Mechanistic Aspects of COX-2 Expression in Colorectal Neoplasia
Abstract
The cyclooxygenase-2 (COX-2) enzyme catalyzes the rate-limiting step of prostaglandin formation in pathogenic states and a large amount of evidence has demonstrated constitutive COX-2 expression to be a contributing factor promoting colorectal cancer (CRC). Various genetic, epigenetic, and inflammatory pathways have been identified to be involved in the etiology and development of CRC. Alteration in these pathways can influence COX-2 expression at multiple stages of colon carcinogenesis allowing for elevated prostanoid biosynthesis to occur in the tumor microenvironment. In normal cells, COX-2 expression levels are potently regulated at the post-transcriptional level through various RNA sequence elements present within the mRNA 3′ untranslated region (3′UTR). A conserved AU-rich element (ARE) functions to target COX-2 mRNA for rapid decay and translational inhibition through association with various RNA-binding proteins to influence the fate of COX-2 mRNA. Specific microRNAs (miRNAs) bind regions within the COX-2 3′UTR and control COX-2 expression. In this chapter, we discuss novel insights in the mechanisms of altered post-transcriptional regulation of COX-2 in CRC and how this knowledge may be used to develop novel strategies for cancer prevention and treatment.
Keywords
Adenomatous Polyposis Coli Lynch Syndrome Colon Tumorigenesis T8473C Single Nucleotide Polymorphism Cytoplasmic Stress GranuleAbbreviations
- CRC
Colorectal cancer
- CV
Cardiovascular
- CIN
Chromosomal instability
- APC
Adenomatous polyposis coli
- FAP
Familial adenomatous polyposis
- EGF
Epidermal growth factor
- TGF
Transforming growth factor
- COX
Cyclooxygenase
- PG
Prostaglandin
- (TX)A2
Thromboxane
- PGI2
Prostacyclin
- GI
Gastrointestinal
- NSAIDs
Nonsteroidal anti-inflammatory drugs
- mPGES
Microsomal Prostaglandin E Synthase
- 15-PGDH
15-hydroxyprostaglandin dehydrogenase
- PPAR
Peroxisome proliferator-activated receptor
- AU
Rich elements (AREs)
- miRNAs
MicroRNAs
- HuR
Hu antigen R
- TIA-1
T cell intracellular antigen 1
- RBM3
RNA-binding motif protein 3
Notes
Acknowledgments
This work was supported by the National Institutes of Health (R01 CA134609 to D.A. Dixon) and American Cancer Society (RSG-06-122-01-CNE to D.A. Dixon). We apologize to our colleagues for not being able to reference all primary work due to space limitations.
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