title: Granulocyte colony-stimulating factor mobilized CFU-F can be found in the peripheral blood but have limited expansion potential.
abstract: Bone marrow mesenchymal stem cells are multipotent cells found lining the bone marrow cavity supporting the growth and differentiation of hematologic progenitors. There is growing evidence that these cells can, under the right circumstances, enter the peripheral circulation. We show that granulocyte colony-stimulating factor mobilized peripheral blood contains cells which form colonies and have a similar fibroblastic morphology (termed CFU-F) to bone marrow mesenchymal stem cells. These cells were found at a very low incidence (0.0002%). Mobilized peripheral blood CFU-F were successfully differentiated into osteogenic and adipogenic lineages. FACS analysis showed that the cells had a similar profile to bone marrow mesenchymal stem cells. Importantly, mobilized peripheral blood CFU-F had limited expansion potential and became senescent 20-25 days after isolation. Mobilized peripheral blood CFU-F also did not have any telomerase activity and displayed significant telomere shortening. The rarity of CFU-F in mobilized peripheral blood and the subsequent pressure to divide in cell culture probably contribute to early cellular senescence. Their potential for use in transplant or gene therapy is, therefore, limited.
authors.affiliation: Pediatric Hematology-Oncology and Blood and Marrow Transplant Program, University of Minnesota, Mayo Mail Code 484, D-557 Mayo Building, 420 Delaware St. S.E., Minneapolis, MN 55455, USA. lundx072@umn.edu
authors.forename: Troy C
authors.initials: TC
authors.lastname: Lund
authors.forename: Jakub
authors.initials: J
authors.lastname: Tolar
authors.forename: Paul J
authors.initials: PJ
authors.lastname: Orchard
mesh_terms: D001854:Bone Marrow Cells / Q000166:cytology; D002454:Cell Differentiation; D002469:Cell Separation; D002478:Cells, Cultured / Q000378:metabolism; D016922:Cellular Senescence; D003114:Colony-Forming Units Assay; D004797:Enzyme-Linked Immunosorbent Assay; D005434:Flow Cytometry; D016179:Granulocyte Colony-Stimulating Factor / Q000378:metabolism*; D006412:Hematopoietic Stem Cells / Q000166:cytology; D006801:Humans; D007963:Leukocytes, Mononuclear / Q000166:cytology; D008648:Mesoderm / Q000166:cytology; D013234:Stem Cells / Q000166:cytology; D016615:Telomere / Q000648:ultrastructure
chemical_list: D016179:Granulocyte Colony-Stimulating Factor