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Updated: May 30, 2026
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Vasodilation of Isolated Vessels and the Isolation of the Extracellular Matrix of Tight-skin Mice
Published on: March 24, 2017
Developmental factor IRF6 exhibits tumor suppressor activity in squamous cell carcinomas
Elisabetta Botti1, Giulia Spallone, Francesca Moretti
1Department of Dermatology, University of Rome Tor Vergata, 00133 Rome, Italy.
Summary
Interferon regulatory factor 6 (IRF6) suppresses skin cancer by regulating cell growth and differentiation. Its down-regulation in squamous cell carcinomas promotes tumor invasion and progression.
Area of Science:
- Dermatology
- Molecular Biology
- Cancer Research
Background:
- Interferon regulatory factor 6 (IRF6) is crucial for craniofacial development and epidermal proliferation.
- IRF6 forms a feedback loop with p63, controlling keratinocyte proliferation.
- IRF6's role in skin carcinogenesis was previously unexplored.
Purpose of the Study:
- To investigate the involvement of IRF6 in skin carcinogenesis.
- To elucidate the molecular mechanisms underlying IRF6's tumor suppressive activity in stratified epithelia.
Main Methods:
- Analysis of IRF6 expression in squamous cell carcinomas (SCCs).
- Assessment of IRF6 promoter methylation in SCCs.
- Genome-wide analysis combining ChIP sequencing and gene expression profiling.
- In vitro invasion assays and cell growth inhibition studies.
Main Results:
- IRF6 is significantly down-regulated in SCCs, correlating with tumor invasiveness and differentiation status.
- IRF6 down-regulation in SCCs is associated with promoter methylation.
- IRF6 depletion dysregulates cell cycle, differentiation, and cell adhesion genes, many being direct IRF6 targets.
- Loss of IRF6 promotes SCC cell invasion and growth, while its reintroduction inhibits these processes.
Conclusions:
- IRF6 functions as a tumor suppressor in stratified epithelia.
- IRF6 down-regulation contributes to skin carcinogenesis by promoting SCC invasion and proliferation.
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