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Hoy, Jennifer L.; Constable, John R.; Vicini, Stefano; Fu, Zhanyan; Washbourne, Philip
Molecular and cellular neuroscience, 11/2009, Volume: 42, Issue: 4Journal Article
Cell adhesion molecules have been implicated as key organizers of synaptic structures, but there is still a need to determine how these molecules facilitate neurotransmitter receptor recruitment to developing synapses. Here, we identify erythrocyte protein band 4.1-like 3 (protein 4.1B) as an intracellular effector molecule of Synaptic Cell Adhesion Molecule 1 (SynCAM1) that is sufficient to recruit NMDA-type receptors (NMDARs) to SynCAM1 adhesion sites in COS7 cells. Protein 4.1B in conjunction with SynCAM1 also increased the frequency of NMDAR-mediated mEPSCs and area of presynaptic contact in an HEK293 cell/ neuron co-culture assay. Studies in cultured hippocampal neurons reveal that manipulation of protein 4.1B expression levels specifically affects NMDAR-mediated activity and localization. Finally, further experimentation in COS7 cells show that SynCAM1 may also interact with protein 4.1N to specifically effect AMPA type receptor (AMPAR) recruitment. Thus, SynCAM1 may recruit both AMPARs and NMDARs by independent mechanisms during synapse formation.
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