ObjectiveTo evaluate the expression of miR-338-5p in colorectal cancer tissues and study its role in colon cancer cell proliferation, apoptosis, and cell cycle. MethodsThe expression of miR-338-5p was detected by real-time PCR in the colorectal cancer tissues and corresponding adjacent to cancer tissue samples. The miR-338-5p-mimics was transfected into the colon cancer cell lines HCT116 and SW620 to investigate its role in cell proliferation, apoptosis, and cell cycle. The cell proliferation and apoptosis were measured by CCK-8 and flow cytometry, respectively. The cell cycle was also analyzed by flow cytometry. Results①miR-338-5p expression was significantly downregulated in the colorectal cancer tissues as compared with corresponding adjacent to cancer tissue samples(P < 0.01). 2 Compared with the transfected negative control cells, the proliferation ability of colon cancer cell HCT116 or SW620 was significantly decreased(P < 0.01), cell apoptosis was significantly increased[HCT116 cell:(11.43±0.67)% versus(7.98±0.36)%, P < 0.01;SW620 cell:(10.5±0.2)% versus(7.93±0.5)%, P < 0.01), and cell G1 was arrested[HCT116 cell:(80.41±1.34)% versus (64.87±1.83)%, P < 0.01;SW620 cell:(68.76±0.41)% versus(54.89±0.78)%, P < 0.01) after transfecting miR-338-5p-mimics cells. ConclusionmiR-338-5p may act as an anti-oncogene in colorectal cancer through regulation of cell proliferation, apoptosis, and cell cycle.
ObjectiveTo investigate the expression of catechol O-methyltransferase (COMT) mRNA and its protein in colorectal adenoma tissues and corresponding adjacent tissues, colorectal cancer tissues and corresponding adjacent tissues. MethodsExpressions of COMT mRNA and its protein were evaluated by real-time PCR and immunohistochemistry method in colorectal adenoma tissues and corresponding adjacent tissues, colorectal cancer tissues and corresponding adjacent tissues. Meanwhile, the relationship between the expression of COMT and clinic-pathological features of colorectal adenoma and colorectal cancer were analyzed. Results①The expression of COMT mRNA in colorectal adenoma tissue/colorectal cancer tissue group was higher than that of corresponding adjacent tissue group (0.109 0 vs. 0.000 5, t=3.02, P=0.01; 0.041 8 vs. 0.013 5, t=2.71, P=0.02).②The rate of high-expression of COMT in colorectal adenoma tissue/colorectal cancer tissue group was higher than that of corresponding adjacent tissue group [72.34% (34/47) vs. 25.53% (12/47), χ2=28.72, P < 0.01; 66.67% (28/42) vs. 28.57% (12/42), χ2=4.97, P < 0.05].③High-expression of COMT was not related to age, gender, location of tumor, and pathological type in colorectal adenoma patients (P > 0.05). High-expression of COMT was not related to age, gender, location of tumor, and differentiation degree (P > 0.05), but was related to TNM staging, T staging, and N staging in colorectal cancer patients (P < 0.05), the patients of TNMⅠ+Ⅱstaging, T1+T2 staging, and N0 staging had higher rate of high-expression of COMT. ConclusionCompared with corresponding adjacent tissues, COMT expresses highly in colorectal adenoma tissues and colorectal cancer tissues, so it may play a partial role in the emergence and development of colorectal cancer.