title: Species-specific posttranscriptional regulation of interferon synthesis.
abstract: Human fibroblast and Syrian hamster embryo cells were induced to synthesize interferon (IF) with rIn . rCn and rIn . rCn + DEAE-dextran, respectively. Following induction, these cells synthesized IF for only a short time before entering into a repressed state and shutting off the synthesis of IF. Homologous and heterologous whole cell translational systems were developed to investigate the molecular basis for the shut-off of IF synthesis. These systems allowedd for the introduction of exogenous hamster and human IF-mRNAs into intact normal and repressed hamster and human cells via an improved CaCl2 precipitation technique. Human IF-mRNA was translated in normal human and hamster cells and in repressed hamster cells but not in repressed human cells. In contrast, the hamster IF-mRNA was translated in normal human, normal hamster, and repressed human cells but not in repressed hamster cells. These results indicate that a species-specific mechanism inhibiting translation of IF-mRNA is directly responsible for the shut-off of IF synthesis in human fibroblasts and Syrian hamster embryo cells.
mesh_terms: D000818:Animals; D002460:Cell Line; D002472:Cell Transformation, Viral; D006224:Cricetinae; D005347:Fibroblasts / Q000378:metabolism; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007372:Interferons / Q000096:biosynthesis* / Q000302:isolation & purification; D007700:Kinetics; D008297:Male; D008647:Mesocricetus; D009522:Newcastle disease virus; D014176:Protein Biosynthesis; D012867:Skin / Q000378:metabolism; D014158:Transcription, Genetic
chemical_list: D007372:Interferons