title: Mobilization of early hematopoietic progenitor cells with BB-10010: a genetically engineered variant of human macrophage inflammatory protein-1 alpha.
abstract: BB-10010 is a genetically engineered variant of human macrophage inflammatory protein-1 alpha with improved solution properties. We show here that it mobilizes stem cells into the peripheral blood. We investigated the mobilizing effects of BB-10010 on the numbers of circulating 8-day spleen colony-forming units (CFU-S8), CFU-S12, and progenitors with marrow repopulating ability (MRA). A single subcutaneous dose of BB-10010 caused a twofold increase in circulating numbers of CFU-S8, CFU-S12, and MRA 30 minutes after dosing. We also investigated the effects of granulocyte colony-stimulating factor (G-CSF) and the combination of G-CSF with BB-10010 on progenitor mobilization. Two days of G-CSF treatment increased circulating CFU-S8, CFU-S12, and MRA progenitors by 25.7-, 19.8-, and 27.7-fold. A single administration of BB-10010 after 2 days of G-CSF treatment increased circulating CFU-S8, CFU-S12, and MRA even further to 38-, 33-, and 100-fold. Splenectomy resulted in increased circulating progenitor numbers but did not change the pattern of mobilization. Two days of treatment with G-CSF then increased circulating CFU-S8, CFU-S12, and MRA by 64-, 69-, and 32-fold. A single BB-10010 administration after G-CSF treatment further increased them to 85-, 117-, and 140-fold, respectively, compared with control. We conclude that BB-10010 causes a rapid increase in the number of circulating hematopoietic progenitors and further enhances the numbers induced by pretreatment with G-CSF. BB-10010 preferentially mobilized the more primitive progenitors with marrow repopulating activity, releasing four times the number achieved with G-CSF alone. Translated into a clinical setting, this improvement in progenitor cell mobilization may enhance the efficiency of harvest and the quality of grafts for peripheral blood stem cell transplantation.
authors.affiliation: CRC Department of Experimental Haematology, Paterson Institute for Cancer Research, Christie Hospital NHS Trust, Withington, Manchester, UK.
authors.forename: B I
authors.initials: BI
authors.lastname: Lord
authors.forename: L B
authors.initials: LB
authors.lastname: Woolford
authors.forename: L M
authors.initials: LM
authors.lastname: Wood
authors.forename: L G
authors.initials: LG
authors.lastname: Czaplewski
authors.forename: M
authors.initials: M
authors.lastname: McCourt
authors.forename: M G
authors.initials: MG
authors.lastname: Hunter
authors.forename: R M
authors.initials: RM
authors.lastname: Edwards
mesh_terms: D000818:Animals; D002452:Cell Count / Q000187:drug effects; D054405:Chemokine CCL3; D054407:Chemokine CCL4; D003114:Colony-Forming Units Assay; D016207:Cytokines / Q000235:genetics / Q000378:metabolism*; D016179:Granulocyte Colony-Stimulating Factor / Q000494:pharmacology; D006412:Hematopoietic Stem Cells / Q000187:drug effects*; D006801:Humans; D019402:Macrophage Inflammatory Proteins; D051379:Mice; D015846:Monokines / Q000235:genetics / Q000378:metabolism*; D011994:Recombinant Proteins / Q000235:genetics / Q000378:metabolism / Q000494:pharmacology
chemical_list: D054405:Chemokine CCL3; D054407:Chemokine CCL4; D016207:Cytokines; D019402:Macrophage Inflammatory Proteins; D015846:Monokines; D011994:Recombinant Proteins; D016179:Granulocyte Colony-Stimulating Factor