桂皮醛联合万古霉素对耐甲氧西林金黄色葡萄球菌生物膜的抑制作用
The Effect of Cinnamaldehyde and Vancomycin on Biofilm Inhibition of Methicillin-Resistant Staphylococcus Aureus
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摘要: 目的 研究桂皮醛联合万古霉素对耐甲氧西林金黄色葡萄球菌 (methiciline-resistant Staphylococcus aureus, MRSA) 生物膜的影响.方法 96孔板法构建金黄色葡萄球菌标准菌株ATCC25923和5株临床分离MRSA菌株的体外生物膜模型, 结晶紫半定量法检测其成膜能力;选取标准菌株和强成膜临床菌株为实验菌株, 采用氯化三苯基四氮唑 (TTC) 法确定药物单用及联用的最低抑菌浓度 (minimum inhibitory concentration, MIC) ;微量棋盘稀释法测出两药联用的最小抑膜浓度 (s MIC) .结果 96孔板培养3 d可见成熟生物膜形成, 结晶紫半定量法测得编号为16187的实验菌株有较强的产生物膜能力;桂皮醛和万古霉素对标准菌株的MIC为256μg/m L和1μg/m L, 对MRSA16187菌株的MIC为128μg/m L和0.5μg/m L, 两药联用对标准菌株的MIC为16μg/m L和0.06μg/m L, 对MRSA16187菌株的MIC为16μg/m L和0.03μg/m L;MRSA16187在桂皮醛和万古霉素联用与单独用药后s MIC50相比差别有显著性 (P<0.05和P<0.05) , s MIC90相比差别有显著性 (P<0.05和P<0.05) ;ATCC25923在桂皮醛和万古霉素联用与单独用药后s MIC50相比差别有显著性 (P<0.05和P<0.05) , s MIC90相比差别有显著性 (P<0.05和P<0.01) .结论 桂皮醛能显著增强万古霉素抗MRSA生物膜的作用, 且两药具有协同抗菌作用.Abstract: Objective To investigate the effect of cinnamaldehyde and vancomycin on Biofilm inhibition of methicillin-resistant staphylococcus aureus (MRSA) . Me thods Modified plate culture method was used to establish in vitro biofilm model for MRSA standard strain ATCC25923 and other 5 strains from patient samples, and crystal violet semi-quantitative method was applied to detect the biofilm formation. The minimum inhibitory concentration (MIC) of ATCCA strain and typical MRSA strain was determined using triphenyl tetrazolium chloride (TTC) method. Micrdilution checkerboard techniques was adopted to determine the MIC of drugs combination. Re s ults The biofilm will be maturated in three days;Strain 16187 showed strong capacity of biomilm formation; MICs of standard strain for cinnamaldehyde and vancomycin were 256 μg/m L and 1 μg/m L; MICs of strain 16187 for cinnamaldehyde and vancomycin were 128 μg/m L and 0.5 μg/m L;MIC of standard strain for combination of cinnamaldehyde and vancomycin were 16 μg/m L and 0.006 μg/m L, and 16 μg/m L and 0.03 μg/m L for stain 16187. Comparing MRSA16187 in treated with medicatoin conbired with cinnamaldehyde and vancomycinand single medication the difference of sMIC50 was significant (P<0.05 and P<0.05) , and there was significant difference when we compared sMIC90 (P<0.05 and P<0.05) ;Comparing ATCC25923 treated with medication combined with cinnamaldehyde and vancomycin the difference was of sMIC50 significant (P<0.05 and P<0.05) , and sMIC90 showed the significant difference (P <0.05 and P <0.01) .Conclusion Cinnamaldehyde synergistically enhances the capacity of vancomycin on biofilminhibitory on MRSA.
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Key words:
- Biofilm /
- MRSA /
- Cinnamaldehyd /
- Vancomycin
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