Abstract
The immediate early gene cyclooxygenase-2 (Cox-2), which encodes the inducible prostaglandin synthase enzyme, is regulated at the level of post-transcriptional mRNA turnover. In this study, the functional role of the 3'-untranslated region (3'-UTR) of the human Cox-2 gene was characterized. Deletion of the distal region of the 3'-UTR strongly inhibited basal mRNA turnover, suggesting that this region contains mRNA instability determinants. However, deletion of the proximal highly-conserved region (CR1: 6082-6198) resulted in increased basal turnover, indicating that it determines mRNA stability. All of the 3'-UTR constructs conferred IL-1-induced stabilization but not dexamethasone-induced down-regulation. Thus, distinct regions of the 3'-UTR of the Cox-2 transcript are involved in the regulation of basal and cytokine-induced mRNA metabolism.
Publication types
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Research Support, U.S. Gov't, P.H.S.
MeSH terms
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Cells, Cultured
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Conserved Sequence / genetics
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Cyclooxygenase 2
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Cytokines / pharmacology*
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Dactinomycin / pharmacology
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Dexamethasone / pharmacology
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Electrophoresis, Polyacrylamide Gel
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Gene Expression / genetics
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Genes, Reporter / genetics
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Humans
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Interleukin-1 / pharmacology
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Isoenzymes / genetics*
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Luciferases / genetics
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Luciferases / metabolism
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Membrane Proteins
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Mutagenesis / genetics*
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Prostaglandin-Endoperoxide Synthases / genetics*
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RNA, Messenger / drug effects
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RNA, Messenger / genetics
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RNA, Messenger / metabolism*
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Sequence Deletion / genetics
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Transcription, Genetic / drug effects
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Transfection / genetics
Substances
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Cytokines
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Interleukin-1
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Isoenzymes
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Membrane Proteins
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RNA, Messenger
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Dactinomycin
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Dexamethasone
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Luciferases
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Cyclooxygenase 2
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PTGS2 protein, human
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Prostaglandin-Endoperoxide Synthases