[关键词]
[摘要]
目的 观察粉防己碱(tetrandrine,Tet)对脂多糖(LPS)诱导RAW264.7细胞炎症模型促炎细胞因子和抗炎细胞因子的影响。方法 LPS(1 μg/mL)刺激生长良好的RAW264.7细胞,建立细胞炎症模型。四甲基偶氮唑盐(MTT)法检测不同浓度Tet对RAW264.7细胞增殖的影响,激光共聚焦显微镜观察Tet对细胞核因子-κB(NF-κB)核转运的作用,酶联免疫吸附试验(ELISA)检测细胞上清中白细胞介素-6(IL-6)、肿瘤坏死因子-α(TNF-α)、白细胞介素-10(IL-10)的变化。结果 当Tet浓度<1 μmol/L时,单独或与1 μg/mL LPS共培养,均对RAW264.7细胞生长无影响;而当Tet浓度>10 μmol/L时,单独或与LPS共培养均表现出明显的细胞生长抑制效应;Tet可使IL-6、TNF-α的释放受到抑制,相反可促进IL-10的表达。激光共聚焦显微镜观察Tet大剂量组细胞核红染的阳性细胞显著减少,以阴性细胞(红染p65亚基主要集中在胞浆部位,使胞浆染色较深,胞核染色较浅,整个细胞成空泡状)为主。结论 Tet可以抑制LPS所致的RAW264.7细胞炎症反应,其抗炎作用与抑制NF-κB活化,进一步减少炎性细胞因子IL-6、TNF-α的产生,并促进抗炎细胞因子IL-10的表达等有关。
[Key word]
[Abstract]
Objective To investigate the effects of tetrandrine (Tet) on expressions of proinflammatory and anti-inflammatory cytokine in lipopolysaccharide(LPS)-stimulated RAW264.7 cells. Methods RAW 264.7 cells were cultured in media containing 1 μg/mL LPS and different doses of Tet. The proliferation of cells was examined by MTT assay, and nuclear translocation of NF-κB was detected and analyzed by the laser scanning confocal microscope (LSCM), and the levels of IL-6, TNF-α , and IL-10 were tested by ELISA. Results Compared with the control group, Tet had no influence on the proliferation of RAW264.7 cells no matter with LPS or not when its concentration lower than 1 μmol/L; But when its concentration higher than 10 μmol/L, Tet significantly inhibited the growth of the cells whether LPS existed or not. Meanwhile, Tet significantly decreased the levels of IL-6, and TNF-α induced by LPS, and upregulated IL-10 in supernatant. At the mean time, results from LSCM showed that in Tet 1 μmol/L group, positive cells (dyeing-red p65 of NF-κB was translocated into nucleuses and made the nuclueses red) decreased siglificantly, while negative cells (dyeing-red p65 of NF-κB was collectted in endochylema and nucleuses became vacant) were predominantly founded. Conclusion Tet has anti-inflammatory effect, which might be mediated by downregulating inflammatory factors IL-6, TNF-α through NF-κB signal pathway as well as increasing levels of anti-inflammatory factor IL-10.
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[基金项目]
国家自然科学基金资助项目(30500463)