亚抑菌浓度鱼腥草素钠及与红霉素联合对表皮葡萄球菌生物被膜的作用

目的:观察亚抑菌浓度(亚-MIC)的鱼腥草素钠及与红霉素联用对表皮葡萄球菌生物被膜的影响.方法:连续稀释法测定鱼腥草素钠和红霉素对表皮葡萄球菌的MIC；棋盘格法测定鱼腥草素钠和红霉素联用对表皮葡萄球菌悬浮菌的作用；体外构建表皮葡萄球菌生物被膜,XTT递减法评价亚抑菌浓度的鱼腥草素钠及与红霉素联用对表皮葡萄球菌黏附及对生物被膜内细菌代谢的影响；扫描电镜观察亚抑菌浓度下2药单独及联合用药后对表皮葡萄球菌生物被膜形态的影响情况.结果:鱼腥草素钠、红霉素对表皮葡萄球菌的MIC分别为62.5,7.812 5 mg·L-1；1/8MIC鱼腥草素钠、1/2MIC红霉素联用对表皮葡萄球菌悬浮菌的作用为协同,亚抑菌浓度的鱼腥草素钠、红霉素以及二者联用对表皮葡萄球菌生物被膜菌黏附和代谢均有抑制作用,对表皮葡萄球菌牛物被膜的形态有影响.结论:亚抑菌浓度的鱼腥草素钠、红霉素对表皮葡萄球菌牛物被膜有抑制作用；鱼腥草素钠和红霉素联合用药对表皮葡萄球菌悬浮菌和生物被膜的抑制具有协同作用,在对生物被膜菌代谢的抑制和对牛物被膜形态的影响方面效果尤为显著.

Effect of combination of sub-MIC sodium houttuyfonate and erythromycin on biofilm of Staphylococcus epidermidis

Objective: To observe the effect of the combination of sub-MIC sodium houttuyfonate and erythromycin on biofilm of Staphylococcus epidermidis. Method: The serial dilution method was adopted to determine MIC of the combination of sodium houttuyfonate and erythromycin on S. epidermidis; the checkerboard method was used to evaluate the combination of sodium houttuyfonate and erythromycin on suspended bacteria of S.epidermidis; S. epidermidis biofilm was built in vitro, and XTT reduction assay was used to evaluate the effect of the combination of sub-MIC sodium houttuyfonate and erythromycin on the adhesion of S. epidermidis and bacterial metabolism inside the biofilm. Microscope was applied to observe the impact the single administration and combination of the two medicines under sub-MIC on biofilm morphology of S. epidermidis. Result: The MIC of sodium houttuyfonate and erythromycin were 62.5, 7.812 5 mg·L^-1, respectively. The combination of 1/8MIC sodium houttuyfonate and 1/2MIC erythronmycin showed a synergistic effect on S. epidermidis. Sodium houttuyfonate, erythromycin and their combination had an inhibitory effect on the adhesion and metabolism of S. epidermidis biofilm bacteria, and made impact on the morphology of S. epidermidis biofilm. Conclusion: The sub-MIC sodium houttuyfonate and erythromycin have an inhibitory effect on S. epidermidis biofilm. The combination of sodium houttuyfonate and erythromycin shows a synergistic effect in inhibiting suspended bacteria and biofilm of S.epidermidis, particularly in inhibiting the metabolism of S. epidermidis biofilm bacteria and impacting the morphology of biofilm.