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Chain Controls Survival
of
/
T Cells
By


From the * Centre d'Immunologie Institut National de la Santé et de la Recherche Médicale-Centre
National de la Recherche Scientifique de Marseille Luminy, Case 906, 13288 Marseille Cedex 9, France; We have investigated the role of common
Unité d'Immunologie, Centre National de la Recherche Scientifique Unité Recherche Associée
1961, Institut Pasteur, 75724 Paris, France; § Center for Cancer Research, Massachusetts Institute of
Technology, 02139 Cambridge, Massachusetts; and
INSERM U429, Hôpital Necker-Enfants
Malades, 75743 Paris, France
chain (
c)-signaling pathways for the development
of T cell receptor for antigen (TCR)-
/
T cells. TCR-
/
-bearing cells were absent from
the adult thymus, spleen, and skin of
c-deficient (
c
) mice, whereas small numbers of thymocytes expressing low levels of TCR-
/
were detected during fetal life. Recent reports
have suggested that signaling via interleukin (IL)-7 plays a major role in facilitating TCR-
/
development through induction of V-J (variable-joining) rearrangements at the TCR-
locus.
In contrast, we detected clearly TCR-
rearrangements in fetal thymi from
c
mice (which
fail to signal in response to IL-7) and reduced TCR-
rearrangements in adult
c thymi. No
gross defects in TCR-
or TCR-
rearrangements were observed in
c
mice of any age. Introduction of productively rearranged TCR V
1 or TCR V
1/V
6 transgenes onto mice
bearing the
c mutation did not restore TCR-
/
development to normal levels suggesting that
c-dependent pathways provide additional signals to developing
/
T cells other than for
the recombination process. Bcl-2 levels in transgenic thymocytes from
c
mice were dramatically reduced compared to
c+ transgenic littermates. We favor the concept that
c-dependent receptors are required for the maintenance of TCR-
/
cells and contribute to the completion
of TCR-
rearrangements primarily by promoting survival of cells committed to the TCR-
/
lineage.
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