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D-Serine regulates cerebellar LTD and motor coordination through the δ2 glutamate receptor

Abstract

D-Serine (D-Ser) is an endogenous co-agonist for NMDA receptors and regulates neurotransmission and synaptic plasticity in the forebrain. D-Ser is also found in the cerebellum during the early postnatal period. Although D-Ser binds to the δ2 glutamate receptor (GluD2, Grid2) in vitro, its physiological significance has remained unclear. Here we show that D-Ser serves as an endogenous ligand for GluD2 to regulate long-term depression (LTD) at synapses between parallel fibers and Purkinje cells in the immature cerebellum. D-Ser was released mainly from Bergmann glia after the burst stimulation of parallel fibers in immature, but not mature, cerebellum. D-Ser rapidly induced endocytosis of AMPA receptors and mutually occluded LTD in wild-type, but not Grid2-null, Purkinje cells. Moreover, mice expressing mutant GluD2 in which the binding site for D-Ser was disrupted showed impaired LTD and motor dyscoordination during development. These results indicate that glial D-Ser regulates synaptic plasticity and cerebellar functions by interacting with GluD2.

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Figure 1: D-Ser causes a decrease in PF-EPSCs through GluD2.
Figure 2: D-Ser induces AMPA receptor endocytosis by binding to GluD2.
Figure 3: Activity-dependent increase in extracellular [D-Ser] in immature wild-type cerebellar slices.
Figure 4: Endogenous D-Ser is released mainly from Bergmann glia and regulates LTD in the developing cerebellum.
Figure 5: Cerebellar LTD is enhanced by D-Ser binding to GluD2 in the developing cerebellum.
Figure 6: Disruption of D-Ser binding to GluD2 impaired motor coordination and learning in developing mice.
Figure 7: D-Ser conveys signals for LTD through the cytoplasmic C-terminal tails of GluD2 independent of its channel function but dependent on PKC activities in immature Purkinje cells.

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Acknowledgements

We appreciate Shiseido Co., Ltd. for their technical support concerning the 2D-HPLC analysis of D-Ser. We thank M. Watanabe for the antibodies to GluD2 and 3-PGDH, S. Nakanishi for the GFP-TeNT cDNA, M. Mishina for the Grid2-null mouse, and T. Takahashi, S. Jitsuki and T. Nishikawa for comments. This work was supported by a Grant-in-Aid for the Ministry of Education, Culture, Sports, Science and Technology of Japan (M.Y. and W.K.), Core Research for Evolutional Science and Technology from the Japanese Science and Technology Agency (M.Y.), Keio Gijuku Academic Development Funds (W.K.), the Keio University Medical Science Fund, Research Grants for Life Science and Medicine (W.K.), the Naito Foundation Subsidy for Promotion of Specific Research Projects (W.K.) and the Takeda Science Foundation (M.Y.).

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W.K. designed the experiments, performed the electrophysiological, immunohistochemical and behavioral studies, analyzed the data, and wrote the manuscript. Y.M., K.H. and K.Z. performed 2D-HPLC analysis. S.M. and K.M. performed cell surface staining. K.K. prepared the recombinant viruses and performed the biochemical analysis. K.E. supported behavioral experiments. J.M. performed biochemical assays and maintained mouse lines. R.K. provided the Dao−/− mouse. M.Y. supervised the project, designed the experiments and wrote the manuscript.

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Correspondence to Michisuke Yuzaki.

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Kakegawa, W., Miyoshi, Y., Hamase, K. et al. D-Serine regulates cerebellar LTD and motor coordination through the δ2 glutamate receptor. Nat Neurosci 14, 603–611 (2011). https://doi.org/10.1038/nn.2791

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