Universität zu Köln

Singkham-In, Uthaibhorn, Higgins, Paul G. ORCID: 0000-0001-8677-9454, Wannigama, Dhammika Leshan, Hongsing, Parichart and Chatsuwan, Tanittha (2020). Rescued chlorhexidine activity by resveratrol against carbapenem-resistant Acinetobacter baumannii via down-regulation of AdeB efflux pump. PLoS One, 15 (12). SAN FRANCISCO: PUBLIC LIBRARY SCIENCE. ISSN 1932-6203

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Abstract

The aim of this study was to determine the activity and synergistic mechanisms of resveratrol in combination with chlorhexidine against carbapenem-resistant Acinetobacter baumannii clinical isolates. The activity of resveratrol plus antimicrobial agents was determined by checkerboard and time-kill assay against carbapenem-resistant A. baumannii isolated from patients at the King Chulalongkorn Memorial Hospital, Bangkok, Thailand. Overexpression of efflux pumps that mediates chlorhexidine susceptibility was characterized by the ethidium bromide accumulation assay. The effect of resveratrol on the expression of efflux pump genes (adeB, adeJ, adeG abeS, and aceI) and the two-component regulators, adeR and adeS was determined by RT-qPCR. The combination of resveratrol and chlorhexidine resulted in strong synergistic and bactericidal activity against carbapenem-resistant A. baumannii. Up-regulation of adeB and aceI was induced by chlorhexidine. However, the addition of resveratrol increased chlorhexidine susceptibility with increased intracellular accumulation of ethidium bromide in A. baumannii indicating that resveratrol acts as an efflux pump inhibitor. Expression of adeB was significantly reduced in the combination of resveratrol with chlorhexidine indicating that resveratrol inhibits the AdeB efflux pump and restores chlorhexidine effect on A. baumannii. In conclusion, reduced adeB expression in A. baumannii was mediated by resveratrol suggesting that AdeB efflux pump inhibition contributes to the synergistic mechanism of resveratrol with chlorhexidine. Our finding highlights the potential importance of resveratrol in clinical applications.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Singkham-In, Uthaibhorn UNSPECIFIED UNSPECIFIED UNSPECIFIED Higgins, Paul G. UNSPECIFIED orcid.org/0000-0001-8677-9454 UNSPECIFIED Wannigama, Dhammika Leshan UNSPECIFIED UNSPECIFIED UNSPECIFIED Hongsing, Parichart UNSPECIFIED UNSPECIFIED UNSPECIFIED Chatsuwan, Tanittha UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-308771
DOI:	10.1371/journal.pone.0243082
Journal or Publication Title:	PLoS One
Volume:	15
Number:	12
Date:	2020
Publisher:	PUBLIC LIBRARY SCIENCE
Place of Publication:	SAN FRANCISCO
ISSN:	1932-6203
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language LISTERIA-MONOCYTOGENES; COMBINATION THERAPY; CLINICAL-OUTCOMES; MULTIPLEX PCR; CHALLENGE; EMERGENCE; COLISTIN; SYNERGY; ADEIJK; ADEABC Multiple languages Multidisciplinary Sciences Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/30877