探讨应用siRNA技术下调Bcl-XL对人结肠癌细胞生长的抑制作用。方法:采用人结肠癌细胞株DLD1, 利用人工合成的Bcl-XL靶向小分子干扰RNA(siRNA)转染DLD1细胞,通过Western blot法检测转染细胞Bcl-XL蛋白的表达,流式细胞仪检测处理后细胞的凋亡情况,锥虫蓝染色法计数存活细胞。结果:与空白组和对照组相比,转染Bcl-XL siR- NA组的Bcl-XL蛋白表达显著性下降,凋亡细胞的数量显著增加(P<0．05),细胞存活率显著降低(P<0．05)。结论:Bcl-XL siRNA能显著降低人结肠癌细胞的Bcl-XL蛋白表达,有效抑制细胞的生长,为结肠癌的治疗提供了一种新的治疗策略。

To study the inhibitory effect of a double-strand small interfering RNA targeting Bcl-XL (Bcl-XL siRNA) in human colon cancer cells. Methods: Human colon cancer cell line DLD1 was treated with Bcl-XL siRNA, The protein level of Bcl-XL in the cells was determined by Western blot; the apoptotic ratio and survival condition were detected by flow cytometry assay and trypan blue-stained cell counting with hemocytometer, respectively. Results: The level of Bcl-XL protein in DLD1 cells was obviously down-regulated by Bcl-XL siRNA. The apoptotic ratio was significantly higher in Bcl-XL siRNA treated group than those in control (P<0.05) , whereas the survival rate of cells was significantly decreased in Bcl-XL siRNA group(P <0. 05). Conclusion: Bcl-XL siRNA can effectively knock down the Bcl-XL protein and inhibit the growth of human colon cancer cells, which might be a new way for colon cancer treatment.