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Immunity. 2002 Dec;17(6):749-56.

Induction of T cell development from hematopoietic progenitor cells by delta-like-1 in vitro.

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  • 1Department of Immunology, University of Toronto, Sunnybrook and Women's College Health Sciences Centre, Toronto, Ontario, Canada.


The molecular interactions provided by the thymic microenvironment that predicate T cell development remain obscure. Here, we show that a bone marrow stromal cell line ectopically expressing the Notch ligand Delta-like-1 loses its ability to support B cell lymphopoiesis, but acquires the capacity to induce the differentiation of hematopoietic progenitors into CD4 CD8 double- and single-positive T cells. Both gammadelta-TCR(+) and alphabeta-TCR(+) T cells are generated, and CD8(+) TCR(hi) cells produce gamma-interferon following CD3/TCR stimulation. These results establish that expression of Delta-like-1 on stromal cells provides key signals for the induction of T cell lineage commitment, stage-specific progenitor expansion, TCR gene rearrangement, and T cell differentiation in the absence of a thymus. Thus, it is likely that Delta-like-1/Notch interactions by the thymus underpin its unique ability to promote lineage commitment and differentiation of T cells.

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