Genomic gain of PIK3CA and increased expression of p110alpha are associated with progression of dysplasia into invasive squamous cell carcinoma
| Autor: | Irina Fenic, Ulrich Stahl, Thomas Dreyer, Eva Werner, Joachim Woenckhaus, Ulrike Gamerdinger, Klaus Steger |
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| Rok vydání: | 2002 |
| Předmět: |
Adult
Male medicine.medical_specialty Palatine Tonsil In situ hybridization Biology medicine.disease_cause Pathology and Forensic Medicine Phosphatidylinositol 3-Kinases medicine Carcinoma Humans Neoplasm Invasiveness RNA Messenger RNA Neoplasm In Situ Hybridization Fluorescence Aged Chromosome Aberrations medicine.diagnostic_test Cytogenetics Middle Aged medicine.disease Head and neck squamous-cell carcinoma Molecular biology Neoplasm Proteins Gene Expression Regulation Neoplastic Epidermoid carcinoma Dysplasia Head and Neck Neoplasms Carcinoma Squamous Cell Disease Progression Female Carcinogenesis Precancerous Conditions Fluorescence in situ hybridization |
| Zdroj: | The Journal of pathology. 198(3) |
| ISSN: | 0022-3417 |
| Popis: | PIK3CA, encoding the catalytic subunit p110α of phosphatidylinositol 3-kinase (PI3K), is activated in malignant diseases. However, the role of the PIK3CA gene aberrations for tumourigenesis of head and neck squamous cell carcinoma (HNSCC) is to date unclear. The present study was designed to determine the genomic aberration of PIK3CA in invasive HNSCC and dysplastic precursor lesions by fluorescence in situ hybridization (FISH) with a YAC probe, containing the PIK3CA gene, on isolated interphase nuclei from histomorphologically well-defined regions of formalin-fixed tissue sections and to compare these data with protein and mRNA expression of p110α. The mRNA and protein levels of p110α were assessed, respectively, by in situ hybridization and immunohistochemistry on consecutive tissue sections. Copy number gains at 3q26 were observed in one of six low-to-moderate dysplasias (17%) and in seven of nine high-grade dysplasias (78%), as well as in 11 carcinomas (100%). In addition, one of seven high-grade dysplasias (14%) and 6 of 11 carcinomas (55%) had amplifications of 3q26. The majority of cases with copy number gain in more than 50% of the cells and/or amplification in more than 10% of cells showed increased p110α mRNA and protein expression, whereas only two cases (18%) (one high-grade dysplasia and one carcinoma) with no gain or low-level gain displayed increased p110α protein expression. These data suggest that 3q26 copy number gain and amplification represent early genomic aberrations in HNSCC carcinogenesis. In addition, p110α mRNA and protein expression in HNSCC may be regulated by these genomic aberrations as well as by epigenetic events. Copyright © 2002 John Wiley & Sons, Ltd. |
| Databáze: | OpenAIRE |
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