title: Induced and down-regulated proteins in the human cultured hairy cell leukemia line JOK-1 and the Burkitt's lymphoma cell line Daudi during incubation with interferon-alpha: a kinetic study.
abstract: To elucidate the mechanism of action of interferon-alpha (IFN-alpha), the effect on cell proliferation and protein synthesis in the human hairy cell leukemia line JOK-1 and the Burkitt's lymphoma cell line Daudi were investigated. While Daudi cells were inhibited in proliferation and in total protein synthesis, no effect was seen on JOK-1 cells. However, high-resolution two-dimensional gel electrophoresis showed that four polypeptides were induced in JOK-1 cells after IFN-alpha incubation, while an additional 11 were induced and two down-regulated in Daudi cells. Kinetic studies revealed that the changes in JOK-1 cells were only temporary (within 8-16 h) and small to moderate in magnitude (less than four-fold). In Daudi cells, the changes for two of these polypeptides were early (within 2 h), for most of them prolonged (at least 24 h), and for three of them of great magnitude (between 6- and 30-fold). Quantitative analytical assessments indicated that four IFN-alpha-inducible polypeptides, present in low amounts of untreated cells, were highly expressed only in sensitive Daudi cells upon IFN-alpha treatment. This observation might indicate a role for these polypeptides in the inhibition of cell proliferation in Daudi cells. Furthermore, six of the other IFN-alpha-modulated polypeptides were synthesized constitutively in JOK-1 cells at levels comparable to those achieved in IFN-alpha-treated Daudi cells.(ABSTRACT TRUNCATED AT 250 WORDS)
authors.affiliation: Department of Immunology, University of Aarhus, Denmark.
authors.forename: P S
authors.initials: PS
authors.lastname: Madsen
authors.forename: B
authors.initials: B
authors.lastname: Nielsen
authors.forename: A W
authors.initials: AW
authors.lastname: Jensen
authors.forename: J
authors.initials: J
authors.lastname: Justesen
authors.forename: J
authors.initials: J
authors.lastname: Ellegaard
authors.forename: P
authors.initials: P
authors.lastname: Hokland
authors.forename: M
authors.initials: M
authors.lastname: Hokland
mesh_terms: D002051:Burkitt Lymphoma / Q000378:metabolism*; D002455:Cell Division / Q000187:drug effects; D015536:Down-Regulation / Q000187:drug effects*; D015180:Electrophoresis, Gel, Two-Dimensional; D006801:Humans; D016898:Interferon-alpha / Q000494:pharmacology*; D007700:Kinetics; D007943:Leukemia, Hairy Cell / Q000378:metabolism* / Q000473:pathology; D009363:Neoplasm Proteins / Q000096:biosynthesis*; D010452:Peptide Biosynthesis; D013936:Thymidine / Q000378:metabolism; D014407:Tumor Cells, Cultured
chemical_list: D016898:Interferon-alpha; D009363:Neoplasm Proteins; D013936:Thymidine