Journal Article

Benzo[a]pyrene up-regulates cyclooxygenase-2 gene expression in oral epithelial cells.

D J Kelley, J R Mestre, K Subbaramaiah, P G Sacks, S P Schantz, T Tanabe, H Inoue, J T Ramonetti and A J Dannenberg

in Carcinogenesis

Volume 18, issue 4, pages 795-799
Published in print April 1997 | ISSN: 0143-3334
Published online April 1997 | e-ISSN: 1460-2180 | DOI: http://dx.doi.org/10.1093/carcin/18.4.795
Benzo[a]pyrene up-regulates cyclooxygenase-2 gene expression in oral epithelial cells.

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Cyclooxygenase may be important in the pathogenesis of smoking-related cancer because it activates carcinogens and catalyzes prostaglandin biosynthesis. We determined the effects of benzo[a]pyrene (B[a]P), a polycyclic aromatic hydrocarbon in tobacco smoke, on cyclooxygenase-2 (Cox-2) mRNA, protein and synthesis of prostaglandin E2 (PGE2) in normal and transformed oral epithelial cells. Treatment with B[a]P caused a dose-dependent increase in production of PGE2, with a maximal increase of approximately 100%. Enhanced synthesis of PGE2 was associated with increased amounts of Cox-2 protein. B[a]P also caused a two-fold increase in Cox-2 mRNA in both normal and transformed cells. Transient transfections with a Cox-2 promoter construct showed that B[a]P-mediated induction of Cox-2 mRNA reflected increased transcription. Levels of Cox-1 were unaffected by B[a]P. B[e]P did not affect the synthesis of PGE2 or amounts of Cox-2. These data are important because B[a]P-mediated induction of Cox-2 may predispose to carcinogenesis by enhancing the production of mutagens and the synthesis of prostaglandins.

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Subjects: Clinical Cytogenetics and Molecular Genetics

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