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Identification of 9 genes differentially expressed in head and neck squamous cell carcinoma
Hernan E Gonzalez1, Manu Gujrati, Mitchell Frederick
1Department of Head and Neck Surgery, University of Texas M. D. Anderson Cancer Center, Houston, 77030, USA.
Background:
Current treatment modalities in squamous cell carcinoma of the head and neck have failed to improve survival. Advances in the discovery of novel biomarkers and targets for therapy are necessary.
Design:
Differential display and microarray analysis were used to identify differences in gene expression between squamous carcinoma and matched nonmalignant biopsy specimens. Differences in gene expression found in vivo were also tested in vitro by comparing primary cultured normal oral epithelium with head and neck squamous cell carcinoma (HNSCC) cell lines. Results were confirmed by relative reverse transcriptase-polymerase chain reaction and immunohistochemical analysis.
Results:
In tumors, microarray analysis showed down-regulation of calgranulin B (CAGB), CD24, lymphoepithelial Kazal-type-related inhibitor (LEKTI), zinc finger protein (ZNF-185), transglutaminase-3 (TGM3), and the ETS homologous factor (EHF). In addition, differential display revealed down-regulation of headpin. In contrast, periostin and the human homologue of the Drosophila white gene (ABCG1) were found to be up-regulated by microarray analysis and differential display, respectively. In HNSCC cell lines, LEKTI, ZNF-185, TGM3, headpin, and ABCG1 showed an expression pattern similar to that observed in tumor specimens. Periostin showed an opposite expression pattern in cell lines compared with that of tumor specimens. No consistent pattern of expression was found for CAGB, CD24, and EHF in cell lines. Immunohistochemical analysis revealed that the expression of headpin in nonmalignant mucosa was undetectable in tumors.
Conclusion:
Using differential display and microarray analysis, we have identified and confirmed the differential expression of 9 genes in HNSCC. Work is in progress to determine the biological significance of these genes and their potential as biomarkers or targets for therapy.
Insights
Researchers identified 9 differentially expressed genes in head and neck squamous cell carcinoma (HNSCC) using gene expression analysis. These genes may serve as novel biomarkers or therapeutic targets for HNSCC treatment.
Area of Science:
- Oncology
- Molecular Biology
- Genomics
Background:
- Current treatments for head and neck squamous cell carcinoma (HNSCC) have not improved patient survival rates.
- There is a critical need for novel biomarkers and therapeutic targets in HNSCC research.
Purpose of the Study:
- To identify differentially expressed genes in HNSCC compared to nonmalignant tissues.
- To explore the potential of these genes as biomarkers or therapeutic targets for HNSCC.
Main Methods:
- Utilized differential display and microarray analysis to compare gene expression in HNSCC tumors and matched nonmalignant specimens.
- Validated findings in vitro using HNSCC cell lines and normal oral epithelium.
- Confirmed gene expression patterns through relative reverse transcriptase-polymerase chain reaction and immunohistochemical analysis.
Main Results:
- Identified down-regulation of calgranulin B, CD24, LEKTI, ZNF-185, TGM3, EHF, and headpin in HNSCC tumors.
- Observed up-regulation of periostin and ABCG1 in HNSCC tumors.
- Confirmed differential expression of LEKTI, ZNF-185, TGM3, headpin, and ABCG1 in HNSCC cell lines, with periostin showing an inverse pattern.
Conclusions:
- Differential display and microarray analysis successfully identified 9 genes with altered expression in HNSCC.
- Further research is ongoing to elucidate the biological significance of these genes and their potential clinical applications as biomarkers or therapeutic targets.