title: Characterization and regulation of the bovine stearoyl-CoA desaturase gene promoter.
abstract: The bovine stearoyl-CoA desaturase (Scd) gene plays an important role in the bovine mammary gland where substrates such as stearic and vaccenic acids are converted to oleic acid and conjugated linoleic acid (CLA), respectively. Up to 90% of the CLA in bovine milk is formed due to the action of this enzyme in the mammary gland. The areas of the bovine promoter of importance in regulating this key enzyme were examined and an area of 36bp in length was identified as having a critical role in transcriptional activation and is designated the Scd transcriptional enhancer element (STE). Electrophoretic mobility shift assay detected three binding complexes on this area in Mac-T cell nuclear extracts. Treatment of cells with CLA caused a significant reduction in transcriptional activity, with this effect being mediated through the STE region. The bovine Scd gene promoter was up-regulated by insulin and down-regulated by oleic acid.
authors.affiliation: Department of Animal Science, University of Vermont, Burlington, VT 05405, USA.
authors.forename: Aileen F
authors.initials: AF
authors.lastname: Keating
authors.forename: John J
authors.initials: JJ
authors.lastname: Kennelly
authors.forename: Feng-Qi
authors.initials: FQ
authors.lastname: Zhao
mesh_terms: D000818:Animals; D002417:Cattle / Q000235:genetics* / Q000378:metabolism; D024202:Electrophoretic Mobility Shift Assay; D004742:Enhancer Elements, Genetic / Q000235:genetics*; D005260:Female; D015971:Gene Expression Regulation, Enzymologic; D044243:Linoleic Acids, Conjugated / Q000096:biosynthesis / Q000235:genetics / Q000494:pharmacology; D009687:Nuclear Proteins / Q000378:metabolism; D011401:Promoter Regions, Genetic / Q000235:genetics*; D013230:Stearoyl-CoA Desaturase / Q000235:genetics*; D014158:Transcription, Genetic / Q000187:drug effects
chemical_list: D044243:Linoleic Acids, Conjugated; D009687:Nuclear Proteins; D013230:Stearoyl-CoA Desaturase