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Title: [MIR503HG promotes esophageal squamous cell carcinoma cell proliferation, invasion and migration via hsa-miR-503 pathway].
Author: Gong TY, Chen HY, Liu ZH.
Journal: Zhonghua Zhong Liu Za Zhi; 2022 Nov 23; 44(11):1160-1167. PubMed ID: 36380664.
Abstract:
Objective: To explore the function and mechanism of long non-coding RNA MIR503HG in esophageal squamous cell carcinoma (ESCC). Methods: The MIR503HG expression data in 60, 119 and 23 cases of ESCC and their paired adjacent tissues were chosen from three ESCC datasets GSE53622, GSE53624 and GSE130078, respectively. The expression data of MIR503HG in 81 ESCC tissues and 271 unpaired normal esophageal tissues were screened from the combined dataset of Cancer Genome Atlas and Genotype-Tissue Expression Database (TCGA+ GTEx). The MIR503HG knockdown plasmid was constructed, packaged into lentivirus. The lentivirus was used to infect with esophageal squamous cell carcinoma cell lines KYSE30 and KYSE510 to screen out the stable MIR503HG knockdown cell lines. ESCC cell line KYSE30 was transiently transfected with miRNA mimics to overexpress hsa-miR-503-3p and hsa-miR-503-5p.The expression levels of MIR503HG, hsa-miR-503-3p and hsa-miR-503-5p were detected by quantitative real-time polymerase chain reaction. The proliferation ability of the cells was detected by cell counting kit 8 and clone formation assay. The invasion and migration ability of the cells were detected by Transwell assay. Cell cycle was detected by flow cytometry. The effect of MIR503HG on the proliferation of ESCC was detected by xenograft experiment in BALB/c-nu/nu mice. Results: Both GEO and TCGA+ GTEx databases showed that the expression of MIR503HG in ESCC tissues was higher than that in adjacent tissues and normal esophageal tissues (P<0.01). Compared with shNC group, the proliferation rates of KYSE30 and KYSE510 cells after knockdown of MIR503HGwere significantly inhibited (P<0.001). The colony formation numbers of KYSE30 cells in shMIR503HG1 group and shMIR503HG2 group were (2.00±1.41) and (1.33±0.47), respectively, significantly lower than that of the shNC group (P=0.002). The clone formation numbers of KYSE510 cells in shMIR503HG1 group and shMIR503HG2 group were (174.67±15.97) and (80.33±6.34), respectively, significantly lower than that of the shNC group (P<0.001). The invasive numbers of KYSE30 cells in shMIR503HG1 group and shMIR503HG2 group were 75.33±6.02 and 45.67±7.59, significantly lower than that of the shNC group(P<0.001). The migrating number of KYSE30 cells in shMIR503HG1 group and shMIR503HG2 group were 244.00±10.23 and 210.67±13.52, significantly lower than that of the shNC group(P<0.001), and the cell cycle was arrested in G(0)/G(1) phase. The xenograft experiment showed that the subcutaneous tumor in shMIR503HG group was significantly smaller than that in shNC group, and the tumor weight in shMIR503HG group was (0.097±0.026) g, which was lower than (0.166±0.021) g in shNC group (P<0.001). After knockdown of MIR503HG, the relative expression levels of hsa-miR-503-3p in KYSE30 cells of shMIR503HG1 group and shMIR503HG2 group were 0.66±0.02 and 0.58±0.00, respectively, the relative expression levels of hsa-miR-503-5p were 0.64±0.00 and 0.68±0.03, respectively, which were all lower than those in shNC group (P<0.01). After knockdown of MIR503HG, overexpression of hsa-miR-503-3p and hsa-miR-503-5p attenuated the inhibitory effects of knockdown of MIR503HG on proliferation (P<0.001), invasion (P<0.01) and migration (P<0.001) of KYSE30 cells. Conclusions: MIR503HG promotes the proliferation, invasion and migration of ESCC cells by regulating hsa-miR-503 pathway and can be used as a new potential target for targeted therapy of ESCC. 目的： 探讨miR503宿主基因(MIR503HG)在食管鳞癌细胞中的功能及机制。 方法： 从基因表达综合数据库(GEO)的3个食管鳞癌数据集GSE53622、GSE53624、GSE130078中分别提取60例、119例和23例食管鳞癌及其配对癌旁组织的MIR503HG表达资料，从癌症基因组图谱数据库与基因型-组织表达数据库的组合数据集(TCGA+GTEx)中提取81例食管鳞癌组织、271例非配对正常食管组织的MIR503HG表达资料。构建MIR503HG敲降质粒，包装成慢病毒，感染食管鳞癌细胞系KYSE30和KYSE510，筛选出稳定敲降MIR503HG的细胞系。对食管鳞癌细胞KYSE30瞬时转染miRNA的模拟物，以过表达hsa-miR-503-3p和hsa-miR-503-5p。采用实时荧光定量聚合酶链反应检测MIR503HG、hsa-miR-503-3p和hsa-miR-503-5p的表达水平，细胞计数试剂盒8法和克隆形成实验检测细胞的增殖能力，Transwell实验检测细胞的侵袭、迁移能力，流式细胞术检测细胞周期。裸鼠皮下移植瘤实验检测MIR503HG对食管鳞癌增殖的影响。 结果： GEO和TCGA+GTEx数据库资料显示，食管鳞癌组织中MIR503HG的表达高于癌旁组织和正常食管组织(均P<0.01)。敲降MIR503HG后与shNC组比较，KYSE30和KYSE510细胞的增殖速率均明显受到抑制(均P<0.001)，克隆形成数均降低[shMIR503HG1组和shMIR503HG2组KYSE30细胞的克隆形成数分别为(2.00±1.41)个和(1.33±0.47)个，均P＝0.002；shMIR503HG1组和shMIR503HG2组KYSE510细胞的克隆形成数分别为(174.67±15.97)个和(80.33±6.34)个，均P<0.001]，使KYSE30细胞的侵袭细胞数减少[shMIR503HG1组和shMIR503HG2组侵袭细胞数分别为(75.33±6.02)个和(45.67±7.59)个，均P<0.001]，迁移细胞数减少[shMIR503HG1组和shMIR503HG2组细胞迁移数分别为(244.00±10.23)个和(210.67±13.52)个，均P<0.001]，细胞周期阻滞在G(0)/G(1)期。皮下移植瘤实验显示，shMIR503HG组小鼠皮下移植瘤明显小于shNC组，shMIR503HG组肿瘤重量为(0.097±0.026)g，低于shNC组[(0.166±0.021)g，P<0.001]。敲降MIR503HG后，shMIR503HG1组和shMIR503HG2组KYSE30细胞中hsa-miR-503-3p的相对表达水平分别为0.66±0.02和0.58±0.00，hsa-miR-503-5p的相对表达水平分别为0.64±0.00和0.68±0.03，均低于shNC组(均P<0.01)。在敲降MIR503HG后，过表达hsa-miR-503-3p和hsa-miR-503-5p能减弱敲降MIR503HG对KYSE30细胞增殖(均P<0.001)、侵袭(均P<0.01)和迁移(均P<0.001)的抑制作用。 结论： MIR503HG通过调控hsa-miR-503信号通路促进食管鳞癌细胞的增殖、侵袭和迁移，在食管鳞癌中发挥癌基因的功能，可以作为食管鳞癌靶向治疗的一个新的潜在靶点。.

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