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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Cyclooxygenase 1 and 2 mRNA and protein expression in the Gallus domesticus model of ovarian cancer.

OBJECTIVE.: Our purpose was to determine the mRNA and protein expression of cyclooxygenase 1 ( COX-1) and cyclooxygenase 2 ( COX-2) in ovarian tumors and normal ovaries of the hen, which is an excellent model for human ovarian cancer. Tissue concentrations of prostaglandin E(2) (PGE(2)) and PGE(2) metabolites were also determined. METHODS.: Tissue was obtained from ovarian tumor (n = 18) and normal ovary (n = 29) of 2- to 4-year old Single-comb White Leghorn hens. Quantitative real-time PCR with Sybr Green was used to quantify the mRNA expression of COX-1 and COX-2, using 18S expression as an internal control for COX normalization. Immunohistochemistry using antibodies for COX-1 and COX-2 was used to localize protein expression of each isoform in a subset of tumor (n = 5) and normal samples (n = 6). For determination of tissue prostaglandin concentration, tissue was obtained from ovarian tumor (n = 8) and normal ovary (n = 8). PGE(2) and PGE(2) metabolites were measured using competitive enzyme immunoassays (EIAs). RESULTS.: Our results indicate that COX-1 mRNA expression is significantly higher (P < 0.05) in ovarian tumor samples compared to normal ovaries while there is no significant difference in expression of COX-2 between the samples. Immunohistochemistry results support this finding and show COX-1 expression only in tumor samples and COX-2 expression unchanged between normal ovary and tumor samples. PGE(2) levels are significantly higher (P < 0.05) in tumor samples compared to normal ovaries, and there is no significant difference in PGE(2) metabolite levels between the samples. CONCLUSION.: These findings may implicate COX-1 as a suitable target for the prevention or treatment of ovarian cancer.[1]


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