title: Human osteoblasts support hematopoietic cell development in vitro.
abstract: OBJECTIVE
  Although osteoblasts are thought to be the major component of the hematopoietic stem cell niche in the bone marrow microenvironment, the role of osteoblasts in hematopoiesis is still unclear. The ability of human osteoblasts to support early hematopoiesis was investigated.
  
  
  RESULTS
  Human CD34+ bone marrow cells cultured on human osteoblasts were capable of surviving without addition of cytokines and differentiated into myeloid cells with slight proliferation. The results of immunohistochemical experiments suggested activation of FAK and AKT in hematopoietic cells attached to osteoblasts. When stem cell factor, Flt3-L, and IL-3 were added to the coculture system, each cytokine distinctively enhanced proliferation and differentiation of CD34+ bone marrow cells.
  
  
  CONCLUSIONS
  The results suggest that human osteoblasts have the ability to support hematopoietic cell development in vitro.
authors.affiliation: Department of Developmental Biology, National Research Institute for Child Health and Development, Tokyo, Japan.
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Shiozawa
authors.forename: Hisami
authors.initials: H
authors.lastname: Takenouchi
authors.forename: Tomoko
authors.initials: T
authors.lastname: Taguchi
authors.forename: Masahiro
authors.initials: M
authors.lastname: Saito
authors.forename: Yohko U
authors.initials: YU
authors.lastname: Katagiri
authors.forename: Hajime
authors.initials: H
authors.lastname: Okita
authors.forename: Toshiaki
authors.initials: T
authors.lastname: Shimizu
authors.forename: Yuichiro
authors.initials: Y
authors.lastname: Yamashiro
authors.forename: Junichiro
authors.initials: J
authors.lastname: Fujimoto
authors.forename: Nobutaka
authors.initials: N
authors.lastname: Kiyokawa
mesh_terms: D018952:Antigens, CD34; D002454:Cell Differentiation / Q000187:drug effects / Q000502:physiology*; D049109:Cell Proliferation / Q000187:drug effects; D002478:Cells, Cultured; D018920:Coculture Techniques; D006410:Hematopoiesis / Q000187:drug effects / Q000502:physiology*; D006412:Hematopoietic Stem Cells / Q000166:cytology / Q000502:physiology*; D006801:Humans; D007377:Interleukin-3 / Q000494:pharmacology; D008565:Membrane Proteins / Q000494:pharmacology; D022423:Myeloid Cells / Q000166:cytology / Q000502:physiology; D010006:Osteoblasts / Q000166:cytology / Q000502:physiology*; D019089:Stem Cell Factor / Q000494:pharmacology
chemical_list: D018952:Antigens, CD34; C508596:IL3 protein, human; D007377:Interleukin-3; D008565:Membrane Proteins; D019089:Stem Cell Factor; C084881:flt3 ligand protein