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Gene expression in poorly differentiated papillary thyroid carcinomas.
Øystein Fluge1, Ove Bruland, Lars A Akslen
1Department of Molecular Biology, University of Bergen, and Department of Medical Genetics and Molecular Medicine, Haukeland University Hospital, Norway. oystein.fluge@uib.no
Summary
Gene expression profiling reveals distinct molecular signatures in papillary thyroid carcinoma (PTC). Aggressive PTC shows increased cell proliferation and extracellular matrix remodeling, while classic PTC exhibits altered cell polarity.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- Papillary thyroid carcinoma (PTC) is the most common type of thyroid cancer.
- Understanding the molecular differences between aggressive and differentiated PTC is crucial for targeted therapies.
Purpose of the Study:
- To investigate differential gene expression in aggressive and classic papillary thyroid carcinoma (PTC) using cDNA microarrays.
- To identify molecular markers associated with PTC progression and aggressiveness.
Main Methods:
- cDNA microarrays were employed to analyze gene expression in fresh frozen PTC specimens.
- Quantitative reverse transcriptase-polymerase chain reaction (RT-PCR), in situ hybridization, and immunohistochemistry were used for verification.
- B-Raf gene mutation analysis (V600E) was performed.
Main Results:
- Both aggressive and classic PTC showed overexpression of genes like CBP/p300 transactivator, fibronectin, and WNT7A compared to normal thyroid tissue.
- Aggressive PTC exhibited upregulation of cell proliferation genes (e.g., CDC2, CDC7) and extracellular matrix proteins (e.g., seprase, collagens).
- Classic PTC showed upregulation of tight junction genes (e.g., claudin 1, claudin 16), potentially indicating altered cell polarity.
Conclusions:
- Gene expression patterns differ significantly between aggressive and classic PTC.
- Upregulation of cell proliferation and extracellular matrix remodeling genes is characteristic of aggressive PTC.
- Altered cell polarity may play a role in dedifferentiated PTC.