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Induction of human HL-60 leukemic cell differentiation by immune interferon is accompanied by an increase in NADase
Biochemistry International
|July 1, 1985
Summary
Human immune interferon (IFN-gamma) promotes HL-60 leukemia cell differentiation into macrophage-like cells. This process involves increased NADase activity and altered protein synthesis, impacting DNA-binding proteins.
Area of Science:
- Cell Biology
- Immunology
- Biochemistry
Background:
- Human promyelocytic HL-60 leukemia cells are a model for studying myeloid differentiation.
- Interferons are cytokines with diverse biological activities, including effects on cell differentiation.
Purpose of the Study:
- To investigate the effects of highly purified human immune interferon-gamma (IFN-gamma) on HL-60 cell differentiation.
- To elucidate the biochemical and molecular changes associated with IFN-gamma-induced differentiation.
Main Methods:
- Culturing HL-60 cells with human immune IFN-gamma.
- Morphological assessment of cell differentiation.
- Enzyme activity assays (NADase) and kinetic analysis.
- Pulse labeling with [35S] methionine to study protein synthesis.
- DNA-agarose chromatography to analyze DNA-binding proteins.
Main Results:
- IFN-gamma treatment (100 units/ml for 5 days) induced morphological changes in HL-60 cells, resembling macrophages.
- A significant 3-fold increase in NADase specific activity was observed, with increased Vmax but unchanged Km.
- Altered de novo synthesis of several proteins was detected post-IFN-gamma treatment.
- A 60-70% reduction in newly synthesized DNA-binding proteins was observed in IFN-gamma treated cells.
Conclusions:
- Human immune IFN-gamma effectively induces differentiation of HL-60 leukemia cells towards a macrophage-like phenotype.
- IFN-gamma modulates cellular biochemistry by increasing NADase activity and altering protein synthesis profiles, including DNA-binding proteins.