title: PGE2 production in oral cancer cell lines is COX-2-dependent.
abstract: It has been suggested that epithelial cyclooxygenase-2 (COX-2) promotes oral carcinogenesis and carcinoma malignancy through increased prostaglandin E(2) (PGE(2)) production. Although oral squamous cell carcinomas (OSCC) often express COX-2, they may also produce PGE(2) in a COX-1-dependent manner. We used 6 isolated cell lines to investigate which COX isoforms OSCC may use for PGE(2) production. COX-1 and -2 expression patterns divided the 6 OSCC cell lines into 3 distinct groups: both COX isoforms low, only COX-1 high, or both COX isoforms high. Multicolor immunohistofluorescence staining confirmed the COX-expression profiles in organotypic 3D cultures and the COX-2 dominance in OSCC tumors. Epidermal growth factor (EGF) stimulation induced COX-2 (but not COX-1) expression and increased PGE(2) production, which was attenuated by COX-2 (but not COX-1) specific inhibition or siRNA-mediated COX-2 gene knockdown. Thus, PGE(2) production in OSCC cell lines was COX-2-dependent.
authors.affiliation: Laboratory for Mucosal Immunology, Department of Oral Biology, University of Oslo, P.b. 1052, Blindern, Oslo 0316, Norway.
authors.forename: C
authors.initials: C
authors.lastname: Husvik
authors.forename: C
authors.initials: C
authors.lastname: Khuu
authors.forename: M
authors.initials: M
authors.lastname: Bryne
authors.forename: T S
authors.initials: TS
authors.lastname: Halstensen
mesh_terms: D000368:Aged; D002294:Carcinoma, Squamous Cell / Q000378:metabolism*; D045744:Cell Line, Tumor; D051545:Cyclooxygenase 1 / Q000378:metabolism; D051546:Cyclooxygenase 2 / Q000378:metabolism*; D016861:Cyclooxygenase Inhibitors / Q000494:pharmacology; D015232:Dinoprostone / Q000096:biosynthesis* / Q000235:genetics; D004815:Epidermal Growth Factor / Q000494:pharmacology; D005260:Female; D015870:Gene Expression / Q000187:drug effects; D055785:Gene Knockdown Techniques; D006801:Humans; D019746:Intramolecular Oxidoreductases / Q000096:biosynthesis; D007527:Isoenzymes / Q000096:biosynthesis; D008297:Male; D008875:Middle Aged; D009062:Mouth Neoplasms / Q000378:metabolism*; D000071876:Prostaglandin-E Synthases; D034741:RNA, Small Interfering / Q000494:pharmacology
chemical_list: D016861:Cyclooxygenase Inhibitors; D007527:Isoenzymes; D034741:RNA, Small Interfering; D004815:Epidermal Growth Factor; D051545:Cyclooxygenase 1; D051546:Cyclooxygenase 2; D019746:Intramolecular Oxidoreductases; D000071876:Prostaglandin-E Synthases; D015232:Dinoprostone