title: CD61 enriches long-term repopulating hematopoietic stem cells.
abstract: Among the subsets that define hematopoietic stem cells (HSCs), CD34- c-kit+ Sca-1+ lineage marker- (CD34-KSL) cells are regarded as one of the populations that have the highest enrichment of HSCs in adult mouse bone marrow. Here, we demonstrate that long-term repopulating hematopoietic stem cells (LTR-HSCs) have high expression of CD61 (integrin beta3) within the CD34-KSL population. Approximately 60% of CD34-KSL cells showed high expression of CD61. CD61HighCD34-KSL populations also exhibited significantly greater properties of HSC, such as expression of HSC markers, the side population (SP) phenotype, and ability for long-term repopulation. In both SP cells and non-SP (NSP) cells, CD61HighCD34-KSL cells also contained significantly more LTR-HSCs than CD61Low/-CD34-KSL cells. Our results indicate that CD61 is exploitable for HSC enrichment as a supportive positive cell surface marker.
authors.affiliation: Institute of Advanced Biomedical Engineering and Science, Tokyo Women's Medical University, 8-1 Kawada-cho, Shinjuku-ku, Tokyo 162-8666, Japan.
authors.forename: Terumasa
authors.initials: T
authors.lastname: Umemoto
authors.forename: Masayuki
authors.initials: M
authors.lastname: Yamato
authors.forename: Yoshiko
authors.initials: Y
authors.lastname: Shiratsuchi
authors.forename: Masao
authors.initials: M
authors.lastname: Terasawa
authors.forename: Joseph
authors.initials: J
authors.lastname: Yang
authors.forename: Kohji
authors.initials: K
authors.lastname: Nishida
authors.forename: Yoshiro
authors.initials: Y
authors.lastname: Kobayashi
authors.forename: Teruo
authors.initials: T
authors.lastname: Okano
mesh_terms: D000818:Animals; D018952:Antigens, CD34 / Q000276:immunology / Q000378:metabolism; D002478:Cells, Cultured; D005434:Flow Cytometry; D006412:Hematopoietic Stem Cells / Q000378:metabolism*; D039661:Integrin beta3 / Q000276:immunology / Q000378:metabolism*; D051379:Mice; D008810:Mice, Inbred C57BL
chemical_list: D018952:Antigens, CD34; D039661:Integrin beta3