Published online 2 July 2001. doi:10.1084/jem.194.1.99
© The Rockefeller University Press, 0022-1007/2001/7/99/ $5.00
The Journal of Experimental Medicine, Volume 194, Number 1, July 2, 2001 99-106
Separation of Notch1 Promoted Lineage Commitment and Expansion/Transformation in Developing T Cells
David Allmana,c,
Fredrick G. Karnella,b,
Jennifer A. Puntd,
Sonia Bakkoura,b,
Lanwei Xua,b,
Peggy Myungc,
Gary A. Koretzkya,c,
John C. Puia,b,
Jon C. Astere, and
Warren S. Peara,b
a Department of Pathology and Laboratory Medicine, University of Pennsylvania Medical Center, Philadelphia, PA 19104
b Institute of Medicine and Engineering, University of Pennsylvania Medical Center, Philadelphia, PA 19104
c Abramson Family Cancer Research Institute, University of Pennsylvania Medical Center, Philadelphia, PA 19104
d Department of Biology, Haverford College, Haverford, PA 19041
e Department of Pathology, Brigham and Women's Hospital, Boston, MA 02115
611 BRB II/III, 421 Curie Blvd., Philadelphia, PA 19104-6160.215-573-8606215-573-7764
wpear{at}mail.med.upenn.edu
Notch1 signaling is required for T cell development. We have previously demonstrated that expression of a dominant active Notch1 (ICN1) transgene in hematopoietic stem cells (HSCs) leads to thymic-independent development of CD4+CD8+ double-positive (DP) T cells in the bone marrow (BM). To understand the function of Notch1 in early stages of T cell development, we assessed the ability of ICN1 to induce extrathymic T lineage commitment in BM progenitors from mice that varied in their capacity to form a functional pre-T cell receptor (TCR). Whereas mice repopulated with ICN1 transduced HSCs from either recombinase deficient (Rag-2–/–) or Src homology 2 domain–containing leukocyte protein of 76 kD (SLP-76)–/– mice failed to develop DP BM cells, recipients of ICN1-transduced Rag-2–/– progenitors contained two novel BM cell populations indicative of pre-DP T cell development. These novel BM populations are characterized by their expression of CD3
and pre-T
mRNA and the surface proteins CD44 and CD25. In contrast, complementation of Rag-2–/– mice with a TCRβ transgene restored ICN1-induced DP development in the BM within 3 wk after BM transfer (BMT). At later time points, this population selectively and consistently gave rise to T cell leukemia. These findings demonstrate that Notch signaling directs T lineage commitment from multipotent progenitor cells; however, both expansion and leukemic transformation of this population are dependent on T cell–specific signals associated with development of DP thymocytes.
Key Words: leukemia development hematopoiesis lymphocyte stem cells
© 2001 The Rockefeller University Press

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