Due to the increasing resistance of Pseudomonas aeruginosa to most clinically relevant antimicrobials, it is challenging to treat bacterial infection with traditional antibiotics. Quorum sensing can regulate the production of biofilms and virulence factors which are closely related to bacterial resistance. Previously we synthesized a series of oxazolidinone compounds targeting the quorum-sensing transcriptional regulatory protein CviR and ZS-12 showed good activity against Chromobacterium violaceum CV026 quorum-sensing. In this study, eighteen 3-amino-2-oxazolidinone compounds were designed and synthesized using ZS-12 as the lead compound. We initially evaluated the inhibitory activities of novel oxazolidinone compounds against QS using C. violaceum CV026 as a reporter strain. Thirteen compounds showed good activities (IC₅₀ range 3.69–63.58 μM) and YXL-13 inhibition was the most significant (IC₅₀ = 3.686 ± 0.5790 μM) against biofilm formation and virulence factors determination of P. aeruginosa PAO1. In vitro, YXL-13 significantly inhibited the formation of PAO1 biofilm (range 42.98%–17.67%), the production of virulence factors (pyocyanin, elastase, rhamnolipid, and protease), and bacterial motility. Moreover, the combination of YXL-13 with an antibiotic (meropenem trihydrate) could significantly improve the antibiotic susceptibility of biofilm P. aeruginosa PAO1 cells. In vivo, YXL-13 significantly prolonged the lifespan of wildtype Caenorhabditis elegans N2 infected by P. aeruginosa PAO1. In conclusion, YXL-13 is a candidate agent for antibiotic-resistant P. aeruginosa PAO1and provides a method for finding new antibacterial drugs.

由于铜绿假单胞菌对大多数与临床相关的抗菌药耐药性增加，因此用传统抗生素治疗细菌感染具有挑战性。群体感应可以调节与细菌抗性密切相关的生物膜和毒力因子的产生。以前，我们合成了一系列针对群体感应的转录调节蛋白CviR的恶唑烷酮化合物，ZS-12对紫罗兰色杆菌CV026群体感应具有良好的活性。在这项研究中，使用ZS-12作为先导化合物设计并合成了18种3-氨基-2-恶唑烷酮化合物。我们最初使用C. violaceum评价了新型恶唑烷酮类化合物对QS的抑制活性CV026作为报告菌株。十三种化合物表现出良好的活性（IC ₅₀范围为3.69-63.58μM），YXL-13抑制作用最强（IC ₅₀  = 3.686±0.5790μM）对铜绿假单胞菌PAO1的生物膜形成和毒力因子测定具有抑制作用。在体外， YXL-13显着抑制PAO1生物膜的形成（范围为42.98％–17.67％），毒力因子（花青素，弹性蛋白酶，鼠李糖脂和蛋白酶）的产生以及细菌运动。此外，YXL-13与抗生素（美罗培南三水合物）的组合可以显着提高生物膜铜绿假单胞菌PAO1细胞的抗生素敏感性。体内，YXL-13显着延长了由铜绿假单胞菌PAO1感染的野生型秀丽隐杆线虫N2的寿命。总之，YXL-13是铜绿假单胞菌PAO1的候选药物，为寻找新的抗菌药物提供了一种方法。