title: Different mechanisms regulate the IFN-inducible expression of 40 kDa human 2'-5' oligo (A) synthetase in HeLa and Molt 4 cells.
abstract: Expression of 40 kDa 2'-5' oligo (A) synthetase can serve as a marker of interferon (IFN) activity on the biological target. The mechanisms of induction of human 40 kDa 2'-5' oligo (A) synthetase by IFNs were investigated in HeLa and Molt 4 cells. Using a combined treatment with cycloheximide and actinomycin D we observed that in HeLa cells IFN-alpha did not need ongoing protein synthesis to induce the enzyme, whereas the addition of cycloheximide prevented the induction by IFN-gamma. IFN-alpha induced the 40 kD enzyme in the T-cell line Molt 4 to a level comparable to that in HeLa cells, but only in the presence of active protein synthesis. These results suggest that an early response gene coding for a positive IFN-inducible protein may be needed in T cells, but not in HeLa cells to regulate the transcription of this 2'-5' oligo (A) synthetase gene.
authors.affiliation: Institute of Microbiology, Medical School, University of Torino, Italy.
authors.forename: G
authors.initials: G
authors.lastname: Gribaudo
authors.forename: M
authors.initials: M
authors.lastname: Fizzotti
authors.forename: M G
authors.initials: MG
authors.lastname: Cocciolo
authors.forename: G
authors.initials: G
authors.lastname: Cavallo
authors.forename: S
authors.initials: S
authors.lastname: Landolfo
mesh_terms: D015088:2',5'-Oligoadenylate Synthetase / Q000096:biosynthesis* / Q000235:genetics; D015415:Biomarkers; D002460:Cell Line; D003513:Cycloheximide / Q000494:pharmacology; D003609:Dactinomycin / Q000494:pharmacology; D015971:Gene Expression Regulation, Enzymologic / Q000187:drug effects; D006367:HeLa Cells; D006801:Humans; D007370:Interferon Type I / Q000494:pharmacology*; D007371:Interferon-gamma / Q000494:pharmacology*; D008970:Molecular Weight
chemical_list: D015415:Biomarkers; D007370:Interferon Type I; D003609:Dactinomycin; D007371:Interferon-gamma; D003513:Cycloheximide; D015088:2',5'-Oligoadenylate Synthetase