Antibiotic resistance is a growing problem worldwide. For this reason, clinical laboratories often determine the susceptibility of the bacterial isolate to a number of different antibiotics in order to establish the most effective antibiotic for treatment. Unfortunately, current susceptibility assays are time consuming. Antibiotic resistance often involves the chemical modification of an antibiotic to an inactive form by an enzyme expressed by the bacterium. Selected reaction monitoring (SRM) has the ability to quickly monitor and identify these chemical changes in an unprecedented time scale. In this work, we used SRM as a technique to determine the susceptibility of several different antibiotics to the chemically modifying enzymes β-lactamase and chloramphenicol acetyltransferase, enzymes used by bacteria to confer resistance to major classes of commonly used antibiotics. We also used this technique to directly monitor the effects of resistant bacteria grown in a broth containing a specific antibiotic. Because SRM is highly selective and can also identify chemical changes in a multitude of antibiotics in a single assay, SRM has the ability to detect organisms that are resistant to multiple antibiotics in a single assay. For these reasons, the use of SRM greatly reduces the time it takes to determine the susceptibility or resistance of an organism to a multitude of antibiotics by eliminating the time-consuming process found in other currently used methods. Copyright © 2013 John Wiley & Sons, Ltd.
抗生素抗性是全球日益严重的问题。因此,临床实验室通常检测细菌分离物对多种不同抗生素的敏感性,以确定最有效的治疗抗生素。不幸的是,目前的敏感性实验耗时较长。抗生素抗性通常涉及细菌表达的酶将抗生素
化学修饰成无活性形式。选定的反应监测(SRM)能够在空前的时间尺度上快速监测和识别这些
化学变化。在这项工作中,我们使用SRM作为一种技术来确定几种不同抗生素对
化学修饰酶β-内酰胺酶和
氯霉素乙酰转移酶的敏感性,这些酶是细菌用于赋予对常用抗生素主要类别的抗性的酶。我们还使用这项技术直接监测在含有特定抗生素的肉汤中培养的耐药细菌的效果。因为SRM具有高选择性,并且还可以在一次实验中识别多种抗生素的
化学变化,SRM有能力在一次实验中检测出对多种抗生素具有抗性的有机体。由于这些原因,使用SRM大大减少了确定有机体对多种抗生素的敏感性或抗性所需的时间,因为它消除了目前在其他使用的方法中存在的时间消耗过程。版权所有 © 2013 John Wiley & Sons, Ltd.