title: Haematopoiesis in the aged as studied by in vitro colony assay.
abstract: Changes occurring in human haematopoiesis with advancing age were studied using an in vitro haematopoietic colony assay in 22 elderly subjects with unexplained anaemia, and in 15 elderly and 15 young subjects without anaemia. Both elderly groups were found to have significantly lower numbers of bone marrow early erythroid-committed progenitors (BFU-E) than the young controls. The elderly anaemic group also showed significantly lower numbers of granulocyte/macrophage progenitors (CFU-GM) than the young controls. However, the responses of the erythroid-committed progenitors in the elderly groups to erythropoietin and burst-promoting activity were similar to those observed in the young controls. Therefore, it is probable that anaemia tends to occur easily in elderly individuals as a result of reduction of reserves of haematopoietic progenitors with advancing age.
authors.affiliation: First Department of Internal Medicine, Faculty of Medicine, Kyushu University, Fukuoka, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Hirota
authors.forename: S
authors.initials: S
authors.lastname: Okamura
authors.forename: N
authors.initials: N
authors.lastname: Kimura
authors.forename: T
authors.initials: T
authors.lastname: Shibuya
authors.forename: Y
authors.initials: Y
authors.lastname: Niho
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000375:Aging / Q000097:blood*; D000740:Anemia / Q000097:blood*; D001853:Bone Marrow / Q000502:physiology; D002452:Cell Count; D003114:Colony-Forming Units Assay; D005260:Female; D006412:Hematopoietic Stem Cells / Q000502:physiology*; D006801:Humans; D007962:Leukocytes / Q000502:physiology; D008297:Male; D010835:Phytohemagglutinins
chemical_list: D010835:Phytohemagglutinins