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- W2078345504 abstract "Interferon-gamma (IFN-gamma) is a pleiotropic cytokine involved in the regulation of various phases of immune and inflammatory responses; it also has anti-viral and anti-proliferative activity. Using continuous human leukaemia cell lines as model systems, we found that IFN-gamma stimulated the proliferation of leukaemic myeloid cells; this effect was specifically neutralized by an anti-IFN-gamma monoclonal antibody (McAb). No proliferative response was seen in autonomously growing cell lines; however, 11/19 constitutively growth factor-dependent cell lines showed a significant response in short-term proliferation assays upon incubation with IFN-gamma. The stimulation indices ranged from 2 to 37 compared with the untreated control cells; the EC50 values for these cell lines were in the range of 0.1-0.6 ng/ml IFN-gamma. Flow cytometric analysis demonstrated heterogeneity in the expression of the IFN-gamma receptor, as it was found on 37-97% of the cells per cell line. The effects of IFN-gamma on proliferation triggered by a spectrum of 10 other cytokines were variable, and both stimulation and attenuation of the proliferative responses were seen in different cell lines. Under serum-free culture conditions, IFN-gamma acted as a survival factor suppressing apoptosis. As has been described for other functional processes triggered by IFN-gamma, the proliferation-inducing activity of IFN-gamma also led to activation of the signal transducing element STAT 1. Thus, IFN-gamma can induce myeloid leukaemia cells to proliferate and can modulate their proliferative response to other cytokines. Therefore IFN-gamma may be a pathologically relevant ligand for leukaemic cell proliferation in vivo. In physiological settings, IFN-gamma might be a bifunctional regulator of haemopoietic cell proliferation, depending on other differential co-signals from the micro-environment." @default.
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- W2078345504 date "1997-09-01" @default.
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- W2078345504 title "Interferon‐gamma induced proliferation of human myeloid leukaemia cell lines" @default.
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- W2078345504 doi "https://doi.org/10.1046/j.1365-2141.1997.2673084.x" @default.
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