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Vol. 273, Issue 4, 2424-2428, January 23, 1998
Dihydroxy Bile Acids Activate the Transcription of
Cyclooxygenase-2
Fan
Zhang §,
Kotha
Subbaramaiah ¶,
Nasser
Altorki §, and
Andrew J.
Dannenberg ¶
From the ¶ Departments of Medicine and Surgery and the
§ Department of Cardiothoracic Surgery, New York
Hospital-Cornell Medical Center and the Strang Cancer
Prevention Center, New York, New York 10021
Bile acids, endogenous promoters of
gastrointestinal cancer, activate protein kinase C (PKC) and the
activator protein-1 (AP-1) transcription factor. Because other
activators of PKC and AP-1 induce cyclooxygenase-2 (COX-2), we
determined the effects of bile acids on the expression of COX-2 in
human esophageal adenocarcinoma cells. Treatment with the dihydroxy
bile acids chenodeoxycholate and deoxycholate resulted in an ~10-fold
increase in the production of prostaglandin E2
(PGE2). Enhanced synthesis of PGE2 was
associated with a marked increase in the levels of COX-2 mRNA and
protein, with maximal effects at 8-12 and 12-24 h, respectively. In
contrast, neither cholic acid nor conjugated bile acids affected the
levels of COX-2 or the synthesis of PGE2. Nuclear run-off
assays and transient transfections with a human COX-2
promoter construct showed that induction of COX-2 mRNA by
chenodeoxycholate and deoxycholate was due to increased transcription.
Bile acid-mediated induction of COX-2 was blocked by inhibitors of PKC
activity, including calphostin C and staurosporine. Treatment with bile
acid enhanced the phosphorylation of c-Jun and increased binding of
AP-1 to DNA. These data are important because dihydroxy bile
acid-mediated induction of COX-2 may explain, at least in part, the
tumor-promoting effects of bile acids.
Copyright © 1998 by The American Society for Biochemistry and Molecular Biology, Inc.

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D. Qiao, W. Chen, E. D. Stratagoules, and J. D. Martinez
Bile Acid-induced Activation of Activator Protein-1 Requires Both Extracellular Signal-regulated Kinase and Protein Kinase C Signaling
J. Biol. Chem.,
May 12, 2000;
275(20):
15090 - 15098.
[Abstract]
[Full Text]
[PDF]
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Copyright © 1998 by the American Society for Biochemistry and Molecular Biology.
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