p-mTOR, p-4EBP-1 and eIF4E expression in canine prostatic carcinoma

Publication date: Available online 16 November 2018Source: Research in Veterinary ScienceAuthor(s): Luis G. Rivera-Calderón, Carlos E. Fonseca-Alves, Priscila E. Kobayashi, Márcio Carvalho, Rosemeri O. Vasconcelos, Renée Laufer-AmorimAbstractThe mTOR/4E-BP1/eIF4E pathway plays important roles in the neoplastic transformation process and in tumour growth. In men, the mTOR/4E-BP1/eIF4E pathway was described as altered in different tumours, including prostate cancer (PC). Apart from humans, the dog is the only species that develops PC with high frequency and is considered a good model for comparative oncology initiatives. Due to limited information on this pathway in canine tumours, this study aimed to investigate mTOR, 4E-BP1 and eIF4E gene and protein expression in canine PC, as well as in metastatic and normal prostatic tissues, and to evaluate the correlations between gene/protein expression and Gleason score (GS) in PC. A total of 35 formalin-fixed paraffin-embedded (FFPE) samples, including 13 of normal prostatic tissue, 17 PC samples and 5 metastasis samples, were evaluated by immunohistochemistry and qPCR. mTOR gene mutation in the kinase domain was also investigated. We identified higher p-mTOR and eIF4E protein levels in canine PC with higher GS values (≥ 8) and a significant positive correlation in expression between these proteins. eIF4E overexpression was observed in metastasis relative to expression in normal samples. Our data suggest that p-mTOR and eIF4E exp...
Source: Research in Veterinary Science - Category: Veterinary Research Source Type: research