抑癌基因Fhit重组腺病毒的构建表达及其在结肠癌细胞中的生物学功能

目的：构建携带抑癌基因Fhit的重组腺病毒并通过其研究Fhit蛋白对结直肠癌细胞增殖能力的影响。方法：利用PCR方法从人胎肝文库中克隆Fhit基因片段，Fhit基因PCR产物连入T载体构建重组质粒pMD18T-Fhit。测序正确后，将基因片段导入ptrack-CMV穿梭质粒中，构建重组穿梭载体ptrack-CMV-Fhit。将经PmeⅠ 单酶切线性化的ptrack-CMV-Fhit和骨架腺病毒质粒pAdEasy-1共转BJ5183大肠杆菌，使ptrack-CMV-Fhit和pAdEasy-1发生同源重组。经PacI酶切鉴定正确后,将重组腺病毒质粒转染293A细胞获得表达Fhit蛋白的重组腺病毒rAd-Fhit，将获得的重组腺病毒感染结肠癌细胞，采用蛋白印迹法检测外源Fhit蛋白的表达，并进一步观察其对细胞增殖能力的影响。结果：我们成功构建了携带有Fhit基因的重组腺病毒，且能够在结肠癌细胞中成功表达Fhit蛋白。在结肠癌细胞中，Fhit蛋白明显减弱了结肠癌细胞的增殖能力。结论：在结肠癌细胞中，Fhit基因可能扮演抑癌基因的角色，而表达Fhit的重组腺病毒很可能成为一种结肠癌生物治疗的新策略。

Construction and Expression of Recombinant Adenovirus Encoding Tumor Suppressor Fhit and Its Biological Function in Colon Cancer Cells

AIM:To construct a recombinant adenovirus carrying Fhit gene,a tumor suppressor in many types of cancer,and to observe its biological function on the proliferation of colon cancer cells.METHODS:Fhit gene was cloned from the fetal liver cDNA library using the PCR method.The PCR product was inserted into the T vector to construct the plasmid pMD18T-Fhit.The Fhit fragment from the pMD18T-Fhit was inserted into the vector ptrack-CMV to construct a shuttle plasmid ptrack-CMV-Fhit.After PmeI digested and lineariz...