Chitosan extracted from Aspergillus flavus shows synergistic effect, eases quorum sensing mediated virulence factors and biofilm against nosocomial pathogen Pseudomonas aeruginosa

被引:38
作者
Muslim, Sahira Nsayef [1 ]
Al Kadmy, Israa M. S. [1 ]
Ali, Alaa Naseer Mohammed [1 ]
Salman, Batool Kadham [3 ]
Ahmad, Mohammad [4 ]
Khazaal, Saba Saadoon [1 ]
Hussein, Nadheema Hammood [1 ]
Muslim, Sraa Nsayef [2 ]
机构
[1] AL Mustansiryiah Univ, Coll Sci, Dept Biol, Baghdad, Iraq
[2] AL Karkh Univ, Coll Remote Sensing & Geophys, Dept Geophys, Baghdad, Iraq
[3] Minist Hlth, Baghdad, Iraq
[4] King Saud Univ, Coll Nursing, Med Surg Nursing Dept, Riyadh, Saudi Arabia
关键词
Antibacterial activity; Chitosan; Aspergillus flavus; ANTIMICROBIAL ACTIVITY; ANTIBACTERIAL;
D O I
10.1016/j.ijbiomac.2017.08.146
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
The biological methods for extraction of chitosan were used as alternative procedures for chemical methods In biological methods, the chitosan was extracted from A. flavus by using of Lactobacillus paracasei for demineralization and Bacillus subtilis for deproteinization. The yield of extracted chitosan reached to 53.8%, pH was 7.8 and complete solubility in 1% acitic acid. Purified chitosan had the ability to reduce the biofilm forming capacity of P. aeruginosa clearly visible in light microscopic staining and scanning electron microscopy. The QS dependent phenotype and QS regulated gene expression was significantly reduced in the influence of chitosan. A significant decrease in biofilm formation was seen in the presence of chitosan. The chitosan treatment showed a decrease in the expression of lasR and rhlR genes. Same time production of pyocyanin and proteases was also inhibited in dose dependent manner. Chitosan led to increasing antimicrobial activity of antibiotics and had synergism effect, thus chitosan may be a useful adjuvant agent for the treatment of many bacterial infections in combination with antibiotics. (C) 2017 Elsevier B.V. All rights reserved.
引用
收藏
页码:52 / 58
页数:7
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