Expression and Clinical Significance of Micro Ribonucleic Acid-132 and Sex-Determining Region Y-Box 4 in Colon Cancer

Abstract

This study aimed to investigate the expression and clinical significance of micro ribonucleic acid-132 and sex-determining region Y-box 4 gene in colon cancer. Luciferase reporter system was used to validate the target gene directly regulated by micro ribonucleic acid-132. Transwell invasion assay was used to test the effect of micro ribonucleic acid-132 on invasiveness of SW620 cells. Micro ribonucleic acid-132 and sex-determining region Y-box 4 expression levels in cancerous and peri-cancerous tissues were measured using in situ hybridization and EleVisionTM immunohistochemistry staining. Micro ribonucleic acid-132 downregulated sex-determining region Y-box 4 protein expression and inhibited the invasiveness of colon cancer cells. In the 72 cancerous tissue samples of colon cancer, micro ribonucleic acid-132 positive rate was 18.1 % (13/72) and sex-determining region Y-box 4 protein positive rate was 73.6 % (53/72), both expressions showed significant differences as compared to peri-cancerous tissues (p<0.01). Micro ribonucleic acid-132 expression was significantly lower in colon cancer tissues with lymph node metastasis than without lymph node metastasis (p<0.01). Sex-determining region Y-box 4 expression was elevated along with Dukes stage increase and higher expression was accompanied by more tumor invasion depth (both p<0.05). Sex-determining region Y-box 4 expression was significantly higher in colon cancer tissues with lymph node metastasis than without lymph node metastasis (p<0.01). Correlation analysis displayed significant negative correlation of micro ribonucleic acid-132 expression with sex-determining region Y-box 4 expression (r=-0.594, p=0.013). Micro ribonucleic acid-132 inhibits invasion and metastasis of colon cancer cell line SW620 via targeting sex-determining region Y-box 4. Low expression of micro ribonucleic acid-132 and high expression of sex-determining region Y-box 4 protein could be important biomarkers for malignant transformation of colonic mucosa and for invasion and metastasis of colon cancer. Measuring expression levels of both molecules is valuable for predicting invasion and metastasis of colon cancer.