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The CNS synapse is an adhesive junction differentiated for chemical neurotransmission and is equipped with presynaptic vesicles and postsynaptic neurotransmitter receptors. Cell adhesion molecule cadherins not only maintain connections between pre- and postsynaptic membranes but also modulate the efficacy of synaptic transmission. Although the components of the cadherin-mediated adhesive apparatus...
Plexin-B1, Sema4D receptor, mediates retraction and extension signals in axon guidance by associating with PDZ-containing Rho guanine nucleotide exchange factors (PDZ-RhoGEFs) which can activate a small Rho GTPase RhoA. RhoA is implicated in spine formation by rearranging actin cytoskeleton. Exogenous application of Sema4D to cultured neurons caused activation of RhoA, increase of spine density and...
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