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MMP and TIMP gene expression in head and neck squamous cell carcinomas and adjacent tissues
B Birkedal-Hansen1, Z P Pavelic, J L Gluckman
1Matrix Extracellular Pathology Section, Laboratory of Pathology, DCS, NCI, NIH, Bethesda, MD 20892, USA. bentebh@helix.nih.gov
Objective:
To compare the frequency of gene expression of matrix metalloproteinases (MMP) stromelysins -1, -2 and -3 (MMP-3, -10, and -11), matrilysin (MMP-7), MTI-MMP (MMP-14), and of TIMPs (Tissue Inhibitors of MMPs) -1, -2, -3 and -4 in head and neck squamous cell carcinomas with those of matched adjacent normal tissues.
Materials And Methods:
The present study included 20 surgically removed head and neck squamous cell carcinomas, seven of which were accompanied by matched adjacent oral mucosa excised from the border of the specimens outside the tumor area. RNA isolated from tumors and control samples was subjected to RT-PCR using primers specific for MMP-3, -7, -10, -11 and -14 and for TIMPs -1, -2, -3, and -4.
Results:
Our findings demonstrate that each of the five MMP genes studied were expressed in essentially all the tumors, while the adjacent marginal tissue samples showed a more varied picture: while stromelysin-3 was located to a majority of the marginal samples, matrilysin was expressed in four of seven adjacent samples, stromelysin-1 and MTI-MMP genes were each expressed in three of these samples, and stromelysin-2 transcript was only expressed in two marginal tissue samples. Whereas TIMP-1 and TIMP-2 transcripts were identified in all tumor and adjacent tissue samples studied, TIMP-3 was expressed, albeit often at low levels, in 17 of 20 tumor samples but only in three of seven adjacent tissues. The novel TIMP-4 gene was not expressed at all.
Conclusions:
Specific MMP (MMP-3, -7, -10, -14) and TIMP-3 transcripts observed in head and neck squamous cell carcinomas compared to their frequency in specimens of matching tissues provide important information about expression of extracellular matrix degrading enzymes and their tissue inhibitors in head and neck carcinomas.
Insights
Gene expression of matrix metalloproteinases (MMPs) and tissue inhibitors of MMPs (TIMPs) was analyzed in head and neck squamous cell carcinomas. MMPs and TIMP-3 showed distinct expression patterns in tumors versus adjacent tissues, offering insights into head and neck cancer.
Area of Science:
- Oncology
- Molecular Biology
- Biochemistry
Background:
- Head and neck squamous cell carcinomas (HNSCC) involve complex molecular alterations.
- Matrix metalloproteinases (MMPs) and their inhibitors (TIMPs) play crucial roles in extracellular matrix remodeling and cancer progression.
- Understanding the differential expression of MMPs and TIMPs in HNSCC is vital for identifying potential therapeutic targets.
Purpose of the Study:
- To compare the gene expression frequency of specific MMPs (MMP-3, -7, -10, -11, -14) and TIMPs (-1, -2, -3, -4) in HNSCC tissues versus matched adjacent normal tissues.
- To investigate the differential expression patterns of these key enzymes and inhibitors in the context of HNSCC.
Main Methods:
- The study analyzed 20 surgically resected HNSCC samples and seven matched adjacent oral mucosa samples.
- RNA was extracted from both tumor and control tissues.
- Reverse transcription-polymerase chain reaction (RT-PCR) was employed to quantify the expression of target MMP and TIMP genes.
Main Results:
- All five studied MMP genes were expressed in nearly all tumor samples.
- TIMP-1 and TIMP-2 were ubiquitously expressed in both tumor and adjacent tissues.
- TIMP-3 showed significantly higher expression in tumors compared to adjacent tissues, while TIMP-4 was not detected.
Conclusions:
- Specific MMPs (MMP-3, -7, -10, -14) and TIMP-3 exhibit distinct expression frequencies in HNSCC compared to adjacent tissues.
- These findings highlight the altered expression of extracellular matrix-degrading enzymes and their inhibitors in HNSCC.
- The differential expression provides valuable information for understanding HNSCC pathogenesis and potential therapeutic strategies.
