期刊
NATURE NEUROSCIENCE
卷 15, 期 1, 页码 81-U106出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/nn.2995
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资金
- UK Medical Research Council
- European Union
- RIKEN Brain Science Institute
- Medical Research Council [MC_U122669937] Funding Source: researchfish
- MRC [MC_U122669937] Funding Source: UKRI
N-cadherin is a homophilic adhesion protein that remains expressed at mature excitatory synapses beyond its developmental role in synapse formation. We investigated the trans-synaptic activity of N-cadherin in regulating synapse function in rodent cultured hippocampal neurons using optical methods and electrophysiology. Interfering with N-cadherin in postsynaptic neurons reduced basal release probability (p(r)) at inputs to the neuron, and this trans-synaptic impairment of release accompanied impaired vesicle endocytosis. Moreover, loss of the GluA2 AMPA-type glutamate receptor subunit, which decreased p(r) by itself, occluded the interference with postsynaptic N-cadherin. The loss of postsynaptic N-cadherin activity, however, did not affect the compensatory upregulation of p(r) induced by chronic activity silencing, whereas postsynaptic beta-catenin deletion blocked this presynaptic homeostatic adaptation. Our findings suggest that postsynaptic N-cadherin helps link basal pre- and postsynaptic strengths to control the p(r) offset, whereas the p(r) gain adjustment requires a distinct trans-synaptic pathway involving beta-catenin.
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