2',5'-Oligoadenylate synthetase-uninducible alpha/beta-interferon-resistant Friend cells develop an antiviral state when permeabilized with lysolecithin and treated with 2',5'-oligoadenylate oligomers.
Variant sublines of Friend erythroleukemia cells (FLC) that do not respond to alpha/beta-interferon (IFN-alpha/beta) by developing an antiviral state but respond partially to IFN-gamma with an induced antiviral state, lack the ability to induce the 2',5'-oligoadenylate (2-5A) synthetase pathway. Exposure of wild-type and variant cells to exogenous 2-5A oligomers made permeable with lysolecithin resulted in 50-70% inhibition of protein synthesis. Further, the replication of vesicular stomatitis virus in IFN-resistant 2-5A synthetase-deficient FLC exposed to 2-5A trimer was inhibited to the same extent as in wild-type cells. Last, a significant cleavage of ribosomal RNA was observed in samples of total RNAs extracted from variant and wild-type permeabilized FLC, but only if they were exposed to 2-5A. These data are compatible with the conclusion that (i) the activation of the 2-5A-dependent endoribonuclease is not impaired in the variant cells, and (ii) the uninducibility of 2-5A synthetase can be bypassed by exogenously introducing its products, which leads to the establishment of a bona fide antiviral state.
Federico
M
M
Romeo
G
G
Affabris
E
E
Coccia
E M
EM
Rossi
G B
GB
D015088:2',5'-Oligoadenylate Synthetase / Q000096:biosynthesis*; D000227:Adenine Nucleotides / Q000494:pharmacology; D000818:Animals; D004351:Drug Resistance; D004722:Endoribonucleases / Q000378:metabolism; D004790:Enzyme Induction / Q000187:drug effects; D007370:Interferon Type I / Q000494:pharmacology*; D004915:Leukemia, Erythroblastic, Acute / Q000276:immunology* / Q000378:metabolism; D008244:Lysophosphatidylcholines / Q000494:pharmacology; D051379:Mice; D009363:Neoplasm Proteins / Q000096:biosynthesis; D009843:Oligoribonucleotides / Q000494:pharmacology; D010539:Permeability; D014779:Virus Replication / Q000187:drug effects
D000227:Adenine Nucleotides; D007370:Interferon Type I; D008244:Lysophosphatidylcholines; D009363:Neoplasm Proteins; D009843:Oligoribonucleotides; C023505:2',5'-oligoadenylate; D015088:2',5'-Oligoadenylate Synthetase; D004722:Endoribonucleases; C031956:2-5A-dependent ribonuclease