PHGPx overexpression induces an increase in COX-2 activity in colon carcinoma cells.
BACKGROUND: Lipid peroxidation is a constant problem that eukaryotic cells have to face. Glutathione peroxidases (GPx) are among the most effective systems that protect cells from hydroperoxide toxicity. The objective of this study was to evaluate the relationship between GPx and cyclooxygenase 2 ( COX-2), implicated in cancer pathogenesis, particularly in colon cancer cells. MATERIALS AND METHODS: Phospholipid hydroperoxide glutathione peroxidase (PHGPx or GPx4), which metabolizes peroxidized phospholipids, was cloned in an expression plasmid, transfected in HT29 cl.19A colon carcinoma cells and the effects of PHGPx overexpression were measured on arachidonic acid metabolism by COX-2. Metabolites were studied by HPLC and EIA; COX-2 mRNA levels were analysed rising semi-quantitative PCR. RESULTS: Prostaglandins (PGE2, PGF2alpha, 6 keto-PGF1alpha) and thromboxane (TXB2) production were increased. COX-2 mRNA levels increased in PHGPx overexpressing cells. CONCLUSION: Surprisingly, our data suggest that PHGPx overexpression noticeably increases COX-2 metabolism.[1]References
- PHGPx overexpression induces an increase in COX-2 activity in colon carcinoma cells. Barrière, G., Rabinovitch-Chable, H., Cook-Moreau, J., Faucher, K., Rigaud, M., Sturtz, F. Anticancer Res. (2004) [Pubmed]
Annotations and hyperlinks in this abstract are from individual authors of WikiGenes or automatically generated by the WikiGenes Data Mining Engine. The abstract is from MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.About WikiGenesOpen Access LicencePrivacy PolicyTerms of Useapsburg
