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Related Experiment Videos

K+ conductance activated during regulatory volume decrease. The channels in Ehrlich cells and their possible

M I Niemeyer1, L P Cid, F V Sepúlveda

  • 1Centro de Estudios Científicos (CECS), Valdivia, Chile. miniemeyer@cecs.cl

Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
|March 27, 2002
PubMed
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Hypotonic cell swelling activates potassium (K+) currents in Ehrlich ascites tumor cells. These volume-sensitive K+ channels, potentially TASK-2, are inhibited by clofilium and may play a role in cell volume regulation.

Area of Science:

  • Cell Physiology
  • Ion Transport
  • Membrane Biophysics

Background:

  • Cell volume regulation is crucial for cellular function.
  • Hypotonic stress triggers ion fluxes to restore cell volume.
  • Potassium (K+) currents are implicated in regulatory volume decrease (RVD).

Purpose of the Study:

  • To investigate the characteristics of K+ currents activated by hypotonic cell swelling in Ehrlich ascites tumor cells.
  • To identify the specific K+ channels involved in this volume-sensitive current.
  • To explore the role of signaling molecules in regulating these currents.

Main Methods:

  • Whole-cell patch-clamp technique at 37°C.
  • Experiments conducted with buffered intracellular Ca2+ to isolate K+ currents.

Related Experiment Videos

  • Cation selectivity, current-voltage relationships, and drug inhibition studies.

    • Main Results:

    • Volume-sensitive K+ currents were observed, independent of intracellular Ca2+.
    • The selectivity sequence for cations was K+ > Rb+ > NH4+ > Na+ ≈ Li+ ≈ Cs+.
    • The drug clofilium blocked the current and inhibited RVD; leukotriene D4 (LTD4) activated the current.

    Conclusions:

    • Swelling-activated K+ channels in Ehrlich cells exhibit properties of background K+ channels.
    • The TASK-2 channel, a member of the 2P-4TM family, is a potential candidate for mediating these currents.
    • These findings contribute to understanding the molecular mechanisms of cell volume regulation.