期刊
JOURNAL OF UROLOGY
卷 181, 期 3, 页码 1347-1352出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.juro.2008.10.140
关键词
kidney; Wilms tumor; cyclooxygenase 2; S1PR2 protein, human; sphingosine 1-phosphate
资金
- Seraph Foundation (IFF)
- National Institutes of Health [kD8DK070468A, GM15431, DK48831, ES13125]
Purpose: Cyclooxygenase-2 has been reported to be ubiquitously expressed in Wilms tumor, the most common malignant renal tumor in children. However, to our knowledge the regulation mechanism of cyclooxygenase-2 expression remains unexplored. Materials and Methods: Quantitative real-time polymerase chain reaction and Western blot were performed to detect cyclooxygenase-2 mRNA and protein expression in WiT49 cells upon stimulation by SIP (Biomol (R)), and S1P(2) and cyclooxygenase-2 mRNA expression in 10 freshly frozen Wilms tumor tissues and matched normal tissues. Over expression, blockade and down-regulation of S1P(2) were determined using adenoviral transduction, the S1P(2) antagonist JTE-013 (Tocris Bioscience, Ellisville, Missouri) and small interfering RNA (Dharmacon, Lafayette, Colorado) transfection, respectively. The prostaglandin E-2 level in WiT49 cells was determined by gas chromatography/mass spectrometry. Results: S1P induced cyclooxygenase-2 mRNA and protein expression in WiT49 cells in a concentration dependent manner. Over expression of S1P(2) in WiT49 cells led to a significant increase in cyclooxygenase-2 mRNA and protein expression as well as subsequent prostaglandin E2 synthesis. In addition, pretreatment of those cells that over expressed S1P(2) with the S1P(2) selective antagonist JTE-013 completely blocked SIP induced cyclooxygenase-2 protein expression. In accordance with these results silencing S1P(2) in WiT49 cells down-regulated SIP induced cyclooxygenase-2 expression. Further research in 10 Wilms tumor specimens showed that S1P(2) mRNA is greatly increased in Wilms tumor. Conclusions: SIP induced cyclooxygenase-2 expression in Wilms tumor and this effect was mediated by S1P(2). This finding extends the biological function of S1P(2) and provides the biochemical basis for developing inhibitors targeting the S1P/cyclooxygenase-2 signaling pathway.
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