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Long-term depression is induced in Ca2+/calmodulin kinase-inhibited visual cortex neurons

M Funauchi1, T Tsumoto, A Nishigori

  • 1Department of Neurophysiology, Biomedical Research Center, Osaka University Medical School, Japan.

Neuroreport
|February 1, 1992
PubMed

Insights

Calcium-Calmodulin-dependent protein kinase II (CaMKII) inhibition in rat visual cortex neurons induced long-term depression (LTD) instead of long-term potentiation (LTP). This suggests postsynaptic CaMKII is crucial for LTP/LTD induction.

Area of Science:

  • Neuroscience
  • Cellular Neuroscience
  • Synaptic Plasticity

Background:

  • Long-term potentiation (LTP) and long-term depression (LTD) are key mechanisms for synaptic plasticity in the brain.
  • Calcium-Calmodulin-dependent protein kinase II (CaMKII) is implicated in learning and memory processes.

Purpose of the Study:

  • To investigate the specific role of CaMKII in the induction of LTP in the visual cortex.
  • To determine if CaMKII activity is essential for establishing input-specific synaptic plasticity.

Main Methods:

  • Inhibition of CaMKII using KN-62 in layer 2/3 neurons of young rat visual cortex slices.
  • Tetanic stimulation applied to induce plasticity.
  • Measurement of excitatory postsynaptic potentials (EPSPs) to assess synaptic strength changes.

Main Results:

  • CaMKII inhibition resulted in long-term depression (LTD) instead of LTP following tetanic stimulation in 9 out of 14 cells.
  • The induced LTD was input-specific, affecting only the stimulated pathway.
  • Neurons with intact CaMKII function exhibited LTP under similar stimulation conditions.

Conclusions:

  • Postsynaptic CaMKII activity is critical for the induction of long-term potentiation (LTP) in the visual cortex.
  • CaMKII plays a differential role in mediating LTP and LTD, highlighting its complex involvement in synaptic plasticity.

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