title: Chemokine SDF-1 enhances circulating CD34(+) cell proliferation in synergy with cytokines: possible role in progenitor survival.
abstract: The chemokine stromal cell-derived factor-1 (SDF-1), and its receptor, CXCR-4, have been implicated in the homing and mobilization of human CD34(+) cells. We show here that SDF-1 may also be involved in hematopoiesis, promoting the proliferation of human CD34(+) cells purified from normal adult peripheral blood (PB). CXCR-4 was expressed on PB CD34(+) cells. The amount of CXCR-4 on PB CD34(+) cells was 10 times higher when CD34(+) cells were purified following overnight incubation. CXCR-4 overexpression was correlated with a primitive PB CD34(+) cell subset defined by a CD34(high) CD38(low)CD71(low)c-Kit(low)Thy-1(+) antigenic profile. The functional significance of CXCR-4 expression was ascertained by assessing the promoting effect of SDF-1alpha on cell cycle, proliferation, and colony formation. SDF-1 alone increased the percentage of CD34(+) cells in the S+G(2)/M phases and sustained their survival. In synergy with cytokines, SDF-1 increased PB CD34(+) and CD34(high)CD38(low) cell expansion and colony formation. SDF-1 also stimulated the growth of colonies derived from primitive progenitors released from quiescence by anti-TGF-beta treatment. Thus, our results shed new light on the potential role of this chemokine in the stem cell engraftment process, which involves migration, adhesion, and proliferation. Furthermore, both adhesion-induced CXCR-4 overexpression and SDF-1 stimulating activity may be of clinical relevance for improving cell therapy settings in stem cell transplantation.
authors.affiliation: Laboratoire d'Immunologie Cellulaire, Centre de Transfusion Sanguine des Armées Jean Julliard, Clamart Cedex, France.
authors.forename: J J
authors.initials: JJ
authors.lastname: Lataillade
authors.forename: D
authors.initials: D
authors.lastname: Clay
authors.forename: C
authors.initials: C
authors.lastname: Dupuy
authors.forename: S
authors.initials: S
authors.lastname: Rigal
authors.forename: C
authors.initials: C
authors.lastname: Jasmin
authors.forename: P
authors.initials: P
authors.lastname: Bourin
authors.forename: M C
authors.initials: MC
authors.lastname: Le Bousse-Kerdilès
mesh_terms: D000328:Adult; D000911:Antibodies, Monoclonal / Q000494:pharmacology; D018952:Antigens, CD34 / Q000032:analysis; D002453:Cell Cycle / Q000187:drug effects; D002455:Cell Division / Q000187:drug effects; D002470:Cell Survival; D054377:Chemokine CXCL12; D019743:Chemokines, CXC / Q000494:pharmacology*; D003114:Colony-Forming Units Assay; D004357:Drug Synergism; D015672:Erythroid Precursor Cells / Q000166:cytology / Q000187:drug effects; D016178:Granulocyte-Macrophage Colony-Stimulating Factor / Q000494:pharmacology; D016298:Hematopoietic Cell Growth Factors / Q000494:pharmacology*; D006412:Hematopoietic Stem Cells / Q000145:classification / Q000166:cytology / Q000187:drug effects*; D006801:Humans; D007377:Interleukin-3 / Q000494:pharmacology; D008533:Megakaryocytes / Q000166:cytology / Q000187:drug effects; D010766:Phosphorylation / Q000187:drug effects; D011499:Protein Processing, Post-Translational / Q000187:drug effects; D011505:Protein-Tyrosine Kinases / Q000378:metabolism; D019718:Receptors, CXCR4 / Q000187:drug effects; D019089:Stem Cell Factor / Q000494:pharmacology; D016212:Transforming Growth Factor beta / Q000037:antagonists & inhibitors / Q000276:immunology
chemical_list: D000911:Antibodies, Monoclonal; D018952:Antigens, CD34; C515255:CXCL12 protein, human; D054377:Chemokine CXCL12; D019743:Chemokines, CXC; D016298:Hematopoietic Cell Growth Factors; D007377:Interleukin-3; D019718:Receptors, CXCR4; D019089:Stem Cell Factor; D016212:Transforming Growth Factor beta; D016178:Granulocyte-Macrophage Colony-Stimulating Factor; D011505:Protein-Tyrosine Kinases