i proteins and enhances engraftment of competitive, repopulating stem cells
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Departments of
* Microbiology/Immunology,
Medicine (Hematology/Oncology), and
# Pediatrics (Neonatology),
Walther Oncology Center and
** Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis;
Walther Cancer Institute, Indianapolis, Indiana; and
¶ Laboratory of Immunology and Hematopoiesis, Department of Veterinary Pathology, Purdue University, West Lafayette, Indiana
Correspondence: Hal E. Broxmeyer, Ph.D., Walther Oncology Center, Indiana University School of Medicine, 1044 West Walnut Street, R4-302, Indianapolis, IN 46202. E-mail: hbroxmey{at}iupui.edu
Stromal cell-derived factor-1 (SDF-1/CXCL12) enhances survival of myeloid progenitor cells. The two main questions addressed by us were whether these effects on the progenitors were direct-acting and if SDF-1/CXCL12 enhanced engrafting capability of competitive, repopulating mouse stem cells subjected to short-term ex vivo culture with other growth factors. SDF-1/CXCL12 had survival-enhancing/antiapoptosis effects on human bone marrow (BM) and cord blood (CB) and mouse BM colony-forming units (CFU)-granulocyte macrophage, burst-forming units-erythroid, and CFU-granulocyte-erythroid-macrophage-megakaryocyte with similar dose responses. The survival effects were direct-acting, as assessed on colony formation by single isolated human BM and CB CD34+++ cells. Effects were mediated through CXCR4 and G
i proteins. Moreover, SDF-1/CXCL12 greatly enhanced the engrafting capability of mouse long-term, marrow-competitive, repopulating stem cells cultured ex vivo with interleukin-6 and steel factor for 48 h. These results extend information on the survival effects mediated through the SDF-1/CXCL12–CXCR4 axis and may be of relevance for ex vivo expansion and gene-transduction procedures.
Key Words: hematopoietic progenitor and stem cells • chemokines • cytokines • apoptosis
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