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Relebactam(MK-7655,AbMole,M20709)是一种二氮杂双环辛烷类β-内酰胺酶抑制剂,对A类超广谱β-内酰胺酶(ESBLs)、KPC型碳青霉烯酶及C类AmpC酶具有广谱的抑制活性。β-内酰胺酶是细菌产生耐药性的主要机制之一,该酶通过水解β-内酰胺类抗生素的β-内酰胺环,使抗生素失去抗菌活性。A类酶(包括ESBLs和KPC)和C类酶(AmpC)是研究中最常见的β-内酰胺酶类型,β-内酰胺酶的过表达或表达该酶的质粒在细菌之间传播均能导致多种β-内酰胺抗生素失效。Relebactam(瑞来巴坦,CAS No.:1174018-99-5,AbMole,M20709)通过与β-内酰胺酶活性位点的丝氨酸残基共价结合,形成酰基-酶中间体,阻断底物进入活性口袋,从而恢复β-内酰胺抗生素的抗菌活性。
Relebactam(AbMole,M20709)本身缺乏独立的抗菌活性,但通过与β-内酰胺酶形成稳定的共价复合物,保护联用的β-内酰胺类抗生素免受降解。在Imipenem(MK0787,亚胺培南),Cilastatin(西司他丁,MK0791)与Relebactam的联合应用中,Relebactam能有效抑制KPC-2及A类和C类β-内酰胺酶,使Imipenem 恢复对产KPC肠杆菌及多药耐药铜绿假单胞菌的杀菌活性。Relebactam(CAS No.:1174018-99-5) 对携带常见耐药基因(如孔蛋白缺失oprD和ompK36、AmpC过表达)的铜绿假单胞菌和肺炎克雷伯菌同样展现出上述类似的增效活性。然而,Relebactam对鲍曼不动杆菌(包括ampC或blaOXA-51过表达株)无额外增效作用,表明其对OXA型碳青霉烯酶缺乏抑制活性。
在细胞实验层面,Relebactam(AbMole,M20709)的抗菌增效效应已在多种体外模型中得到验证。在固定浓度4 μg/mL的Relebactam(瑞来巴坦)条件下,Imipenem(亚胺培南) 对产KPC-2和KPC-3菌株的MIC值可恢复到与敏感对照株相当的水平。
在动物实验层面,Relebactam(AbMole,M20709)的动物体内有效性已在多种感染模型中得到证实,包括小鼠复杂性尿路感染和腹腔内感染。Relebactam(CAS No.:1174018-99-5,AbMole,M20709)作为新型二氮杂双环辛烷类β-内酰胺酶抑制剂,其在β-内酰胺酶功能研究、抗菌增效机制探索及耐药菌干预策略开发中的广泛应用,使其成为抗菌研究领域的重要工具。
本文所述均为科研试剂,仅供科学研究参考。
参考文献及鸣谢
[1] Titov AG, et al. A randomized, double-blind, placebo-controlled, multicenter trial to evaluate the safety and efficacy of imipenem/cilastatin/relebactam in adults with complicated intra-abdominal infection. Clin Infect Dis, 2020, 71(9): e369-e378.[2] Relebactam Product Information. InVivoChem, 2024.[3] Beta-Lactamase Inhibitors. StatPearls, NCBI Bookshelf, NIH, 2022.[4] Livermore DM, et al. In vitro activity of imipenem/relebactam against Gram-negative bacteria. J Antimicrob Chemother, 2019, 74(4): 957-968.
细胞系:Imipenem-resistant Pseudomonas aeruginosa and Klebsiella pneumoniae clinical isolates; purified class A (KPC-2) and class C (PDC-1) β-lactamases
方法:Broth microdilution assay was performed to determine minimum inhibitory concentrations according to CLSI guidelines; β-lactamase inhibitory activity was quantified via continuous spectrophotometric monitoring of nitrocefin hydrolysis in 384-well plates
浓度:0.61 nM, 1.22 nM, 2.44 nM, 4.88 nM, 9.77 nM, 19.5 nM, 39 nM, 78.1 nM, 156.3 nM, 312.5 nM, 625 nM, 1.25 μM, 2.5 μM, 5 μM, 10 μM, 20 μM (enzyme inhibition assay); 4 mg/L fixed concentration combined with serially diluted imipenem (0.0625–256 mg/L) for MIC testing
处理时间:2 h for continuous enzyme kinetics assay; 16–20 h for broth microdilution MIC determination
参考文献:Antimicrob Agents Chemother. 2019 Aug 15;63 (9):e00722-19
上述方法来自公开文献,仅供相同目的实验参考。如实验目的、材料、方法不同,请参考其他文献。
动物实验参考
动物模型:Female DBA/2n mice, 6–8 weeks old (20 g body weight), cyclophosphamide-induced neutropenic, Pseudomonas aeruginosa CLB 24228 strain-induced disseminated intraperitoneal infection model
配制:The complete solvent composition was not described in original paper
剂量:10, 20, 40 mg/kg (administered in combination with 5 mg/kg imipenem-cilastatin)
给药处理:Intraperitoneal injection, single dose initiated 15 min after bacterial inoculation; bacterial colony counts in target tissues were quantified at 24 h post-administration
参考文献:Antimicrob Agents Chemother. 2018 Aug;62 (8):e00501-18
上述方法来自公开文献,仅供相同目的实验参考。如实验目的、材料、方法不同,请参考其他文献。
体内实验的工作液,建议现用现配,当天使用;如在配制过程中出现沉淀、析出现象,可以通过超声和(或)加热的方式助溶。切勿一次性将产品全部溶解。
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