摘要
目的探讨鲍曼不动杆菌对喹诺酮类药物的耐药机制。方法收集我院2006年5月—2007年2月不同患者痰培养标本中分离的鲍曼不动杆菌80株,剔除重复菌株用肉汤稀释法测定菌株在环丙沙星、含有不同浓度羟基氰氯苯胺(CCCP)的环丙沙星、亚胺培南-西司他丁的MIC。PCR扩增gyrA基因和parC基因并进行酶切分析,选取部分PCR扩增产物进行测序鉴定。荧光定量PCR方法检测环丙沙星敏感株与耐药株的adeBmRNA表达的相对定量。结果鲍曼不动杆菌对环丙沙星的敏感率为15%,随加入CCCP的浓度增高而增加,并接近亚胺培南的敏感率。PCR限制性片段长度多态性(RFLP)分析显示,58株耐药菌中39株gyrA基因不能被Hinf I酶切,23株praC基因不能被Hinf I酶切,敏感株均能被Hinf I酶切,耐药株中的gyrA和parC基因存在突变。环丙沙星耐药菌株的adeBmRNA表达量明显高于敏感菌株。结论鲍曼不动杆菌对喹诺酮类药物耐药除了与gyrA、praC基因突变有关外,还与主动外排泵基因adeBmRNA过表达有关。
Objective To study the mechanism of quinolones resistance in Acinetobacter baumannii.Methods MICs of ciprofloxacin for 80 isolates from sputum were determined by microbroth dilution with presence of CCCP from May 2006 to February 2007.The gyrA and parC genes were amplified by polymerase chain reaction(PCR) and analyzed by restrict fragment length polymorphism(RFLP).The PCR products were sequenced.The gene expression of adeB mRNA was analyzed by real-time PCR.Results The susceptibility rate of A.baumannii to...
出处
《中国感染与化疗杂志》
CAS
2008年第4期266-270,共5页
Chinese Journal of Infection and Chemotherapy
