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TRPM4 regulates calcium oscillations after T cell activation

Pierre Launay1, Henrique Cheng, Subhashini Srivatsan

  • 1Department of Pathology, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA 02215, USA.

Science (New York, N.Y.)
|November 20, 2004
PubMed

Insights

Inhibiting TRPM4 channels in T cells alters calcium signaling, transforming oscillatory patterns into sustained elevations. This modulation boosts interleukin-2 production, highlighting TRPM4

Area of Science:

  • Immunology
  • Cellular Physiology
  • Ion Channel Function

Background:

  • TRPM4 is a calcium-activated nonselective cation channel.
  • Its role in calcium signaling and cellular responses remains unclear.
  • TRPM4 mediates membrane depolarization.

Purpose of the Study:

  • To investigate the functional importance of TRPM4 in T cell calcium (Ca2+) signaling.
  • To determine the effect of TRPM4 inhibition on receptor-mediated Ca2+ mobilization and cytokine production.

Main Methods:

  • Molecular inhibition of endogenous TRPM4 in T lymphocytes.
  • Measurement of TRPM4 currents.
  • Analysis of intracellular Ca2+ concentration ([Ca2+]i) oscillations.
  • Assessment of interleukin-2 production.

Main Results:

  • TRPM4 inhibition suppressed TRPM4 currents in T cells.
  • Receptor-mediated Ca2+ mobilization was profoundly influenced.
  • Agonist-mediated [Ca2+]i oscillations shifted to a sustained elevation.
  • Interleukin-2 production was enhanced.

Conclusions:

  • TRPM4-mediated depolarization modulates Ca2+ oscillations in T cells.
  • Altered Ca2+ influx due to TRPM4 activity impacts downstream cytokine production.
  • TRPM4 plays a significant role in T cell activation and immune response.

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