■金黄色葡萄球菌的耐药性,肺炎链球菌,化脓性链球菌和流感嗜血杆菌病情严重,迫切需要寻找新的抗菌药物。在这项研究中,铯中国特克斯。提取物进行了潜在的抗菌活性测试。
■T.用5种不同极性的溶剂(乙醇,石油醚,乙酸乙酯,正丁醇和双蒸水),并对其抗菌活性进行了测试。采用肉汤稀释法测定浓度为1g/mL的高活性植物提取物的最低抑菌浓度(MIC)和最低杀菌浓度(MBC)。研究了该提取物对生物膜形成的抑制活性。之后,我们研究了其对金黄色葡萄球菌转录组的影响。
■乙醇提取物编码为BRY,仅抑制金黄色葡萄球菌,而编码为BY2的乙酸乙酯提取物对所有测试细菌均显示出抑制作用。BRY对金黄色葡萄球菌的MIC为128mg/mL,MBC为512mg/mL。BY2对金黄色葡萄球菌的MIC,肺炎链球菌,化脓性链球菌和流感嗜血杆菌为8mg/mL,4mg/mL,4mg/mL,和4毫克/毫升,分别。这四种细菌的BY2的MBC范围为4至256mg/mL。机制研究表明,BRY和BY2在MIC浓度下对生物膜的抗形成有影响。转录组测序结果显示,经BY2处理后,金黄色葡萄球菌中531个基因表达上调,340个基因表达下调。
■BY2具有比BRY更宽的抗菌谱。同时,BY2对金黄色葡萄球菌的抑制作用优于BRY。BY2抗金黄色葡萄球菌的作用机制可能与抑制核糖体合成有关,限制柠檬酸循环的关键酶,致病性降低和对生物膜形成的影响。结果证实,BY2是T.chinense的主要抗菌部分,可用作抗菌剂的来源。
UNASSIGNED: The drug resistance of Staphylococcus aureus, Streptococcus pneumoniae, Streptococcus pyogenes and Haemophilus influenzae has become more and more serious, and it is urgent to seek new antibacterial drugs. In this study, Thesium chinense Turcz. extracts were tested for its potential antibacterial activities.
UNASSIGNED: T. chinense powder was extracted with 5 solvents of different polarity (ethyl alcohol, petroleum ether, ethyl acetate, n-butyl alcohol and double distilled water), and their antibacterial activities were tested. The Broth dilution method was used to evaluate the minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) of highly active plant extracts with a concentration of 1g/mL. The inhibitory activity of this extract on biofilm formation was investigated. Afterwards, we investigated its effect on the transcriptome of S. aureus.
UNASSIGNED: The ethanol extract coded as BRY, only inhibited S. aureus, whereas the ethyl acetate extract coded as BY2 showed inhibitory effect on all the tested bacteria. The MIC of BRY on S. aureus was 128 mg/mL, and the MBC was 512 mg/mL. The MIC of BY2 against S. aureus, S. pneumoniae, S. pyogenes and H. influenzae were 8 mg/mL, 4 mg/mL, 4 mg/mL, and 4 mg/mL, respectively. The MBC of BY2 for these four bacteria ranged from 4 to 256 mg/mL. Mechanism studies have shown that BRY and BY2 have an impact on anti-formation of biofilms at MIC concentrations. Transcriptome sequencing results showed that 531 genes were up-regulated and 340 genes showed down-regulated expression in S. aureus after BY2 treatment.
UNASSIGNED: BY2 has a broader antibacterial spectrum than BRY. Meanwhile, the inhibitory effect of BY2 on S. aureus is better than BRY. The mechanism of BY2 against S. aureus may relate to its inhibition of ribosome synthesis, restriction of key enzymes of citric acid cycle, decrease of pathogenicity and influence on biofilm formation. The results confirmed that BY2 was the main antibacterial part of T. chinense, which can be used as a source of antibacterial agents.