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Related Experiment Videos

Calcium-dependent potassium currents in neurons from cat sensorimotor cortex.

P C Schwindt1, W J Spain, W E Crill

  • 1Department of Physiology and Biophysics, University of Washington School of Medicine, Seattle 98195.

Journal of Neurophysiology
|January 1, 1992
PubMed
Summary

Calcium-dependent potassium currents in cat sensorimotor cortex Betz cells were investigated. Two distinct components of this current were identified, differing in their activation and decay kinetics, and sensitivity to apamin and transmitters.

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Area of Science:

  • Neuroscience
  • Electrophysiology
  • Cellular Physiology

Background:

  • Betz cells, large pyramidal neurons in layer V of the cat sensorimotor cortex, play a crucial role in motor control.
  • Understanding the ionic mechanisms underlying neuronal excitability, particularly calcium-dependent potassium currents, is essential for comprehending neural function.

Purpose of the Study:

  • To characterize the properties of calcium-dependent potassium currents in cat sensorimotor cortex Betz cells.
  • To differentiate and pharmacologically isolate the components of these currents.
  • To investigate the influence of different activation patterns (step depolarizations vs. trains of action potentials) on current kinetics.

Main Methods:

  • In vitro brain slice preparation of cat sensorimotor cortex.

Related Experiment Videos

  • Single microelectrode voltage clamp technique.
  • Pharmacological blockade of calcium influx and specific potassium channel modulators (apamin, isoproterenol, muscarine).
  • Use of tetrodotoxin (TTX) to block sodium currents.
  • Intracellular recording with dimethyl-BAPTA to study effects on current kinetics.

    • Main Results:

    • A calcium-dependent outward current was observed during step depolarizations, with both fast and slow components.
    • The current activated at potentials positive to -40 mV and showed a prolonged outward tail current upon repolarization.
    • Pharmacological analysis revealed two separable components: one sensitive to apamin and another sensitive to isoproterenol or muscarine.
    • Activation by a train of action potentials resulted in distinct rapid (apamin-sensitive) and slow (transmitter-sensitive) decaying current components.

    Conclusions:

    • Betz cells possess at least two pharmacologically and kinetically distinct calcium-dependent potassium currents.
    • These currents exhibit differential activation and decay properties depending on the pattern of neuronal activity.
    • The findings contribute to a deeper understanding of the complex ionic conductances regulating the excitability of cortical pyramidal neurons.