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Cyclin-dependent kinase 5 governs learning and synaptic plasticity via control of NMDAR degradation.

Learning is accompanied by modulation of postsynaptic signal transduction pathways in neurons. Although the neuronal protein kinase cyclin-dependent kinase 5 (Cdk5) has been implicated in cognitive disorders, its role in learning has been obscured by the perinatal lethality of constitutive knockout mice. Here we report that conditional knockout of Cdk5 in the adult mouse brain improved performance in spatial learning tasks and enhanced hippocampal long-term potentiation and NMDA receptor (NMDAR)-mediated excitatory postsynaptic currents. Enhanced synaptic plasticity in Cdk5 knockout mice was attributed to reduced NR2B degradation, which caused elevations in total, surface and synaptic NR2B subunit levels and current through NR2B-containing NMDARs. Cdk5 facilitated the degradation of NR2B by directly interacting with both it and its protease, calpain. These findings reveal a previously unknown mechanism by which Cdk5 facilitates calpain-mediated proteolysis of NR2B and may control synaptic plasticity and learning.

Pubmed ID: 17529984


  • Hawasli AH
  • Benavides DR
  • Nguyen C
  • Kansy JW
  • Hayashi K
  • Chambon P
  • Greengard P
  • Powell CM
  • Cooper DC
  • Bibb JA


Nature neuroscience

Publication Data

July 27, 2007

Associated Grants

  • Agency: NIDA NIH HHS, Id: K01 DA017750
  • Agency: NIMH NIH HHS, Id: K08 MH065975
  • Agency: NIMH NIH HHS, Id: K08 MH065975-04
  • Agency: NIMH NIH HHS, Id: K08 MH065975-05

Mesh Terms

  • Animals
  • Blotting, Western
  • Brain Chemistry
  • Cyclin-Dependent Kinase 5
  • Excitatory Postsynaptic Potentials
  • Hippocampus
  • Immunoprecipitation
  • Learning
  • Male
  • Mice
  • Mice, Knockout
  • Neuronal Plasticity
  • Receptors, N-Methyl-D-Aspartate
  • Reverse Transcriptase Polymerase Chain Reaction
  • Synapses