title: Ex vivo expansions and transplantations of mouse bone marrow-derived hematopoietic stem/progenitor cells.
abstract: To examine the effects of co-culture with bone marrow mesenchymal stem cells on expansion of hematopoietic stem/progenitor cells and the capacities of rapid neutrophil engraftment and hematopoietic reconstitution of the expanded cells, we expanded mononuclear cells (MNCs) and CD34+/c-kit+ cells from mouse bone marrow and transplanted the expanded cells into the irradiated mice. MNCs were isolated from mouse bone marrow and CD34+/c-kit+ cells were selected from MNCs by using MoFlo Cell Sorter. MNCs and CD34+/c-kit+ cells were co-cultured with mouse bone marrow-derived mesenchymal stem cells (MSCs) under a two-step expansion. The expanded cells were then transplanted into sublethally irradiated BDF1 mice. Results showed that the co-culture with MSCs resulted in expansions of median total nucleated cells, CD34+ cells, GM-CFC and HPP-CFC respectively by 10.8-, 4.8-, 65.9- and 38.8-fold for the mononuclear cell culture, and respectively by 76.1-, 2.9-, 71.7- and 51.8-fold for the CD34+/c-kit+ cell culture. The expanded cells could rapidly engraft in the sublethally irradiated mice and reconstitute their hematopoiesis. Co-cultures with MSCs in conjunction with two-step expansion increased expansions of total nucleated cells, GM-CFC and HPP-CFC, which led us to conclude MSCs may create favorable environment for expansions of hematopoietic stem/progenitor cells. The availability of increased numbers of expanded cells by the co-culture with MSCs may result in more rapid engraftment of neutrophils following infusion to transplant recipients.
authors.affiliation: College of Life Sciences, Zhejiang University, Hangzhou 310012, China. wjflu@mail.hz.zj.cn
authors.forename: Jin-fu
authors.initials: JF
authors.lastname: Wang
authors.forename: Yi-fan
authors.initials: YF
authors.lastname: Wu
authors.forename: Jenny
authors.initials: J
authors.lastname: Harrintong
authors.forename: Ian K
authors.initials: IK
authors.lastname: McNiece
mesh_terms: D000818:Animals; D018920:Coculture Techniques / Q000379:methods*; D018380:Hematopoietic Stem Cell Transplantation / Q000379:methods*; D006412:Hematopoietic Stem Cells; D007953:Leukemia, Radiation-Induced / Q000601:surgery*; D007963:Leukocytes, Mononuclear / Q000637:transplantation*; D045164:Mesenchymal Stem Cell Transplantation / Q000379:methods*; D059630:Mesenchymal Stem Cells; D051379:Mice; D016019:Survival Analysis; D016896:Treatment Outcome