CaMKII versus DAPK1 Binding to GluN2B in Ischemic Neuronal Cell Death after Resuscitation from Cardiac Arrest.
DAPK1 binding to GluN2B was prominently reported to mediate ischemic cell death in vivo. DAPK1 and CaMKII bind to the same GluN2B region, and their binding is mutually exclusive. Here, we show that mutating the binding region on GluN2B (L1298A/R1300Q) protected against neuronal cell death induced by cardiac arrest followed by ... resuscitation. Importantly, the GluN2B mutation selectively abolished only CaMKII, but not DAPK1, binding. During ischemic or excitotoxic insults, CaMKII further accumulated at excitatory synapses, and this accumulation was mediated by GluN2B binding. Interestingly, extra-synaptic GluN2B decreased after ischemia, but its relative association with DAPK1 increased. Thus, ischemic neuronal death requires CaMKII binding to synaptic GluN2B, whereas any potential role for DAPK1 binding is restricted to a different, likely extra-synaptic population of GluN2B.
Mesh Terms:
Animals, Calcium-Calmodulin-Dependent Protein Kinase Type 2, Cell Death, Death-Associated Protein Kinases, Dendritic Spines, Female, Glutamic Acid, HEK293 Cells, Heart Arrest, Humans, Ischemia, Male, Mice, Mice, Inbred C57BL, Mutation, Neuroprotection, Neuroprotective Agents, Neurotoxins, Protein Binding, Rats, Sprague-Dawley, Receptors, N-Methyl-D-Aspartate, Resuscitation
Animals, Calcium-Calmodulin-Dependent Protein Kinase Type 2, Cell Death, Death-Associated Protein Kinases, Dendritic Spines, Female, Glutamic Acid, HEK293 Cells, Heart Arrest, Humans, Ischemia, Male, Mice, Mice, Inbred C57BL, Mutation, Neuroprotection, Neuroprotective Agents, Neurotoxins, Protein Binding, Rats, Sprague-Dawley, Receptors, N-Methyl-D-Aspartate, Resuscitation
Cell Rep
Date: Jan. 07, 2020
PubMed ID: 31914378
View in: Pubmed Google Scholar
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