title: Enhancement of prostaglandin D(2) production through cyclooxygenase-2 and lipocalin-type prostaglandin D synthase by upstream stimulatory factor 1 in human brain-derived TE671 cells under serum starvation.
abstract: We found that prostaglandin (PG) D(2) production was induced through transcriptional activation of cyclooxygenase (COX)-2 and lipocalin-type PGD synthase (L-PGDS) genes under serum-starved conditions in human brain-derived TE671 cells. Analysis of promoter and intron regions of the human L-PGDS gene demonstrated that an atypical E-box within intron 4 mediated serum starvation-induced up-regulation of L-PGDS gene expression. The results of electrophoretic mobility shift assay and chromatin immunoprecipitation assay showed that upstream stimulatory factor (USF) 1 bound to this atypical E-box. USF1 gene expression was also enhanced during serum starvation in TE671 cells through activation of p38 mitogen activated protein kinase, and the efficiency of the binding of USF1 to the atypical E-box was clearly increased by serum starvation. Administration of USF1 siRNA suppressed both L-PGDS and COX-2 gene expression and PGD(2) production. Moreover, NS-398, a COX-2 inhibitor and AT-56, an L-PGDS inhibitor, suppressed PGD(2) production in TE671 cells cultured under the serum-starved condition. These results indicate that PGD(2) production stimulated by serum starvation is mediated by both COX-2 and L-PGDS through enhancement of USF1 in TE671 cells.
authors.affiliation: Laboratory of Biodefense and Regulation, Osaka University of Pharmaceutical Sciences, 4-20-1 Nasahara, Takatsuki, Osaka 569-1094, Japan.
authors.forename: Ko
authors.initials: K
authors.lastname: Fujimori
authors.forename: Kosuke
authors.initials: K
authors.lastname: Aritake
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Urade
mesh_terms: D001921:Brain / Q000166:cytology / Q000378:metabolism; D002478:Cells, Cultured; D016895:Culture Media, Serum-Free; D051546:Cyclooxygenase 2 / Q000235:genetics* / Q000378:metabolism; D015971:Gene Expression Regulation, Enzymologic; D017930:Genes, Reporter; D006801:Humans; D019746:Intramolecular Oxidoreductases / Q000096:biosynthesis / Q000235:genetics*; D007438:Introns; D054834:Lipocalins / Q000096:biosynthesis / Q000235:genetics*; D008156:Luciferases / Q000378:metabolism; D011401:Promoter Regions, Genetic; D015230:Prostaglandin D2 / Q000235:genetics* / Q000378:metabolism; D034741:RNA, Small Interfering / Q000378:metabolism; D051720:Upstream Stimulatory Factors / Q000235:genetics* / Q000378:metabolism
chemical_list: D016895:Culture Media, Serum-Free; D054834:Lipocalins; D034741:RNA, Small Interfering; C497181:USF1 protein, human; D051720:Upstream Stimulatory Factors; D008156:Luciferases; D051546:Cyclooxygenase 2; C496540:PTGS2 protein, human; D019746:Intramolecular Oxidoreductases; C022466:prostaglandin R2 D-isomerase; D015230:Prostaglandin D2