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Blood, 1 February 2008, Vol. 111, No. 3, pp. 1735-1738.
Prepublished online as a Blood First Edition Paper on November 5, 2007; DOI 10.1182/blood-2007-02-076000.
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TRANSPLANTATION
Brief Report
Clinical stem-cell sources contain CD8+CD3+ T-cell receptor–negative cells that facilitate bone marrow repopulation with hematopoietic stem cells
Stephanie Bridenbaugh1,
Linda Kenins1,
Emilie Bouliong-Pillai1,
Christian P. Kalberer1,
Elena Shklovskaya1,
Alois Gratwohl2, and
Aleksandra Wodnar-Filipowicz1
1 Experimental Hematology, Department of Research, and
2 Clinical Hematology, University Hospital Basel, Basel, Switzerland
Clinical observations in patients undergoing bone marrow transplantation implicate the involvement of CD8+ cells in promoting the stem-cell engraftment process. These findings are supported by mouse transplant studies, which attributed the engraftment-facilitating function to subpopulations of murine CD8+ cells, but the analogous cells in humans have not been identified. Here, we report that clinical stem-cell grafts contain a population of CD8 +CD3 + T-cell receptor– negative cells with an engraftment facilitating function, named candidate facilitating cells (cFCs). Purified cFC augmented human hematopoiesis in NOD/SCID mice receiving suboptimal doses of human CD34+ cells. In vitro, cFCs cocultured with CD34+ cells increased hematopoietic colony formation, suggesting a direct effect on clonogenic precursors. These results provide evidence for the existence of rare human CD8+CD3+TCR– cells with engraftment facilitating properties, the adoptive transfer of which could improve the therapeutic outcome of stem-cell transplantation.

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