佛波酯敏感的PKC介导IL-6上调大鼠血管平滑肌细胞bFGF蛋白表达

Interleukin-6 induced upregulation of basic fibroblast growth factor isoform through phorbol ester-sensitive protein kinase C in rat vascular smooth muscle cells

目的 :观察蛋白激酶C(PKC)途径在白细胞介素 6 (IL - 6 )上调大鼠血管平滑肌细胞 (VSMC)碱性成纤维细胞生长因子 (bFGF)中的作用。方法 :采用大鼠主动脉贴块法培养VSMC ,以佛波醇 12 ,13-二丁酸盐预耗竭细胞内PKC ,Western免疫印迹法观察IL - 6对VSMCbFGF和成纤维细胞生长因子 1型受体蛋白表达的影响。结果 :IL- 6在 0 - 10 0g/L剂量范围内上调bFGF蛋白 ,并呈量效关系 ,表达高峰为 2 4h。细胞内佛波酯敏感的PKC预耗竭后该上调作用显著下降。IL - 6对VSMC成纤维细胞生长因子 1型受体蛋白表达无影响。结论 :IL - 6上调大鼠VSMCbFGF蛋白水平 。

AIM: The role of protein kinase C(PKC) in the effect of Interleukin-6(IL-6) on basic fibroblast growth factor(bFGF) expression was investigated in rat vascular smooth muscle cells(VSMC). METHODS: Western-blotting was adopted to observe the variation of bFGF and its receptor type I isoforms expression. RESULTS: IL-6 increased all the three basic fibroblast growth factor isoforms in a dose-dependent (0-10.0 μg/L) manner. The upregulatory activities peaked at 24 h as demonstrated . In addition, after exhaustion of intracellular phorbol ester-sensitive PKC, the upregulatory effects of IL-6 on bFGF exprssion in VSMC declined ( P <0.01). CONCLUSION: IL-6 increased bFGF expression in a phorbol ester-sensitive PKC-dependent manner in rat VSMC.