沉默Sam68基因对Jurkat细胞增殖影响的研究

本研究探讨Sam68基因对人急性T淋巴细胞白血病细胞Jurkat增殖的影响.针对Sam68 mRNA 531-552靶位点设计并合成shRNA,构建pLKO-Tet-On条件性真核干扰载体,制备慢病毒并感染Jurkat细胞;应用强力霉素（Doxycycline）诱导干扰载体表达,用Real-time PCR和Western blot验证干扰效率,用改良MTT法检测沉默Sam68基因对Jurkat细胞活力的影响,用体外细胞集落形成实验观察沉默Sam68基因对细胞集落形成能力的影响,用流式细胞术分析沉默Sam68前后细胞周期的变化.结果表明：与对照组相比,实验组Sam68基因的表达被有效抑制（P＜0.05）;沉默Sam68基因降低了Jurkat细胞活力,抑制了细胞的集落形成能力并且导致S期细胞比例显著增加,G2期细胞比例显著降低（P＜0.05）.结论：利用shRNA靶向干扰Sam68基因的表达可以有效抑制人急性T淋巴细胞白血病Jurkat细胞的增殖.

Effects of Sam68 Gene Silence on Proliferation of Acute T Lymphoblastic Leukemia Cell Line Jurkat

This study was purposed to investigate the effect of Sam68 gene silence on proliferation of human acute T lymphoblastic leukemia cell line Jurkat. The sequence of shRNA targeting the site 531 - 552 of Sam68 mRNA was designed and chemically synthesized, then a single-vector lentiviral, Tet-inducible shRNA-Sam68 system （pLKO-Tet- On） was constructed; next the Jurkat cells were infected with lentivirus to create stable cell clones with regulatable Sam68 gene expression. The inhibitory efficiency of Sam68 gene was assayed by Real-time PCR and Western blot; the cell activity of Jurkat cells was detected with MTF assay; the change of colony forming potential of Jurkat cells was analyzed by colony forming test; the cell cycle distribution was tested by flow cytometry. The results indicated that the expression of Sam68 in experimental cells was statistically decreased as compared with that of the control cells ; the cells activity and colony forming capacity of the Jurkat cells with Sam68 gene silence were significantly inhibited; with Sam68 gene silencing, the percentage of S phase cells was significantly increased, while the percentage of G2 phase cells was significantly decreased. It is concluded that the silencing Sam68 gene using shRNA interference can effectively inhibit the proliferation of human acute T lymphoblastic leukemia cell line Jurkat.