摘要
本研究比较新型的酪氨酸激酶抑制剂HHGV678与伊马替尼(imatinib,IM)在体外对Bcr-Abl野生型和IM耐药细胞株的抑制作用,探索HHGV678替代IM治疗CML及IM耐药CML患者的可能性。以Bcr-Abl野生型细胞株(K562和32Dp210)及16种IM耐药细胞株(K562R和15种Bcr-Abl点突变细胞株)为研究对象,用MTT法检测HHGV678和IM对上述细胞的生长抑制作用;以DNA梯形条带法和Annexin-V/PI双染色流式细胞术检测细胞凋亡;应用Western blot检测HHGV678对上述细胞BCR-ABL融合蛋白及酪氨酸激酶磷酸化表达的影响。结果表明:HHGV678呈剂量依赖性显著抑制Bcr-Abl野生型细胞株和除T315I点突变细胞株以外的IM耐药细胞株生长。比较IC50发现,HHGV678在低剂量下(0.01-0.3μmol/L)抑制K562和32Dp210细胞生长的作用比IM分别强15.5和28倍;而对除T315I点突变细胞株以外的15种IM耐药细胞株细胞的生长抑制作用比IM强1.4-124.3倍。HHGV678抑制上述细胞酪氨酸激酶磷酸化的能力均强于IM。更重要的是HHGV678在10.0μmol/L剂量下诱导IM强耐药细胞株K562R和T315I点突变细胞株的凋亡率分别达到40.06%和33.32%,显著高于IM的19.77%和10.68%。结论:新型酪氨酸激酶抑制剂HHGV678对Bcr-Abl野生型细胞株和IM耐药细胞株,尤其是对IM强耐药细胞株的生长抑制作用明显强于IM,但HHGV678能否成为治疗CML和IM耐药CML患者新的靶向药物,仍有待进一步的研究。
This study was aimed to compare HHGV678 with imatinib （IM） in growth inhibition of Bcr-Abl wild type and IM-resistant cell lines, investigate the possibility of replacing IM with HHGV678 in treatment of chronic myeloid leukemia （ CML ） and IM-resistant CML patients. Viability of two Bcr-Abl wild type cell lines （ K562 and 32Dp210） and 16 IM-resistant cell lines （K562R and 15 Bcr-Abl point mutant cell lines） treated with HHGV678 and IM was analyzed by MTT. The apoptosis of those cells was identified by flow cytometry with Annexin V staining and DNA ladder analysis. Western blot was applied for detecting the expression of Bcr-Abl and phosphotyrosine protein levels. The results indicated that HHGV678 significantly inhibited the growth of two Bcr-Abl wild types and IM-resistant cell lines in dose-dependent manner except cell line of T315I point mutant. IC50 results showed that the growth inhibition of HHGV678 was 15.5 and 28-fold higher than that of IM in K562, 32Dp210 and 1.4 to 124.3-fold higher than that of IM in 15 IM-resistant cell lines respectively. Compared with IM, HHGV678 more significantly inhibited phosphotyrosine kinase protein of the cells mentioned above at different concentrations. With most importance, HHGV678 of 10.0 μmol/ L induced cell apoptosis of 40.06% and 33.32% in K562R and 32Dp210T315I cell lines, which were much higher than that of IM （ 19.77% and 10.68% ）. It is concluded that HHGV678 is more effective than IM in the growth inhibition of Bcr-Abl wild type cell lines and IM-resistant cell lines, especially in strongest IM-resistant cell lines. Further studies are needed to show whether HHGV678 may be a novel targeting drug in treatment of CML and IM-resistant CML patients.
出处
《中国实验血液学杂志》
CAS
CSCD
2008年第5期1039-1043,共5页
Journal of Experimental Hematology
