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J. Exp. Med.
© The Rockefeller University Press
0022-1007/97/05/1541/08 $2.00
Volume 185, Number 9, May 5, 1997 1541-1548

Role of Different T Cell Receptors in the Development of Pre-T Cells

By Jan Buer,* Iannis Aifantis,* James P. DiSanto,Dagger Hans Joerg Fehling,§ and Harald von Boehmer*

From the * Institut Necker, Institut National de la Santé et de la Recherche Médicale, 373, F-75730 Paris, Cedex 15, France; Dagger  Hôpital Necker-Enfants Malades, Institut National de la Santé et de la Recherche Médicale, 429, F-75743 Paris, France; and § Basel Institute for Immunology, CH-4005 Basel, Switzerland

The development of pre-T cells with productive TCR-beta rearrangements can be mediated by each the pre-T cell receptor (pre-TCR), the TCR-alpha beta as well as the TCR-gamma delta , albeit by distinct mechanisms. Although the TCR-gamma delta affects CD4-8- precursor cells irrespective of their rearrangement status by TCR-beta mechanisms not involving TCR-beta selection, both the preTCR and the TCR-alpha beta select only cells with productive TCR-beta genes for expansion and maturation. The TCR-alpha beta appears to be much less effective than the pre-TCR because of the paucity of TCR-alpha proteins in TCR-beta -positive precursors since an early expressed transgenic TCR-alpha beta can largely substitute for the pre-TCR. Thus, the TCR-alpha beta can assume a role not only in the rescue from programmed cell death of CD4+8+ but also of CD4-8- thymocytes. In evolution this double function of the TCR-alpha beta may have been responsible for the maturation of alpha beta T cells before the advent of the pre-TCR-alpha chain.


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