Impaired NMDA receptor-mediated postsynaptic function and blunted NMDA receptor-dependent persistent pain in mice lacking postsynaptic density-93 protein.
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Modification of synaptic NMDA receptor (NMDAR) expression influences NMDAR-mediated synaptic function and associated persistent pain. NMDARs directly bind to a family of membrane-associated guanylate kinases (MAGUKs) that regulate surface and synaptic NMDAR trafficking in the CNS. We report here that postsynaptic density-93 protein (PSD-93), a postsynaptic neuronal MAGUK, is expressed abundantly in spinal dorsal horn and forebrain, where it colocalizes and interacts with NMDAR subunits NR2A and NR2B. Targeted disruption of the PSD-93 gene reduces not only surface NR2A and NR2B expression but also NMDAR-mediated excitatory postsynaptic currents and potentials, without affecting surface AMPA receptor expression or its synaptic function, in the regions mentioned above. Furthermore, mice lacking PSD-93 exhibit blunted NMDAR-dependent persistent pain induced by peripheral nerve injury or injection of Complete Freund's Adjuvant, although they display intact nociceptive responsiveness to acute pain. PSD-93 appears to be important for NMDAR synaptic targeting and function and to be a potential biochemical target for the treatment of persistent pain.
author list (cited authors)
Tao, Y., Rumbaugh, G., Wang, G., Petralia, R. S., Zhao, C., Kauer, F. W., ... Johns, R. A.
complete list of authors
Tao, Yuan-Xiang||Rumbaugh, Gavin||Wang, Guo-Du||Petralia, Ronald S||Zhao, Chengshui||Kauer, Frederick W||Tao, Feng||Zhuo, Min||Wenthold, Robert J||Raja, Srinivasa N||Huganir, Richard L||Bredt, David S||Johns, Roger A