Journal
BIOFOULING
Volume 36, Issue 5, Pages 597-609Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/08927014.2020.1783253
Keywords
Biofilm; lactobacilli; elastase; pyocyanin; diketopiperazines
Funding
- SCAIT-UNT [PIUNT D26/638-1]
- Agencia Nacional de Promocion Cientifica y Tecnica ANPCyT [PICT 02071, 02514]
- Consejo Nacional de Investigaciones Cientificas y Tecnicas, CONICET [PIP 662]
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This work investigated chloroform extracts from culture supernatants of two human probiotic bacteria,Lactobacillus caseiCRL 431 andLactobacillus acidophilusCRL 730 for the production of virulence factors andquorum sensing(QS) interference against threePseudomonas aeruginosastrains. Both extracts inhibited biofilm biomass (up to 50%), biofilm metabolic activity (up to 39%), the production of the enzyme elastase (up to 63%) and pyocyanin (up to 77%), and decreased QS, without presenting any antibacterial acgivity. In addition, the chloroform extracts of both strains disrupted preformed biofilms of the three strains ofP. aeruginosaanalyzed (up to 40%). GC-MS analysis revealed that the major compounds detected in the bioactive extracts were four diketopiperazines. This study suggests that the metabolites ofL. caseiandL. acidophiluscould be a promising alternative to combat the pathogenicity ofP. aeruginosa.
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