title: Interferon-alpha and -gamma promote myeloid differentiation of HL-60, a human acute promyelocytic leukemia cell line.
abstract: Two different preparations of ultrapurified interferon-alpha (IFN-alpha) (lymphoblastoid and peripheral blood leukocyte) and one of IFN-gamma were tested for their ability to induce terminal differentiation and alter cell growth in three human leukemia cell lines of different hematological origin (HL-60, K562, U937). Cell lines were cultured for 9 days in the presence of 500 units/ml of either IFN-alpha or of IFN-gamma. Cell counts and stained differentials were made on days 3, 6, and 9 to assess the effects of IFN. A marked heterogeneity of response was found, not only among cell lines, but among the IFNs tested. The most striking morphological changes were noted in the HL-60 acute promyelocytic leukemia cell line. All three IFNs tested induced significant myeloid maturation, with increased numbers of terminally differentiated myelocytes and metamyelocytes seen as early as day 3 of culture. The feasibility of using IFNs as an adjunctive or alternative therapy for the treatment of some types of leukemias is discussed.
mesh_terms: D002454:Cell Differentiation / Q000187:drug effects*; D002455:Cell Division / Q000187:drug effects; D002460:Cell Line; D006410:Hematopoiesis / Q000187:drug effects; D006801:Humans; D007370:Interferon Type I / Q000502:physiology*; D007371:Interferon-gamma / Q000502:physiology*; D015470:Leukemia, Myeloid, Acute / Q000473:pathology*
chemical_list: D007370:Interferon Type I; D007371:Interferon-gamma