国家自然科学基金(39630080,39870619,39970338)和上海市教委重点项目基金(B990806)资助项目.
This work was supported by grants from The National Natural Sciences Foundation of China(39630080, 39870619, 39970338) and Key Subject of Shanghai Education Committee (B990806).
为了研究蛋白激酶B(PKB)对上皮钙粘着蛋白(E-cadherin)的调节,使用了用胰岛素处理的野生型SMMC 7721细胞及稳定表达持续激活PKB的SMMC 7721细胞株(Gag-PKB/SMMC 7721).用RNA印迹法和蛋白质印迹法检测细胞E-cadherin 表达,发现通过胰岛素刺激或在细胞中表达持续激活PKB从而增加PKB活性,不影响E-cadherin的转录和蛋白质合成,但用流式细胞术和免疫荧光定位E-cadherin,则发现PKB活性增加能明显驱动E-cadherin到细胞表面,从而导致部分通过E-cadherin途径的细胞粘聚增加和细胞调亡的抑制.因此,我们提供新的证据表明,增加PKB活性可驱动有功能的E-cadherin分子到细胞表面.
In order to study the regulation of E-cadherin by protein kinase B (PKB), wild type SMMC 7721 hepato-carcinoma cells and a Gag-PKB/SMMC 7721 cell line where PKB activity is markedly increased compared with control cells were used. Interestingly, increasing PKB activity via insulin stimulation or Gag-PKB transfection does not enhance the E-cadherin in the level of mRNA and that of protein by using Northern blot and Western blot analysis, but markedly drives E-cadherin protein to cell surface by using flow cytometry analysis and immunofluorescence analysis localization of E-cadherin, which resulted in the increase of cell aggregation and the inhibition of cell apoptosis mostly via E-cadherin. Therefore, new evidences that elevation of PKB activity could drive functional E-cadherin molecule to cell surface are provided.
陈舌,殷祥雷,宗鸿亮,范凯谊,黄传新,顾建新,申宗侯. SMMC 7721肝癌细胞蛋白激酶B活性增高可驱动有功能的上皮钙粘着蛋白到细胞表面(英)[J].生物化学与生物物理进展,2003,30(5):715-720
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