title: Reduction of 15-hydroxyprostaglandin dehydrogenase expression is an independent predictor of poor survival associated with enhanced cell proliferation in gastric adenocarcinoma.
abstract: Prostaglandin (PG) E(2) promotes gastrointestinal carcinogenesis and tumor progression. We determined the correlations between pattern of expression of 15-hydroxyprostaglandin dehydrogenase (15-PGDH), a catabolic enzyme for biological inactivation of PGE(2), in gastric adenocarcinoma and various clinicopathological factors and patient outcome in an attempt to elucidate its biological significance. In 35 of 71 cases of gastric adenocarcinoma, expression of 15-PGDH protein was reduced in tumor tissues. Multivariate analysis revealed reduction of 15-PGDH expression to be an independent predictor of poor survival. The proportion of Ki67-positive cells in 15-PGDH-negative adenocarcinoma was higher than that in 15-PGDH-positive adenocarcinoma. No differences were found in clinicopathological parameters between patients with cyclooxygenase-2 (COX-2)-positive tumors and those with COX-2 negative tumors. In an in vitro study, use of specific siRNA to silence 15-PGDH or a specific inhibitor of 15-PGDH enhanced cell proliferation in the gastric cancer cell line AGS, which expresses 15-PGDH. These findings suggest that reduction of 15-PGDH is an independent predictor of poor survival associated with enhancement of cell proliferation in gastric adenocarcinoma.
authors.affiliation: Department of Gastroenterology, Osaka City University Graduate School of Medicine, Osaka, Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Tatsuwaki
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Tanigawa
authors.forename: Toshio
authors.initials: T
authors.lastname: Watanabe
authors.forename: Hirohisa
authors.initials: H
authors.lastname: Machida
authors.forename: Hirotoshi
authors.initials: H
authors.lastname: Okazaki
authors.forename: Hirokazu
authors.initials: H
authors.lastname: Yamagami
authors.forename: Masatsugu
authors.initials: M
authors.lastname: Shiba
authors.forename: Kenji
authors.initials: K
authors.lastname: Watanabe
authors.forename: Kazunari
authors.initials: K
authors.lastname: Tominaga
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Fujiwara
authors.forename: Nobuhide
authors.initials: N
authors.lastname: Oshitani
authors.forename: Kazuya
authors.initials: K
authors.lastname: Muguruma
authors.forename: Tetsuji
authors.initials: T
authors.lastname: Sawada
authors.forename: Kosei
authors.initials: K
authors.lastname: Hirakawa
authors.forename: Kazuhide
authors.initials: K
authors.lastname: Higuchi
authors.forename: Tetsuo
authors.initials: T
authors.lastname: Arakawa
mesh_terms: D000230:Adenocarcinoma / Q000201:enzymology* / Q000401:mortality / Q000473:pathology; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D049109:Cell Proliferation; D051546:Cyclooxygenase 2 / Q000032:analysis; D015232:Dinoprostone / Q000378:metabolism; D005260:Female; D006801:Humans; D006911:Hydroxyprostaglandin Dehydrogenases / Q000032:analysis*; D019394:Ki-67 Antigen / Q000032:analysis; D008297:Male; D008875:Middle Aged; D013274:Stomach Neoplasms / Q000201:enzymology* / Q000401:mortality / Q000473:pathology
chemical_list: D019394:Ki-67 Antigen; D006911:Hydroxyprostaglandin Dehydrogenases; C035859:15-hydroxyprostaglandin dehydrogenase; D051546:Cyclooxygenase 2; C496540:PTGS2 protein, human; D015232:Dinoprostone