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Involvement of cAMP in CD3 T cell receptor complex- and CD2-mediated apoptosis of human thymocytes

F Mentz1, M D Mossalayi, F Ouaaz

  • 1Groupe d'Immuno-Hématologie Moléculaire, CNRS URA625, CHU Pitié-Salpêtrière, Paris, France.

European Journal of Immunology
|June 1, 1995
PubMed

Insights

Cyclic adenosine monophosphate (cAMP) acts as a crucial second messenger in human thymocyte apoptosis. Manipulating cAMP levels affects programmed cell death, impacting T cell development and self-tolerance.

Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • Programmed cell death (apoptosis) is vital for eliminating autoreactive T cells during intrathymic T cell development, ensuring self-tolerance.
  • The specific intracellular signaling molecules (second messengers) that regulate thymocyte apoptosis are not fully understood.

Purpose of the Study:

  • To investigate the role of cyclic adenosine monophosphate (cAMP) as a second messenger in human thymocyte apoptosis.
  • To determine how modulation of cAMP levels affects spontaneous and activation-induced apoptosis in human thymocytes.

Main Methods:

  • Treatment of human thymocytes with cAMP pathway modulators: Rp-cAMP (antagonist) and dibutyryl-cAMP (analog).
  • Assessment of spontaneous and activation-induced apoptosis following stimulation of CD3/T cell receptor or CD2 antigens.
  • Evaluation of thymocyte growth and rescue from programmed cell death in the presence of interleukins (IL-2, IL-4).

Main Results:

  • Rp-cAMP significantly reduced spontaneous apoptosis of human thymocytes in vitro.
  • Rp-cAMP rescued thymocytes from activation-induced apoptosis.
  • Dibutyryl-cAMP increased programmed cell death in a dose-dependent manner and inhibited IL-2/IL-4-mediated rescue.

Conclusions:

  • Cyclic adenosine monophosphate (cAMP) is involved as a second messenger in the apoptosis of normal human thymocytes.
  • Modulation of intracellular cAMP levels can regulate thymocyte survival and programmed cell death, influencing T cell development.

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