Abstract
The absence of the chloride channel CLC-3 in Clcn3−/− mice results in hippocampal degeneration with a distinct temporal-spatial sequence that resembles neuronal loss in temporal lobe epilepsy. We examined how the loss of CLC-3 might affect GABAergic synaptic transmission in the hippocampus. An electrophysiological study of synaptic function in hippocampal slices taken from Clcn3−/− mice before the onset of neurodegeneration revealed a substantial decrease in the amplitude and frequency of miniature inhibitory postsynaptic currents compared with those in wild-type slices. We found that CLC-3 colocalized with the vesicular GABA transporter VGAT in the CA1 region of the hippocampus. Acidification of inhibitory synaptic vesicles induced by Cl− showed a marked dependence on CLC-3 expression. The decrease in inhibitory transmission in Clcn3−/− mice suggests that the neurotransmitter loading of synaptic vesicles was reduced, which we attribute to defective vesicular acidification. Our observations extend the role of Cl− in inhibitory transmission from that of a postsynaptic permeant species to a presynaptic regulatory element.
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Acknowledgements
We thank A. Fox, S. Takamori, R. Edwards, L. Farmer and R. Sarac for conversations, V. Bindokas and P. Toth for technical help with microscopy, Y. Chen for help with immuno-electron microscopy, and F. Lamb (Univ. Iowa) for the Clcn3−/− strain. The study was supported by NIH R01 GM36823 and NIH R01 DK 080364 to D.J.N.
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V.R., L.V.D. and D.J.N. designed the project, analyzed the data and wrote the manuscript. V.R, L.V.D., P.D.S., B.L. and E.A.G. performed the experiments.
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Riazanski, V., Deriy, L., Shevchenko, P. et al. Presynaptic CLC-3 determines quantal size of inhibitory transmission in the hippocampus. Nat Neurosci 14, 487–494 (2011). https://doi.org/10.1038/nn.2775
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DOI: https://doi.org/10.1038/nn.2775
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