CaMKII regulates the frequency-response function of hippocampal synapses for the production of both LTD and LTP

Cell. 1995 Jun 16;81(6):891-904. doi: 10.1016/0092-8674(95)90009-8.


To investigate the function of the autophosphorylated form of CaMKII in synaptic plasticity, we generated transgenic mice that express a kinase that is Ca2+ independent as a result of a point mutation of Thr-286 to aspartate, which mimics autophosphorylation. Mice expressing the mutant form of the kinase show an increased level of Ca(2+)-independent CaMKII activity similar to that seen following LTP. The mice nevertheless exhibit normal LTP in response to stimulation at 100 Hz. However, at lower frequencies, in the range of 1-10 Hz, there is a systematic shift in the size and direction of the resulting synaptic change in the transgenic animals that favors LTD. The regulation of this frequency-response function by Ca(2+)-independent CaMKII activity seems to account for two previously unexplained synaptic phenomena, the relative loss of LTD in adult animals compared with juveniles and the enhanced capability for depression of facilitated synapses.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Animals
  • Base Sequence
  • Behavior, Animal / physiology
  • Calcium-Calmodulin-Dependent Protein Kinases / genetics
  • Calcium-Calmodulin-Dependent Protein Kinases / physiology*
  • DNA, Complementary / genetics
  • Electric Stimulation
  • Female
  • Gene Expression
  • Hippocampus / pathology
  • Hippocampus / physiology*
  • In Situ Hybridization
  • Long-Term Potentiation / genetics
  • Long-Term Potentiation / physiology*
  • Male
  • Mice
  • Mice, Inbred C57BL
  • Mice, Transgenic
  • Models, Neurological
  • Molecular Sequence Data
  • Neuronal Plasticity / genetics
  • Neuronal Plasticity / physiology*
  • Point Mutation
  • Synapses / physiology


  • DNA, Complementary
  • Calcium-Calmodulin-Dependent Protein Kinases