miR-124 通过靶向BECN1 基因调控细胞自噬抑制食管癌KYSE170 细胞的侵袭和迁移

目的：探讨miR-124 通过调控细胞自噬对食管癌KYSE170 细胞侵袭和迁移能力的影响。方法：食管癌KYSE170 细胞转染miR-124 mimic，Transwell 实验检测细胞侵袭和迁移能力的变化，双荧光素酶报告基因验证miR-124 对BECN1(Beclin1)基因的靶向调控作用，Western blotting 分析对BECN1、P62 及LC3 蛋白表达水平的影响。向KYSE170 细胞中转染BECN1 siRNA沉默BECN1 的表达，Transwell 法检测细胞侵袭及迁移能力的变化，Western blotting 检测BECN1、P62 及LC3 蛋白的表达。将miR-124 mimic 与BECN1 过表达质粒共转染至KYSE170 细胞，Transwell 实验检测细胞侵袭及迁移能力的变化，Western blotting 检测自噬相关基因表达的变化。结果：转染miR-124 mimic 后，KYSE170 细胞的侵袭和迁移能力下降(P<0.05)，BECN1 蛋白及荧光素酶报告基因活性均明显下调(均P<0.01)，自噬相关蛋白P62 表达增高，LC3 表达水平明显降低(均P<0.01)。沉默BECN1 表达抑制食管癌细胞侵袭及迁移(P<0.01)，而过表达BECN1 使miR-124 mimic 对KYSE170 细胞自噬、侵袭和迁移能力的抑制作用明显减弱(P<0.01)，自噬相关蛋白P62 表达降低、LC3 蛋白表达水平明显升高(均P<0.01)。结论：miR-124 能够抑制食管癌细胞侵袭及迁移能力，其机制可能与靶向调控自噬相关基因BECN1 的表达影响细胞自噬有关。

miR-124 regulates autophagy to inhibit invasion and migration of esophageal cancer KYSE170 cells by targeting BECN1

Objective: To investigate the effect of miR-124 on the invasion and migration of esophageal cancer KYSE170 cells by regulating autophagy. Methods: miR-124 mimic was transfected into esophageal cancer KYSE170 cells. Transwell assay was used to detect the change of invasion and migration ability of cells. Dual luciferase reporter gene assay was used to verify the targeted regulation of BECN1 (Beclin1) by miR-124, and Western blotting was used to analyze the expressions of BECN1, P62 and LC3 protein. siRNA targeting BECN1 was transfeted into KYSE170 cells, and then the cell invasion and migration ability was calculated by Transwell assay. The expressions of BECN1, P62 and LC3 protein were detected by Western blotting. miR-124 mimic and BECN1 over-expression plasmid were co-transfected into KYSE170 cells, and then Transwell assay was used to detect the changes of cell invasion and migration ability, and Western blotting to examine the expression levels of autophagy-related gene. Results: The invasion and migration ability of KYSE170 cells were significantly inhibited after transfection with miR-124 mimic (All P<0.05). The expression of autophagyrelated protein P62 was increased, and the expression of BECN1 and LC3 was significantly decreased (All P<0.01); in addition, the activity of luciferase reporter gene was also significantly reduced (P<0.01). Silencing BECN1 expression inhibited the invasion and migration of esophageal cancer KYSE170 cells (P<0.01). However, after co-transfection with BECN1 over-expression plasmids, the effects of miR-124 mimic on the autophagy, invasion and migration of esophageal carcinoma KYSE170 cells were significantly weakened (P<0.01), it was also accompanied with lower P62 expression, and higher LC3 expression (P<0.01). Conclusion: miR-124 mimic can inhibit the invasion and migration of esophageal carcinoma cells. The mechanism may be related to the autophagy-related gene BECN1 expression.