人APL细胞株NB4不同二维电泳条件对电泳结果的影响

Influence of Different Conditions on Two-Dimensional Gel Electrophoresis of Proteins from Human Acute Promyelocytic Leukemia Cell Line NB4

本研究探讨不同二维电泳条件对人急性早幼粒细胞性白血病 (APL)细胞株NB4二维电泳结果的影响。选用 2 4cm ,pH3- 10L的固定 pH梯度 (immobilizedpHgradient,IPG)胶条 ,用IPGphor进行第一相等电聚焦 ,然后用EttanDaltII垂直电泳系统进行第二相SDS PAGE ,银染后用ImageMaster 2DElite软件进行分析。结果表明 :采用低离子强度的缓冲液冲洗收集样品可以提高等电聚焦效果。裂解液中 7mol/L尿素、4 0mmol/LDTT能溶解NB4细胞大部分蛋白质 ,而水化液中硫脲与尿素合用可以明显增加碱性端中低分子量区可分辨的蛋白质点。NB4细胞用 2 4cm ,pH3- 10L的IPG胶条进行二维电泳时 ,10 0 μg左右的上样量、6 32 0 0V小时左右的等电聚焦时间是恰当的。结论 :APL细胞的蛋白质种类繁多 ,受多种因素影响 ,正确选择样品制备方法和二维电泳条件十分重要。

The aim of this study was to explore the effect of different conditions on two-dimensional gel electrophoresis of proteins from human acute promyelocytic leukemia cell line NB4. The 24 cm pH 3-10 linear immobilized pH gradient (IPG) strips were chosen,the isoelectric focusing was carried out by using IPGphor. Then,the second-dimensional SDS-PAGE was performed. After silver staining,the gel was analyzed by ImageMaster 2D Elite. The results showed that low ion intensity sample washing buffer improved the performance of isoelectric focusing. The lysis buffer containing 7 mol/L urea and 40 mmol/L DTT could solubilize the most proteins from NB4 cell line. The rehydration solution containing thiourea and urea increased the low molecular weight protein points to be resolved in the area of basic end. The reasonable sample load and Volt/hour of NB4 were about 100 μg and 63 200 V/h for the 24 cm pH 3-10 IPG strips. It is concluded that the proteins from NB4 and similar cell line are complicated and affected by many factors,so that,it is very important to select the right methods for sample preparation and the conditions of two-dimensional gel electrophoresis.