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Maxi K+ channel mediates regulatory volume decrease response in a human bronchial epithelial cell line.

José M Fernández-Fernández1, Muriel Nobles, Aoife Currid

  • 1Unitat de Senyalització Cellular, Departament de Ciències Experimentals i de la Salut, Universitat Pompeu Fabra, 08003 Barcelona, Spain.

American Journal of Physiology. Cell Physiology
|October 22, 2002
PubMed
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The human bronchial epithelial cell regulatory volume decrease (RVD) response involves maxi K+ channels. Swelling-activated TRPV4 channels may mediate calcium influx, activating these maxi K+ channels during hypotonic stress.

Area of Science:

  • Cell Biology
  • Physiology
  • Ion Channel Function

Background:

  • Cell volume regulation is crucial for cellular function.
  • The regulatory volume decrease (RVD) response is primarily mediated by chloride and potassium channels.
  • Maxi K+ channels are implicated in the RVD of human bronchial epithelial cells.

Purpose of the Study:

  • To identify the specific potassium channels involved in the RVD response of human bronchial epithelial (HBE) cells.
  • To elucidate the molecular mechanisms underlying K+ channel activation during hypotonic stress.

Main Methods:

  • Patch-clamp electrophysiology (single-channel and whole-cell recordings) to measure K+ currents.
  • Reverse transcription-polymerase chain reaction (RT-PCR) and Western blot to detect channel expression.

Related Experiment Videos

  • Pharmacological characterization using channel inhibitors and activators.

    • Main Results:

    • Maxi K+ channels were identified in HBE cells and activated by hypotonic solutions.
    • Both RVD and maxi K+ current activation were calcium-dependent.
    • TRPV4 (transient receptor potential vanilloid 4) channels were detected in HBE cells and are implicated in sensing volume changes and mediating calcium influx.

    Conclusions:

    • Maxi K+ channels are key players in the RVD of HBE cells.
    • TRPV4 channels likely initiate the RVD process by sensing hypotonicity and facilitating calcium entry, which subsequently activates maxi K+ channels.