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Vanilla modulates the activity of antibiotics and inhibits efflux pumps in drug-resistant Pseudomonas aeruginosa

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Abstract

Vanilla, a popular flavour extracted from Vanilla planifolia pods was tested for its antibiotic modulatory activity against extensively drug-resistant (XDR) Pseudomonas aeruginosa clinical isolates. Cured vanilla pod extract (VPE) was found non-bactericidal even at high doses (> 2000 µg/mL), however, it modulated the activity of several antibiotics at a sub-inhibitory concentration of 500 µg/mL. This modulation activity of VPE was observed for last line antibiotic options such as meropenem and tigecycline, as well as commonly used antibiotics like ciprofloxacin, levofloxacin and chloramphenicol. Further, it was observed that VPE inhibited the activity of efflux pumps in XDR P. aeruginosa clinical isolates. GC-MS spectral analysis revealed the dominance of vanillin, furfuran and some short-chain fatty acids in VPE. Therefore, further studies on the constituent ingredients in VPE are recommended to identify the active compounds and use them as antibiotic modulators and efflux pump inhibitors.

Graphical abstract

Vanilla extract inhibits dominant efflux pump in Pseudomonas aeruginosa and modulates the activity of last line and commonly used antibiotics

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Abbreviations

VPE:

Vanilla pod extract

PA:

Pseudomonas aeruginosa

MDR:

Multidrug-resistant

XDR:

Extensively drug-resistant

EtBr:

Ethidium bromide

ESβLs:

Extended spectrum β-lactamases

MBLs:

Metallo-β-lactamases

KPCs:

Klebsiella pneumoniae Carbapenemases

MIC:

Minimum inhibitory concentration

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Acknowledgements

The authors extend sincere thanks to Dr.Renu Bharadwaj, Head of Department, Microbiology, B. J. Govt. Medical College, Pune – 411001, India and Golwilkar Metropolis Health Services India, Pvt. Ltd., Pune – 411004, India for providing clinical isolates. Sagar Arya is the recipient of a Deakin University (Australia) post-graduate scholarship.

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Correspondence to Sangram K. Lenka.

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Arya, S.S., Sharma, M.M., Rookes, J.E. et al. Vanilla modulates the activity of antibiotics and inhibits efflux pumps in drug-resistant Pseudomonas aeruginosa. Biologia 76, 781–791 (2021). https://doi.org/10.2478/s11756-020-00617-5

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  • DOI: https://doi.org/10.2478/s11756-020-00617-5

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