title: Production and characterization of poly(I):poly(C)-induced rat interferons in vitro.
abstract: The synthetic polyribonucleotide polyinosinate:polycytidylate [poly(I):poly(C)] was used to induce interferon (IFN) production in a rat leiomyosarcoma cell line. Three separate IFN species were distinguished by antiviral activity on homologous and heterologous cells, interaction with Blue Sepharose CL-6B chromatography matrix, and antibody neutralization studies. Two IFN species, one with a weakly ionic and the other with a hydrophobic interaction with Blue Sepharose, exhibited heterologous antiviral activity, and were acid- and heat-labile. Both had a molecular weight of 30,000 daltons by HPLC-based molecular exclusion chromatography. The weakly ionic species was neutralized only by antiserum to L-cell IFN, whereas the hydrophobic species was neutralized by antiserum to L-cell IFN and antiserum to human leukocyte IFN. The remaining IFN species, with a weakly ionic interaction with Blue Sepharose, was acid- and heat-stable, exhibited no heterologous cell antiviral activity, and was not neutralized by any antisera to IFN. This species had a molecular weight of 39,000 daltons by HPLC-based molecular exclusion chromatography and 34,000 daltons by sodium dodecyl sulfate-polyacrylamide gel electrophoresis. These rat fibroblast IFNs possess greater heterogeneity than that reported or observed for murine or human fibroblast IFNs. These IFNs could thus be classified as follows: one species of rat IFN-beta and two different species of unique acid-labile rat IFNs.
mesh_terms: D000818:Animals; D002460:Cell Line; D006863:Hydrogen-Ion Concentration; D007370:Interferon Type I / Q000096:biosynthesis* / Q000145:classification / Q000302:isolation & purification; D007890:Leiomyosarcoma / Q000276:immunology; D008970:Molecular Weight; D009500:Neutralization Tests; D011070:Poly I-C / Q000494:pharmacology*; D051381:Rats; D013045:Species Specificity
chemical_list: D007370:Interferon Type I; D011070:Poly I-C