酪氨酸激酶在TNF-α诱导类风湿关节炎成纤维样滑膜细胞MAPKs活化中的作用

被引:4
作者
孙铁铮
吕厚山
药立波
张育军
机构
[1] 北京大学人民医院骨关节病诊疗研究中心
[2] 第四军医大学生化系
关键词
关节炎; 成纤维细胞; 酪氨酸激酶; 肿瘤坏死因子α; 丝裂原活化蛋白激酶;
D O I
暂无
中图分类号
R593.22 [类风湿性关节炎];
学科分类号
摘要
目的 研究在类风湿关节炎成纤维样滑膜细胞 (RAFLS)信号转导中 ,酪氨酸激酶在TNF α刺激下丝裂原活化蛋白激酶 (mitogen activatedproteinkinases ,MAPKs)活化中的作用。方法 原代培养类风湿关节炎成纤维样滑膜细胞。应用Westernblot检测TNF α短时间内引起RAFLS蛋白质酪氨酸磷酸化状态改变 ,及其对MAPKs家族成员活化的浓度效应和时相特点 ;并应用genistein ,酪氨酸激酶 (PTK)抑制剂观察对MAPKs活化的抑制情况。结果 TNF α可以瞬时引起RAFLS蛋白质酪氨酸磷酸化程度增加 ;并在短时间内激活MAPKs通路 (ERK2、JNK2、P38)。不同浓度梯度TNF α作用显示 :10IU/ml时对ERK2、JNK2即可达到峰值活化 ,10 0IU/ml时P38达到最大活化。时间上 ,ERK2、JNK2、P38的活化分别在TNF α作用后 5min、15min、15min最明显 ;genistein对TNF α诱导的ERK2活化抑制作用显著 ,而对于JNK2、P38的抑制则较弱。结论 TNF α在RAFLS信号转导中 ,可以瞬时导致蛋白质酪氨酸磷酸化程度增加 ,并同时激活MAPKs 3条通路 ,但是对MAPKs 3个亚家族成员的活化具有异质性 ;PTK在TNF α导致ERK活化中发挥作用 ,对JNK、P38活化无明显影响
引用
收藏
页码:74 / 78
页数:5
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