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The coding sequence mediates induction of 5-lipoxygenase expression by Smads3/4
Sabine Seuter1, Bernd L Sorg, Dieter Steinhilber
1Institute of Pharmaceutical Chemistry/ZAFES, University of Frankfurt, Max-von-Laue-Str. 9, D-60438 Frankfurt, Germany.
Biochemical and Biophysical Research Communications
|August 22, 2006
Summary
Transforming growth factor-beta (TGFbeta) rapidly induces 5-lipoxygenase (5-LO) gene expression in Mono Mac 6 cells. Smad proteins are key mediators in this TGFbeta signaling pathway, influencing 5-LO gene regulation.
Area of Science:
- Molecular Biology
- Cell Signaling
Background:
- 5-Lipoxygenase (5-LO) expression is upregulated by transforming growth factor-beta (TGFbeta) and 1alpha,25-dihydroxyvitamin D(3) in Mono Mac 6 cells.
- Smad proteins are known downstream effectors of TGFbeta signaling.
Purpose of the Study:
- To investigate the role of the TGFbeta/Smad signaling system in regulating 5-LO gene expression.
- To identify regulatory elements within the 5-LO gene responsive to Smad proteins.
Main Methods:
- Real-time quantitative RT-PCR to measure 5-LO mRNA induction.
- Reporter gene assays using 5-LO promoter constructs with varying gene regions.
- Deletion studies and sequence analysis to identify Smad binding elements and TGFbeta responsive elements.
Main Results:
- 5-LO mRNA is rapidly induced by TGFbeta, suggesting it is a primary target gene.
- Smads3/4 significantly upregulate reporter activity, with dependence on the coding sequence, 3'-UTR, and introns J-M.
- Deletion of exons 10-14 most significantly reduced Smad3/4 inducibility.
- Up to four Smad binding elements and at least one TGFbeta responsive element were identified downstream of the transcriptional start site.
Conclusions:
- The TGFbeta/Smad signaling pathway plays a crucial role in the regulation of 5-LO gene expression.
- Specific regions within the 5-LO gene, including exons 10-14 and downstream elements, are critical for Smad-mediated induction.
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