TY - JOUR
T1 - Spatial memory formation induces recruitment of NMDA receptor and PSD-95 to synaptic lipid rafts
AU - Delint-Ramírez, Ilse
AU - Salcedo-Tello, Pamela
AU - Bermudez-Rattoni, Federico
N1 - Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2008/8
Y1 - 2008/8
N2 - NMDA receptors (NMDARs) activation in the hippocampus and insular cortex is necessary for spatial memory formation. Recent studies suggest that localization of NMDARs to lipid rafts enhance their signalization, since the kinases that phosphorylate its subunits are present in larger proportion in lipid raft membrane microdomains. We sought to determine the possibility that NMDAR translocation to synaptic lipid rafts occurs during plasticity processes such as memory formation. Our results show that water maze training induces a rapid recruitment of NMDAR subunits (NR1, NR2A, NR2B) and PSD-95 to synaptic lipid rafts and decrease in the post-synaptic density plus an increase of NR2B phosphorylation at tyrosine 1472 in the rat insular cortex. In the hippocampus, spatial training induces selective translocation of NR1 and NR2A subunits to lipid rafts. These results suggest that NMDARs translocate from the soluble fraction of post-synaptic membrane (non-raft PSD) to synaptic lipid raft during spatial memory formation. The recruitment of NMDA receptors and other proteins to lipid rafts could be an important mechanism for increasing the efficiency of synaptic transmission during synaptic plasticity process.
AB - NMDA receptors (NMDARs) activation in the hippocampus and insular cortex is necessary for spatial memory formation. Recent studies suggest that localization of NMDARs to lipid rafts enhance their signalization, since the kinases that phosphorylate its subunits are present in larger proportion in lipid raft membrane microdomains. We sought to determine the possibility that NMDAR translocation to synaptic lipid rafts occurs during plasticity processes such as memory formation. Our results show that water maze training induces a rapid recruitment of NMDAR subunits (NR1, NR2A, NR2B) and PSD-95 to synaptic lipid rafts and decrease in the post-synaptic density plus an increase of NR2B phosphorylation at tyrosine 1472 in the rat insular cortex. In the hippocampus, spatial training induces selective translocation of NR1 and NR2A subunits to lipid rafts. These results suggest that NMDARs translocate from the soluble fraction of post-synaptic membrane (non-raft PSD) to synaptic lipid raft during spatial memory formation. The recruitment of NMDA receptors and other proteins to lipid rafts could be an important mechanism for increasing the efficiency of synaptic transmission during synaptic plasticity process.
KW - Lipid raft
KW - Memory
KW - NMDA receptor
KW - Plasticity
KW - Post-synaptic density
KW - Trafficking
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U2 - 10.1111/j.1471-4159.2008.05523.x
DO - 10.1111/j.1471-4159.2008.05523.x
M3 - Article
C2 - 18700282
AN - SCOPUS:48749127001
SN - 0022-3042
VL - 106
SP - 1658
EP - 1668
JO - Journal of Neurochemistry
JF - Journal of Neurochemistry
IS - 4
ER -