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J Biol Chem, Vol. 275, Issue 16, 11750-11757, April 21, 2000

Post-transcriptional Control of Cyclooxygenase-2 Gene Expression
THE ROLE OF THE 3'-UNTRANSLATED REGION*

Dan A. DixonDagger §, Craig D. Kaplan, Thomas M. McIntyre, Guy A. Zimmerman, and Stephen M. PrescottDagger §

From the Dagger  Department of Oncological Sciences, Eccles Program in Human Molecular Biology and Genetics, and the Huntsman Cancer Institute, University of Utah, Salt Lake City, Utah 84112

The cyclooxygenase (COX)-2 enzyme is responsible for increased prostaglandin formation in inflammatory states and is the major target of nonsteroidal anti-inflammatory drugs. Normally COX-2 expression is tightly regulated, however, constitutive overexpression plays a key role in colon carcinogenesis. To understand the mechanisms controlling COX-2 expression, we examined the ability of the 3'-untranslated region of the COX-2 mRNA to regulate post-transcriptional events. When fused to a reporter gene, the 3'-untranslated region mediated rapid mRNA decay (t1/2 = 30 min), which was comparable to endogenous COX-2 mRNA turnover in serum-induced fibroblasts treated with actinomycin D or dexamethasone. Deletion analysis demonstrated that a conserved 116-nucleotide AU-rich sequence element (ARE) mediated mRNA degradation. In transiently transfected cells, this region inhibited protein synthesis approximately 3-fold. However, this inhibition did not occur through changes in mRNA stability since mRNA half-life and steady-state mRNA levels were unchanged. RNA mobility shift assays demonstrated a complex of cytoplasmic proteins that bound specifically to the ARE, and UV cross-linking studies identified proteins ranging from 90 to 35 kDa. Fractionation of the cytosol showed differential association of ARE-binding proteins to polysomes and S130 fractions. We propose that these factors influence expression at a post-transcriptional step and, if dysregulated, may increase COX-2 protein as detected in colon cancer.


* This work was supported by American Heart Association Scientist Development Grant 9930102N (to D. A. D.) and National Institutes of Health (NCI) Grant CA73992. The core facilities at the Huntsman Cancer Institute (DNA sequencing and DNA/peptide synthesis) are supported by Cancer Center Support Grant CA42014 from the National Institutes of Health (NCI).The costs of publication of this article were defrayed in part by the payment of page charges. The article must therefore be hereby marked "advertisement" in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.

§ To whom correspondence should be addressed: Huntsman Cancer Institute, University of Utah, 2000 Circle of Hope, Salt Lake City, UT 84112. Tel.: 801-585-3401; Fax: 801-585-6345; E-mail: dan.dixon@hci.utah.edu or steve.prescott@hci.utah.edu.

Present address: Dept. of Genetics, Harvard Medical School, Boston, MA 02115.


Copyright © 2000 by The American Society for Biochemistry and Molecular Biology, Inc.
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