title: Interleukin-1 and tumour necrosis factor production by human monocytoid cells: study on a single cell level.
abstract: Human IL-1 beta and TNF alpha production by normal and transformed monocytoid cells was studied using biological assays, cytokine specific ELISA and by immunocytochemical methods on a single cell level. Quiescent human blood monocytes and cultured in vitro transformed human monocytoid cell lines U-937, THP-1 and HL-60 did not contain IL-1 beta and TNF alpha in their cytoplasm. IL-1 beta synthesis and secretion was induced by LPS stimulation in nearly 90% monocytes, 15-20% U-937, 3-5% THP-1 and in no HL-60 cells. Normal human blood monocytes had a more rapid kinetics of IL-1 beta synthesis. IL-1 beta positive cells stained with antibodies to human IL-1 beta appeared at 1-2 hours after LPS application, while in monocytic cell lines only after 4-6 hours. Using immunoperoxidase staining of U-937 cells pulse labelled with 3H-thymidine, it was shown that proliferating cells did not synthetize IL-1 beta. Instead of IL-1 beta, TNF alpha could be induced by LPS in U-937 cells only after preliminary differentiation with PMA. Recombinant IL-1 beta induced a very low level of TNF alpha production in PMA-treated cells. Similarly recombinant TNF alpha alone induced IL-1 beta synthesis only in a few U-937 cells.
authors.affiliation: Research Institute of Highly Pure Biochemicals, St. Petersburg, Russia.
authors.forename: A
authors.initials: A
authors.lastname: Simbirtsev
authors.forename: E
authors.initials: E
authors.lastname: Prokopieva
authors.forename: E
authors.initials: E
authors.lastname: Ivanova
authors.forename: V
authors.initials: V
authors.lastname: Konusova
authors.forename: N D
authors.initials: ND
authors.lastname: Perumov
authors.forename: S
authors.initials: S
authors.lastname: Ketlinsky
mesh_terms: D001681:Biological Assay; D002454:Cell Differentiation; D002460:Cell Line; D004797:Enzyme-Linked Immunosorbent Assay; D006801:Humans; D007150:Immunohistochemistry; D066298:In Vitro Techniques; D007375:Interleukin-1 / Q000096:biosynthesis*; D007700:Kinetics; D008070:Lipopolysaccharides / Q000494:pharmacology; D009000:Monocytes / Q000166:cytology / Q000276:immunology / Q000378:metabolism*; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology; D014409:Tumor Necrosis Factor-alpha / Q000096:biosynthesis*
chemical_list: D007375:Interleukin-1; D008070:Lipopolysaccharides; D014409:Tumor Necrosis Factor-alpha; D013755:Tetradecanoylphorbol Acetate