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Virulence properties and antimicrobial resistance of Pseudomonas aeruginosa isolated from cave waters at Roraima Tepui, Guayana Highlands
Letters in Applied Microbiology ( IF 2.4 ) Pub Date : 2020-05-01 , DOI: 10.1111/lam.13283
P Suárez 1 , A V Gutiérrez 2 , V Salazar 2 , M L Puche 3 , Y Serrano 1 , S Martínez 1 , G González 3, 4 , M Fernández-Delgado 2
Affiliation  

Pseudomonas aeruginosa is a prominent member of emerging waterborne pathogens. The environmental reservoirs of multi‐resistant phenotypes and other virulence factors in this bacterium are poorly understood. Our study aimed to determine the virulence properties of P. aeruginosa isolated from Roraima Sur Cave (RSC) waters at Guayana Highlands. Based on the best identification at species level by biochemical tests, 16S rRNA sequencing and phylogenetic inferences, one RSC isolate named LG11 was characterized for virulence properties in comparison with P. aeruginosa reference strains. PCR amplification of alginate, elastase, exoenzyme S, exotoxin A, neuraminidase and Quorum‐Sensing genes showed a high virulence potential in LG11. This isolate demonstrated multi‐resistance to ceftriaxone, tigecycline and imipenem. Pyocyanin production was greater in LG11 (0·478 µg ml−1) than the strain ATCC 10145 (0·316 µg ml−1), but the highest pigment concentration (2·140 µg ml−1) was displayed by the clinical strain CVCM 937 (P = 0·000175). Pronounced biomass production on granite and glass (P < 0·05) and well‐developed biofilms indicated the ability of P. aeruginosa from RSC to colonize surfaces found in human and healthcare environments. These data suggest that waters from pristine ecosystems such as RSC could be reservoirs of this opportunistic bacterium carrying important virulence properties with potential epidemiological implications.

中文翻译:

从瓜亚那高地 Roraima Tepui 洞穴水中分离出的铜绿假单胞菌的毒力特性和抗菌素耐药性

铜绿假单胞菌是新兴水源性病原体的重要成员。人们对这种细菌中多重耐药表型和其他毒力因子的环境宿主知之甚少。我们的研究旨在确定从瓜亚那高地 Roraima Sur Cave (RSC) 水域分离的铜绿假单胞菌的毒力特性。基于通过生化测试、16S rRNA 测序和系统发育推断在物种水平上的最佳鉴定,一种名为 LG11 的 RSC 分离株与铜绿假单胞菌参考菌株相比具有毒力特性。藻酸盐、弹性蛋白酶、外酶 S、外毒素 A、神经氨酸酶和群体感应基因的 PCR 扩增在 LG11 中显示出高毒力潜力。该分离株对头孢曲松、替加环素和亚胺培南具有多重耐药性。LG11 (0·478 µg ml-1) 中的绿脓素产量高于菌株 ATCC 10145 (0·316 µg ml-1),但临床菌株显示出最高的色素浓度 (2·140 µg ml-1) CVCM 937 (P = 0·000175)。花岗岩和玻璃上明显的生物量产生 (P < 0·05) 和发育良好的生物膜表明来自 RSC 的铜绿假单胞菌能够在人类和医疗环境中发现的表面定植。这些数据表明,来自原始生态系统(如 RSC)的水域可能是这种机会性细菌的宿主,这些细菌具有重要的毒力特性,具有潜在的流行病学意义。花岗岩和玻璃上明显的生物量产生 (P < 0·05) 和发育良好的生物膜表明来自 RSC 的铜绿假单胞菌能够在人类和医疗环境中发现的表面定植。这些数据表明,来自原始生态系统(如 RSC)的水域可能是这种机会性细菌的宿主,这些细菌具有重要的毒力特性,具有潜在的流行病学意义。花岗岩和玻璃上明显的生物量产生 (P < 0·05) 和发育良好的生物膜表明来自 RSC 的铜绿假单胞菌能够在人类和医疗环境中发现的表面定植。这些数据表明,来自原始生态系统(如 RSC)的水域可能是这种机会性细菌的宿主,这些细菌具有重要的毒力特性,具有潜在的流行病学意义。
更新日期:2020-05-01
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