Effect of PTTG1 Expression on Invasion and Migration of Colon Cancer Cell SW480 and Its Possible Mechanism
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摘要:目的
研究垂体肿瘤转化基因 1(pituitary tumor transforming gene 1,PTTG1)过表达促进人结肠癌细胞SW480侵袭和迁移作用及其可能机制。
方法采用脂质体转染法将pcDNA3.1(+)-PTTG1及空载pcDNA3.1(+)转染人结肠癌SW480细胞,G418法筛选阳性克隆。Western blot和Real-time PCR法鉴定稳定过表达PTTG1细胞株建立。Transwell小室法检测细胞侵袭和迁移能力,Western blot检测MMP2、MMP9、E-cadherin、Vimentin和Snail的表达。
结果(1)成功获得稳定高表达PTTG1的SW480克隆细胞株PTTG1-SW480;(2)过表达PTTG1基因后,SW480细胞侵袭和迁移能力增强,MMP2和MMP9表达升高,上皮间质转化(epithelial-mesenchymal transition,EMT)标记分子E-cadherin表达降低,Vimentin和Snail的表达升高,差异均有统计学意义(P<0.01);(3)过表达PTTG1基因后,SW480细胞中PI3K/AKT信号活化增强,使用LY29400干预后,抑制细胞侵袭、迁移和EMT,E-cadherin表达上调、Vimentin和Snail的表达下调,差异均有统计学意义(P<0.01)。
结论PTTG1基因过表达可能通过活化PI3K/AKT信号诱导SW480细胞EMT发生,发挥促进SW480侵袭和迁移作用;提示PTTG1蛋白可能成为结肠癌治疗的一个潜在靶点。
Abstract:ObjectiveTo investigate the effect of over-expression of pituitary tumor transforming gene 1 (PTTG1) on the invasion and migration of human colon cancer cells SW480 and its possible mechanism.
MethodsBoth pcDNA3.1(+)-PTTG1and pcDNA3.1(+) plasmids were separately transfected into human colon cancer cell line SW480 by liposome transfection method and G418 was used to screen positive clones. Real-time PCR and Western blot were used to asses the stably over-expressed PTTG1 in PTTG1-SW480. The abilities of migration and invasion of PTTG1-SW480 cells were assayed by Transwell chambers and Western blot was used to detect the expression of MMP2,MMP9,E-cadherin,Vimentin and Snail.
Results(1) The cloned cells PTTG1-SW480 with PTTG1 over-expression were successfully obtained; (2) After PTTG1 over-expression,the abilities of migration and invasion of SW480 cells were enhanced,the expression of MMP2 and MMP9 were up-regulated,Vimentin and Snail expression were up-regulated,and E-cadherin expression was down-regulated (all P<0.01) ; (3) The signaling pathway of PI3K/AKT activation was enhanced in PTTG1-SW480 cells. Interfering with LY29400,the abilities of migration and invasion and EMT of PTTG1-SW480 cells were prevented,the expression of E-cadherin was up-regulated and Vimentin and Snail expression were down-regulated (all P<0.01) .
ConclusionPTTG1 over-expression may promote SW480 cells migration and invasion through activating PI3K/AKT pathway to induce EMT. PTTG1 may become a potential target for colon cancer treatment.
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Key words:
- PTTG1 /
- Colon cancer /
- Invasion /
- Migration
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