PGE2 suppresses mitogen-induced Ca2+ mobilization in T cells

Am J Physiol. 1999 Dec;277(6):R1741-8. doi: 10.1152/ajpregu.1999.277.6.R1741.


PGE2-mediated suppression of T cell proliferation during sepsis could result from altered Ca2+ signaling. The present study evaluated the effects of PGE2 on Ca2+ release from intracellular stores and its influx through the plasma membrane in splenic T cells from Sprague-Dawley rats. Intracellular Ca2+ concentration ([Ca2+]i) responses in individual T cells were assessed using the Ca2+ imaging technique, and the release of Ca2+ from intracellular stores and Ca2+ influx were spectrofluorometrically quantified in T cell suspensions. Under unstimulated conditions, nearly 85% of T cells exhibited [Ca2+]i </=50 nM. After stimulation with concanavalin A (Con A), an increase in [Ca2+]i was recorded in approximately 60% of the cells. The pretreatment of T cells with PGE2 had no apparent effect on [Ca2+]i in resting cells; it significantly suppressed the Con A-induced increase in [Ca2+]i in all of the Con A-responsive cells. Ca2+ release from the intracellular stores contributed to the early spike in [Ca2+]i, and the late phase of elevation in [Ca2+]i was dependent on Ca2+ influx through the plasma membrane. Our data suggest that PGE(2) causes an overall suppression of the Con A-induced [Ca2+]i elevation in T cells via inhibiting both Ca2+ influx and its release from the intracellular stores.

Publication types

  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Animals
  • Calcium / metabolism*
  • Cell Membrane / metabolism
  • Cells, Cultured
  • Concanavalin A / pharmacology
  • Dinoprostone / pharmacology*
  • Egtazic Acid / pharmacology
  • Kinetics
  • Lymphocyte Activation / physiology
  • Male
  • Rats
  • Rats, Sprague-Dawley
  • Spleen / immunology
  • T-Lymphocytes / drug effects
  • T-Lymphocytes / immunology
  • T-Lymphocytes / physiology*


  • Concanavalin A
  • Egtazic Acid
  • Dinoprostone
  • Calcium