title: Mesenchymal stem cells from bone marrow show a stronger stimulating effect on megakaryocyte progenitor expansion than those from non-hematopoietic tissues.
abstract: In order to evaluate whether mesenchymal stem cells (MSCs) from non-hematopoietic tissues are able to regulate megakaryocytopoiesis, we identified human MSCs from adult bone marrow (ABM), fetal pancreas (FPan) and umbilical cord (UC), and their abilities to support megakaryocyte (MK) differentiation from CD34(+) hematopoietic progenitor cells (HPCs) were comparatively studied. First, MSCs were isolated from ABM, FPan and UC then their growth kinetics, molecular characterization and mesodermal differentiation capacity were determined. ABM-MSCs, FPan-MSCs and UC-MSCs were irradiated and cocultured with human umbilical cord blood (UCB) CD34(+) cells, and the expansion efficiency of MK progenitor cells and MK formation were analysed and compared. Finally, SCF, IL-6 and GM-CSF expression by the three types of MSCs were also examined. Our results showed that FPan-MSCs and UC-MSCs shared most of the characteristic of ABM-MSCs, including morphology, immunophenotype, adipogenic and osteogenic differentiation potentials. Compared with ABM-MSCs, fetal MSCs had higher proliferative capacity. After 7 days' coculture, the maximal production of CD34(+)/CD41a(+) cells was obtained in a group of CD34(+) HPCs + ABM-MSCs. Furthermore, this group produced more MK colonies than other groups (p < 0.05). Surface antigen and ploidy analysis morphological observation demonstrated that a proportion of expanded cells in each group differentiated into mature MKs. ABM-MSCs, FPan-MSCs and UC-MSCs were revealed to express SCF, IL-6 and GM-CSF at mRNA level. We conclude that FPan-MSCs and UC-MSCs have the ability to promote megakaryocytopoiesis, while ABM-MSCs expand more MK progenitor cells from CD34(+) HPCs than MSCs from non-hematopoietic tissues and CD34(+) cells alone.
authors.affiliation: State Key Laboratory of Experimental Hematology, Institute of Hematology, Chinese Academy of Medical Sciences & Peking Union Medical College; National Engineering Research Center of Cell Products, Tianjin, PR China.
authors.forename: Meng
authors.initials: M
authors.lastname: Liu
authors.forename: Shao Guang
authors.initials: SG
authors.lastname: Yang
authors.forename: Lin
authors.initials: L
authors.lastname: Shi
authors.forename: Wei Ting
authors.initials: WT
authors.lastname: Du
authors.forename: Peng Xia
authors.initials: PX
authors.lastname: Liu
authors.forename: Jie
authors.initials: J
authors.lastname: Xu
authors.forename: Dong Sheng
authors.initials: DS
authors.lastname: Gu
authors.forename: Lu
authors.initials: L
authors.lastname: Liang
authors.forename: Chun Lan
authors.initials: CL
authors.lastname: Dong
authors.forename: Zhong Chao
authors.initials: ZC
authors.lastname: Han
mesh_terms: D000328:Adult; D001854:Bone Marrow Cells / Q000166:cytology*; D002454:Cell Differentiation; D005333:Fetus / Q000166:cytology*; D005434:Flow Cytometry; D006801:Humans; D055016:Megakaryocyte Progenitor Cells / Q000166:cytology*; D059630:Mesenchymal Stem Cells / Q000166:cytology*; D010179:Pancreas / Q000166:cytology* / Q000196:embryology; D012016:Reference Values; D014470:Umbilical Cord / Q000166:cytology*