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Bacterial Drug Efflux Pump Inhibitors from Plants

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Antimicrobial Resistance

Abstract

The current global antimicrobial resistance (AMR) crisis is a serious hazard to public health, food security, and development. Drug-resistant pathogens diminish the effectiveness of conventional antibiotics, thereby leading to frequent therapeutic failures and reducing the available antibiotic armory. There is an increasing risk of therapeutic impasse if no action is taken now. Novel resistance modalities are appearing within bacterial species and disseminating worldwide, undermining our ability to cure common infectious diseases. Among the identified resistance strategies developed by bacteria, efflux pump systems (EPs) are widely acknowledged as the main mechanism leading to multidrug resistance (MDR). MDR is concomitant with the overexpression of the transporters (EPs) that identify and pump out from the cell a large array of structurally dissimilar compounds. The antibiotic pipeline is narrow, and the paucity of novel antimicrobial therapeutics in development is a growing concern. The inhibition of EPs in bacteria appears as a successful alternative in the fight against AMR. Indeed, efflux pump inhibitors (EPIs) offer considerable promise as therapeutic agents, under the hypothesis that they would increase the intracellular concentration of standard antibiotics and hence restore their antimicrobial activity. Considering the cellular toxicity of known synthetic EPIs, investigations are increasingly directed towards the discovery of naturally occurring agents. Plant-derived compounds are found as one of the most dependable sources of safe EPIs. In recent years, a plethora of plant-derived EPIs have been described, although so far, no compound has yet passed all the stages of drug development. The difficulties in developing plant-derived EPI drugs are ascribed to the complexity of EPs, the structural and functional requirements of EPIs, and their cellular toxicity and side effects. In this chapter, we emphasize the roles of EPs in multidrug resistance, describe the major plant-based EPIs, and lay out the challenges impeding the development of plant-derived EPI drugs.

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Abbreviations

ABC:

Adenosine triphosphate (ATP)-binding cassette

AMR:

Antimicrobial resistance

EPIs:

Efflux pump inhibitors

EPs:

Efflux pump systems

EtBr:

Ethidium bromide

MATE:

Multidrug and toxic extrusion

MDR:

Multidrug resistance

MFS:

Major facilitator superfamily

PACE:

Proteobacterial antimicrobial compound efflux

PDR:

Pandrug resistant

RND:

Resistance-nodulation-cell division

SMR:

Small multidrug resistance

XDR:

Extensively drug resistant

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Correspondence to Armel Jackson Seukep .

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© 2022 The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

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Seukep, A.J. et al. (2022). Bacterial Drug Efflux Pump Inhibitors from Plants. In: Kumar, V., Shriram, V., Paul, A., Thakur, M. (eds) Antimicrobial Resistance. Springer, Singapore. https://doi.org/10.1007/978-981-16-3120-7_16

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