Expression and significance of miR-30c-5p and Toll-like receptor 4 in colon cancer / 中国综合临床

ABSTRACT

Objective:To observe the expression of miR-30c-5p and Toll-like receptor 4(TLR4) in colon cancer tissues and cells, and to explore their relationship with clinicopathological features.Methods:As a prospective study, 30 cases of colon cancer surgical specimens and matched normal tissue samples were selected from the Cancer Hospital of China Medical University from May 2016 to may 2017.The expression of miR-30c-5p mRNA was detected by quantitative real-time polymerase chain reaction(qRT-PCR), and the expression of TLR4 Protein was detected by western blot (WC). The expression differences of miR-30c-5p mRNA and TLR4 protein in different TNM stages, differentiation degrees and diameters were observed.The correlation between the expression of miR-30c-5p and TLR4 Protein was analyzed by Pearson Rank method.Results:The expression of miR-30c-5p was lower in colon cancer tissues(0.311±0.147) than in adjacent normal colon tissues(0.881±0.266)( t=10.613, P<0.001). TLR4 protein was higher in colon cancer tissues(0.729±0.274) than in adjacent normal colon tissues(0.361±0.168)( t=6.310, P<0.001). Expression of miR-30c-5p was lower in colon cancer cell lines(0.394±0.045, 0.435±0.098, 0.533±0.092, 0.272±0.069) than in normal colon epithelial cell line(1.371±0.101)( t value were 6.744, 6.432, 6.865 and 6.201, respectively; P<0.001). The expression of TLR4 protein was higher in colon cancer cell lines(1.108±0.169, 1.035±0.177, 1.114±0.253, 1.116±0.157) than in normal colon epithelial tissues(0.358±0.094)( t value were 5.789, 4.799, 5.311 and 5.292, respectively; P<0.001). Pearson rank correlation showed that miR-30c-5p was negatively correlated with TLR4 protein expression( r=-0.487, 95% CI -0.721--0.154, P<0.01). MiR-30c-5p was decreased with TNM stage increasing( F=31.406, P<0.001), pathological differentiation degree decreasing( F=9.960, P<0.001), tumor diameter increasing( F=10.267, P<0.001). TLR4 was increasing with TNM stage increasing( F=37.634, P<0.001). TLR4 increased with the decrease of tumor differentiation( F=38.027.35, P<0.001). TLR4 increased with tumor diameter ( F=20.717, P<0.001). Conclusion:The low expression of mir-30c-5p and high expression of TLR4 in colon cancer were correlated with TNM stage and tumor volume.