Data/hora: 19/05/2024 04:20:28

Provedor de dados: 	Brazilian Journal of Medical and Biological Research	
País: 	Brazil	
Título: 	Radiotherapy modulates expression of EGFR, ERCC1 and p53 in cervical cancer	
Autores: 	de Almeida,V.H.; de Melo,A.C.; Meira,D.D.; Pires,A.C.; Nogueira-Rodrigues,A.; Pimenta-Inada,H.K.; Alves,F.G.; Moralez,G.; Thiago,L.S.; Ferreira,C.G.; Sternberg,C.	
Data: 	2018-01-01	
Ano: 	2018	
Palavras-chave: 	Cervical cancer; Radiotherapy; Epidermal growth factor receptor (EGFR); P53; Excision repair cross-complementation group 1 (ERCC1).	
Resumo: 	Cervical cancer is a public health problem and the molecular mechanisms underlying radioresistance are still poorly understood. Here, we evaluated the modulation of key molecules involved in cell proliferation, cell cycle and DNA repair in cervical cancer cell lines (CASKI and C33A) and in malignant tissues biopsied from 10 patients before and after radiotherapy. The expression patterns of epidermal growth factor receptor (EGFR), excision repair cross-complementation group 1 (ERCC1) and p53 were evaluated in cancer cell lines by quantitative PCR and western blotting, and in human malignant tissues by immunohistochemistry. The mutation status of TP53 gene was evaluated by direct sequencing. Among cell lines, absent or weak modulations of EGFR, ERCC1 and p53 were observed after exposure to 1.8 Gy. Conversely, increased expressions of p53 (5/10 patients; P=0.0239), ERCC1 (5/10 patients; P=0.0294) and EGFR (4/10 patients; P=0.1773) were observed in malignant tissues after radiotherapy with the same radiation dose. TP53 mutations were found only in one patient. Here we show that a single dose of radiotherapy induced EGFR, ERCC1 and p53 expression in malignant tissues from cervical cancer patients but not in cancer cell lines, highlighting the gap between in vitro and in vivo experimental models. Studies on larger patient cohorts are needed to allow an interpretation that an upregulation of p53, EGFR and ERCC1 may be part of a radioresistance mechanism.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2018000100608	
Editor: 	Associação Brasileira de Divulgação Científica	
Relação: 	10.1590/1414-431x20176822	
Formato: 	text/html	
Fonte: 	Brazilian Journal of Medical and Biological Research  v.51 n.1 2018	
Fonte: 	info:eu-repo/semantics/openAccess