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Quantitative analysis of osteonectin mRNA in thyroid carcinomas.
Toru Takano1, Yukiko Hasegawa, Akira Miyauchi
1Department of Laboratory Medicine, Osaka University Medical School, Suita, Japan.
Endocrine Journal
|October 31, 2002
Summary
Osteonectin mRNA is overexpressed in anaplastic carcinoma tissues, but not in cancer cells. This suggests stromal cells, not tumor cells, contribute to increased osteonectin in thyroid cancer.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- Thyroid carcinoma is a significant health concern.
- Osteonectin (ONN) is an extracellular matrix protein.
- Previous studies indicated potential ONN involvement in anaplastic carcinoma.
Purpose of the Study:
- To investigate the expression levels of osteonectin mRNA in thyroid carcinoma.
- To determine if osteonectin is overexpressed in anaplastic carcinoma cells or surrounding stromal cells.
Main Methods:
- Gene expression profiling of thyroid carcinoma.
- Real-time quantitative reverse-transcription PCR (RT-PCR) to measure osteonectin mRNA levels.
- Analysis of 84 thyroid normal and tumor tissues, including five anaplastic carcinomas and five anaplastic carcinoma cell lines.
Main Results:
- Osteonectin mRNA was found to be significantly increased in anaplastic carcinoma tissues compared to normal tissues.
- However, no significant increase in osteonectin mRNA expression was detected in the five anaplastic carcinoma cell lines.
- This indicates that the elevated osteonectin mRNA levels in tumor tissue are not originating from the carcinoma cells themselves.
Conclusions:
- The overexpression of osteonectin mRNA in anaplastic carcinoma tissue is likely due to its increased expression in the tumor stroma.
- Osteonectin may play a role in the tumor microenvironment of anaplastic thyroid carcinoma.
- Further research is warranted to elucidate the specific function of osteonectin in thyroid cancer progression.