Journal
ANNUAL REVIEW OF IMMUNOLOGY
Volume 25, Issue -, Pages 649-679Publisher
ANNUAL REVIEWS
DOI: 10.1146/annurev.immunol.23.021704.115715
Keywords
thymus; T cell development; stromal cells; Notch ligands; IL-7; chemokines
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All hematopoietic cells, including T lymphocytes, originate from stem cells that reside in the bone marrow. Most hernatopoietic lineages also mature in the bone marrow, but in this respect, T lymphocytes differ. Under normal circumstances, most T lymphocytes are produced in the thymus from marrow-derived progenitors that circulate in the blood. Cells that home to the thymus from the marrow possess the potential to generate multiple T and non-T lineages. However, there is little evidence to suggest that, once inside the thymus, they give rise to anything other than T cells. Thus, signals unique to the thymic microenvironment compel multipotent progenitors to commit to the T lineage, at the expense of other potential lineages. Summarizing what is known about the signals the thymus delivers to uncommitted progenitors, or to immature T-committed progenitors, to produce functional T cells is the focus of this reviews
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