title: 150-kD oxygen-regulated protein is an essential factor for insulin release.
abstract: OBJECTIVE
  This study was designed to show the induction and function of 150-kD oxygen-regulated protein (ORP150) in insulin secretion in vitro.
  
  
  METHODS
  A mouse beta-cell line, MIN6 cells, was cultured in medium containing potassium channel openers or various concentrations of glucose (2-25 mmol/L). ORP150 expression was studied by reporter assay, Western blot, or Northern blot analysis, concomitantly with insulin secretion. In addition, MIN6 cells infected with ORP150 recombinant adenovirus were adopted to show the function of ORP150 in insulin release.
  
  
  RESULTS
  ORP150 expression in MIN6 cells was suppressed dose-dependently by the potassium channel opener diazoxide. Both low glucose (<2 mmol/L) and high glucose concentrations (25 mmol/L glucose) significantly induced more ORP150 expression compared with 10 mmol/L glucose. The treatment with diazoxide or infection of ORP150 antisense adenovirus suppressed ORP150 expression, and glucose-stimulated insulin secretion was effectively prevented.
  
  
  CONCLUSIONS
  These findings show the involvement of ORP150 in insulin secretion in MIN6 cells.
authors.affiliation: HSP Research Institute, Kyoto Research Park, Kyoto, Japan.
authors.forename: Tomohiro
authors.initials: T
authors.lastname: Kobayashi
authors.forename: Yasuhiko
authors.initials: Y
authors.lastname: Ohta
mesh_terms: D000256:Adenoviridae / Q000235:genetics; D000818:Animals; D016375:Antisense Elements (Genetics); D045744:Cell Line, Tumor; D019806:Cromakalim / Q000494:pharmacology; D003981:Diazoxide / Q000494:pharmacology; D017930:Genes, Reporter; D005947:Glucose / Q000494:pharmacology; D018840:HSP70 Heat-Shock Proteins; D007328:Insulin / Q000378:metabolism*; D000078790:Insulin Secretion; D050417:Insulin-Secreting Cells / Q000166:cytology / Q000378:metabolism*; D007340:Insulinoma; D051379:Mice; D020110:Pinacidil / Q000494:pharmacology; D015221:Potassium Channels / Q000502:physiology; D011506:Proteins / Q000235:genetics* / Q000378:metabolism*; D014665:Vasodilator Agents / Q000494:pharmacology
chemical_list: D016375:Antisense Elements (Genetics); D018840:HSP70 Heat-Shock Proteins; D007328:Insulin; D015221:Potassium Channels; D011506:Proteins; D014665:Vasodilator Agents; C050087:oxygen-regulated proteins; D019806:Cromakalim; D020110:Pinacidil; D005947:Glucose; D003981:Diazoxide