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Activation and repression of growth factor receptor gene transcription (Review)
1Department of Cell Biology and Anatomy, Chicago Medical School, North Chicago, IL 60064, USA. dimarioj@finchcms.edu
Abstract:
Growth factor receptors mediate cell signaling events that regulate a diverse array of cellular activities including cell proliferation, homeostasis, and differentiation of both normal and cancer cells. Studies of the mechanisms governing transcription of growth factor receptor genes have revealed common structural features of their promoters. These common features include GC rich promoter regions and multiple Sp factor binding sites based upon which most of these promoters are transactivated. Mechanisms of growth factor receptor promoter activation via these common structural features will be reviewed, with particular attention to control of FGFR1 promoter activity in skeletal muscle cells. Of equal importance in cellular function is the repression of growth factor receptor signaling and gene expression. Mechanisms that repress growth factor receptor promoter activity operate via direct repression at transcriptional activator binding sites and via protein-protein interactions that abrogate activator function. Mechanisms of growth factor receptor transcriptional repression will be considered in the context of known tumor suppressors, transcription activator availability, as well as in light of emerging potential Sp1-like transcriptional repressors.
Insights
Growth factor receptor gene transcription is activated by GC-rich promoters with Sp factor binding sites. Repression mechanisms involve tumor suppressors and Sp1-like repressors, crucial for normal and cancer cell regulation.
Area of Science:
- Molecular Biology
- Cellular Signaling
- Gene Regulation
Background:
- Growth factor receptors are key mediators of cellular activities like proliferation, homeostasis, and differentiation in normal and cancerous cells.
- Their gene transcription is governed by common promoter structural features, including GC-rich regions and multiple Sp factor binding sites.
Purpose of the Study:
- To review mechanisms of growth factor receptor promoter activation, focusing on FGFR1 in skeletal muscle cells.
- To examine mechanisms of growth factor receptor signaling and gene expression repression.
Main Methods:
- Analysis of common structural features in growth factor receptor gene promoters.
- Review of transcriptional activation and repression mechanisms.
- Focus on FGFR1 promoter activity control in skeletal muscle cells.
Main Results:
- Growth factor receptor promoters are typically GC-rich and transactivated via Sp factor binding sites.
- Repression mechanisms include direct binding site interference and protein-protein interactions that inhibit activator function.
- Tumor suppressors and Sp1-like repressors play roles in repressing growth factor receptor transcription.
Conclusions:
- Understanding both activation and repression mechanisms of growth factor receptor genes is vital for cellular function and cancer research.
- Targeting these regulatory pathways may offer therapeutic strategies for cancer treatment.