In-vitro Investigation of Antibiotics Efficacy Against Uropathogenic Escherichia coli Biofilms and Antibiotic Induced Biofilm Formation at Sub-Minimum Inhibitory Concentration of Ciprofloxacin
| Autor: | Saima Siddique, Zara Rafaque, Nasira Abid, Nida Liaqat, Pashmina Afridi, Safia Masood, Javid Iqbal Dasti, Sehrish Kanwal |
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| Rok vydání: | 2020 |
| Předmět: |
0301 basic medicine
Pharmacology medicine.drug_class Chemistry 030106 microbiology Antibiotics Biofilm Virulence biochemical phenomena metabolism and nutrition medicine.disease_cause Trimethoprim Microbiology Ciprofloxacin 03 medical and health sciences Minimum inhibitory concentration 0302 clinical medicine Infectious Diseases Levofloxacin medicine Pharmacology (medical) 030212 general & internal medicine Escherichia coli medicine.drug |
| Zdroj: | Infection and Drug Resistance. 13:2801-2810 |
| ISSN: | 1178-6973 |
| DOI: | 10.2147/idr.s258355 |
| Popis: | 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 µg/mL, while trimethoprim eradicated biofilms at higher concentrations (512-1024 µg/mL). Ciprofloxacin treatment at sub-MIC level significantly enhanced biofilm formation (P 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 µg/mL) on UPEC biofilms, while treatment with sub-minimal concentrations of ciprofloxacin significantly enhanced biofilm formation. Out of all tested antibiotics, trimethoprim (512-1024 µg/mL) eradicated UPEC biofilms. |
| Databáze: | OpenAIRE |
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