1887

Abstract

Lysophosphatidic acid (LPA) occurs naturally in inflammatory exudates and has previously been shown to increase the susceptibility of to β-lactam antibiotics whilst concomitantly reducing accumulation of the virulence factors pyoverdine and elastase. Here it is demonstrated that LPA can also exert inhibitory effects upon pyocyanin production in , as well as influencing susceptibility to a wide range of chemically diverse non β-lactam antimicrobials. Most strikingly, LPA markedly antagonizes the effect of the polycationic antibiotics colistin and tobramycin at a concentration of 250 µg ml whilst conversely enhancing their efficacy at the lower concentration of 8.65 µg ml, approximating the maximal physiological concentrations found in inflammatory exudates. Transcriptomic responses of the virulent strain UCBPP-PA14 to LPA were analysed using RNA-sequencing along with BioLog phenoarrays and whole cell assays in attempts to delineate possible mechanisms underlying these effects. The results strongly suggest involvement of LPA-induced carbon catabolite repression together with outer-membrane (OM) stress responses whilst raising questions about the effect of LPA upon other virulence factors including type III secretion. This could have clinical relevance as it suggests that endogenous LPA may, at concentrations found , differentially modulate antibiotic susceptibility of whilst simultaneously regulating expression of virulence factors, thereby influencing host–pathogen interactions during infection. The possibility of applying exogenous LPA locally as an enhancer of select antibiotics merits further investigation.

Funding
This study was supported by the:
  • Chief Scientist Office (Award TCS/16/24)
    • Principle Award Recipient: NicholasPeter Tucker
  • Biotechnology and Biological Sciences Research Council (Award BB/S507106/1)
    • Principle Award Recipient: NicholasPeter Tucker
  • Biotechnology and Biological Sciences Research Council (Award BB/V509243/1)
    • Principle Award Recipient: NicholasPeter Tucker
  • Biotechnology and Biological Sciences Research Council (Award BB/K019600/1)
    • Principle Award Recipient: NicholasPeter Tucker
  • This is an open-access article distributed under the terms of the Creative Commons Attribution License. This article was made open access via a Publish and Read agreement between the Microbiology Society and the corresponding author’s institution.
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2022-07-07
2024-12-12
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