论文部分内容阅读
目的 探讨川芎嗪(TMP)对PM2.5诱导的大鼠血管平滑肌细胞(VSMC)增殖的影响及作用机制.方法 以PM2.520,200和400 mg·L-1染毒培养VSMC 24 h,MTT法检测VSMC存活,ELISA法检测细胞黏附分子1(VCAM-1)含量,放射免疫分析(RIA)法和硝酸还原酶法分别检测内皮素1(ET-1)和一氧化氮(NO)含量,Western蛋白印迹法检测VSMC中成纤维细胞生长因子受体1(FGFR-1)蛋白表达.分别加入TMP 20,200和2000 mg·L-1及JNK抑制剂SP60012510μmol·L-1检测TMP对PM2.5的干预作用及机制.结果 与正常对照组比较,PM2.5200和400 mg·L-1处理组A570 nm显著升高,VCAM-1和ET-1分泌增加,NO分泌降低,p-JNK及FGFR-1蛋白表达显著增加(P<0.01);PM2.520 mg·L-1处理组上述指标无显著变化.与PM2.5200 mg·L-1处理组比较,PM2.5200 mg·L-1+TMP 200和2000 mg·L-1预处理组A570 nm显著降低,VCAM-1及ET-1分泌降低,NO分泌增加,p-JNK和FGFR-1蛋白表达显著降低(P<0.01);PM2.5200 mg·L-1+TMP 20 mg·L-1预处理组无显著变化.与PM2.5200 mg·L-1+TMP 2000 mg·L-1预处理组比较,PM2.5200 mg·L-1+TMP 2000 mg·L-1+SP60012510μmol·L-1抑制剂组可进一步增强TMP对上述指标的影响(P<0.05,P<0.01).结论 TMP可能通过下调JNK磷酸化,并调节VSMC内FGFR-1蛋白表达及VCAM-1,ET-1和NO含量,抑制PM2.5诱导的VSMC增殖.“,”OBJECTIVE To investigate the inhibitory effect and the possible mechanism of tetra-methylpyrazine (TMP) in preventing vascular smooth muscle cells (VSMCs) proliferation induced by fine particulate matter (PM2.5). METHODS PM2.520, 200 and 400 mg · L-1 was added to VSMCs for 24 h, the survival of VSMCs was measured by MTT assay, the protein levels of p-c-Jun N-terminal kinase (JNK) and fibroblast growth factor receptor-1 (FGFR-1) in the VSMCs were detected by Western blotting, while the levels of vascular cell adhesion molecule-1 (VCAM-1), endothelin-1 (ET-1) and nitric oxide (NO) in the VSMCs were analyzed by ELISA, radioimmunoassay and nitrate reductase method, respec-tively. TMP 20, 200 and 2000 mg·L-1 or a specific inhibitor of JNK SP60012510μmol·L-1 was added into the VSMCs to observe the effect of TMP. RESULTS Compared with the normal control group, PM2.5200 and 400 mg·L-1 significantly increased the A570 nm vaule, the protein levels of p-JNK and FGFR-1,the levels of VCAM-1 and ET-1, but decreased the level of NO (P<0.01), while there were no significant changes in PM2.520 mg·L-1 group. Compared with the PM2.5200 mg·L-1 group, TMP 200 and 2000 mg·L-1 pre-treatment markedly decreased the A570 nm vaule, the protein levels of p-JNK and FGFR-1, the levels of VCAM-1 and ET-1, but increased the level of NO (P<0.01), while there were no significant changes in TMP 20 mg · L-1 pre-treated group. Moreover, the effects of TMP were significantly enhanced by the co-incubation of TMP 2000 mg · L-1 with SP60012510 μmol · L-1, compared to the TMP 2000 mg · L-1 pre-treated group (P<0.05, P<0.01). CONCLUSION TMP displays a significant inhibitory effect against VSMC proliferation induced by PM2.5. The mechanism may be related to the inhibition of JNK phosphor-ylation, and the regulation of FGFR-1 protein expression and VCAM-1, ET-1 and NO levels.