title: Interferon-gamma induced increases in intracellular cathepsin B activity in THP-1 cells are dependent on RNA transcription.
abstract: Interferon-gamma (IFN-gamma) treatment of human macrophages induces increased intracellular levels of cathepsin B (CB), a lysosomal cysteine proteinase which is implicated in inflammatory tissue injury. To determine the mechanism of the increase, we studied the macrophage-like cell line, THP-1. Dose and time dependent increases in intracellular CB were seen when cells primed with phorbol ester (PMA) were cultured with IFN-gamma. To determine whether protein synthesis was required for the increase, PMA primed cells were cultured in the presence of IFN-gamma and cycloheximide: The expected increase was inhibited. To determine whether RNA synthesis was required for the IFN-gamma induced increases, PMA primed cells were cultured in the presence of IFN-gamma and actinomycin D. Again the expected increases were not seen. Direct measurement of CB mRNA levels showed increases in cells not treated with inhibitors. These results suggest that the IFN-gamma induced increases in THP-1 cell CB are dependent on RNA and protein synthesis.
authors.affiliation: The Medical Research Service, Baltimore VAMC, MD 21201, USA.
authors.forename: Q
authors.initials: Q
authors.lastname: Li
authors.forename: C T
authors.initials: CT
authors.lastname: Bever
mesh_terms: D002401:Cathepsin B / Q000378:metabolism*; D003609:Dactinomycin / Q000494:pharmacology; D004357:Drug Synergism; D006801:Humans; D007223:Infant; D007371:Interferon-gamma / Q000494:pharmacology*; D007425:Intracellular Membranes / Q000378:metabolism*; D007700:Kinetics; D008264:Macrophages / Q000187:drug effects* / Q000378:metabolism*; D011500:Protein Synthesis Inhibitors / Q000494:pharmacology; D012313:RNA / Q000235:genetics*; D011994:Recombinant Proteins; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology; D014158:Transcription, Genetic; D014407:Tumor Cells, Cultured
chemical_list: D011500:Protein Synthesis Inhibitors; D011994:Recombinant Proteins; D003609:Dactinomycin; D012313:RNA; D007371:Interferon-gamma; D002401:Cathepsin B; D013755:Tetradecanoylphorbol Acetate