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*
Immunobiology Working Group, Division of Basic Sciences, Fox Chase Cancer Center, Philadelphia, PA 19111;
Division of Immunology, The Netherlands Cancer Institute, Amersterdam, The Netherlands; and
Rosetta Inpharmatics, Kirkland, WA 98034
Progression of immature CD4-CD8-
thymocytes beyond the
-selection checkpoint to the
CD4+CD8+ stage requires activation of the
pre-TCR complex; however, few of the DNA-binding proteins that serve as
molecular effectors of those pre-TCR signals have been identified. We
demonstrate in this study that members of the early growth response
(Egr) family of transcription factors are critical effectors of the
signals that promote this developmental transition. Specifically, the
induction of three Egr family members (Egr1, 2, and 3) correlates with
pre-TCR activation and development of
CD4-CD8- thymocytes beyond the
-selection
checkpoint. Enforced expression of each of these Egr factors is able to
bypass the block in thymocyte development associated with defective
pre-TCR function. However, Egr family members may play somewhat
distinct roles in promoting thymocyte development, because there are
differences in the genes modulated by enforced expression of particular
Egr factors. Finally, interfering with Egr function using
dominant-negative proteins disrupts thymocyte development from the
CD4-CD8- to the
CD4+CD8+ stage. Taken together, these data
demonstrate that the Egr proteins play an essential role in executing
the differentiation program initiated by pre-TCR
signaling.
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