目的: Krüppel样因子15(Krüppel-like factor 15,KLF15)参与肿瘤的增殖、侵袭和转移,但在肺腺癌中的表达和作用尚不明确.本研究探索KLF15蛋白在肺腺癌患者中的表达及其临床意义.方法: 收集我院4例肺腺癌组织及匹配的癌旁组织,Western blot分析这些组织中KLF15蛋白表达的差异.同时收集我院72例肺腺癌患者的肿瘤组织标本及临床资料,免疫组织化学染色分析患者肺癌标本中KLF15蛋白的表达,分析其表达与患者临床特征包括预后的关系.另外,采用质粒转染的方法上调肺腺癌A549细胞中KLF15的表达,CCK-8法分析KLF15蛋白对肺腺癌细胞增殖能力的影响.结果: 在4例肺腺癌及匹配的癌旁组织中,肺腺癌组织中KLF15蛋白表明显低于癌旁组织.在72例肺腺癌病理标本中,KLF15蛋白低表达或不表达者53例,占73.6%,KLF15高表达者19例,占26.4%.KLF15蛋白高表达的患者,其5年生存率明显优于KLF15低表达的患者(P<0.01);KLF15蛋白表达与肺腺癌患者的病理分期(P<0.01)及T分期明显相关(P<0.01),KLF15蛋白低表达是肺腺癌患者不良预后的重要危险因素.上调肺腺癌细胞中KLF15蛋白的表达可明显抑制肺腺癌细胞的生长. 结论: KLF15抑制肺腺癌细胞的生长,有望成为肺腺癌患者的治疗靶点和预后分子标志物.%AIM: To explore the clinical significance of Krüpple-like factor 15 (KLF15) protein expression in the patients with lung adenocarcinoma for exploring the therapeutic and prognositic biomarkers of lung cancer.ME-THODS: Four cases of lung adenocarcinoma tissues and matched adjacent tissues were collected from our hospital, and the expression of KLF15 protein in these tissues was analyzed by Western blot.At the same time, 72 cases of archived paraffin-embedded samples and clinical data of the patients with lung adenocarcinoma were also collected.The KLF15 protein expression in the archived paraffin-embedded lung adenocarcinoma samples was detected by immunohistochemical staining.The correlations between KLF15 protein expression and clinical characteristics of the patients including prognosis were also analyzed.In addition, the KLF15 protein was up-regulated in A549 cells, and then the effects of KLF15 protein on the viability of the cells were measured by CCK-8 assay.RESULTS: The protein expression of KLF15 in the 4 cases of lung adenocarcinoma tissues was significantly lower than that in matched paracancerous tissues.Fifty-three cases of lung adenocarcinoma specimens showed low expression or no expression of KLF15 protein in total 72 cases (73.6%).The 5-year survival rate of the patients with high expression of KLF15 protein in their specimens was higher than that of the patients with the low expression of KLF15 protein (P<0.01), and the expression of KLF15 protein was significantly correlated with the pathological staging (P<0.01) and T stage (P<0.01) of the patients with lung adenocarcinoma.Furthermore, the low expression of KLF15 protein was an important poor prognostic indicator of the patients.Up-regulation of KLF15 protein in the A549 cells significantly inhibited the growth of the cells.CONCLUSION: KLF15 inhibits the growth of lung adenocarcinoma cells.It could be used as a therapeutic target and a prognostic biomarker for the patients with lung adenocarcinoma.
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