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Multiple cis- and trans-acting elements mediate the transcriptional response to phorbol esters
1Department of Pharmacology, School of Medicine, University of California, San Diego, La Jolla 92093.
Nature
|October 15, 1987
Summary
This study identifies four distinct TPA-responsive elements within the simian virus 40 enhancer, crucial for understanding protein kinase C signaling pathways and gene transcription regulation.
Area of Science:
- Molecular Biology
- Cell Signaling
- Gene Regulation
Background:
- Protein kinase C (PKC) is a key enzyme in signal transduction, activated by diacylglycerols and phorbol esters like 12-O-tetradecanoyl-phorbol-14 acetate (TPA).
- While PKC substrates are known, the specific proteins controlling transcription after PKC activation remain unidentified.
- TPA treatment induces various genes, including proto-oncogenes and growth factors, and enhances viral enhancer activity.
Purpose of the Study:
- To identify trans-acting factors mediating transcriptional responses to TPA.
- To investigate the role of the simian virus 40 (SV40) enhancer in TPA-induced gene regulation.
Main Methods:
- Utilized the SV40 enhancer as a model system due to its well-defined cis-acting elements and multiple trans-acting factors.
- Analyzed TPA responsiveness of different elements within the SV40 enhancer.
Main Results:
- Identified at least four distinct TPA-responsive elements within the SV40 enhancer.
- Demonstrated that the activity of these elements is cell-type dependent.
- Indicated that the TPA induction response involves at least two post-translational modifications of relevant proteins.
Conclusions:
- The SV40 enhancer contains multiple TPA-responsive elements critical for mediating transcriptional changes.
- Cell-type specificity and post-translational modifications play significant roles in PKC-mediated gene regulation.