The Journal of Immunology, Vol 155, Issue 10 4544-4550, Copyright © 1995 by American Association of Immunologists

ARTICLES

MHC class I-selected CD4-CD8-TCR-alpha beta+ T cells are a potential source of IL-4 during primary immune response

MC Leite-de-Moraes, A Herbelin, F Machavoine, A Vicari, JM Gombert, M Papiernik and M Dy
Rene Descartes University, Paris, France.

Differentiation of naive CD4+ lymphocytes into either Th1 or Th2 cells is influenced by the cytokine present during initial Ag priming. IL-4 is the critical element in the induction of Th2 response; however, its origin during a primary immune response is not well defined. In the present study, we characterized a novel potential source of IL-4, the class I-selected CD4-CD8-TCR-alpha beta+ T cells. In a first set of experiments, we demonstrated that CD4-CD8-TCR-alpha beta+ thymocytes produce a large amount of IL-4 after in vitro anti-CD3 stimulation. This phenomenon was not observed in class I-deficient mice, demonstrating that among these cells, the class I-selected subset was predominantly responsible for IL-4 production. Further studies focused on the in vivo IL-4-producing capacity of peripheral CD4-CD8-TCR-alpha beta+ T cells. To this end, a single injection of anti-CD3 mAb, which promptly induces IL-4 mRNA expression, was used. Peripheral CD4-CD8-TCR- alpha beta+ T cells express high levels of IL-4 mRNA in response to in vivo anti-CD3 challenge. Furthermore, analysis performed in mice lacking MHC class I or class II molecules demonstrates that both the class I-selected subset of CD4-CD8-TCR+ and CD4+ peripheral T lymphocytes are the major IL-4 producers after in vivo anti-CD3 stimulation. These findings suggest that class I-selected CD4-CD8-TCR- alpha beta+ and CD4+ T cell populations are important sources of IL-4 probably implicated in the development of specific Th2 immune responses.

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