目的:研究设计合成新的大黄素衍生物E19对慢性髓系白血病细胞株K562及耐伊马替尼的K562细胞株K562/G01的增殖、凋亡的影响,探讨其作用的机制。方法:采用MTT比色法、细胞集落形成实验观察E19对K562、K562/G01细胞增殖的影响;应用DAPI染...目的:研究设计合成新的大黄素衍生物E19对慢性髓系白血病细胞株K562及耐伊马替尼的K562细胞株K562/G01的增殖、凋亡的影响,探讨其作用的机制。方法:采用MTT比色法、细胞集落形成实验观察E19对K562、K562/G01细胞增殖的影响;应用DAPI染色法和DNA片段化检E19诱导细胞凋亡的作用;Western blot检测E19作用后不同时间段p210^(Ber-Abl)和p-P210^(Bcr-Abl)蛋白的变化。结果:大黄素衍生物E19对K562和K562/G01细胞有明显的抑制增殖、诱导凋亡的作用,K562细胞48 h半数抑制浓度(IC_(50))为(1.20±0.19)μmol/L,K562/G01细胞48 h IC_(50)为(1.22±0.16)μmol/L;DNA片段化检测证实,E19对细胞抑制作用呈量效关系;E19作用于细胞后,P210^(Bcr-Abl)和p-P210^(Bcr-Abl)表达水平均有不同程度下调,并呈量效和时效关系。结论:大黄素衍生物E19能有效抑制K562和K562/G01细胞的增殖并诱导它们凋亡,而P210^(Bcr-Abl)和p-P210^(Bcr-Abl)的活化受抑制在其中发挥重要的作用。展开更多
HRONIC myeloid leukemia （CML） is characterized by the presence of the BCR/ABL fusion gene, which is the result of a reciprocal translo cation between chromosomes 9 and 22, calledPhiladelphia （Ph） chromosome. Imati...HRONIC myeloid leukemia （CML） is characterized by the presence of the BCR/ABL fusion gene, which is the result of a reciprocal translo cation between chromosomes 9 and 22, calledPhiladelphia （Ph） chromosome. Imatinib mesylate （imatinib）, a specific small molecular inhibitor of BCR/ABL, could improve the prognosis of CML and is now the standard drug applied in all phases of this disease} Despite the efficacy of imatinib, the development of resistance and the persistence of minimal residual disease have seriously impaired the efficiency of this medicine. Resistance may develop through several different mechanisms, such as mutations in the Abl kinase domain, BCR/ABL overexpression, or compensatory phosphatidylinositol 3 kinase （PI3K）/Akt/ mammalian target of rapamycin （mTOR） activation.2,3 Rapamycin, with mTOR as a potential therapeutic target, has been studied in patients with hematologic malignancies. Here we report a case of refractory CML myeloid blast crisissuccessfully treated by the combination of rapamycin and imatinib.展开更多
文摘目的:研究设计合成新的大黄素衍生物E19对慢性髓系白血病细胞株K562及耐伊马替尼的K562细胞株K562/G01的增殖、凋亡的影响,探讨其作用的机制。方法:采用MTT比色法、细胞集落形成实验观察E19对K562、K562/G01细胞增殖的影响;应用DAPI染色法和DNA片段化检E19诱导细胞凋亡的作用;Western blot检测E19作用后不同时间段p210^(Ber-Abl)和p-P210^(Bcr-Abl)蛋白的变化。结果:大黄素衍生物E19对K562和K562/G01细胞有明显的抑制增殖、诱导凋亡的作用,K562细胞48 h半数抑制浓度(IC_(50))为(1.20±0.19)μmol/L,K562/G01细胞48 h IC_(50)为(1.22±0.16)μmol/L;DNA片段化检测证实,E19对细胞抑制作用呈量效关系;E19作用于细胞后,P210^(Bcr-Abl)和p-P210^(Bcr-Abl)表达水平均有不同程度下调,并呈量效和时效关系。结论:大黄素衍生物E19能有效抑制K562和K562/G01细胞的增殖并诱导它们凋亡,而P210^(Bcr-Abl)和p-P210^(Bcr-Abl)的活化受抑制在其中发挥重要的作用。
基金Supported by Key Provincial Talents Program of Jiangsu(H201126)the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)
文摘HRONIC myeloid leukemia （CML） is characterized by the presence of the BCR/ABL fusion gene, which is the result of a reciprocal translo cation between chromosomes 9 and 22, calledPhiladelphia （Ph） chromosome. Imatinib mesylate （imatinib）, a specific small molecular inhibitor of BCR/ABL, could improve the prognosis of CML and is now the standard drug applied in all phases of this disease} Despite the efficacy of imatinib, the development of resistance and the persistence of minimal residual disease have seriously impaired the efficiency of this medicine. Resistance may develop through several different mechanisms, such as mutations in the Abl kinase domain, BCR/ABL overexpression, or compensatory phosphatidylinositol 3 kinase （PI3K）/Akt/ mammalian target of rapamycin （mTOR） activation.2,3 Rapamycin, with mTOR as a potential therapeutic target, has been studied in patients with hematologic malignancies. Here we report a case of refractory CML myeloid blast crisissuccessfully treated by the combination of rapamycin and imatinib.
