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Background and Objectives:It is well known that Prostaglandin E2 (PGE2) is the most predominant prostaglandin in squa-mous cell carcinoma and that PGE2 synthesis is suppressed by retinoid. The purpose of this study was to confirm whether N- (4- Hydroxyphenyl) retinamide (N- 4- HPR) suppresed PGE2 synthesis, and investigate its inhibitory mechanism on PGE2 synthesis in squamous cell carcinoma. Materials and Method=MDA 886Ln was used as the squamous cell carcinoma cell line. We evaluated the efects of four retinoids (all- trans- RA, 13- cis- RA, retinyl acetate, and N- 4- HPR) on PGE2 synthesis:the effect of N- 4- HPR concentration on PGE2 synthesis and Cox- 2 mRNA, the effect of N- 4- HPR on Cox- 2 protein, and the effect of N- 4- HPR on the cyclooxygenase activity. Results:Among the four retinoids, N- 4- suppresor of PGE2 synthesis. N- 4- HPR suppressed PGE2 synthesis, but N- 4- HPR did not suppres Cox- 2 mRNA or Cox- 2 protein. Cyclooxygenase activity was suppressed by N- 4- HPR. Conclusion:With these results, we sugest that the inhibitory mechanism of N- 4- HPR on the PGE2 synthesis may be suppresion of the cyclooxygenase activity, and Cox- 2 mRNA and protein were not suppressed by N- 4- HPR. (Korean J Otolaryngol 203 ;46 :496-501)

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