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Increased expression of genes encoding mitochondrial proteins in papillary thyroid carcinomas
Dagny R Faksvåg Haugen1, Øystein Fluge, Laila J Reigstad
1Department of Oncology, Haukeland University Hospital, Bergen, Norway; and Department of Molecular Biology, University of Bergen, Bergen, Norway. dagny.naugen@haukeland.no
Thyroid : Official Journal of the American Thyroid Association
|September 11, 2003
Summary
Papillary thyroid carcinomas exhibit increased expression of mitochondrial genes and proteins. This study investigated gene expression differences, revealing significant mitochondrial alterations in tumor tissues.
Area of Science:
- Molecular Biology
- Oncology
- Genetics
Background:
- Papillary thyroid carcinoma (PTC) is the most common type of thyroid cancer.
- Understanding the molecular mechanisms underlying PTC development is crucial for diagnosis and treatment.
Purpose of the Study:
- To identify differences in gene expression between normal thyroid tissue and papillary thyroid carcinomas.
- To investigate the role of mitochondrial gene and protein expression in PTC.
Main Methods:
- Differential display (DD) polymerase chain reaction (PCR) was used to analyze gene expression.
- DNA dot-blot array hybridization and immunohistochemistry were employed for confirmation.
- Electron microscopy was utilized to assess mitochondrial morphology.
Main Results:
- Four mitochondrial genes (NADH dehydrogenase 5, ATP synthase 6, cytochrome b, cytochrome c oxidase I) were overexpressed in tumor tissue.
- Increased expression of cytochrome c oxidase III and mitochondrial proteins was observed in papillary carcinomas.
- Electron microscopy revealed an increased number and size of mitochondria in tumor samples.
Conclusions:
- Papillary thyroid carcinomas demonstrate elevated expression of mitochondrial mRNA and proteins.
- These alterations involve genes encoded by both mitochondrial and nuclear genomes.
- Mitochondrial dysfunction may play a significant role in the pathogenesis of papillary thyroid carcinoma.