克拉霉素/氟罗沙星对铜绿假单胞菌生物被膜体外作用研究

Effects of Clarithromycin and Fleroxacin on Pseudomonas Aeruginosa Biofilm in Vitro

目的 :探讨克拉霉素和氟罗沙星对铜绿假单胞菌 (PA)生物被膜的影响。方法 :选取临床分离的呼吸道PA7株 ,用平板法培养细菌生物被膜 ,银染色法鉴定 ;微量稀释法检测克拉霉素和氟罗沙星对PA的最低抑菌浓度(MIC) ;噻唑兰法测定活菌数 ;结晶紫染色法观察不同浓度药物对PA粘附性的影响。结果 :1/16MIC、1/4MIC克拉霉素可减少细菌对硅胶膜粘附(P<0 05) ,且可显著增强1/4MIC、1/2MIC的氟罗沙星对铜绿假单胞菌生物被膜的抑菌活性 (F=20 193 ,P<0 01)。结论

OBJECTIVE:To observe the effects of clarithromycin and fleroxacin on Pseudomonas aeruginosa(PA) biofilm METHODS:Clinical isolates of 7 strains of PA from respiratory tract were cultured with modified plate culture method;bacterial biofilm model was identified by silver nitrate staining;MICs were determined by broth microdilution The number of viable bacteria in biofilm was measured by using MTT method and bacterial adherence was measured by crystal violet staining RESULTS:1/16MIC and 1/4MIC of clarithromycin could inhibit the adherence of PA to silica-gel film(P<0 05)and significantly enhance the bacteriostatic effect of 1/4MIC and 1/2MIC of fleroxacin on PA in biofilm(F=20 193,P<0 01) CONCLUSION:There are synergetic effects against biofilm PA when clarithromycin is combined with fleroxacin in vitro