title: Opposite nuclear level and binding activity of STAT5B and STAT3 proteins with rat haptoglobin gene under normal and turpentine induced acute phase conditions.
abstract: Transcription of the rat gene encoding haptoglobin (Hp) is highly induced during acute phase (AP) response which has been previously shown to be mediated by inducible STAT3 member of the Signal Transducer and Activators of Transcription (STATs) family proteins. In this study, we observed that under normal but not in the turpentine induced AP conditions, another member of the STAT family proteins, STAT5b is expressed and binds to the hormone regulatory element (HRE) of the rat Hp gene. We found that the nuclear amounts of constitutively active STAT5b in rat liver decreased significantly with time of turpentine treatment as opposed to that of cytosol STAT5b, suggesting possible export of constitutive STAT5b from the nucleus. Nuclear accumulation and binding of inducible STAT3 proteins to the rat Hp gene HRE following turpentine treatment implicated that STAT5b negatively regulates Hp gene expression during normal conditions.
authors.affiliation: Institute for Biological Research, Department for Molecular Biology, Belgrade, Yugoslavia. iligri&ibiss.bg.ac.yu
authors.forename: I
authors.initials: I
authors.lastname: Grigorov
authors.forename: T
authors.initials: T
authors.lastname: Lazić
authors.forename: I
authors.initials: I
authors.lastname: Cvetković
authors.forename: T
authors.initials: T
authors.lastname: Milosavljević
authors.forename: M
authors.initials: M
authors.lastname: Petrović
mesh_terms: D000210:Acute-Phase Reaction / Q000139:chemically induced* / Q000235:genetics*; D000818:Animals; D015153:Blotting, Western; D002467:Cell Nucleus / Q000378:metabolism*; D003600:Cytosol / Q000378:metabolism; D004247:DNA / Q000235:genetics / Q000378:metabolism*; D004268:DNA-Binding Proteins / Q000378:metabolism*; D006242:Haptoglobins / Q000235:genetics*; D008099:Liver / Q000378:metabolism; D008894:Milk Proteins; D011485:Protein Binding; D051381:Rats; D020218:Response Elements / Q000235:genetics; D050796:STAT3 Transcription Factor; D050799:STAT5 Transcription Factor; D013997:Time Factors; D015534:Trans-Activators / Q000378:metabolism*; D014158:Transcription, Genetic / Q000187:drug effects; D014425:Turpentine / Q000494:pharmacology
chemical_list: D004268:DNA-Binding Proteins; D006242:Haptoglobins; D008894:Milk Proteins; D050796:STAT3 Transcription Factor; D050799:STAT5 Transcription Factor; C494088:Stat3 protein, rat; C494097:Stat5b protein, rat; D015534:Trans-Activators; D004247:DNA; D014425:Turpentine