COX6B2在胃癌组织中高表达并影响患者的远期预后:基于抑制p53信号调控胃癌细胞的增殖及细胞周期

High expression of COX6B2 in gastric cancer is associated with poor long-term prognosis and promotes cell proliferation and cell cycle progression by inhibiting p53 signaling

目的分析COX6B2在胃癌组织中的表达对患者远期预后的影响及其作用机制。方法基于公共数据库、患者病历资料分析COX6B2在胃癌和癌旁组织中表达量及其对患者预后的影响;富集分析COX6B2在胃癌中可能发挥的作用;应用慢病毒转染技术干预COX6B2的表达;通过CCK-8、流式细胞术及免疫印迹实验验证其生物学功能。结果TCGA数据库、免疫组化、免疫印迹和荧光定量PCR检测显示,COX6B2在胃癌组织中高表达(P<0.05);Kaplan-Meier plotter数据库和K-M曲线显示,COX6B2高表达组生存期短(P<0.05);统计分析发现COX6B2在胃癌组织高表达与临床病理分期、CEA及CA19-9密切相关(P<0.05),COX6B2高表达、CEA≥5μg/L及CA19-9≥37 kU/L均是影响患者术后5年生存率的独立危险因素(P<0.05)且COX6B2表达量对患者远期预后有一定预判价值(P<0.05);GO及KEGG富集结果显示,COX6B2主要参与细胞周期的调控等;CCK-8和流式检测显示,上调COX6B2促进细胞增殖,通过增加G1/S期细胞比例调控细胞周期(P<0.05)。免疫印迹结果显示,COX6B2抑制胃癌细胞中p53和p21的表达(P<0.05)。结论COX6B2在胃癌组织中高表达且影响患者远期预后,其可能通过调控细胞周期而影响胃癌恶性增殖的过程。

Objective To investigate the effect of COX6B2 expression in gastric cancer tissues on the patients'long-term prognosis and its underlying mechanism.Methods Based on the public databases and the medical records of patients,we analyzed the expression level of COX6B2 in gastric cancer and adjacent tissues and its influence on long-term prognosis of the patients.Enrichment analysis were used to predict the possible role of COX6B2 in gastric cancer.The effects of lentivirusmediated COX6B2 knockdown on biological behaviors of gastric cancer cells were examined using CCK-8 assay,flow cytometry,and Western blotting.Results TCGA database and the results of immunohistochemistry,Western blotting and realtime PCR all demonstrated a significantly higher expression of COX6B2 in gastric cancer tissues(P<0.05).Kaplan-Meier plotter database and Kaplan-Meier curves showed that the patients with high COX6B2 expression had significantly shorter postoperative survival(P<0.05).A high expression of COX6B2 in gastric cancer tissues was closely correlated with clinicopathologic stage,CEA and CA19-9(P<0.05).A high expression of COX6B2,CEA level≥5μg/L and CA19-9 level≥37 kU/L were independent risk factors affecting postoperative 5-year survival rate of gastric cancer patients(P<0.05),and COX6B2 expression level had a predictive value for long-term prognosis of the patients(P<0.05).GO and KEGG enrichment analyses showed that COX6B2 was mainly involved in the regulation of cell cycle.In the in vitro cell experiment,COX6B2 overexpression significantly promoted gastric cancer cell proliferation,increased the percentage of G1/S phase cells and inhibited the cellular expressions of p53 and p21(P<0.05).Conclusions COX6B2 is highly expressed in gastric cancer and is closely correlated with a poor long-term prognosis of the patients possibly by promoting gastric cancer cell proliferation and regulating cell cycle.