Journal Article

Expression of 15-PGDH is downregulated by COX-2 in gastric cancer

Zhenxiong Liu, Xin Wang, Yuanyuan Lu, Shuang Han, Faming Zhang, Huihong Zhai, Ting Lei, Jie Liang, Jun Wang, Kaichun Wu and Daiming Fan

in Carcinogenesis

Volume 29, issue 6, pages 1219-1227
Published in print June 2008 | ISSN: 0143-3334
Published online January 2008 | e-ISSN: 1460-2180 | DOI:
Expression of 15-PGDH is downregulated by COX-2 in gastric cancer

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To explore the proteins regulated by cyclooxygenase-2 (COX-2) in gastric cancer, the expression plasmid of COX-2siRNA was constructed and transfected into gastric cancer cell line SGC7901. Then, two-dimensional electrophoresis and the PDQuest software analysis were applied to discover the differentially expressed proteins. The differential protein spots were analyzed by matrix-assisted laser desorption/ionization time of flight mass spectrometry. Fourteen differentially expressed proteins between the two cell lines were identified. 15-Hydroxyprostaglandin dehydrogenase [NAD+] (15-PGDH), a key enzyme in prostaglandin degradation, was identified as an upregulated protein in SGC7901 cells transfected with the COX-2siRNA plasmid. To further explore whether the 15-PGDH is regulated by COX-2, western blotting and immunocytochemical assay were performed to detect the expression of 15-PGDH in different cell lines with different expression level of COX-2. The results showed that the expression of 15-PGDH was upregulated (128.57%) as COX-2 was suppressed by small interfering RNA and downregulated (51.72%) as COX-2 was enhanced by COX-2 cDNA transfection in gastric cancer cells. In tissue specimens with gastric cancer, there was a decreased expression of 15-PGDH and an increased expression of COX-2 simultaneously. A significantly negative correlation of 15-PGDH expression was found to COX-2 level, tumor differentiation, tumor, lymph node, metastasis (TNM) staging and lymph node metastasis of gastric cancer. All the results suggest that 15-PGDH is downregulated by COX-2 in human gastric cancer and may contribute to the carcinogenesis and development of human gastric cancer in combination with COX-2.

Journal Article.  5797 words.  Illustrated.

Subjects: Clinical Cytogenetics and Molecular Genetics

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