miR-1-3p通过调控STC2抑制人食管鳞状细胞癌细胞的恶性生物学行为

miR-1-3p Inhibits Malignant Biological Behavior of Human Esophageal Squamous Cell Carcinoma Cells by Regulating STC2

目的探讨miR-1-3p对人食管鳞状细胞癌(ESCC)细胞的恶性生物学行为的影响及其可能的作用机制。方法利用基因表达数据库(GEO)筛选ESCC中差异表达的miRNA。采用qRT-PCR检测人ESCC细胞KYSE30、KYSE150、KYSE410、KYSE510和Eca109及正常食管上皮细胞HET-1A中miR-1-3p的表达水平。CCK-8试剂盒、划痕愈合和Transwell实验以及流式细胞术分别检测转染miR-1-3p mimic对ESCC细胞增殖、迁移和侵袭、凋亡能力的影响。使用生物信息学工具预测miR-1-3p的靶基因,Kaplan-Meier法分析癌症基因组图谱(TCGA)数据库中STC2表达水平与患者预后的关系。采用FISH检测miR-1-3p的亚细胞定位,双荧光素酶报告基因验证miR-1-3p与STC2的靶向关系。RNA免疫沉淀(RIP)实验检测miR-1-3phe STC2的结合。Western blot法检测转染miR-1-3p mimic对ESCC细胞中STC2及内质网应激相关蛋白p-PERK、p-eIF2α、ATF4表达水平的影响。CCK-8、划痕愈合、Transwell实验和流式细胞术分别检测过表达和敲低STC2对ESCC细胞增殖、迁移、侵袭和凋亡能力的影响。结果ESCC细胞中miR-1-3p的表达水平均低于HET-1A细胞(均P<0.05),转染miR-1-3p mimic可抑制ESCC细胞增殖、迁移和侵袭能力(均P<0.05),促进ESCC细胞凋亡(均P<0.001)。生物信息学工具预测miR-1-3p的靶基因为STC2,ESCC组织中STC2的表达水平高于正常食管上皮组织,与预后呈负相关(均P<0.05)。miR-1-3p位于胞质,并可直接与STC2 mRNA结合。转染miR-1-3p mimic可下调STC2、p-PERK、p-eIF2α、ATF4蛋白的表达水平(均P<0.05)。过表达STC2可促进ESCC细胞增殖、迁移和侵袭能力(均P<0.05),抑制ESCC细胞凋亡(均P<0.05)。敲低STC2可抑制ESCC细胞增殖、迁移和侵袭能力(均P<0.05),促进ESCC细胞凋亡(均P<0.05)。结论miR-1-3p通过靶向调控STC2抑制ESCC细胞的恶性生物学行为,促进ESCC细胞凋亡,可能是通过抑制内质网应激发挥作用。

Objective To explore the effect of miR-1-3p on the malignant biological behavior of human esophageal squamous cell carcinoma cells and the potential mechanisms.Methods The Gene Expression Omnibus(GEO)database was analyzed to screen differentially expressed miRNAs in esophageal squamous cell carcinoma(ESCC).qRT-PCR was used to detect the expression of miR-1-3p in human ESCC cell lines(KYSE30,KYSE150,KYSE410,KYSE510,and Eca109)and normal esophageal epithelial cell line HET-1A.CCK-8,wound healing,Transwell assays,and flow cytometry were applied to detect the effect of miR-1-3p on the proliferation,migration,invasion,and apoptosis of ESCC cells.Bioinformatics tool was used to predict the target genes of miR-1-3p.A Kaplan–Meier survival curve was drawn to analyze the correlation between STC2 expression and overall survival of patients in the ESCC cohort of the TCGA database.Fluorescence in situ hybridization was performed to verify the subcellular location of miR-1-3p in ESCC cells,and dualluciferase reporter gene assay was performed to validate the regulation of miR-1-3p on stanniocalcin 2(STC2).RNA immunoprecipitation assays were used to detect the binding of miR-1-3p and STC2.Western blot assay was performed to determine the effect of miR-1-3p on the expression of STC2 and endoplasmic reticulum stress pathway-related proteins,including p-PERK,p-eIF2α,and ATF4.CCK-8,wound healing,Transwell assays,and flow cytometry were applied to detect the effect of STC2 overexpression and knockdown on the proliferation,migration,invasion,and apoptosis of ESCC cells.Results The expression of miR-1-3p was lower in ESCC cell lines than in HET-1A cells(all P<0.05).The transfection of miR-1-3p mimic decreased the proliferation,invasion,and migration of ESCC cells(all P<0.05)and promoted the apoptosis of ESCC cells(all P<0.001).Bioinformatics tool showed that STC2 was a target gene of miR-1-3p.The expression of STC2 in ESCC tissues was higher than that in normal esophageal epithelial tissues in the ESCC cohort of TCGA database and was negatively correlated with prognosis(all P<0.05).miR-1-3p was located in the cytoplasm and can directly bind to STC2 mRNA.The transfection of miR-1-3p mimic downregulated the expression of STC2,p-PERK,p-eIF2α,and ATF4(all P<0.05).The overexpression of STC2 promoted the proliferation,invasion,and migration(all P<0.05)and inhibited the apoptosis of ESCC cells(all P<0.05).Knockdown of STC2 inhibited the proliferation,invasion,and migration(all P<0.05)and promoted the apoptosis of ESCC cells(all P<0.05).Conclusion miR-1-3p inhibits the malignant biological behavior and promotes the apoptosis of esophageal squamous cell carcinoma cells by regulating STC2 possibly by suppressing the endoplasmic reticulum stress.