Reduction of 15-hydroxyprostaglandin dehydrogenase expression is an independent predictor of poor survival associated with enhanced cell proliferation in gastric adenocarcinoma.
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.
Tatsuwaki
Hiroshi
H
Department of Gastroenterology, Osaka City University Graduate School of Medicine, Osaka, Japan.
Tanigawa
Tetsuya
T
Watanabe
Toshio
T
Machida
Hirohisa
H
Okazaki
Hirotoshi
H
Yamagami
Hirokazu
H
Shiba
Masatsugu
M
Watanabe
Kenji
K
Tominaga
Kazunari
K
Fujiwara
Yasuhiro
Y
Oshitani
Nobuhide
N
Muguruma
Kazuya
K
Sawada
Tetsuji
T
Hirakawa
Kosei
K
Higuchi
Kazuhide
K
Arakawa
Tetsuo
T
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
D019394:Ki-67 Antigen; D006911:Hydroxyprostaglandin Dehydrogenases; C035859:15-hydroxyprostaglandin dehydrogenase; D051546:Cyclooxygenase 2; C496540:PTGS2 protein, human; D015232:Dinoprostone