miR-218-5p通过调控LAYN抑制结肠癌发展的机制

miR-218-5p Inhibits the Development of Colon Cancer by Regulating LAYN

目的探讨miR-218-5p和LAYN在结肠癌中的表达水平以及二者的调控关系对结肠癌进展的影响。方法采用RT-qPCR对结肠癌组织、癌旁组织以及细胞系中的miR-218-5p的表达进行检测。采用Western blot对结肠癌组织、癌旁组织和细胞系中的LAYN蛋白表达水平进行检测。采用原位杂交(in situ hybridizsation,ISH)实验对结肠癌组织和癌旁组织中的miR-218-5p的表达进行检测。采用免疫组化(immunohistochemistry,IHC)实验对结肠癌组织和癌旁组织中的LAYN蛋白分布和表达进行检测。采用双荧光素酶实验对miR-218-5p与LAYN的3’-非翻译区(rn-translation region,UTR)的结合关系进行检测。采用CCK-8对细胞的增殖进行检测;采用Transwell法对细胞的侵袭能力进行检测;采用流式细胞术对细胞的凋亡水平进行检测;采用Western blot对细胞中cleaved Caspase3表达水平进行检测。结果在结肠癌组织和结肠癌细胞系中,miR-218-5p表达降低并且HT-29细胞中表达最低(P<0.0001),LAYN表达升高并且HT-29细胞中表达最高(P<0.05)。双荧光素酶报告基因实验结合Western blot实验表明miR-218-5p可以结合在LAYN的3’U TR区域并抑制其蛋白表达(P<0.01)。在细胞实验中,过表达miR-218-5p抑制细胞增殖(P<0.05)、侵袭(P<0.001)并增加凋亡(P<0.01)和cleaved Caspase3蛋白的表达(P<0.01);过表达LAYN促进细胞增殖(P<0.05)、侵袭(P<0.001)并减少凋亡(P<0.0001)和cleaved Caspase 3蛋白的表达(P<0.01),同时过表达miR-218-5p和LAYN部分逆转了上述变化。结论在结肠癌组织中,miR-218-5p表达水平降低,细胞实验表明miR-218-5p通过靶向调控LAYN抑制细胞的侵袭和增殖,促进其凋亡。

Objective To investigate the expression level of miR-218-5p and LAYN in colon cancer and the effects of their regulatory relationship on the progress of colon cancer.Methods RT-qPCR was used to detect the expression of miR-218-5p in colon cancer tissues,adjacent tissues,and cell lines.Western blot was used to detect the expression level of LAYN protein in colon cancer tissues,adjacent tissues,and cell lines.The in situ hybridization(ISH)was used to detect the expression of miR-218-5p in colon cancer and adjacent tissues.Immunohistochemical(IHC)experiment was used to detect the distribution and expression of LAYN protein in colon cancer tissues and adjacent tissues.The dual luciferase experiment was used to detect the binding relationship between miR-218-5p and 3'-rn-translation region(UTR)of LAYN.CCK-8 was used to detect the cell proliferation.Transwell was used to detect the invasion ability of cells.The flow cytometry was used to detect the apoptosis level of cells.Western blot was used to detect the expression level of cleaved Caspase3 in cells.Results The expression of miR-218-5p decreased in colon cancer tissues and colon cancer cell lines,with the lowest expression in HT-29 cells(P<0.0001),and the expression of LAYN increased and the highest expression in HT-29 cells(P<0.05).The double luciferase reporter gene experiment(P<0.01)combined with Western blot experiment(P<0.01)showed that miR-218-5p could bind to the 3'UTR region of LAYN and inhibit its protein expression.In cell experiments,overexpression of miR-218-5p inhibited cell proliferation(P<0.05),invasion(P<0.001),and increased apoptosis(P<0.01),and the expression of cleaved Caspase3 protein(P<0.01).Overexpression of LAYN promoted cell proliferation(P<0.05),invasion(P<0.001),and decreased apoptosis(P<0.0001)and the expression of cleaved Caspase3 protein(P<0.01),while overexpression of miR-218-5p and LAYN partially reversed the above changes.Conclusion The expression level of miR-218-5p is decreased in colon cancer tissues.Cell experiments show that miR-218-5p inhibits cell invasion and proliferation and promotes cell apoptosis through targeted regulation of LAYN.