title: CD34high+ CD38(low/-) cells generated in a xenogenic coculture system are capable of both long-term hematopoiesis and multiple differentiation.
abstract: CD34+ cells isolated from human umbilical cord blood (HUCB) are thought to have potential in clinical applications such as transplantation and gene therapy. Recently, we developed a xenogenic coculture system involving HUCB-CD34+ cells and murine bone marrow stromal cells, HESS-5 cells, in combination with human interleukin-3 and stem cell factor. Under these xenogenic coculture conditions, the numbers of CD34high+ cells and primitive progenitor cells, such as CD34high+ CD38(low/-) cells and high proliferative potential colony-forming cells (HPP-CFCs), increased dramatically by a factor of 102.1, 66.5 and 104.9, respectively. In the present study, we used a secondary culture of B progenitor cells and long-term culture (LTC)-initiating cells to characterize and compare the progenitor capability of re-isolated CD34high+ CD38(low/-) cells, which have been identified as one of the most primitive progenitor cells, with that of freshly isolated CD34high+ CD38(low/-) cells. Compared with freshly isolated CD34high+ CD38(low/-) cells, the re-isolated CD34high+ CD38(low/-) cells were equally as capable of proliferating and differentiating into myeloid and B progenitor cells. No significant differences were observed in the frequency of LTC-initiating cells in the re-isolated CD34high+ CD38(low/-) cells compared with that in freshly isolated CD34high+ CD38(low/-) cells. Furthermore, the re-isolated CD34high+ CD38(low/-) cells were capable of long-term reconstitution and multiple differentiation in non-obese diabetic mice with severe combined immunodeficiency disease (NOD/SCID mice). The results demonstrate that this xenogenic coculture system can be used for successful in vitro expansion of HUCB-progenitor cells that possess the capability for both long-term hematopoiesis as well as multipotent differentiation into myeloid and lymphoid cells both in vivo and in vitro.
authors.affiliation: Division of Hematology, Pharmaceutical Frontier Research Laboratories, JT Inc., Kanagawa, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Tsuji
authors.forename: K
authors.initials: K
authors.lastname: Itoh
authors.forename: Y
authors.initials: Y
authors.lastname: Nishimura-Morita
authors.forename: Y
authors.initials: Y
authors.lastname: Watanabe
authors.forename: D
authors.initials: D
authors.lastname: Hirano
authors.forename: K J
authors.initials: KJ
authors.lastname: Mori
authors.forename: K
authors.initials: K
authors.lastname: Yatsunami
mesh_terms: D036541:ADP-ribosyl Cyclase; D051997:ADP-ribosyl Cyclase 1; D000818:Animals; D015703:Antigens, CD; D018952:Antigens, CD34 / Q000097:blood*; D000943:Antigens, Differentiation / Q000097:blood*; D002454:Cell Differentiation / Q000502:physiology; D002460:Cell Line; D018920:Coculture Techniques; D003922:Diabetes Mellitus, Type 1 / Q000503:physiopathology; D005312:Fetal Blood / Q000276:immunology*; D006410:Hematopoiesis / Q000276:immunology*; D006801:Humans; D016130:Immunophenotyping; D008562:Membrane Glycoproteins; D051379:Mice; D016688:Mice, Inbred NOD; D016513:Mice, SCID; D009244:NAD+ Nucleosidase / Q000097:blood*; D016511:Severe Combined Immunodeficiency; D013997:Time Factors; D014183:Transplantation, Heterologous
chemical_list: D015703:Antigens, CD; D018952:Antigens, CD34; D000943:Antigens, Differentiation; D008562:Membrane Glycoproteins; D036541:ADP-ribosyl Cyclase; C498154:CD38 protein, human; C498155:Cd38 protein, mouse; D009244:NAD+ Nucleosidase; D051997:ADP-ribosyl Cyclase 1