目的：探讨外膜孔道蛋白38（Omp38）在鲍曼不动杆菌对β-内酰胺类抗菌药物耐药中的作用。方法前期通过体外诱导试验获得1株鲍曼不动杆菌基因 Omp38缺失突变株，应用回补试验验证突变基因的作用；采用流式细胞术检测菌株细胞膜电位变化；通过测量菌株的相对生长率评估突变基因的适应性代价。结果 Omp38被证实涉及降低鲍曼不动杆菌对β-内酰胺类抗菌药物的敏感性；Omp38降低鲍曼不动杆菌膜电位并具有约3%的适应性代价（P<0.05）。结论 Omp38在鲍曼不动杆菌对β-内酰胺类抗菌药物耐药过程中发挥重要作用；Omp38微弱的适应性代价可能是鲍曼不动杆菌对β-内酰胺类抗菌药物耐药的重要原因。%Objective To investigate the influence of outer membrane protein 38(Omp38)on the susceptibility of beta-lactam antibiotic in Acinetobacter baumannii. Methods The isolate with Omp38 deletion was induced by in vitro experiment. The contribution of mutation to beta-lactam antibiotic susceptibility was validated by complementation experiment. The cell membrane potential change of isolates was determined by flow cytometry. The growth rates were determined in order to evaluate mutant gene fitness cost. Results The Omp38 was confirmed to be correlated with the decreased beta-lactam antibiotic susceptibility. The Omp38 decreased cell membrane potential,and the fitness cost of Omp38 was approximately 3% through measuring growth rates(P< 0.05). Conclusions Omp38 is deemed to play an important role in beta-lactam antibiotic resistance in Acinetobacter baumannii. The minor fitness cost of Omp38 may be a significant reason for the development of beta-lactam antibiotic resistance in Acinetobacter baumannii.
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