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Generation of Induced Regulatory T Cells from Primary Human Naïve and Memory T Cells
14:23

Generation of Induced Regulatory T Cells from Primary Human Naïve and Memory T Cells

Published on: April 16, 2012

CD47 ligation selectively inhibits the development of human naive T cells into Th1 effectors

M N Avice1, M Rubio, M Sergerie

  • 1Allergy Research Laboratory, Research Center of CHUM, Notre-Dame Hospital, University of Montreal, and Department of Obstetrics and Gynecology, University of Montreal, Quebec, Canada.

Journal of Immunology (Baltimore, Md. : 1950)
|October 18, 2000
PubMed

Insights

CD47 ligation inhibits IL-12-driven Th1 cell development by reducing IL-2 production and IL-12 receptor expression. Restoring IL-2 levels corrects these effects, highlighting IL-2

Area of Science:

  • Immunology
  • Cell Biology

Background:

  • CD47 (integrin-associated protein) regulates IL-12 production by monocytes and dendritic cells.
  • Th1 cell development is crucial for adaptive immunity and is driven by IL-12.

Purpose of the Study:

  • To investigate the role of CD47 ligation in IL-12-driven Th1 cell development.
  • To elucidate the mechanisms by which CD47 influences Th1 differentiation.

Main Methods:

  • Primary cultures of cord blood mononuclear cells were used.
  • CD47 ligation was achieved using CD47 mAb, F(ab')(2) fragments, or the 4N1K peptide.
  • Cytokine secretion, IFN-gamma production, IL-2 production, and IL-12Rbeta2 chain expression were analyzed.

Main Results:

  • CD47 ligation inhibited IL-12-driven Th1 cell development, evidenced by reduced IFN-gamma production.
  • CD47 engagement decreased IL-12-induced IL-2 production and IL-12Rbeta2 chain expression.
  • Exogenous IL-2 supplementation corrected IL-12Rbeta2 expression and restored Th1 cell development.
  • CD47 engagement did not alter Th1/Th2 phenotype or affect IL-4-induced Th2 development.

Conclusions:

  • CD47 ligation inhibits Th1 cell development, partly through downregulation of IL-2 and IL-12Rbeta2.
  • IL-2 plays a critical role in Th1 cell development.
  • Simultaneous targeting of IL-2 and IL-12 may offer therapeutic benefits for Th1 autoimmune diseases.

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