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Related Experiment Videos

Control of M-current

N V Marrion1

  • 1Vollum Institute, Oregon Health Sciences University, Portland 97201, USA.

Annual Review of Physiology
|January 1, 1997
PubMed
Summary
This summary is machine-generated.

The M-current, a key potassium channel, significantly controls neuronal excitability. Its modulation by receptors and intracellular calcium impacts neuronal function by altering single-channel gating.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Electrophysiology

Background:

  • The M-current is a crucial non-inactivating potassium current present in numerous neuronal cell types.
  • It plays a dominant role in regulating membrane excitability, particularly during action potential initiation.
  • The M-current's amplitude and gating can be modulated by various receptor types and intracellular signaling pathways.

Purpose of the Study:

  • To review the diverse second messenger pathways regulating M-current activity.
  • To examine receptor-mediated modulation of the M-current.
  • To discuss the influence of intracellular calcium on M-current amplitude and single-channel gating.

Main Methods:

  • Review of existing literature on M-current regulation.

Related Experiment Videos

  • Analysis of studies investigating receptor-mediated modulation.
  • Examination of research on intracellular calcium's role in M-current control.

    • Main Results:

    • Multiple second messenger systems converge on M-current regulation.
    • Receptor activation leads to either suppression or enhancement of M-current.
    • Intracellular calcium levels significantly impact M-current amplitude and single-channel gating properties.

    Conclusions:

    • Modulation of the M-current has profound effects on neuronal excitability.
    • Understanding these regulatory mechanisms is vital for comprehending neuronal function and dysfunction.
    • Both receptor-mediated and calcium-dependent pathways critically influence M-current gating and overall neuronal activity.