APE1、VEGF在非小细胞肺癌组织中的表达及其与预后的关系
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摘要
目的:
     肺癌是人类最常见的恶性肿瘤之一,居所有恶性肿瘤死因的首位,其中超过80%是非小细胞肺癌(non-small cell lung cancer, NSCLC)。近年来,随着基础医学相关方面的发展,运用免疫学及分了生物学方面的新技术在该领域已取得了长足的进步。APE1、VEGF的发现及在肿瘤研究方面的运用,正是这类的体现。人类脱嘌呤核酸内切酶1(apyrimidinic endonuclease 1, APE1)是一种广泛存在于生物体中的多功能核蛋白,它在DNA的碱基切除修复、对转录因子的氧化还原调控和活性氧簇的调控等多个重要的生物学过程中发挥着主要的作用。血管内皮生长因子(vascular endothelial growth factor,VEGF)是肿瘤血管生成中最重要的促血管生成因子,它选择性促使血管内皮细胞进行有丝分裂、刺激内皮细胞增殖,从而促进血管生成;同时,它能增加血管、尤其是微血管的渗透性,使血浆大分子外渗。APE1能调控的多种转录因子包括p53、HIF-α、NF-κB、Fos/Jun(AP-1)等,其中HIF-a通过VEGF依赖途径和’VEGF非依赖途径影响血管生成。本文通过研究APE1和VEGF在非小细胞肺癌中的表达特征,探讨它们的表达与非小细胞肺癌临床病理因素以及与非小细胞肺癌预后的关系。
     方法:
     本实验收集2004年1月-2005年1月于天津医科大学附属肿瘤医院和武警医学院附属医院接受手术的78例非小细胞肺癌患者的临床资料进行分析,同时收集30例正常肺组织作为对照。采用免疫组织化学SABC法检测78例有完整蜡块标本的患者中APE1、VEGF的表达情况,血管内皮特异标记物CD34标记并计数肿瘤微血管密度(microvessel density,MVD)。应用SPSS17.0统计软件包进行数据处理。
     结果:
     1.APE1在所有非小细胞肺癌和正常肺组织都有表达,但是其定位有所不同:APE1主要在肺癌细胞的细胞质表达,78例非小细胞肺癌组织中61例(78.2%)呈高表达,17例(21.8%)呈低表达。而APE1在30例正常肺组织中表达较弱,表达率较低6.7%(2/30)。
     2.VEGF主要表达于非小细胞肺癌细胞的细胞质,78例非小细胞肺癌组织中50例(64.1%)呈高表达,17例(35.9%)呈低表达。而在30例正常肺组织中无VEGF的表达。
     3.APE1表达与吸烟、淋巴结转移关系密切;VEGF表达与肿瘤大小、分化程度和淋巴结转移关系密切;MVD值与肿瘤大小和淋巴结转移关系密切。
     4.Kaplan-Meier生存分析显示:肿瘤大小、淋巴结转移、APE1表达及VEGF表达与生存率之间均呈负相关(P<0.01); COX回归模型分析显示:肿瘤大小、淋巴结转移和APE1表达是影响非小细胞肺癌患者生存率的独立危险因素。
     5.APE1、VEGF表达和MVD计数之间存在相关性。
     结论:
     1.APE1在NSCLC组织表达增强明显高于正常肺组织,表明APE1可能参与了NSCLC的发生。APE1表达与肺癌淋巴结转移有关,表明APE1可能参与了NSCLC的转移。APE1是影响非小细胞肺癌患者生存率的独立危险因素,表明APE1对判断NSCLC的转移和预后有一定帮助。
     2.VEGF在NSCLC组织中的表达与肿瘤大小、分化程度和淋巴结转移有关。VEGF也可作为评价肺癌预后的指标。提示VEGF的表达增强与NSCLC的浸润性发展有密切关系。
     3.NSCLC组织APE1及VEGF高表达组MVD值均高于低表达组,且APE1、VEGF表达显著相关,提示二者直接或间接地参与了肿瘤血管的生成,与肺癌细胞浸润转移有关。
Objective:
     Lung cancer is one of the most common cancer in the world.It is a major course of death form malignant diseases.Over 80 percent is non-small cell lung cancer (NSCLC).Recently,With the development of the immunology and molecular biology,the studies of lung cancer have achieved greatly progresses.The findings and the appliances of APE1(apyrimidinic endonuclease 1) and VEGF(vascular endothelial growth factor) are the signs of these progresses.APE1 is a paradigm of the functional comp lexity of a biological macromoleculel and it plays a central role in DNA base excision repair,redox-dependeent regulation of specific transcrip tional factors and production control of reactive oxygen species.It is also a key enzyme in the base excision repair and in transcriptional modulation against oxidative stress.VEGF takes the major function to stimulate the growth of the tumor and correlated with the tumor's proliferation,invasion and metastasis.Furthermore,VEGF has the function to improve the activity of Endothelial cell's mitosis.APE1 also functions as a major redox-signaling factor to reduce and activate transcription factors such as p53, HIF-a,NF-KB,Fos/Jun(AP-1),and so on.We investigated the altered expression of APE1/ref-1 and VEGF antioxidant systems in lung cancer,to investigate the expression of APE1 and VEGF in NSCLC,and to explore the influence of the two biological factors and other clinical factors on prognosis of NSCLC.
     Methods:
     Clinic data of 78 inpatienit cases in the Tianjin Medical University Cancer Hospital and the Affiliated Hospital of Armed police for Medical College from January 2004 to January 2005,were retrospectively reviewed.Meanwile,we collect 30 cases of normal lung tissue. Expression of APE1,VEGF and MVD of 78 cases was studied by inununohistoehemistry(Strept Avidin-Biotin-enzyme Complex).The data are analyzed by soft ware SPSS 17.00.
     Results:
     1.APE1 expressed both in the NSCLC specimens and in the normal lung tissue,but the location is different.It mainly expressed in cytoplasm in the NSCLC specimens,and mainly localized to nucleus in the normal lung tissue.The positive expression rate of APE1 was 78.2%(61/78) in NSCLC.
     2.VEGF mainly expressed in cytoplasm in the NSCLC specimens.The positive expression rate of VEGF was 64.1%(50/78) in NSCLC.
     3.The Positive expression artes of APE 1 corrlated with the Patinets' and lymph node matastasis;the Positive expression artes of VEGF corrlated with the Patinets'tumer size,differentiation and lymph node matastasis; MVD corrlated with the Patinets'tumer size, and lymph node matastasis.
     4.Kaplan-Meier survival analysis suggested that the survival time was significantly related to turner size,lymph node matastasis,expression of APE1 and VEGF,(P< 0.01).Multivariate COX model analysis indicated that turner size,lymphatic metastasis and APE1 expression may be the independent prognostic factor.
     5.There were significant correlations with the expression of APE1,VEGF and MVD.
     Conclusion:
     1.The expression of APE1 low in the normal lung tissue,but high in lung carainoma;The expression of APE1 closely related to lymph node matastasis.APE1 expression may be the independent prognostic factor,which can be a marker of prognosis evaluation.
     2. The expression of VEGF is closely related to turner size, differentiation and lymph node matastasis, it can evaluate prognosis.
     3.Both APE1 and VEGF expression are positively related to MVD in lung cancer tissues and the close relationships between APE1 and VEGF indieated that they play important roles in the careinogenesis of lung cancer especially in tumor angiogenesis.
引文
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