AUTHOR=Zhong Xinyi , Deng Kai , Yang Xiuhan , Song Xu , Zou Yuanfeng , Zhou Xun , Tang Huaqiao , Li Lixia , Fu Yuping , Yin Zhongqiong , Wan Hongping , Zhao Xinghong 

TITLE=Brevicidine acts as an effective sensitizer of outer membrane-impermeable conventional antibiotics for Acinetobacter baumannii treatment

JOURNAL=Frontiers in Microbiology

VOLUME=14

YEAR=2023

URL=https://www.frontiersin.org/journals/microbiology/articles/10.3389/fmicb.2023.1304198

DOI=10.3389/fmicb.2023.1304198

ISSN=1664-302X

ABSTRACT=<p>The antibiotic resistance of <italic>Acinetobacter baumannii</italic> poses a significant threat to global public health, especially those strains that are resistant to carbapenems. Therefore, novel strategies are desperately needed for the treatment of infections caused by antibiotic-resistant <italic>A. baumannii</italic>. In this study, we report that brevicidine, a bacterial non-ribosomally produced cyclic lipopeptide, shows synergistic effects with multiple outer membrane-impermeable conventional antibiotics against <italic>A. baumannii</italic>. In particular, brevicidine, at a concentration of 1 μM, lowered the minimum inhibitory concentration of erythromycin, azithromycin, and rifampicin against <italic>A. baumannii</italic> strains by 32–128-fold. Furthermore, mechanistic studies were performed by employing erythromycin as an example of an outer membrane-impermeable conventional antibiotic, which showed the best synergistic effects with brevicidine against the tested <italic>A. baumannii</italic> strains in the present study. The results demonstrate that brevicidine disrupted the outer membrane of <italic>A. baumannii</italic> at a concentration range of 0.125–4 μM in a dose-dependent manner. This capacity of brevicidine could help the tested outer membrane-impermeable antibiotics enter <italic>A. baumannii</italic> cells and thereafter exert their antimicrobial activity. In addition, the results show that brevicidine–erythromycin combination exerted strong <italic>A. baumannii</italic> killing capacity by the enhanced inhibition of adenosine triphosphate biosynthesis and accumulation of reactive oxygen species, which are the main mechanisms causing the death of bacteria. Interestingly, brevicidine and erythromycin combination showed good therapeutic effects on <italic>A. baumannii</italic>-induced mouse peritonitis–sepsis models. These findings demonstrate that brevicidine is a promising sensitizer candidate of outer membrane-impermeable conventional antibiotics for treating <italic>A. baumannii</italic> infections in the post-antibiotic age.</p>