In-vitro Investigation of Antibiotics Efficacy Against Uropathogenic Escherichia coli Biofilms and Antibiotic Induced Biofilm Formation at Sub -Minimum Inhibitory Concentration of Ciprofloxacin

被引:31
作者
Rafaque, Zara [1 ,2 ]
Abid, Nasira [2 ]
Liaqat, Nida [2 ]
Afridi, Pashmina [2 ,3 ]
Siddique, Saima [2 ]
Masood, Safia [2 ]
Kanwal, Sehrish [2 ]
Dasti, Javid Iqbal [2 ]
机构
[1] Univ Cent Punjab, Fac Life Sci, Dept Microbiol, Lahore, Pakistan
[2] Quaid I Azam Univ, Fac Biol Sci, Dept Microbiol, Islamabad 45320, Pakistan
[3] Iqra Natl Univ, Dept Allied Hlth Sci, Peshawar, Pakistan
来源
INFECTION AND DRUG RESISTANCE | 2020年 / 13卷
关键词
biofilms; MIC; MBEC; sub-MIC; ciprofloxacin; uropathogenic Escherichia coli; URINARY-TRACT-INFECTIONS; ANTIMICROBIAL SUSCEPTIBILITY; VIRULENCE FACTORS; RESISTANCE; THERAPY;
D O I
10.2147/IDR.S258355
中图分类号
R51 [传染病];
学科分类号
100401 ;
摘要
Background: Community-acquired urinary tract infections are associated with significant morbidity, and uropathogenic Escherichia coli (UPEC) alone causes 90% of urinary tract infections. This bacterium retains a diverse armament of virulence factors including fimbria, hemolysins, and siderophores production. In a post invasion scenario, formation of intracellular communities mimic biofilm-like characteristics and are linked to recurrent urinary tract infections. We investigated the effects of different frontline antibiotics on the formation, inhibition, and eradication of biofilms of virulent UPEC strains. Materials and Methods: A total of 155 UPEC strains were scrutinized for various virulence factors including gelatinase, cell surface hydrophobicity, hemagglutination, and serum bactericidal activity. Biofilm formation was confirmed by three different methods: Congo red agar, test tube, and tissue culture plate method. Biofilm inhibition and eradication assays were performed according to the standard protocols. Topographical analysis of biofilms was done by scanning electronic microscopy (SEM). Results: Out of 155 strains, 113 (73%) were strong biofilm formesr, while 37 (24%) produced biofilms at moderate level. Significant differences were observed between MICs of planktonic cells (MIC-p) and MICs of UPEC biofilms (MIC-b). Among tested frontline antibiotics, levofloxacin successfully inhibited biofilms at a concentration of 32 mu g/mL, while trimethoprim eradicated biofilms at higher concentrations (512-1024 mu g/mL). Ciprofloxacin treatment at sub-MIC level significantly enhanced biofilm formation (P<0.05). Conclusion: The majority of UPEC strains are strong biofilm formers and show higher tolerance towards frontline antibiotics in biofilm form. We observed significant inhibitory effects of levofloxacin (32 mu g/mL) on UPEC biofilms, while treatment with sub-minimal concentrations of ciprofloxacin significantly enhanced biofilm formation. Out of all tested antibiotics, trimethoprim (512-1024 mu g/mL) eradicated UPEC biofilms.
引用
收藏
页码:2801 / 2810
页数:10
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