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Postsynaptic d1 glutamate receptor assembles and maintains hippocampal synapses via Cbln2 and neurexin
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Postsynaptic d1 glutamate receptor assembles and maintains hippocampal synapses via Cbln2 and neurexin
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Journal Article
Postsynaptic d1 glutamate receptor assembles and maintains hippocampal synapses via Cbln2 and neurexin
2018
Overview
The δ1 glutamate receptor (GluD1) was cloned decades ago and is widely expressed in many regions of the brain. However, its functional roles in these brain circuits remain unclear. Here, we find that GluD1 is required for both excitatory synapse formation and maintenance in the hippocampus. The action of GluD1 is absent in the Cbln2 knockout mouse. Furthermore, the GluD1 actions require the presence of presynaptic neurexin 1β carrying the splice site 4 insert (+S4). Together, our findings demonstrate that hippocampal synapse assembly and maintenance require a tripartite molecular complex in which the ligand Cbln2 binds with presynaptic neurexin 1β (+S4) and postsynaptic GluD1. We provide evidence that this mechanism may apply to other forebrain synapses, where GluD1 is widely expressed.
