PMID: 8996248Jan 6, 1997Paper

Replacement of pre-T cell receptor signaling functions by the CD4 coreceptor

The Journal of Experimental Medicine
A M NormentR M Perlmutter

Abstract

An important checkpoint in early thymocyte development ensures that only thymocytes with an in-frame T cell receptor for antigen beta (TCR-beta) gene rearrangement will continue to mature. Proper assembly of the TCR-beta chain into the pre-TCR complex delivers signals through the src-family protein tyrosine kinase p56lck that stimulate thymocyte proliferation and differentiation to the CD4+CD8+ stage. However, the biochemical mechanisms governing p56lck activation remain poorly understood. In more mature thymocytes, p56lck is associated with the cytoplasmic domain of the TCR coreceptors CD4 and CD8, and cross-linking of CD4 leads to p56lck activation. To study the effect of synchronously inducing p56lck activation in immature CD4-CD8- thymocytes, we generated mice expressing a CD4 transgene in Rag2-/- thymocytes. Remarkably, without further experimental manipulation, the CD4 transgene drives maturation of Rag2-/- thymocytes in vivo. We show that this process is dependent upon the ability of the CD4 transgene to bind Lck and on the expression of MHC class II molecules. Together these results indicate that binding of MHC class II molecules to CD4 can deliver a biologically relevant, Lck-dependent activation signal to thymocytes i...Continue Reading

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Citations

Aug 1, 1997·Current Opinion in Immunology·A M Cheng, A C Chan
Jun 17, 1998·Scandinavian Journal of Immunology·M K Schneider, K O Grönvik
Nov 7, 2001·Scandinavian Journal of Immunology·F E PetterssonK O Grönvik
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May 8, 2003·The Journal of Immunology : Official Journal of the American Association of Immunologists·Valérie DutoitDanila Valmori

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