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Ultra-fast and universal detection of Gram-negative bacteria in complex samples based on colistin derivatives.
Biomaterials Science ( IF 5.8 ) Pub Date : 2020-01-14 , DOI: 10.1039/c9bm01926j
Jea Sung Ryu 1 , San Hae Im 2 , Yoo Kyung Kang 2 , Yang Soo Kim 3 , Hyun Jung Chung 4
Affiliation  

Gram-negative bacteria are a significant cause of infections acquired in both hospital and community settings, resulting in a high mortality rate worldwide. Currently, a Gram-negative infection is diagnosed by symptom evaluation and is treated with empiric antibiotics which target both Gram-negative and Gram-positive bacteria. A rapid and simple diagnostic method would enable immediate and targeted treatment, while dramatically reducing antibiotic overuse. Herein, we introduce a method utilizing a fluorescent derivative of colistin (COL-FL), that can directly label the Gram-negative cell wall of live bacteria and universally detect the targets within 10 min. By using the COL-FL assay, we achieved the differential labeling of various Gram-negative pathogens related to hospital-acquired infections, which could be subsequently detected via spectrofluorometry and microscopy. Further, we determined that our method can be used for complex samples, such as combinations of multiple bacterial types; bacteria in the presence of mammalian cells; and bacteria with serum components. This assay can be integrated into a simple diagnostic platform for rapid screening tests and the stratification of Gram-negative bacterial infections in the clinic.

中文翻译:

基于大肠杆菌素衍生物的复杂样品中革兰氏阴性细菌的超快速通用检测。

革兰氏阴性细菌是在医院和社区环境中获得感染的重要原因,导致全世界的高死亡率。当前,通过症状评估诊断出革兰氏阴性感染,并用针对革兰氏阴性和革兰氏阳性细菌的经验性抗生素治疗。一种快速,简单的诊断方法可以立即进行针对性治疗,同时大大减少抗生素的过度使用。在这里,我们介绍一种利用大肠菌素荧光衍生物(COL-FL)的方法,该方法可以直接标记活细菌的革兰氏阴性细胞壁,并在10分钟内普遍检测目标。通过使用COL-FL分析,我们获得了与医院获得性感染相关的各种革兰氏阴性病原体的差异标记,随后可以通过荧光分光光度法和显微镜进行检测。此外,我们确定我们的方法可用于复杂的样品,例如多种细菌类型的组合。存在哺乳动物细胞的细菌;和带有血清成分的细菌。该测定法可以集成到简单的诊断平台中,以进行快速筛查测试和在临床中对革兰氏阴性细菌感染进行分层。
更新日期:2020-01-14
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