长链非编码RNA母系表达基因3对结直肠癌细胞侵袭和迁移能力的影响

目的:检测长链非编码RNA母系表达基因3(maternally expressed gene 3,MEG3)在结直肠癌细胞中的表达,并观察过表达MEG3对结直肠癌细胞侵袭和迁移能力的影响。方法:检测人正常结肠细胞NCM460及结直肠癌细胞SW48、Lo Vo中MEG3的水平,在SW48细胞和Lo Vo细胞中转染MEG3过表达质粒,利用Transwell小室及划痕实验观察过表达MEG3对细胞侵袭和迁移能力的影响,通过Western blotting检测基质金属蛋白酶(matrix metalloproteinase,MMP)家族相关蛋白的变化。结果:结直肠癌细胞SW48和Lo Vo中MEG3的水平明显低于人正常结肠细胞NCM460;在SW48和Lo Vo细胞中过表达MEG3后能够明显抑制细胞的侵袭和迁移能力;Transwell侵袭实验和迁移实验显示MEG3表达组SW48细胞的穿膜数及Lo Vo细胞的穿膜数与对照组比较明显减少。划痕实验中过表达MEG3后细胞间距较对照组明显增大,提示细胞运动能力减弱。同时过表达MEG3可明显降低细胞中MMP-2及MMP-9的表达,增高金属蛋白酶组织抑制物2(tissue inhibitor of metalloproteinase-2,TIMP-2)的表达。结论:结直肠癌细胞中MEG3水平较正常结直肠细胞明显降低;在结直肠癌中过表达MEG3可抑制细胞的侵袭、迁移运动能力,并且可能通过影响TIMP-2、MMP-2及MMP-9的表达发挥上述功能。

Effect of long non-coding RNA MEG3 on invasion and migration of colorectal cancer cells

AIM: To investigate the expression of long non-coding RNA maternally expressed gene 3(MEG3) in colorectal cancer(CRC) cells, and to observe the effect of MEG3 on the invasion and migration of CRC cells. METHODS: The levels of MEG3 in human normal colon cell NCM460 and CRC cells SW48 and LoVo were detected by real- time PCR. MEG3 was over-expressed by plasmid transfection, and the effects of MEG3 on the invasion and migration of SW48 and LoVo cells were analyzed by Transwell assay and wound healing assay. The expression of matrix metalloproteinase(MMP) family proteins was determined by Western blotting. RESULTS: The level of MEG3 was down-regulated in CRC cells compared with normal colon cell NCM460. The invasion and migration of CRC cells were reduced after MEG3 over-expression. Transwell invasion and migration assays showed that the numbers of transmembrane SW48 and LoVo cells were smaller in MEG3 over-expression group than control group(CONCLUSION: The expression of MEG3 is down-regulated in CRC cells. Over-expression of MEG3 inhibits the invasion and migration of CRC cells. TIMP-2, MMP-2 and MMP-9 might play an important role in this regulation.