Poloxamer 407凝胶上细菌药物敏感性分析

摘要

目的：评价Poloxamer 407（P407）温敏性即型凝胶上细菌药物敏感性。方法采用改良Kirby-Bauer（K-B）纸片法检测9种细菌在P407和M ueller-Hinton（M H ）琼脂培养基上的药物敏感性，同时比较不同抗菌药物在 P407和M H琼脂培养基上的扩散速率；采用SDS-聚丙酰胺凝胶（SDS-PAGE）电泳分析两种培养基上铜绿假单胞菌外膜蛋白的表达情况。结果 P407培养基上的抑菌圈直径普遍较M H琼脂培养基上的小；抗菌药物在这两种培养基上的扩散速率差异无统计学意义（P＞0．05）；铜绿假单胞菌生物膜外膜蛋白的表达与其在P407培养基上生长的表达相似，而与M H琼脂培养基上的表达不同。结论 P407作为一种培养基赋形剂，可用于临床细菌生物膜药物敏感筛选试验中。%Objective To evaluate the antimicrobial susceptibility of bacteria cultured on a Poloxamer 407(P407) thermosensi-tive in-situ gel .Methods The modified Kirby Bauer(K-B) disc diffusion method was adopted to determine the drug susceptibility of 9 kinds of bacterium isolated on the P407 and the Mueller Hinton(MH)agar culture medium, at the same time the diffusion rates of different antibacterial drugs on the P407 and the MH agar culture medium were compared;the sodium dodecylsulfate polyacrylam-ide gel electrophoresis(SDS-PAGE) was adopted to analyze the outer membrane proteins (OMPs) expression of Pseudomonas aeruginosa on these two kinds of culture medium .Results In the antimicrobial susceptibility tests, the inhibition zones on the P407 gel were found to be generally smaller than those on the MH agar.The difference in the diffusion rates of the antibacterial drugs on these two kinds of culture medium had no statistically significant difference (P> 0.05);the OMPs expression of Pseudomonas aeruginosa was similar to its growth expression on the P407 culture medium ,but different from its expression on the MH agar .Con-clusion P407 as an excipient of bacteria culture medium can be used in the screening test of the biofilm antimicrobial susceptibility .