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Published on: July 25, 2011
KLF4, Slug and EMT in Head and Neck Squamous Cell Carcinoma
Julia Ingruber1, Dragana Savic2,3, Teresa Bernadette Steinbichler1
1Department of Otorhinolaryngology and Head and Neck Surgery, Medical University of Innsbruck, University Hospital of Tyrol, A-6020 Innsbruck, Austria.
Abstract:
Epithelial to mesenchymal transition (EMT) is clinically relevant in head and neck squamous cell carcinoma (HNSCC). We hypothesized that EMT-transcription factors (EMT-TFs) and an anti-EMT factor, Krüppel-like-factor-4 (KLF4) regulate EMT in HNSCC. Ten control mucosa and 37 HNSCC tissue samples and three HNSCC cell lines were included for investigation of EMT-TFs, KLF4 and vimentin at mRNA and protein levels. Slug gene expression was significantly higher, whereas, KLF4 gene expression was significantly lower in HNSCC than in normal mucosa. In the majority of HNSCC samples, there was a significant negative correlation between KLF4 and Slug gene expression. Slug gene expression was significantly higher in human papilloma virus (HPV) negative HNSCC, and in tumor samples with irregular p53 gene sequence. Transforming-growth-factor-beta-1 (TGF- β1) contributed to downregulation of KLF4 and upregulation of Slug. Two possible regulatory pathways could be suggested: (1) EMT-factors induced pathway, where TGF-β1 induced Slug together with vimentin, and KLF4 was down regulated at the same time; (2) p53 mutations contributed to upregulation and stabilization of Slug, where also KLF4 could co-exist with EMT-TFs.
Insights
In head and neck squamous cell carcinoma (HNSCC), epithelial to mesenchymal transition (EMT) involves decreased Krüppel-like factor 4 (KLF4) and increased Slug. Transforming growth factor-beta-1 and p53 mutations influence these EMT regulators.
Area of Science:
- Oncology
- Molecular Biology
- Cancer Research
Background:
- Epithelial to mesenchymal transition (EMT) is a critical process in cancer progression, particularly in head and neck squamous cell carcinoma (HNSCC).
- EMT involves the downregulation of epithelial markers and upregulation of mesenchymal markers, contributing to tumor invasion and metastasis.
- Krüppel-like factor 4 (KLF4) is recognized as an anti-EMT factor, while EMT-transcription factors (EMT-TFs) like Slug promote EMT.
Purpose of the Study:
- To investigate the roles of EMT-TFs and KLF4 in regulating EMT in HNSCC.
- To explore the relationship between KLF4, EMT-TFs (specifically Slug), and clinical parameters in HNSCC.
- To elucidate potential molecular pathways involving transforming growth factor-beta-1 (TGF-β1) and p53 in HNSCC-associated EMT.
Main Methods:
- Analysis of EMT-TFs, KLF4, and vimentin mRNA and protein expression in HNSCC tissues and cell lines.
- Comparison of gene expression between HNSCC samples and normal mucosa.
- Correlation analysis between KLF4, Slug, human papilloma virus (HPV) status, and p53 gene sequence irregularities.
Main Results:
- Slug gene expression was significantly elevated, while KLF4 gene expression was significantly reduced in HNSCC compared to normal mucosa.
- A significant inverse correlation was observed between KLF4 and Slug gene expression in most HNSCC samples.
- Slug expression was higher in HPV-negative HNSCC and tumors with irregular p53 sequences; TGF-β1 promoted KLF4 downregulation and Slug upregulation.
Conclusions:
- KLF4 downregulation and Slug upregulation are key features of EMT in HNSCC.
- TGF-β1 signaling and p53 mutations represent potential pathways driving EMT in HNSCC by modulating KLF4 and Slug.
- These findings highlight KLF4 and Slug as potential therapeutic targets for HNSCC treatment.
