Biological effects of carvacrol and cinnamaldehyde on Acinetobacter baumannii
Acinetobacter baumannii has emerged as a major cause of nosocomial infections. The ability of A. baumannii to display various resistance mechanisms against antibiotics has transformed it into a successful nosocomial pathogen. The limited number of antibiotics in development and the disengagement of...
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doaj-33d154a6238c4dd4957fce87eeb7f40e2020-11-25T01:03:23ZengFrontiers Media S.A.Frontiers in Microbiology1664-302X2016-07-01710.3389/fmicb.2016.01133197842Biological effects of carvacrol and cinnamaldehyde on Acinetobacter baumanniiAngélique Montagu0Marie-Laure Joly-Guillou1Marie-Laure Joly-Guillou2Elisabeth Rossines3Jérome Cayon4Marie Kempf5Marie Kempf6Patrick Saulnier7INSERM U1066, Micro et Nanomédecines biomimétiques, IBS-CHUATOMyca, INSERM Atip-Avenir Team, CRCNA, INSERM U892, 6299 CNRSLaboratoire de bactériologie, IBS-CHUEydopharmaPlateforme d’analyse cellulaire et moléculaire (PACeM), IBS - CHUATOMyca, INSERM Atip-Avenir Team, CRCNA, INSERM U892, 6299 CNRSLaboratoire de bactériologie, IBS-CHUINSERM U1066, Micro et Nanomédecines biomimétiques, IBS-CHUAcinetobacter baumannii has emerged as a major cause of nosocomial infections. The ability of A. baumannii to display various resistance mechanisms against antibiotics has transformed it into a successful nosocomial pathogen. The limited number of antibiotics in development and the disengagement of the pharmaceutical industry have prompted the development of innovative strategies. One of these strategies is the use of essential oils, especially aromatic compounds that are potent antibacterial molecules. Among them, the combination of carvacrol and cinnamaldehyde has already demonstrated antibacterial efficacy against A. baumannii. The aim of this study was to determine the biological effects of these two compounds in A. baumannii, describing their effect on the rRNA and gene regulation under environmental stress conditions. Results demonstrated rRNA degradation by the carvacrol/cinnamaldehyde mixture, and this effect was due to carvacrol. Degradation was conserved after encapsulation of the mixture in lipid nanocapsules. Results showed an upregulation of the genes coding for heat shock proteins, such as groES, groEL, dnaK, clpB and the catalase katE, after exposure to carvacrol/cinnamaldehyde mixture. The catalase was upregulated after carvacrol exposure wich is related to an oxidative stress. The combination of thiourea (hydroxyl radical scavenger) and carvacrol demonstrated a potent bactericidal effect. These results underline the development of defense strategies of the bacteria by synthesis of reactive oxygen species (ROS) in response to environmental stress conditions, such as carvacrol.http://journal.frontiersin.org/Journal/10.3389/fmicb.2016.01133/fullAcinetobacter baumanniiCatalaseReactive Oxygen SpeciesHeat shock proteinsDefense Mechanismscarvacrol |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Angélique Montagu Marie-Laure Joly-Guillou Marie-Laure Joly-Guillou Elisabeth Rossines Jérome Cayon Marie Kempf Marie Kempf Patrick Saulnier |
spellingShingle |
Angélique Montagu Marie-Laure Joly-Guillou Marie-Laure Joly-Guillou Elisabeth Rossines Jérome Cayon Marie Kempf Marie Kempf Patrick Saulnier Biological effects of carvacrol and cinnamaldehyde on Acinetobacter baumannii Frontiers in Microbiology Acinetobacter baumannii Catalase Reactive Oxygen Species Heat shock proteins Defense Mechanisms carvacrol |
author_facet |
Angélique Montagu Marie-Laure Joly-Guillou Marie-Laure Joly-Guillou Elisabeth Rossines Jérome Cayon Marie Kempf Marie Kempf Patrick Saulnier |
author_sort |
Angélique Montagu |
title |
Biological effects of carvacrol and cinnamaldehyde on Acinetobacter baumannii |
title_short |
Biological effects of carvacrol and cinnamaldehyde on Acinetobacter baumannii |
title_full |
Biological effects of carvacrol and cinnamaldehyde on Acinetobacter baumannii |
title_fullStr |
Biological effects of carvacrol and cinnamaldehyde on Acinetobacter baumannii |
title_full_unstemmed |
Biological effects of carvacrol and cinnamaldehyde on Acinetobacter baumannii |
title_sort |
biological effects of carvacrol and cinnamaldehyde on acinetobacter baumannii |
publisher |
Frontiers Media S.A. |
series |
Frontiers in Microbiology |
issn |
1664-302X |
publishDate |
2016-07-01 |
description |
Acinetobacter baumannii has emerged as a major cause of nosocomial infections. The ability of A. baumannii to display various resistance mechanisms against antibiotics has transformed it into a successful nosocomial pathogen. The limited number of antibiotics in development and the disengagement of the pharmaceutical industry have prompted the development of innovative strategies. One of these strategies is the use of essential oils, especially aromatic compounds that are potent antibacterial molecules. Among them, the combination of carvacrol and cinnamaldehyde has already demonstrated antibacterial efficacy against A. baumannii. The aim of this study was to determine the biological effects of these two compounds in A. baumannii, describing their effect on the rRNA and gene regulation under environmental stress conditions. Results demonstrated rRNA degradation by the carvacrol/cinnamaldehyde mixture, and this effect was due to carvacrol. Degradation was conserved after encapsulation of the mixture in lipid nanocapsules. Results showed an upregulation of the genes coding for heat shock proteins, such as groES, groEL, dnaK, clpB and the catalase katE, after exposure to carvacrol/cinnamaldehyde mixture. The catalase was upregulated after carvacrol exposure wich is related to an oxidative stress. The combination of thiourea (hydroxyl radical scavenger) and carvacrol demonstrated a potent bactericidal effect. These results underline the development of defense strategies of the bacteria by synthesis of reactive oxygen species (ROS) in response to environmental stress conditions, such as carvacrol. |
topic |
Acinetobacter baumannii Catalase Reactive Oxygen Species Heat shock proteins Defense Mechanisms carvacrol |
url |
http://journal.frontiersin.org/Journal/10.3389/fmicb.2016.01133/full |
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