title: Stromal cell CD9 and the differentiation of hematopoietic stem/progenitor cells.
abstract: CD9 belongs to the tetraspan family of proteins that facilitates the regulation of cell proliferation, motility, and adhesion. In mouse hematopoietic organs, CD9 is expressed by myeloid and stromal cells. Although the precise mechanisms are not clear, antibody ligation of CD9 on stromal cells regulates the adhesion between stromal cells and hematopoietic stem cells, the production of myeloid cells in long term bone marrow cultures and the differentiation of hematopoietic stem cells. A 100 kD protein co-precipitated with CD9 is distinct from several previously reported CD9-associated molecules with respect to size and distribution. Identification and analysis of this interesting protein may clarify the molecular mechanisms through which CD9 bearing stromal cells control the differentiation of hematopoietic stem cells and/or allow them to maintain their vital self-renewal capacity.
authors.affiliation: Department of Internal Medicine and Molecular Science, Graduate School of Medicine, Osaka University, Suita City, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Oritani
authors.forename: K
authors.initials: K
authors.lastname: Aoyama
authors.forename: Y
authors.initials: Y
authors.lastname: Tomiyama
authors.forename: P W
authors.initials: PW
authors.lastname: Kincade
authors.forename: Y
authors.initials: Y
authors.lastname: Matsuzawa
mesh_terms: D000818:Animals; D015703:Antigens, CD / Q000502:physiology*; D002450:Cell Communication / Q000502:physiology*; D002454:Cell Differentiation / Q000502:physiology; D006412:Hematopoietic Stem Cells / Q000166:cytology* / Q000502:physiology; D006801:Humans; D008562:Membrane Glycoproteins; D051379:Mice; D017154:Stromal Cells / Q000166:cytology* / Q000502:physiology; D060245:Tetraspanin 29
chemical_list: D015703:Antigens, CD; C554869:CD9 protein, human; C554870:Cd9 protein, mouse; D008562:Membrane Glycoproteins; D060245:Tetraspanin 29