Abstract
Cyclooxygenase 2 (COX-2) is often found overexpressed in cancer and is thought to have a role in carcinogenic promotion and thus is a target for therapeutic intervention. Here, we investigated the regulation of COX-2 expression in normal and cancer ovarian surface epithelial cells. Tumor necrosis factor alpha (TNF-α) is a potent inducer of COX-2 expression in the ovarian surface epithelium and this regulation is a critical step in ovulation. We observed that TNF-α stimulated COX-2 expression in human primary and immortalized epithelial (HIO) cell lines. The stimulation was suppressed by inhibitors of several signaling pathways, indicating the collaboration of TNF-α-activated signaling pathways mediates the regulation of COX-2 expression. In five ovarian cancer cell lines analysed, four did not express detectable COX-2 and TNF-α failed to elicit COX-2 expression. In NIH:OVCAR-5, the only ovarian cancer cell line expressing COX-2, signal pathway inhibitors no longer affected TNF-α-induced COX-2 expression. Thus, we conclude that TNF-α mediated signaling is uncoupled from the modulation of COX-2 expression in ovarian cancer. The loss of COX-2 expression was also observed to associate closely with epithelial neoplastic morphological transformation. The frequent loss of COX-2 expression suggests in ovarian cancer, unlike in other epithelial cancers, COX-2 expression does not contribute to ovarian cancer malignancy.
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Abbreviations
- COX:
-
cyclooxygenase
- FBS:
-
fetal bovine serum
- FSH:
-
follicle stimulating hormone
- HIO cells:
-
human ‘immortalized’ ovarian surface epithelial cells
- IL-1β:
-
interleukin 1-beta
- JNK:
-
Jun N-terminal kinase
- LH:
-
luteinizing hormone
- MAPK (ERK):
-
mitogen-activated protein kinase extracellular-signal regulated kinase
- OSE:
-
ovarian surface epithelial
- PGH2:
-
prostaglandin H2
- TNF-α:
-
tumor necrosis factor alpha
- TNFR:
-
TNF-α receptor
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Acknowledgements
We appreciate Dr Elizabeth Smith for reading, proofing and commenting during the process of preparing the manuscript. We have been greatly assisted by the Histopathology Core (Core B of FCCC Ovarian SPORE) in tissue analysis. We thank Malgorzata Rula, Jennifer Smedberg and Cory Staub for their technical assistance and Ms Patricia Bateman for her excellent secretarial support. This work was supported by Grants R01 CA79716 and R01 CA75389 to XX Xu from NCI, NIH and funds from Ovarian Cancer SPORE P50 CA83638 (RF Ozols, PI). The work was also supported by an appropriation from the Commonwealth of Pennsylvania.
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During the review of the manuscript, a recent paper by Gubbay et al (Inflammation-associated gene expression is altered between normal human ovarian surface epithelial cells and cell lines derived from ovarian adenocarcinomas. Br. J. Cancer, 2005 May 23; 92: 1927–1933.) was published. They conclude that ovarian cancer cells fail to responsd to IL-1α stimulation for COX-2 induction. The finding is complementary to the conclusion of the current study, suggesting the association of loss of cytokine responsive activity with neoplastic transformation in ovarian epithelial cells.
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Yang, WL., Roland, I., Godwin, A. et al. Loss of TNF-α-regulated COX-2 expression in ovarian cancer cells. Oncogene 24, 7991–8002 (2005). https://doi.org/10.1038/sj.onc.1208943
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DOI: https://doi.org/10.1038/sj.onc.1208943