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From the * Center for Blood Research, Inc., and the Hematopoietic progenitor cells migrate in vitro and in vivo towards a gradient of the chemotactic factor stromal cell-derived factor-1 (SDF-1) produced by stromal cells. This is the first chemoattractant reported for human CD34+ progenitor cells. Concentrations of SDF-1 that elicit
chemotaxis also induce a transient elevation of cytoplasmic calcium in CD34+ cells. SDF-1-induced
chemotaxis is inhibited by pertussis toxin, suggesting that its signaling in CD34+ cells is mediated by seven transmembrane receptors coupled to Gi proteins. CD34+ cells migrating to SDF-1
include cells with a more primitive (CD34+/CD38
Department of Genetics, § Department of
Pathology, and
Department of Medicine, Harvard Medical School, Boston, Massachusetts 02115; ¶ Blood Component Laboratory, Dana-Farber Cancer Institute, Boston, Massachusetts 02115; and ** Millennium Pharmaceuticals, Inc., Cambridge, Massachusetts 02139
or CD34+/DR
) phenotype as well as
CD34+ cells phenotypically committed to the erythroid, lymphoid and myeloid lineages, including functional BFU-E, CFU-GM, and CFU-MIX progenitors. Chemotaxis of CD34+
cells in response to SDF-1 is increased by IL-3 in vitro and is lower in CD34+ progenitors
from peripheral blood than in CD34+ progenitors from bone marrow, suggesting that an altered response to SDF-1 may be associated with CD34 progenitor mobilization.
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