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Activity-dependent slow hyperpolarization in cat sensorimotor cortex in vitro.

H Kitagawa1, Y Nishimura, Y Kumazawa

  • 1National Institute for Physiological Sciences, Okazaki, Japan.

Brain Research
|June 24, 2000
PubMed
Summary
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Synaptic activity influences neuron resting potential. Tetanic stimulation induced slow hyperpolarization and enhanced afterhyperpolarization, dependent on NMDA receptors and calcium influx.

Area of Science:

  • Neuroscience
  • Cellular Electrophysiology

Background:

  • Resting membrane potential is crucial for neuronal function.
  • Synaptic mechanisms regulating resting potential are not fully understood.

Purpose of the Study:

  • To investigate the synaptic regulation of resting membrane potential in cat sensorimotor cortex pyramidal neurons.
  • To elucidate the role of NMDA receptors and calcium channels in this process.

Main Methods:

  • Intracellular recording in slice preparation of cat sensorimotor cortex.
  • Tetanic stimulation of white matter to induce synaptic activity.
  • Application of NMDA receptor antagonist and calcium channel blocker (Ni2+).

Main Results:

  • Tetanic stimulation induced subthreshold depolarization followed by slow hyperpolarization.

Related Experiment Videos

  • Afterhyperpolarization following action potentials was enhanced.
  • Slow hyperpolarization and enhanced afterhyperpolarization were blocked by NMDA antagonist and Ni2+, or by strong hyperpolarization (-80 mV).

    • Conclusions:

    • Synaptic mechanisms involving NMDA receptors and calcium influx regulate resting membrane potential.
    • These mechanisms contribute to slow hyperpolarization and enhanced afterhyperpolarization in pyramidal neurons.