Inhibition of Staphylococcus aureus TetK and MsrA efflux pumps by hydroxyamines derived from lapachol and norlachol
作者:Fernando Gomes Figueredo、Rodrigo Emmanuel L. T. Parente、Maynara Rodrigues Cavalcante-Figueredo、Jakson Gomes Figueiredo、Raimundo Luiz Pereira da Silva、Edinardo Fagner Ferreira Matias、Tania Maria Sarmento Silva、Celso Amorim Camara、Cícera Datiane de Morais Oliveira-Tintino、Saulo Relison Tintino、Henrique Douglas Melo Coutinho、Marta Maria de Franca Fonteles
DOI:10.1007/s10863-021-09885-5
日期:2021.4
The present study aimed to evaluate the in vitro efflux pump inhibitory capacity of hydroxyamines derived from lapachol and norlachol, where compounds 3, 4, and 5 were tested against the S. aureus strains: RN4220 carrying the pUL5054 plasmid; and IS-58, endowed with the PT181 plasmid. The substances were synthesized from 2-hydroxy-quinones, lapachol and nor-lapachol obtaining the corresponding 2-methoxylated derivatives via dimethyl sulfate alkylation in a basic medium, which then reacted chemoselectively with 2-ethanolamine and 3-propanolamine to form the corresponding amino alcohols. The antibacterial action of the substances was quantified by determining the Minimum Inhibitory Concentration (MIC), while a microdilution assay was carried out to ascertain efflux pump inhibition of Staphylococcus aureus strains carrying the MsrA macrolide and the TetK tetracycline efflux pumps with the substances at a sub-inhibitory concentration. The results were subjected to statistical analysis by an ANOVA test and Bonferroni post hoc test. The MIC from the substances exhibited a value ≥ 1024 µg/mL. However, a significant reduction (p < 0.0001) of the erythromycin, tetracycline and ethidium bromide MIC was demonstrated when these were in combination with the substances, with this effect being due to a supposed efflux pump inhibition. The tested substances demonstrated effectiveness at decreasing the MIC of erythromycin, tetracycline and ethidium bromide, potentially by inhibiting the MsrA macrolide and the TetK tetracycline efflux pumps present in the tested S. aureus strains.
本研究旨在评估拉帕酚和去甲拉酚衍生的羟胺的体外外排泵抑制能力,其中化合物 3、4 和 5 针对金黄色葡萄球菌菌株进行了测试:携带 pUL5054 质粒的 RN4220;携带 pUL5054 质粒的 RN4220;和IS-58,赋予PT181质粒。该物质由2-羟基醌、拉帕酚和正拉帕酚在碱性介质中通过硫酸二甲酯烷基化得到相应的2-甲氧基化衍生物,然后与2-乙醇胺和3-丙醇胺发生化学选择性反应生成相应的氨基醇。通过测定最低抑菌浓度 (MIC) 来量化这些物质的抗菌作用,同时进行微量稀释测定,以确定这些物质在亚浓度下对携带 MsrA 大环内酯和 TetK 四环素外排泵的金黄色葡萄球菌菌株的外排泵抑制作用。 -抑制浓度。结果通过 ANOVA 检验和 Bonferroni 事后检验进行统计分析。这些物质的 MIC 值≥≥1024 µg/mL。然而,当红霉素、四环素和溴化乙锭与这些物质合用时,其 MIC 显着降低 (p<0.0001),这种效应是由于假定的外排泵抑制所致。测试物质显示出可有效降低红霉素、四环素和溴化乙锭的 MIC,这可能是通过抑制测试金黄色葡萄球菌菌株中存在的 MsrA 大环内酯和 TetK 四环素外排泵来实现的。