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Blood, 1 April 2005, Vol. 105, No. 7, pp. 2717-2723.
Prepublished online as a Blood First Edition Paper on November 30, 2004; DOI 10.1182/blood-2004-06-2159.


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HEMATOPOIESIS

Identification of LinSca1+kit+CD34+Flt3 short-term hematopoietic stem cells capable of rapidly reconstituting and rescuing myeloablated transplant recipients

Liping Yang, David Bryder, Jörgen Adolfsson, Jens Nygren, Robert Månsson, Mikael Sigvardsson, and Sten Eirik W. Jacobsen

From the Hematopoietic Stem Cell Laboratory, Lund Strategic Research Center for Stem Cell Biology and Cell Therapy, Lund University, Lund, Sweden.

In clinical bone marrow transplantation, the severe cytopenias induced by bone marrow ablation translate into high risks of developing fatal infections and bleedings, until transplanted hematopoietic stem and progenitor cells have replaced sufficient myeloerythroid offspring. Although adult long-term hematopoietic stem cells (LT-HSCs) are absolutely required and at the single-cell level sufficient for sustained reconstitution of all blood cell lineages, they have been suggested to be less efficient at rapidly reconstituting the hematopoietic system and rescuing myeloablated recipients. Such a function has been proposed to rather be mediated by less well-defined short-term hematopoietic stem cells (ST-HSCs). Herein, we demonstrate that LinSca1+kithiCD34+ short-term reconstituting cells contain 2 phenotypically and functionally distinct subpopulations: LinSca1+kithiCD34+flt3 cells fulfilling all criteria of ST-HSCs, capable of rapidly reconstituting myelopoiesis, rescuing myeloablated mice, and generating LinSca1+kithiCD34+flt3+ cells, responsible primarily for rapid lymphoid reconstitution. Representing the first commitment steps from LinSca1+kithi CD34flt3 LT-HSCs, their identification will greatly facilitate delineation of regulatory pathways controlling HSC fate decisions and identification of human ST-HSCs responsible for rapid reconstitution following HSC transplantations.


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