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J Exp Med. 2009 Apr 13;206(4):779-91. doi: 10.1084/jem.20081922. Epub 2009 Apr 6.

CSL-MAML-dependent Notch1 signaling controls T lineage-specific IL-7R{alpha} gene expression in early human thymopoiesis and leukemia.

Author information

  • 1Centro de Biología Molecular Severo Ochoa, Consejo Superior de Investigaciones Científicas, Universidad Autónoma de Madrid, Spain.

Erratum in

  • J Exp Med. 2009 Jul 6;206(7):1633.

Abstract

Notch1 activation is essential for T-lineage specification of lymphomyeloid progenitors seeding the thymus. Progression along the T cell lineage further requires cooperative signaling provided by the interleukin 7 receptor (IL-7R), but the molecular mechanisms responsible for the dynamic and lineage-specific regulation of IL-7R during thymopoiesis are unknown. We show that active Notch1 binds to a conserved CSL-binding site in the human IL7R gene promoter and critically regulates IL7R transcription and IL-7R alpha chain (IL-7Ralpha) expression via the CSL-MAML complex. Defective Notch1 signaling selectively impaired IL-7Ralpha expression in T-lineage cells, but not B-lineage cells, and resulted in a compromised expansion of early human developing thymocytes, which was rescued upon ectopic IL-7Ralpha expression. The pathological implications of these findings are demonstrated by the regulation of IL-7Ralpha expression downstream of Notch1 in T cell leukemias. Thus, Notch1 controls early T cell development, in part by regulating the stage- and lineage-specific expression of IL-7Ralpha.

PMID:
19349467
[PubMed - indexed for MEDLINE]
PMCID:
PMC2715119
Free PMC Article
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