LASP-1稳定转染对人结肠癌细胞株SW480细胞增殖及成瘤能力的影响

目的 探讨LIM和SH3蛋白1(LASP-1)对人结直肠癌细胞株体内外增殖能力的影响.方法 用逆转录聚合酶链反应(RT-PCR)和Western blot方法检测LASP-1在结直肠癌细胞株中的表达,筛选LASP-1不/低表达细胞株;将LASP-1 cDNA导入内源性低表达LASP-1基因的人结直肠癌细胞株SW480细胞中,同时构建带绿色荧光蛋白(CFP)的表达载体转染SW480细胞株,G418筛选抗性克降,经鉴定后利用四甲基偶氮唑盐(MTT)法检测LASP-1对细胞体外增殖的影响,通过整体成像系统观察LASP-1对细胞在裸鼠体内成瘤能力及肿瘤生长能力的影响.结果 成功构建pcDNA3-LASP-1和pEGFP-LASP-1表达载体,将其稳定转染低表达LASP-1的SW480细胞中.通过7 d连续比较,LASP-1基因的导入明显促进结直肠癌细胞的体外增殖能力.裸鼠皮下注射携带GFP的稳定细胞系,整体成像观察过表达LASP-1的细胞成瘤能力和肿瘤生长速度均强于对照细胞.结论 LASP-1基因具有促进结直肠癌细胞增殖的能力,可能作为结直肠癌发生过程中一个有价值的指标.

Abstract：

Objective To investigate the effect of LIM and SH3 protein 1 (LASP-1)expression on the proliferative ability of human colorectal cancer cells in vitro and in vivo. Methods RT-PCR and Western blot were used to screen cells of the colorectal cancer cell line with no or with minimal endogenous LASP-1 expression. LASP-1 cDNA with or without GFP was transfected into SW480 colorectal cancer cells with minimal LASP-1 expression. Stable transfectants were established after G418 selection. Cell proliferative capacity was assessed by MTT assay. Tumor growth was visualized by whole-body imaging system. Results pcDNA3-LASP-1 and pEGFP-LASP-1 vectors were successfully constructed and transfected into the SW480 cells. After comparative study for 7 days, LASP-1 over-expression was found capable of enhancing signific antly the proliferation of colorectal cancer cells in vitro. Stable transfectants with GFP expression were inoculated subcutaneously into the nude mice. Tumorigenesis and proliferation ability of LASP-1-overexpressed transfectants were higher than those of the control cells. Conclusion LASP-1 gene expression enhances proliferation of colorectal cancer cells and may serve as a useful marker for colorectal cancer progression.

Impact of LASP-1 expression on proliferation and tumorigenesis of human colorectal cancer cell line SW480

Objective To investigate the effect of LIM and SH3 protein 1 (LASP-1)expression on the proliferative ability of human colorectal cancer cells in vitro and in vivo. Methods RT-PCR and Western blot were used to screen cells of the colorectal cancer cell line with no or with minimal endogenous LASP-1 expression. LASP-1 cDNA with or without GFP was transfected into SW480 colorectal cancer cells with minimal LASP-1 expression. Stable transfectants were established after G418 selection. Cell proliferative capacity was assessed by MTT assay. Tumor growth was visualized by whole-body imaging system. Results pcDNA3-LASP-1 and pEGFP-LASP-1 vectors were successfully constructed and transfected into the SW480 cells. After comparative study for 7 days, LASP-1 over-expression was found capable of enhancing signific antly the proliferation of colorectal cancer cells in vitro. Stable transfectants with GFP expression were inoculated subcutaneously into the nude mice. Tumorigenesis and proliferation ability of LASP-1-overexpressed transfectants were higher than those of the control cells. Conclusion LASP-1 gene expression enhances proliferation of colorectal cancer cells and may serve as a useful marker for colorectal cancer progression.