大肠癌中Beclin1、LC3和mTOR的表达及意义  

Expression of Beclin1,LC3 and m TOR and their significance in colorectal carcinoma

作　　者：吴淑华[1] 胡金龙[1] 何双[1] 温菲菲 孙晨博 田东[1] 

机构地区：[1]滨州医学院附属医院病理科,滨州256603

出　　处：《临床与实验病理学杂志》2014年第12期1333-1338,共6页Chinese Journal of Clinical and Experimental Pathology

基　　金：山东省科技发展计划项目(2010GSF10259)

摘　　要：目的探讨Beclin1、LC3和m TOR在大肠癌中的表达及意义。方法采用免疫组化En Vision法、Western blot和RT-PCR技术检测Beclin1、LC3和m TOR在大肠癌中的表达,并结合临床病理因素进行分析。结果 Beclin1、LC3和m TOR在大肠癌中的阳性率分别为90.50%、87.19%和46.28%,均明显高于癌旁组织(P<0.05),且LC3蛋白在中+低分化大肠癌中的表达(91.34%、89.58%)高于高分化大肠癌(77.61%),在有淋巴结转移组的表达(95.41%)高于无淋巴结转移组(80.45%),m TOR在有淋巴结转移组的表达(57.80%)高于无淋巴结转移组(35.33%)(P<0.05),Beclin1过表达与大肠癌分化程度和淋巴结转移均无关(P>0.05)。LC3与Beclin1在大肠癌中表达呈正相关(rs=0.593,P<0.01),与m TOR表达呈负相关(rs=-0.165,P<0.01),Beclin1和m TOR表达之间无明显相关性(P>0.05)。Kaplan-Meier生存分析显示,Beclin1和LC3均阳性、m TOR阴性、无淋巴结转移的大肠癌患者5年生存率高于Beclin1和LC3均阴性、m TOR阳性及有淋巴结转移的患者。多因素分析显示,LC3、m TOR和淋巴结转移是影响大肠癌预后的独立因素。RT-PCR和Western blot检测结果显示:Beclin1、LC3和m TOR mRNA和蛋白表达水平均明显高于癌旁组织(P<0.05)。结论自噬相关基因Beclin1、LC3和m TOR的异常表达可能与大肠癌的发生、发展及预后相关;联合检测Beclin1、LC3和m TOR在大肠癌中的表达有助于评估进展程度和预后判断。Purpose To investigate the expression of Beclin1, LC3 and mTOR in colorectal cancer （ CRC） and their significance. Methods Immunohistochemistry, Western blot and real-time PCR were employed to detect the expression of Beclin1, LC3 and mTOR in CRC. Results The positive expression rate of Beclin1, LC3 and mTOR in 242 cases of CRC was 90. 50%, 87. 19% and 46. 28%, respectively, which were higher than that in adjacent tissues （ P〈0. 05 ） . Moreover, the expression of LC3 in moderately and poorly differentiated CRC was higher than that in well differentiated CRC, and the positive rate of LC3 in CRC with lymph node metastasis was higher than that in CRC without lymph node metastasis. The overexpression of mTOR was related to lymph node metasta-sis （P〈0. 05）, but both differentiation degree and lymph node metastasis were not associated with Beclin1 （P〉0. 05）. The expres-sion of LC3 was positively correlated with Beclin1 and negatively correlated with mTOR in colorectal cancer （rs =0. 593, P〈0. 01, rs= -0. 165, P〈0. 01）, and the expression of Beclin1 was not associated with mTOR （P〉0. 05）. Kaplan-Meier survival analysis re-vealed that the five-year survival rate of patients without nodal metastasis, positive expression of Beclin1, LC3 and negative expression of mTOR was higher than those with nodal metastasis, negative expression of Beclin1 and LC3, and positive expression of mTOR. Cox survival analysis results revealed that LC3, mTOR and lymphnode metastasis were independent prognostic factors. The results of IHC, real-time PCR and Western blot in fresh CRC tissues indicated that the expression of Beclin1, LC3 and mTOR in colorectal cancer was significantly higher than that in adjacent tissues （P〈0. 05）. Conclusions The aberrant expression of Beclin1, LC3 and mTOR may be associated with the development and progression of colorectal cancer. The simultaneous detection of Beclin1, LC3 and mTOR genes in colorectal cancer may be helpful for the evaluation of the progressive degree an

关 键 词：大肠肿瘤 BECLIN1 LC3 预后 

分 类 号：R735.34[医药卫生—肿瘤]