Comparative characteristics of the transcriptional activity of CDH1, CTNNB1, VEGFA genes and expression of proteins E-cadherin, beta-catenin and VEGFA, coded by these genes in metastatic and non-metastatic endometrioid endometrial carcinoma

The violation of Wnt-signaling pathway and cyclic neoangiogenesis is early events in endometrial carcinogenesis. In this process an important role is played by epigenetic modifications and mutations of CDH1, CTNNB1, VEGFA genes, followed by expression violations of E-cadherin, beta-catenin, VEGFA encoded by them. The aim. To study the expression levels of mRNA of CDH1, CTNNB1, VEGFA genes and the expression levels of E-cadherin, beta-catenin, VEGFA in non-metastatic endometrioid endometrial carcinoma (EEC) and in EEC with metastases to regional lymph nodes. Materials and methods. Immunohistochemical study of invasive pT(1-4)N(0)M(x) endometrioid endometrial carcinoma (EEC) (n=56; age - 42-83 years), invasive pT(1-4)N(1-2)M(x) EEC (n=30; age - 48-79 years), samples of normal proliferative endometrium (PE) (n=30; age - 41-62 years) was performed. Molecular-genetic study of invasive pT(1-4)N(0)M(x) EEC (n=10; age - 45-67 years), invasive pT(1-4)N(1-2)M(x) EEC (n=10; age - 44-63 years), samples of PE (n=10; age - 46-59 years) was performed. Results. EEC is characterized by the lower mRNA expression level of CDH1 gene and by the higher mRNA expression levels of CTNNB1, VEGFA genes in comparison with the PE. E-cadherin expression level is 32.6 % lower in non-metastatic EEC and also is 58.10 % lower in metastatic EEC in comparison with the PE. beta-catenin expression level is 32.56 % lower in non-metastatic EEC and also is 58.11 % lower in metastatic EEC in comparison with the PE. VEGFA expression level is 27.72 % higher in non-metastatic EEC and also is 17.87 % higher in metastatic EEC in comparison with the PE. There is lower beta-catenin expression level in metastatic EEC in comparison with non-metastatic EEC. Non-metastatic and metastatic EEC is characterized by the direct medium connections between the mRNA expression levels of CTNNB1 and VEGFA genes (gamma=0.44), between the mRNA expression level of CTNNB1 gene and VEGFA expression level in the tumor (gamma=0.37). Conclusions. These changes contribute to tumor growth, invasion and metastasis.