系统性红斑狼疮小鼠脾细胞中IL-12信号传递途径的研究

目的探讨在狼疮小鼠脾细胞中是否存在IL-12通过Lck/p38/c-jun传递信号及其对脾细胞的影响。方法以慢性移植物抗宿主病(graft versus host disease,GVHD)小鼠为狼疮小鼠模型，分别采用放射自显影、Western blot和Northern blot，检测培养的脾细胞中Lck的活性、p38磷酸化活化及c-jun基因表达的变化。结果狼疮小鼠脾细胞经IL-12刺激后，与正常对照组相比较，Lck的活性增高、p38异常活化，c-junmRNA的水平增高。加入Lck抑制剂PP1组Lck的活性及p38磷酸化消失，无c-jun基因的表达；加入p38抑制剂SB203580组亦无p38磷酸化及c-jun基因的表达。结论狼疮小鼠的脾细胞异常，IL-12可通过Lck/p38/c-jun在细胞内传递信号，直接参与免疫损伤。

IL-12 signaling pathway through Lck/ p38 /c-jun in splenocytes from systemic lupus erythematosus mouse

Aim To investigate whether there is IL-12 signaling pathway through lck/p38/c -jun in splenic cells obtained from lupus mouse and its effect on splenic cells. Methods Mice with graft versus host disease were used as lupus nephritis model. Activity of Lck tyrosine kinase, p38 phosphorylation and mRNA expression of c-jun in splenic cells were determined by autoradiography, Western blot and Northern blot, respectively. Results There were higher levels of Lck activity, p38 phosphorylation and c-jun expression of IL-12-stimulated splenic cells from lupus model when compared with that observed in similarly treated splenic cells from normal control. The Lck activity and p38 phosphorylation were almost inhibited by Lck inhibitor PP1, on the other hand, p38 specific inhibitor SB203580 decreased phosphorylation of p38. In addition, expression of c-Jun was also inhibited by PP1 or SB203580 although splenic cells were stimulated with IL-12. Conclusion Aberrant murine splenic call, IL-12-me- diated intracelluar signaling pathway through lck/p38/c-Jun were involved in immunologic damage.