The Journal of Experimental Medicine
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Published online 17 July 2006 doi:10.1084/jem.20060731
Rockefeller University Press, 0022-1007 $8.00
JEM, Volume 203, Number 8, 1977-1984
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ARTICLE

 Phenotypic plasticity of T cell progenitors upon exposure to Notch ligands

Andreas Krueger, Annette I. Garbe, and Harald von Boehmer

Harvard Medical School, Dana-Farber Cancer Institute, Boston, MA 02115

CORRESPONDENCE Andreas Krueger: Andreas_Krueger{at}dfci.harvard.edu

Despite many efforts, the nature of thymic immigrants that give rise to T cells has remained obscure, especially since it became known that extrathymic lineage-negative, Sca-1–positive, c-kit high progenitor cells differ from intrathymic early T cell progenitors (ETPs) by functional potential and dependence on Notch signaling. After our observation that intrathymic T cell precursors expressing a human CD25 reporter under control of pre-TCR{alpha} regulatory elements almost exclusively have the ETP phenotype, we have analyzed the phenotypic changes of reporter-expressing common lymphoid progenitor (CLP) cells in the bone marrow when cultured on Delta-like 1–expressing stromal cells. We note that these quickly adopt the phenotype of double negative (DN)2 thymocytes with little display of the ETP phenotype. Our data suggest that common lymphoid progenitor (CLP) cells could be responsible for the rapid reconstitution of thymus function after bone marrow transplantation since CLP cells in the blood have the capacity to rapidly enter the thymus and become DN2 thymocytes.

Abbreviations used: CCR9, CC chemokine receptor 9; CLP, common lymphoid progenitor; DN, double negative; ETP, early T cell progenitor; Flt3, Fms-like tyrosine kinase receptor 3; Flt3L, Flt3 ligand; HSA, heat stable antigen; LSK, lineage negative, Sca-1–positive, c-kit high cells; LSKF, LSK cells expressing Flt3; SCF, stem cell factor.


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