JIP抑制鼻咽癌细胞中LMP1诱导的AP-1活性及机理的研究

Inhibitory effect of JIP on AP-1 activity induced by LMP1 in nasopharyngeal carcinoma cells and its mechanism

目的 :探讨鼻咽癌细胞中JIP抑制激活蛋白 1(AP - 1)信号转导途径的分子机制。方法 :用Dox诱导L7(Tet-on -LMP1-HNE2 )细胞表达LMP1,观察AP - 1活性的动力学变化 ,然后用不同浓度的JIP质粒转染L7细胞后 ,观察JIP的表达对LMP1诱导的AP - 1活性的影响 ,并用荧光免疫组化方法观察JIP抑制JNK核移位引起磷酸化的JNK在胞浆中的滞留。结果 :在转染JIP表达质粒 2 4h之后 ,抑制了活化的JNK核移位 ,下调了AP - 1的生物活性。结论 :JIP能够通过抑制磷酸化的JNK核移位 ,从而下调AP - 1活性。

AIM: To investigate the mechanism of the AP-1 signal transduction pathway inhibited by JIP in nasopharyngeal carcinoma cells. METHODS: AP-1 activity was triggered by Dox-induced LMP1 expression in Tet-on-LMP1-HNE 2 cells (L7). The retention of phospho-JNK in the cytoplasm caused by JIP was examined with immunofluroscence assay. RESULTS: 24 h after transfection of L7 cells with the JIP expression plasmid, the translocation of activated JNK was inhibited, which resulted in the retention of phospho-JNK in the cytoplasm and down-regulation of the AP-1 activity. CONCLUSION: JIP down-regulates the activity of AP-1 through the inhibition of the translocation of JNK.