Prostaglandin E2 inhibits human T-cell proliferation after crosslinking of the CD3-Ti complex by directly affecting T cells at an early step of the activation process

Cell Immunol. 1987 Jan;104(1):24-36. doi: 10.1016/0008-8749(87)90003-7.


We have studied the effects of prostaglandin E2 (PGE2) on in vitro human T-cell activation induced by crosslinking of the CD3-Ti complex with the monoclonal anti-CD3 antibodies OKT3 and UCHT-1. PGE2 (greater than or equal to 3 X 10(-9) M) when added simultaneously with anti-CD3 to cultures of peripheral blood mononuclear cells (PBMC), significantly suppressed, in a dose-dependent way, T-cell proliferation (P less than 0.002). However, when T cells were first preactivated with OKT3 for 3 days, subsequent proliferation driven by recombinant interleukin 2 (IL-2) was not inhibited by addition of PGE2. This indicates that PGE2 affects the activation step resulting from crosslinking of CD3-Ti, but not the IL-2-driven proliferative phase. Other manifestations of T-cell activation were therefore examined. Both IL-2 production and the expression of receptors for IL-2 (as detected with the anti-Tac monoclonal antibody) were inhibited by PGE2. The addition of purified interleukin 1 (IL-1) or recombinant IL-2 to the cultures did not reverse the inhibiting effect of PGE2 on IL-2-receptor expression. PGE2, added at the time of culture initiation, also inhibited T-cell proliferation in cultures which were supplemented with exogenous IL-1 or IL-2. Proof for a direct effect of PGE2 on T cells was obtained in experiments in which monocyte-depleted T cells were stimulated, in the presence of IL-1, with solid-phase-bound anti-CD3 antibody. Proliferation of T cells in this system is accessory cell independent and still was strongly inhibited by PGE2. Finally, preincubation of PBMC with PGE2 (3 X 10(-6) M) for 48 hr did not result in the generation of suppressor cells for anti-CD3-induced T-cell proliferation or for IL-2 production. Our results demonstrate that PGE2 has a direct inhibitory effect on an early step of T-cell activation, resulting in decreased IL-2 production, decreased IL-2-receptor expression, decreased responsiveness to exogenous IL-2, and decreased proliferation. However, PGE2 does not affect IL-2-driven proliferation of activated T cells. The inhibitory effect on T-cell activation is not mediated through suppressor T cells, nor through inhibition of accessory cell function.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Antigens, Differentiation, T-Lymphocyte
  • Antigens, Surface / immunology*
  • Dinoprostone
  • Female
  • Humans
  • Interleukin-1
  • Interleukin-2 / biosynthesis
  • Lymphocyte Activation / drug effects*
  • Male
  • Middle Aged
  • Prostaglandins E / biosynthesis
  • Prostaglandins E / pharmacology*
  • Receptors, Immunologic / analysis
  • Receptors, Interleukin-2
  • T-Lymphocytes / drug effects*
  • T-Lymphocytes / immunology
  • T-Lymphocytes, Regulatory / drug effects
  • Thymidine / metabolism


  • Antigens, Differentiation, T-Lymphocyte
  • Antigens, Surface
  • Interleukin-1
  • Interleukin-2
  • Prostaglandins E
  • Receptors, Immunologic
  • Receptors, Interleukin-2
  • Dinoprostone
  • Thymidine