Antibiotics (Mar 2021)

Indole Derivatives Obtained from Egyptian <i>Enterobacter</i> sp. Soil Isolates Exhibit Antivirulence Activities against Uropathogenic <i>Proteus mirabilis</i>

  • Mai A. Amer,
  • Reham Wasfi,
  • Ahmed S. Attia,
  • Mohamed A. Ramadan

DOI
https://doi.org/10.3390/antibiotics10040363
Journal volume & issue
Vol. 10, no. 4
p. 363

Abstract

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Proteus mirabilis is a frequent cause of catheter associated urinary tract infections (CAUTIs). Several virulence factors contribute to its pathogenesis, but swarming motility, biofilm formation, and urease activity are considered the hallmarks. The increased prevalence in antibiotic resistance among uropathogens is alarming and requires searching for new treatment alternatives. With this in mind, our study aims to investigate antivirulence activity of indole derivatives against multidrug resistant P. mirabilis isolates. Ethyl acetate (EtOAc) extracts from Enterobacter sp. (rhizobacterium), isolated from Egyptian soil samples were tested for their ability to antagonize the virulence capacity and biofilm activity of P. mirabilis uropathogens. Extracts of two Enterobacter sp. isolates (coded Zch127 and Cbg70) showed the highest antivirulence activities against P. mirabilis. The two promising rhizobacteria Zch127 and Cbg70 were isolated from soil surrounding: Cucurbita pepo (Zucchini) and Brassica oleracea var. capitata L. (Cabbage), respectively. Sub-minimum inhibitory concentrations (Sub-MICs) of the two extracts showed potent antibiofilm activity with significant biofilm reduction of ten P. mirabilis clinical isolates (p-value P. mirabilis uropathogens and as potential therapy for treatment of urinary tract infections (UTIs).

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