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Related Experiment Videos

Fatty acid-sensitive two-pore domain K+ channels.

Donghee Kim1

  • 1Department of Physiology and Biophysics, Finch University of Health Sciences/The Chicago Medical School, 3333 Green Bay Road, North Chicago, IL 60064, USA. Donghee.kim@finchcms.edu

Trends in Pharmacological Sciences
|December 5, 2003
PubMed
Summary

Free fatty acid-activated potassium channels (K(FA) channels) sense cellular stress. These channels, part of the TREK-TRAAK family, respond to various stimuli including fatty acids, stretch, pH changes, and anesthetics.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Physiology

Background:

  • Potassium channels (K(+)) are crucial for cellular function.
  • Free fatty acid-activated potassium channels (K(FA) channels) are present in the central nervous system (CNS) and peripheral tissues.
  • K(FA) channels belong to the TREK-TRAAK subfamily of tandem-pore domain K(2P) channels.

Purpose of the Study:

  • To elucidate the function and activation mechanisms of K(FA) channels.
  • To understand how K(FA) channels respond to various physiological and chemical stimuli.
  • To explore the role of K(FA) channels in cellular stress sensing.

Main Methods:

  • Electrophysiological recordings to measure K(FA) channel activity.
  • Application of free fatty acids, mechanical stretch, and pH changes to cells expressing K(FA) channels.

Related Experiment Videos

  • Investigation of signaling pathways, including cAMP-mediated phosphorylation, affecting K(FA) channel function.

    • Main Results:

    • K(FA) channels are activated by free fatty acids, membrane stretch, intracellular pH changes, and volatile anesthetics.
    • Neurotransmitter activation of G(s)-protein-coupled receptors inhibits K(FA) current through cAMP-dependent phosphorylation.
    • K(FA) channels exhibit unique properties making them suitable for detecting cellular stress.

    Conclusions:

    • K(FA) channels are versatile sensors of diverse cellular stresses.
    • The TREK-TRAAK family of K(2P) channels plays a significant role in cellular homeostasis.
    • Understanding K(FA) channel regulation provides insights into cellular responses to various stimuli.