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Related Experiment Videos

Involvement of intracellular Ca(2+) in the regulatory volume decrease after hyposmotic swelling in MDCK cells.

Naoko Iida-Tanaka1, Iyuki Namekata, Megumi Kaneko

  • 1Department of Food Science, Faculty of Home Economics, Otsuma Woman's University, Tokyo, Japan.

Journal of Pharmacological Sciences
|August 11, 2007
PubMed
Summary
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Intracellular calcium (Ca2+) release aids Madin-Darby canine kidney cell volume regulation during hyposmotic stress. This calcium signaling is crucial for the cell

Area of Science:

  • Cell biology
  • Physiology
  • Biochemistry

Background:

  • Cell volume regulation is a fundamental physiological process.
  • Madin-Darby canine kidney (MDCK) cells are a widely used model for studying epithelial transport and cell volume regulation.
  • The role of intracellular calcium (Ca2+) in cell volume changes is not fully understood.

Purpose of the Study:

  • To investigate the source of Ca2+ involved in the volume regulation of MDCK cells.
  • To elucidate the contribution of intracellular Ca2+ stores to the regulatory volume decrease (RVD) following hyposmotic swelling.

Main Methods:

  • Confocal microscopy was employed to visualize Ca2+ dynamics.
  • Fluoroprobes were used to measure cytoplasmic Ca2+ concentrations.
  • Experiments were conducted in Ca2+-free solutions and with thapsigargin pretreatment to assess Ca2+ sources.

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Main Results:

  • Hyposmotic conditions induced a transient increase in MDCK cell volume and cytoplasmic Ca2+.
  • The rise in cytoplasmic Ca2+ peaked at 3-5 minutes and returned to baseline within 30 minutes.
  • Both the late decrease in cell volume and the Ca2+ transient were diminished in Ca2+-free solutions and abolished by thapsigargin, indicating involvement of intracellular Ca2+ stores.

Conclusions:

  • Ca2+ released from intracellular stores plays a significant role in the regulatory volume decrease of MDCK cells.
  • Intracellular Ca2+ signaling is a key component of the cellular response to hyposmotic stress in kidney cells.