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Antimicrobial and antibiofilm activities of ursolic acid against carbapenem-resistant Klebsiella pneumoniae.
The Journal of Antibiotics ( IF 2.1 ) Pub Date : 2020-02-12 , DOI: 10.1038/s41429-020-0285-6
Weidong Qian 1 , Wenjing Wang 1 , Jianing Zhang 1 , Ting Wang 1 , Miao Liu 1 , Min Yang 1 , Zhaohuan Sun 1 , Xiang Li 1 , Yongdong Li 2
Affiliation  

Previous studies demonstrated that ursolic acid (UA) present in apple pomace displays antimicrobial activity against some microorganisms, but the underlying mechanisms associated with this activity remain unexplored. Furthermore, there are no reports on the effect of UA on carbapenem-resistant Klebsiella pneumoniae (CRKP). This study examined the antimicrobial activity and mode of action of UA against CRKP was examined. Minimum inhibitory concentration (MIC) of UA against CRKP was determined by the agar dilution method. Variations in the intracellular pH (pHin), ATP concentration, and cell membrane potential were measured to assess the influence of UA on the cell membrane. Our results show that UA was effective against CRKP at an MIC of 0.8 mg ml-1. UA disrupted the cell membrane integrity of CRKP, exhibited strong inhibitory effects against biofilm formation and biofilm-related gene expression, and inactivated CRKP cells encased in biofilms. Thus, UA shows promise for use in combination with other antibiotics to treat multidrug resistant K. pneumoniae infections.

中文翻译:


熊果酸对耐碳青霉烯类肺炎克雷伯菌的抗菌和抗生物膜活性。



先前的研究表明,苹果渣中的熊果酸 (UA) 对某些微生物具有抗菌活性,但与这种活性相关的潜在机制仍未被探索。此外,目前还没有关于UA对耐碳青霉烯类肺炎克雷伯菌(CRKP)的影响的报道。本研究检查了 UA 对抗 CRKP 的抗菌活性和作用方式。采用琼脂稀释法测定UA对CRKP的最低抑菌浓度(MIC)。测量细胞内 pH (pHin)、ATP 浓度和细胞膜电位的变化,以评估 UA 对细胞膜的影响。我们的结果表明,UA 在 MIC 为 0.8 mg ml-1 时对 CRKP 有效。 UA破坏了CRKP细胞膜的完整性,对生物膜形成和生物膜相关基因表达表现出强烈的抑制作用,并使生物膜中包裹的CRKP细胞失活。因此,UA有望与其他抗生素联合使用来治疗多重耐药肺炎克雷伯菌感染。
更新日期:2020-02-12
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