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J. Exp. Med., Volume 189, Number 3, February 1, 1999 563-574

The Common Cytokine Receptor gamma  Chain and the Pre-T Cell Receptor Provide Independent but Critically Overlapping Signals in Early alpha /beta T Cell Development

By James P. Di Santo,* Iannis Aifantis,§ Eleftheria Rosmaraki,* Corinne Garcia,§ Jacqueline Feinberg,§ Hans Jörg Fehling,parallel Alain Fischer,* Harald von Boehmer,§ and Benedita RochaDagger

From the * Institut National de la Santé et de la Recherche Médicale (INSERM) U429, Hôpital Necker-Enfants Malades, F-75743 Paris, France; Dagger  INSERM U345 and § U373, CHU Necker, F-75730 Paris, France; and the parallel  Basel Institute for Immunology, CH-4005 Basel, Switzerland

Intracellular signals emanating from cytokine and antigen receptors are integrated during the process of intrathymic development. Still, the relative contributions of cytokine receptor signaling to pre-T cell receptor (TCR) and TCR-mediated differentiation remain undefined. Interleukin (IL)-7 interactions with its cognate receptor complex (IL-7Ralpha coupled to the common cytokine receptor gamma  chain, gamma c) play a dominant role in early thymopoiesis. However, alpha /beta T cell development in IL-7-, IL-7Ralpha -, and gamma c-deficient mice is only partially compromised, suggesting that additional pathways can rescue alpha /beta T lineage cells in these mice. We have investigated the potential interdependence of gamma c- and pre-TCR-dependent pathways during intrathymic alpha /beta T cell differentiation. We demonstrate that gamma c-dependent cytokines do not appear to be required for normal pre-TCR function, and that the rate-limiting step in alpha /beta T cell development in gamma c- mice does not involve TCR-beta chain rearrangements, but rather results from poor maintenance of early thymocytes. Moreover, mice double mutant for both gamma c and pre-Talpha show vastly reduced thymic cellularity and a complete arrest of thymocyte differentiation at the CD44+CD25+ cell stage. These observations demonstrate that the pre-TCR provides the gamma c-independent signal which allows alpha /beta T cell development in gamma c- mice. Thus, a series of overlapping signals derived from cytokine and T cell receptors guide the process of alpha /beta thymocyte development.

Key words: thymus;  interleukin;  lymphocyte;  development;  knockout


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