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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Targeted disruption of PSD-93 gene reduces platelet-activating factor-induced neurotoxicity in cultured cortical neurons.

PSD-93, a molecular adaptive protein, binds to and clusters the N-methyl-D-aspartate (NMDA) receptor and assembles a specific set of signaling proteins (for example neuronal nitric oxide synthase, nNOS) around the NMDA receptor at synapses in the central nervous system. This suggests that PSD-93 might mediate many NMDA receptor-dependent physiological and pathophysiological functions. We report here that PSD-93 colocalizes and interacts with the NMDA receptor and neuronal nitric oxide synthase in cultured cortical neurons. Targeted disruption of PSD-93 gene significantly prevented NMDA receptor-nitric oxide signaling-dependent neurotoxicity triggered via platelet-activating factor (PAF) receptor activation. In addition, the deficiency of PSD-93 markedly attenuated platelet- activating factor- induced increase in cyclic guanosine 3',5'-monophosphate (cGMP) and prevented platelet- activating factor- promoted formation of NMDA receptor-neuronal nitric oxide synthase complex. These findings indicate that PSD-93 is involved in the NMDA receptor--nitric oxide-mediated pathological processing of neuronal damage triggered via platelet--activating factor receptor activation. Since platelet-activating factor is a potent neuronal injury mediator during the development of brain trauma, seizures, and ischemia, the present work suggests that PSD-93 might contribute to molecular mechanisms of neuronal damage in these brain disorders.[1]


  1. Targeted disruption of PSD-93 gene reduces platelet-activating factor-induced neurotoxicity in cultured cortical neurons. Xu, Y., Zhang, B., Hua, Z., Johns, R.A., Bredt, D.S., Tao, Y.X. Exp. Neurol. (2004) [Pubmed]
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