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Related Experiment Videos

Contribution of KCNQ1 to the regulatory volume decrease in the human mammary epithelial cell line MCF-7.

Brenna L vanTol1, Sergey Missan, Julie Crack

  • 1Dept. of Physiology and Biophysics, Dalhousie Univ., Halifax, Nova Scotia B3H 1X5, Canada. elizabeth.cowley@dal.ca).

American Journal of Physiology. Cell Physiology
|June 29, 2007
PubMed
Summary
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The KCNQ1 potassium channel is crucial for regulating cell volume in human mammary epithelial cells (MCF-7) during hyposmotic stress, facilitating regulatory volume decrease.

Area of Science:

  • Cell Biology
  • Physiology
  • Ion Channel Function

Background:

  • Cell volume regulation is essential for cellular homeostasis.
  • Mammary epithelial cells have specific ion transport needs.
  • The role of KCNQ1 channels in mammary cell volume control was unclear.

Purpose of the Study:

  • To investigate the role of KCNQ1 channels in hyposmotic stress response in MCF-7 cells.
  • To determine the localization and function of KCNQ1 in mammary epithelial cell volume regulation.

Main Methods:

  • MCF-7 cells were subjected to hyposmotic stress.
  • Pharmacological inhibitors (Ba(2+), quinine, TEA, chromonol 293B, XE991) were used to block K(+) channels.
  • Dominant-negative KCNQ1 isoforms were employed.

Related Experiment Videos

  • KCNQ1 expression was confirmed via mRNA and protein analysis.
  • Immunofluorescence localized KCNQ1 in polarized monolayers.
  • Whole-cell patch-clamp electrophysiology was performed.

    • Main Results:

    • MCF-7 cells exhibited regulatory volume decrease (RVD) under hyposmotic conditions.
    • K(+) channel inhibitors significantly blocked the RVD response.
    • Specific KCNQ1 inhibitors and dominant-negative isoforms abolished RVD.
    • KCNQ1 mRNA and protein are expressed in MCF-7 cells.
    • KCNQ1 localizes to the apical membrane in polarized MCF-7 monolayers.
    • A hyposmotic-induced, 293B-sensitive K(+) current was detected in MCF-7 cells.
    • Heterologous expression confirmed KCNQ1/KCNE3 forms a volume-sensitive K(+) current.

    Conclusions:

    • KCNQ1 channels are critical for regulating cell volume in MCF-7 cells during hyposmotic stress.
    • KCNQ1 plays a significant role in the RVD mechanism of mammary epithelial cells.
    • KCNQ1 may mediate transepithelial potassium secretion in the mammary epithelium.