Inactivation of a putative efflux pump (LmrB) in Streptococcus mutans results in altered biofilm structure and increased exopolysaccharide synthesis: implications for biofilm resistance

Inactivation of a putative efflux pump (LmrB) in Streptococcus mutans results in altered biofilm structure and increased exopolysaccharide synthesis: implications for biofilm resistance
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变形链球菌中假定的外排泵 (LmrB) 失活导致生物膜结构改变和胞外多糖合成增加:对生物膜耐药性的影响

DOI:
10.1080/08927014.2017.1323206
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发表时间:
2017-06
期刊:
影响因子:
2.7
通讯作者:
Wei X
Wei X
中科院分区:
生物学3区
文献类型:
--
作者:
Liu Jia;Guo Lihong;Zhao Wei;Hu Xiaoli;Wei Xi;Zhang Jianying;Wei X

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摘要外排泵是与生物膜形成和耐药性相关的一种机制。有有限的信息外排泵变形链球菌,龋齿的主要病原体。本研究的目的是探讨一个推定的外排泵(LmrB)在S。变形菌生物膜形成和易感性。在lmrB失活和抗微生物剂暴露后,使用共聚焦激光扫描显微镜(CLSM)和qRT-PCR检查生物膜结构和其他外排泵的表达。lmrB失活导致生物膜结构改变,EPS形成和EPS相关基因转录增加(p < 0.05),但未观察到易感性的改善。当暴露于抗微生物剂时,大多数外排泵基因的表达在lmrB失活后增加(p < 0.05),表明激活其他外排泵的转录以补偿lmrB的损失的反馈机制。这些观察结果意味着单独灭活lmrB不是控制生物膜的有效解决方案。
Abstract Efflux pumps are a mechanism associated with biofilm formation and resistance. There is limited information regarding efflux pumps in Streptococcus mutans, a major pathogen in dental caries. The aim of this study was to investigate potential roles of a putative efflux pump (LmrB) in S. mutans biofilm formation and susceptibility. Upon lmrB inactivation and antimicrobial exposure, the biofilm structure and expression of other efflux pumps were examined using confocal laser scanning microscopy (CLSM) and qRT-PCR. lmrB inactivation resulted in biofilm structural changes, increased EPS formation and EPS-related gene transcription (p < 0.05), but no improvement in susceptibility was observed. The expression of most efflux pump genes increased upon lmrB inactivation when exposed to antimicrobials (p < 0.05), suggesting a feedback mechanism that activated the transcription of other efflux pumps to compensate for the loss of lmrB. These observations imply that sole inactivation of lmrB is not an effective solution to control biofilms.
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