title: Generation of natural killer cells from long-term cultures of mouse bone marrow.
abstract: The features of a mouse long-term bone marrow culture (LTBMC) system that produces natural killer (NK) cell activity are described. Over a 4-week period in the NK-LTBMC, cellularity dropped from approximately 2.5 x 10(7) to 8 x 10(5) cells/25-cm2 flask. About 3 x 10(5) of these cells were loosely adherent. The cultures at this time contained about one-third the spleen colony forming units, one-tenth the granulocyte macrophage colony forming units and about one-third the transplantable NK progenitor activity of fresh bone marrow (BM), and no detectable NK cell activity. In the 4-week NK-LTBMC, IL-2-responsive precursor cells appeared to be selectively maintained and gave an 8-fold higher activity after culture with human recombinant IL-2 (rIL-2) than did fresh BM. The addition of 50-5,000 IU/ml of rIL-2 resulted, after a minimal 3-day lag, in progressively increased cellularity for as long as 13 days. The percentage and staining intensity of NK-1.1+ cells increased with time after addition of rIL-2. CD3 epsilon + cells were occasionally seen and B220+ cells were present in low numbers at day 7 and slowly increased through day 13. The stroma was necessary for IL-2-dependent development of NK activity.
authors.affiliation: Department of Radiation Oncology, University of Pittsburgh School of Medicine, Pa 15261.
authors.forename: F
authors.initials: F
authors.lastname: Vecchini
authors.forename: D
authors.initials: D
authors.lastname: Delfino
authors.forename: K D
authors.initials: KD
authors.lastname: Patrene
authors.forename: A
authors.initials: A
authors.lastname: DeLeo
authors.forename: L
authors.initials: L
authors.lastname: Lu
authors.forename: R B
authors.initials: RB
authors.lastname: Herberman
authors.forename: S S
authors.initials: SS
authors.lastname: Boggs
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal; D001853:Bone Marrow / Q000276:immunology*; D001854:Bone Marrow Cells; D002455:Cell Division; D002478:Cells, Cultured; D003114:Colony-Forming Units Assay; D003602:Cytotoxicity, Immunologic / Q000276:immunology; D005434:Flow Cytometry; D005677:G(M1) Ganglioside / Q000276:immunology; D016130:Immunophenotyping; D007376:Interleukin-2 / Q000276:immunology; D007694:Killer Cells, Natural / Q000166:cytology / Q000276:immunology*; D007958:Leukocyte Count; D008137:Longitudinal Studies; D051379:Mice; D008810:Mice, Inbred C57BL; D011994:Recombinant Proteins / Q000276:immunology
chemical_list: D000911:Antibodies, Monoclonal; D007376:Interleukin-2; D011994:Recombinant Proteins; D005677:G(M1) Ganglioside; C018835:asialo GM1 ganglioside