目的研究人白血病K562细胞在幼牛血去蛋白提取物(deproteinized extract of calf blood,DECB)中的生长情况,探讨DECB对白血病细胞生长方面的意义。方法应用形态学、细胞生长曲线绘制、细胞总蛋白质含量测定、流式细胞术对阴性对照组,阳...目的研究人白血病K562细胞在幼牛血去蛋白提取物(deproteinized extract of calf blood,DECB)中的生长情况,探讨DECB对白血病细胞生长方面的意义。方法应用形态学、细胞生长曲线绘制、细胞总蛋白质含量测定、流式细胞术对阴性对照组,阳性对照组和不同浓度的DECB组白血病细胞分别进行检测和观察。结果在DECB的培养基中人白血病K562细胞发生一系列形态学改变。不同浓度的DECB组的细胞数量、生长速度、蛋白质含量和细胞增殖指数较阴性对照组相比都显著增加,其中(0.1～1%)DECB对K562细胞的增殖作用有时间和浓度依赖性,2%和5%DECB随着作用时间的延长,抑制K562细胞的增殖。与阳性对照组相比,不同浓度DECB组细胞数量、生长速度、蛋白质含量、细胞增殖指数均有所下降。在10%CS存在的条件下,加入1%DECB各项指标结果均无显著变化。结论DECB在一定浓度范围内有利于人白血病细胞系K562的生长与增殖。展开更多
The cDNA fragment of human TRAIL (TNF-related apoptosis inducing ligand) was cloned into RevTet-On, a Tetregulated and high-level gene expression system. The gene expression system was constructed in a human leukemic ...The cDNA fragment of human TRAIL (TNF-related apoptosis inducing ligand) was cloned into RevTet-On, a Tetregulated and high-level gene expression system. The gene expression system was constructed in a human leukemic cell line: Jurkat. By using RevTet-On TRAIL gene expression system in Jurkat as a cell model, we studied the influence of TRAIL gene on the changes of cellular apoptosis before and after the TRAIL gene expression, which was induced by adding tetracycline derivative doxycycline (Dox). The results indicated that the cellular apoptosis ratio was largely dependent on the TRAIL gene expression level. Moreover, it was found that the apoptosis-inducing TRAIL could cause significant changes in the biophysical properties of Jurkat cells. The cell surface charge density decreased, the membrane fluidity declined, the elastic coefficients K_I increased, and the proportion of α-helix in membrane protein secondary structure decreased. Thus, the apoptosis-inducing TRAIL gene caused significant changes on the biomechanic properties of Jurkat cells.展开更多
文摘目的研究人白血病K562细胞在幼牛血去蛋白提取物(deproteinized extract of calf blood,DECB)中的生长情况,探讨DECB对白血病细胞生长方面的意义。方法应用形态学、细胞生长曲线绘制、细胞总蛋白质含量测定、流式细胞术对阴性对照组,阳性对照组和不同浓度的DECB组白血病细胞分别进行检测和观察。结果在DECB的培养基中人白血病K562细胞发生一系列形态学改变。不同浓度的DECB组的细胞数量、生长速度、蛋白质含量和细胞增殖指数较阴性对照组相比都显著增加,其中(0.1～1%)DECB对K562细胞的增殖作用有时间和浓度依赖性,2%和5%DECB随着作用时间的延长,抑制K562细胞的增殖。与阳性对照组相比,不同浓度DECB组细胞数量、生长速度、蛋白质含量、细胞增殖指数均有所下降。在10%CS存在的条件下,加入1%DECB各项指标结果均无显著变化。结论DECB在一定浓度范围内有利于人白血病细胞系K562的生长与增殖。
基金This work was supported by The National Natural Science Foundation of China(No.30270355,No.39930110)a Doctoral Funding(No.20010001082).
文摘The cDNA fragment of human TRAIL (TNF-related apoptosis inducing ligand) was cloned into RevTet-On, a Tetregulated and high-level gene expression system. The gene expression system was constructed in a human leukemic cell line: Jurkat. By using RevTet-On TRAIL gene expression system in Jurkat as a cell model, we studied the influence of TRAIL gene on the changes of cellular apoptosis before and after the TRAIL gene expression, which was induced by adding tetracycline derivative doxycycline (Dox). The results indicated that the cellular apoptosis ratio was largely dependent on the TRAIL gene expression level. Moreover, it was found that the apoptosis-inducing TRAIL could cause significant changes in the biophysical properties of Jurkat cells. The cell surface charge density decreased, the membrane fluidity declined, the elastic coefficients K_I increased, and the proportion of α-helix in membrane protein secondary structure decreased. Thus, the apoptosis-inducing TRAIL gene caused significant changes on the biomechanic properties of Jurkat cells.
