【摘要】 信号转导和转录激活因子(STATs,Signaltransducersandactivatorsoftranscription)是JAK-STATs信号途径中一类重要的DNA结合蛋白,其异常表达和活化与多种肿瘤相关。本文研究发现,在肝癌细胞BEL-7402中STAT3具有组成性活性,能够持续地磷酸化,并转移入细胞核中行使功能。同时,我们成功构建了绿色荧光蛋白(GFP)标记的STAT3野生型(WT)/突变体(CYF)融合质粒,将其转入细胞,以荧光素酶报告系统验证了融合蛋白的活性;通过测定绿色荧光为标记的细胞迁移距离的方法证实,过表达野生型STAT3对肝癌细胞系BEL-7402细胞迁移有促进作用,而突变体STAT3能够降低癌细胞的迁移。更多还原

【Abstract】 Signal transducers and activators of transcription (STATs) are key DNA-binding pro- teins in JAK/STATs signal pathway. Aberrant expression and activation of STAT3 have been iden- tified in many kinds of tumors. We report here that constitutive activation of STAT3 was present in BEL-7402 cells. We constructed the fusing genes of STAT3 (wild type/mutant) and GFP to study the function of constitutively activated STAT3 in BEL-7402 cells. By measuring the migra- tion of the cells labeled by GFP-STAT3 (WT/CYF), we proved that overexpression of STAT3 (WT) could augment the migration of BEL-7402 cells, while STAT3(CYF) could decrease the migration.更多还原