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Thorac Cancer ; 10(3): 445-451, 2019 03.
Artículo en Inglés | MEDLINE | ID: mdl-30628176

RESUMEN

BACKGROUND: The etiology of thymic epithelial tumors is unknown. Murine polyomavirus strain PTA has been shown to induce thymomas in mice. Recently, using diverse molecular techniques, we reported the presence of human polyomavirus 7 (HPyV7) in thymic epithelial tumors. In the present study, we investigated the prevalence of Merkel cell polyomavirus (MCPyV) in thymic epithelial tumors. METHODS: Thirty-six thymomas were screened for MCPyV by PCR and subsequently tested by DNA and RNA in situ hybridization and immunohistochemistry. Twenty-six thymomas were diagnosed with myasthenia gravis (MG). RESULTS: MCPyV DNA was detected by PCR in 7 (19.4%) of the 36 thymic epithelial tumors and in six of these, the presence of MCPyV was confirmed by fluorescence situ hybridization. Of these, 3 (28.6%) revealed weak MCPyV LT-antigen protein expression. In addition, one of the MCPyV positive thymomas tested positive for MCPyV LT RNA with RNAscope. Of interest, two out of the three thymomas that previously tested positive for MCPyV by immunohistochemistry also tested positive for HPyV7. One of the 11 MG-negative and 2 of the 25 MG-positive were positive for MCPyV. CONCLUSIONS: MCPyV DNA and MCPyV protein expression can be detected in human epithelial thymoma; however, to a far lesser extent than HPyV7. Our data strongly indicate that because of its infrequent detection and weak expression, MCPyV is unlikely to play an important role in the etiopathogenesis of human thymomas.


Asunto(s)
Poliomavirus de Células de Merkel/genética , Neoplasias Glandulares y Epiteliales/genética , Timoma/genética , Neoplasias del Timo/genética , Proteínas Virales/genética , Adulto , Anciano , Anciano de 80 o más Años , Animales , Carcinogénesis/genética , Femenino , Regulación Neoplásica de la Expresión Génica/genética , Humanos , Hibridación Fluorescente in Situ/métodos , Masculino , Poliomavirus de Células de Merkel/patogenicidad , Ratones , Persona de Mediana Edad , Neoplasias Glandulares y Epiteliales/epidemiología , Neoplasias Glandulares y Epiteliales/patología , Neoplasias Glandulares y Epiteliales/virología , Timoma/epidemiología , Timoma/patología , Timoma/virología , Neoplasias del Timo/epidemiología , Neoplasias del Timo/patología , Neoplasias del Timo/virología
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