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Regulation of the MAD1 promoter by G-CSF
Kan Jiang1, Nadine Hein, Kolja Eckert
1Institut für Biochemie, Universitätsklinikum, RWTH Aachen University, Pauwelsstrasse 30, 52057 Aachen, Germany.
Abstract:
MAD family proteins are transcriptional repressors that antagonize the functions of MYC oncoproteins. In particular, MAD1 has been demonstrated to interfere with MYC-induced proliferation, transformation and apoptosis. The MAD1 gene is expressed in distinct patterns, mainly associated with differentiation and quiescence. We observed that MAD1 is directly activated by G-CSF in promyelocytic cell lines. To investigate the transcriptional regulation of the human MAD1 gene, we have cloned and characterized its promoter. A region of high homology between the MAD1 orthologs of human, mouse and rat contains the core promoter, marked by open chromatin, high GC content and the lack of a TATA box. Using deletion constructs we identified two CCAAT-boxes occupied by C/EBPalpha and beta in the homology region that mediate responsiveness to G-CSF receptor signaling. The necessary signals include the activation of STAT3 and the RAS/RAF/ERK pathway. STAT3 does not bind directly to promoter DNA, but is recruited by C/EBPbeta. In summary, our studies provide a first analysis of the MAD1 promoter and suggest STAT3 functions as a C/EBPbeta cofactor in the regulation of the MAD1 gene. Our findings provide the base for the characterization of additional signal transduction pathways that control the expression of MAD1.
Insights
This study characterizes the human MAD1 gene promoter, revealing that C/EBPalpha and C/EBPbeta binding sites mediate G-CSF receptor signaling. STAT3 acts as a cofactor with C/EBPbeta to regulate MAD1 expression.
Area of Science:
- Molecular Biology
- Gene Regulation
- Cancer Biology
Background:
- MAD family proteins, like MAD1, are transcriptional repressors that counteract MYC oncoprotein functions.
- MAD1 plays a role in cell differentiation and quiescence, and its expression is induced by G-CSF in promyelocytic cell lines.
Purpose of the Study:
- To investigate the transcriptional regulation of the human MAD1 gene.
- To identify the core promoter region and regulatory elements involved in G-CSF-mediated activation.
Main Methods:
- Cloning and characterization of the human MAD1 promoter using deletion constructs.
- Analysis of transcription factor binding sites (CCAAT-boxes) and their role in signaling pathways.
- Investigation of the involvement of STAT3, C/EBPalpha, C/EBPbeta, and RAS/RAF/ERK pathways.
Main Results:
- Identified a conserved core promoter region with high GC content and lacking a TATA box.
- Discovered two CCAAT-boxes critical for G-CSF receptor signaling responsiveness.
- Demonstrated that STAT3 is recruited by C/EBPbeta to the promoter, rather than binding directly.
Conclusions:
- The study provides the first analysis of the human MAD1 promoter.
- STAT3 acts as a cofactor with C/EBPbeta in regulating MAD1 gene expression.
- These findings lay the groundwork for exploring additional signaling pathways controlling MAD1 expression.
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