CPGL的基因结构及其与肝癌相关性的研究  

Genomic structure of CPGL and its interrelation with liver cancer

作　　者：朱奕奕[1,2] 覃文新[1,2] 李宏年 李锦军[1,2] 周筱梅[1,2] 张萍萍 万大方[1,2] 

机构地区：[1]上海交通大学肿瘤研究所,上海200032 [2]上海市肿瘤研究所癌基因及相关基因国家重点实验室

出　　处：《肿瘤》2003年第4期263-267,共5页Tumor

基　　金：国家重点基础研究发展计划项目 (编号 :G19980 5 12 0 9)

摘　　要：目的　克隆carboxypeptidaseofglutamatelike(CPGL)全长cDNA ,初步探讨它在肝癌发生发展中的作用。 方法　通过5’ RACE方法和RT -PCR验证 ,确定 (CPGL)全长序列 ,根据其全长与人类基因组的比较进而确定基因的染色体定位和其外显子、内含子 ;应用WesternBlot方法检测CPGL在肝癌组织和癌旁组织中的表达 ;细胞克隆形成及生长曲线检测CPGL对肝癌细胞生长的影响。结果　CPGL全长 2 6 16bp ,编码 4 75个氨基酸的蛋白 ,染色体定位于 18q2 2 .3,蛋白产物定位于细胞质中 ,WesternBlot结果发现CPGL在肝癌组织中的表达明显低于癌旁组织。将CPGL转染肝癌细胞系SMMC772 1发现其具有抑制生长的作用。同源比较发现CPGL含有M2 0蛋白酶家族的保守功能域。结论　上述发现表明CPGL是具有潜在抑癌作用的基因。Objective The gene CPGL (carboxypeptidase of glutamate like) was firstly screened out from the cDNA library of human placenta. This report is mainly concentrated on the identification and characteristics of CPGL. Methods By the 5'-RACE, the complete sequence of CPGL was acquired. Computational analysis showed the genomic localization of CPGL and the structure of the gene. Western Blot was used to detect the different expression of the cancerous and the noncancerous liver tissues. Experiments of cell colony formation and cell growth curve were done to observe the effect that CPGL put on the cancer cells. Results The complete length of CPGL is 2616bp, encoding a protein with 475 amino acids. CPGL expressed highly in the human liver, kidney and brain. Western Blot revealed significantly higher expression of CPGL gene in noncancerous liver tissues than that in the HCC (hepatocellular carcinoma) samples. Stable transfection of the gene to the SMMC7721 liver cancer cell line demonstrated a growth inhibitory effect. Through homologous comparison, the CPGL possessed the conservative function of M20 proteinase family. Conclusion In all, the findings suggest a potential role of CPGL as a hepatocellular carcinoma suppressor gene.

关 键 词：肝癌 CPGL基因 M20蛋白酶家族 抑癌作用 

分 类 号：R735.7[医药卫生—肿瘤]