title: Differentiated HL-60 promyelocytic leukaemia cells produce a factor inducing differentiation.
abstract: The bipotential human promyelocytic leukaemia cell line HL-60 can be induced to differentiate into monocytic or granulocytic cells by treatment with 1,25 dihydroxyvitamin D3 (1,25(OH)2D3) or dimethylsulphoxide (DMSO) respectively. Conditioned media (CM) from 1,25(OH)2D3- or DMSO-treated cells were able to induce monocytic differentiation in fresh HL-60 cells as measured by induction of non-specific esterase and macrophage surface markers. CM from 1,25(OH)2D3-treated cells also led to a dose dependent loss of proliferative capacity in soft agar colony assays. These effects were not due to a toxic effect of the CM or to residual inducer present in the CM. gamma-interferon and GM-CSF were apparently not responsible for these effects. CM from the human histiocytic lymphoma cell line U937 led to only a low level of induction of macrophage differentiation in fresh HL-60 cells. The defect in HL-60 leukaemic cells may therefore be at the level of induction of an autonomously-produced differentiation factor.
authors.forename: B
authors.initials: B
authors.lastname: Djulbegović
authors.forename: S E
authors.initials: SE
authors.lastname: Christmas
authors.forename: M
authors.initials: M
authors.lastname: Moore
mesh_terms: D002117:Calcitriol / Q000494:pharmacology; D002454:Cell Differentiation / Q000187:drug effects*; D002455:Cell Division / Q000187:drug effects; D002460:Cell Line; D003470:Culture Media; D004121:Dimethyl Sulfoxide / Q000494:pharmacology; D006801:Humans; D015470:Leukemia, Myeloid, Acute / Q000378:metabolism / Q000473:pathology*; D008264:Macrophages / Q000473:pathology
chemical_list: D003470:Culture Media; D002117:Calcitriol; D004121:Dimethyl Sulfoxide