaptic receptor microheterogeneity on chick parasympathetic ciliary ganglion neurons—under one presynaptic terminal, nAChRs and glycine receptors formed separate but proximal clusters. Terminals were loaded with [3H]glycine via the glycine transporter-1 (GlyT-1), which localized to the cholinergic presynaptic terminal membrane; depolarization evoked [3H]glycine release that was calcium independent and blocked by the GlyT-1 inhibitor sarcosine. Ganglionic synaptic transmission mediated by nAChRs was attenuated by glycine. Coexistence of separate clusters of receptors with opposing functions under one terminal contradicts Dale's principle and provides a new mechanism for modulating synaptic activity in vivo.
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Acknowledgements
We acknowledge Heinrich Betz for providing glycine receptor and gephyrin antibodies and clones, Yimen Ge (Massachusetts General Hospital, Harvard Medical School) for assistance with the laser-scanning confocal microscope and Kathleen Dunlap, Daniel Jay and Tim Turner for advice and comments on the manuscript. This work was supported by NIH grant 21725 to M.H.J.
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Tsen, G., Williams, B., Allaire, P. et al. Receptors with opposing functions are in postsynaptic microdomains under one presynaptic terminal. Nat Neurosci 3, 126–132 (2000). https://doi.org/10.1038/72066
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DOI: https://doi.org/10.1038/72066
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