| Popis: |
The aggressiveness of brain tumors is attributed to the expression of multiple oncogenes involved in proliferation, metabolism and therapeutic resistance whose potential correlation with tumor progression has not been well-studied. In this study, we aimed to investigate the relationship of oncotargets involved in pathogenesis with respect to glioma grades. Gliomas ( n =40) were analyzed by reverse transcription-polymerase chain reaction (RT-PCR) and sequencing for the detection of epidermal growth factor receptor ( EGFR ) mutants. Expressions levels of EGFR , EGFR variant III ( EGFRvIII ), Lck/Yes novel tyrosine kinase ( LYN ), Spleen tyrosine kinase ( SYK ), insulin receptor substrate 1 ( IRS1 ), phosphatidylinositol 3-kinase ( PI3K ), Src homology 2 domain-containing inositol 5-phosphatase 1 ( SHIP1 ) and glucose transporter 3 ( GLUT3 ) were studied using real-time PCR and compared against glioma grades via statistical methods. Protein expressions were analyzed using immunohistochemistry and western blotting. EGFRvIII was detected in 53% and exon 4 deletion ( de4 EGFR ) in 20% of gliomas. Importantly, the expressions levels of candidate oncogenes were significantly upregulated ( P |
