中文摘要：

肺癌耐药是化疗成功的主要障碍，因此肺癌细胞的耐药逆转研究具重要意义。实验通过流式细胞术检测到对5-氟脲嘧啶（5-Fluorouracil，5-FU）耐受的细胞系H460／5-FU中的SP细胞含量较亲本细胞H460明显升高，经丁酸钠诱导分化后，H460／5Fu对5Fu的敏感性增加，表现为细胞存活率降低，细胞凋亡率提高，而且这种改变随着丁酸钠浓度的增加而增强。结果提示丁酸钠具备逆转肺癌耐药细胞系H460／5-FU耐药的能力。

英文摘要：

The drug resistance of lung cancer is a major obstacle to chemotherapy, so it＇s significant to study the drug resistance reversal of lung cancer cells. This experiment detected the content of SP cells in 5-FU-resistant cell line H460/5-FU through flow cytometry, results showed the content of SP cells in H460/5-FU was much more than that in its parental cell H460, after induction of differentiation by sodium butyrate, the cell sensitivity of H460/5-FU to 5-FU increased, the survival of cells decreased, the rate of cell apoptosis increased, and this change enhanced with the concentration increasing of sodium butyrate. These results prompted sodium butyrate had the ability to reverse the drug resistance of drug-resistant lung cancer cell lines H460/5-FU.