Expression of IGFBP-6 in colorectal cancer: the relation with insulin-like growth factor receptor, adiponectin level and its receptors
The aim of the study was to investigate the expression of insulin-like growth factor binding protein 6 (IGFBP-6) in cancer tissues in relation with clinical and morphological parameters, IGF-IR expression, serum adiponectin level and its receptors (AdipoR1, AdipoR2) in patients with colorectal cancer. Material and Methods. The study included 31 patients with colorectal cancer (T <sub>2-4</sub>N <sub>0-2</sub>M <sub>0</sub>). Serum adiponectin level, AdipoR1 and AdipoR2 expression were evaluated with ELISA. IGF-IR expression was evaluated in tumor tissue by flow cytometry. IGFBP-6 expression was evaluated with Western blotting. Results. The dependence of IGFBP-6 expression, AdipoR1, AdipoR2 on tumor invasion and lymph nodes status were revealed. There is no association IGFBP-6 expression, AdipoR1 and AdipoR2 expression and serum adiponectin level with metabolic syndrome. The revealed positive relationships between IGFBP-6 expression and AdipoR1 expression, between IGFBP-6 expression and AdipoR2 expression, between IGF-IR and AdipoR1 expression show cross-talk between IGF-IR and adiponectin/AdipoR1 pathways in colorectal carcinomas.