title: Heterogeneity of human gamma interferon preparations: evidence for presence of alpha interferon.
abstract: Human gamma interferon (HulFN-gamma) preparations induced with several mitogens (Staphylococcal enterotoxin A, Phytohemagglutinin, or Pokeweed mitogen) had low levels of cross-species antiviral activity on bovine cells (approximately 1-5%) and were not neutralized by antisera to either human interferon alpha (HulFN-alpha) or beta (HulFN-beta). After purification on controlled pore glass beads (CPG) these preparations could be fractionated into a minor component which was highly active on bovine cells and a major component that was virtually inactive on bovine cells. The highly cross-active component was pH2 stable and was neutralized by an anti-HulFN-alpha antiserum, while the major, lowly cross-active component was pH2 labile and was not neutralized by either anti-HulFN-alpha or HulFN-beta antisera. Chromatography of a CPG-purified mitogen-induced IFN preparation on anti-HulFN-alpha Sepharose showed that, while the large majority of HulFN-gamma preparations passed through the column, a minor component was retained and eluted at pH2. Thus, human leukocyte suspensions stimulated by mitogens produced predominantly HulFN-gamma, but also produce some HulFN-alpha.
mesh_terms: D000818:Animals; D002417:Cattle; D002478:Cells, Cultured; D002846:Chromatography, Affinity; D002850:Chromatography, Gel; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007106:Immune Sera; D007369:Interferon Inducers; D007372:Interferons / Q000276:immunology / Q000302:isolation & purification*; D007962:Leukocytes / Q000276:immunology; D008934:Mitogens / Q000494:pharmacology; D014779:Virus Replication
chemical_list: D007106:Immune Sera; D007369:Interferon Inducers; D008934:Mitogens; D007372:Interferons