[Abstract] Objective: To investigate the expression of transgelin (TAGLN) in colorectal cancer (CRC) tissues and its effect on the proliferation, migration and invasion of CRC SW480 cells. Methods: Surgically resected CRC tissues and corresponding para-cancerous tissues of 97 CRC patients from May 2015 to August 2016 in the Affiliated Tumor Hospital of Zhengzhou University were collected; In addition, CRC cell lines SW620, SW480, HCT116 and normal colorectal mucosal cell line FHC were also collected for this study. Immunohistochemical staining was used to detect the expression of TAGLN in CRC tissues, and the correlation between TAGLN and patients’ clinicopathological features was analyzed. Quantitative Real-time quantitative polymerase chain reaction (qPCR) and Western blotting (WB) were used to detect the mRNA and protein expressions of TAGLN in CRC cell lines. si-TAGLN and si-Ctrl were respectively transfected into SW480 cells by liposome transfection method. The effects of silencing TAGLN on the proliferation, migration and invasion of SW480 cells were detected by CCK-8, Wound-healing assay and Transwell assay, respectively; and the expression of EMT-related proteins E-cadherin, N-cadherin and vimentin were detected by WB. Results: The positive expression rate of TAGLN in CRC tissues was significantly higher than that in para-cancerous tissues (P<0.01), and TAGLN expression was correlated with TNM stage, degree of tumor differentiation and lymph node metastasis in CRC patients (P<0.05 or P<0.01). The mRNA and protein expression levels of TAGLN in SW480 cells were significantly higher than those in FHC cells (all P<0.01). After TAGLN silence, the proliferation, invasion and migration ability of SW480 cells were significantly reduced (all P<0.01), the expression level of E-cadherin in SW480 cells was increased, while the expression levels of N-cadherin and vimentin were decreased (all P<0.01). Conclusion: TAGLN is highly expressed in CRC tissues and cells. Silencing TAGLN can inhibit the proliferation, invasion and migration of CRC cells, suggesting that TAGLN plays an important role in the occurrence and development of CRC.

[摘 要] 目的：探讨谷胱甘肽过氧化物酶（GPX）家族在胶质瘤发生发展中的生物学功能和预后价值。方法：利用TCGA、GTEx和CGGA等多个数据库数据分析胶质瘤中GPX各亚型基因的表达及其相关性、蛋白之间的相互作用、基因突变、GPX表达与胶质瘤患者预后的关系以及GPX7、8的基因集富集分析；GPX8与胶质瘤中免疫细胞浸润以及免疫检查点分子表达的相关性分析，胶质瘤中GPX8表达与化疗药物IC50的相关性分析。采用qPCR法、WB法和免疫荧光技术检测国人胶质瘤组织和对照组织（标本收集自2022年10月20日至12月20日间在上海奉贤区中心医院神经外科手术切除的5例胶质瘤和3例严重脑外伤的病灶组织）中GPX mRNA、蛋白以及相关免疫检查点分子的表达进行验证。结果：数据库分析显示胶质瘤中GPX各亚型蛋白之间存在相互作用、基因表达水平存在相关性（P<0.05或P<0.01），胶质瘤组织中多个GPX亚型存在单核苷酸变异和拷贝数变异；不同类型胶质瘤组织的免疫细胞和肿瘤细胞中主要表达的GPX亚型有明显不同，在胶质瘤组织中GPX1、4、7、8均呈高表达（均P<0.05）且与胶质瘤患者预后不良相关（P<0.01）。qPCR法、WB法检测中国人胶质瘤组织中GPX7、8均呈高表达验证了数据库信息的正确性。在胶质瘤中GPX7、8表达具有独立预后预测价值；富集分析显示GPX7、8与胶质瘤细胞周期和免疫途径有关，在GBM和LGG中GPX8表达与免疫评分呈明显相关（P<0.01）、GPX8可能在胶质瘤中诱导抑制性免疫细胞浸润导致免疫抑制、GPX8表达与胶质瘤中多个免疫检查点分子表达正相关（均P<0.01）、GPX8表达与化疗药物IC50呈明显正相关（均P<0.01）且其高表达可导致胶质瘤对化疗药物的耐药。结论：GPX8在胶质瘤中呈显著高表达，GPX8高表达能诱导胶质瘤中抑制性免疫细胞的浸润其与多个免疫抑制点、与多个化疗药物IC50和患者预后密切相关，可作为胶质瘤免疫治疗的潜在靶点。