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In-vitro Antibacterial Activity and Mechanism of Monarda Didyma Essential Oils Against Carbapenem-resistant Klebsiella Pneumoniae

Overview
Journal BMC Microbiol
Publisher Biomed Central
Specialty Microbiology
Date 2023 Sep 20
PMID 37730531
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Abstract

To fight the global epidemic of drug-resistant bacteria, essential oils have gained increasing attention as a new source of antibiotics. The antimicrobial activity of Monarda didyma essential oils (MDEO) for the Carbapenem-resistant Klebsiella pneumoniae (CRKP) strains were determined by agar disc diffusion assay and broth microdilution assay. To further understand MDEO efficacy, a time-growth curve was performed. The biofilm formation of CRKP were determined by crystalline violet staining method, additionally, changes in intracellular Adenosine triphosphate (ATP), protein, Alkaline phosphatase (AKP) activities, and membrane integrity were investigated to assess the influence of MDEO on cell membrane damage. Finally, the activities of key enzymes in the tricarboxylic acid (TCA) pathways and pentose phosphate (PPP) pathways were examined to determine the effect of MDEO on the respiratory metabolism of CRKP. This study presents the antibacterial mechanism of MDEO against CRKP with a minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) of 1.25 mg/ml. To understand MDEO efficacy, a time-kill kinetics approach was performed. The bactericidal effect of MDEO was evident at 2 h compared to the control at its MIC and 2MIC. Surface electron microscopic and ATP assay studies provided evidence for the multi-target action of MDEO against CRKP. MDEO could inhibit CRKP biofilm formation. MDEO could also cause irreversible damage to the CRKP cell membrane, resulting in the leakage of biological macromolecules (protein, ATP) and the reduction of intracellular enzymes (AKP) activities. Finally, MDEO affected the pathways of respiratory metabolism, such as PPP and TCA pathways. MDEO could reduce the activity of key enzymes (Glucose-6-phosphate dehydrogenase, citrate synthase, isocitrate dehydrogenase, and α-ketoglutarate dehydrogenase) in the PPP and TCA pathways to exert its biological effects against CRKP. These results suggest MDEO can exert inhibitory effects on CRKP, and potential mechanisms of action including inhibition of biofilm formation, damage of cell membrane structure and inhibition of energy metabolism.

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Thymol and carvacrol against : anti-bacterial, anti-biofilm, and synergistic activities-a systematic review.

Farhadi K, Rajabi E, Varpaei H, Iranzadasl M, Khodaparast S, Salehi M Front Pharmacol. 2024; 15:1487083.

PMID: 39512827 PMC: 11540684. DOI: 10.3389/fphar.2024.1487083.

References
1.
Nazzaro F, Fratianni F, De Martino L, Coppola R, De Feo V . Effect of essential oils on pathogenic bacteria. Pharmaceuticals (Basel). 2013; 6(12):1451-74. PMC: 3873673. DOI: 10.3390/ph6121451. View

2.
Di Vito M, Smolka A, Proto M, Barbanti L, Gelmini F, Napoli E . Is the Antimicrobial Activity of Hydrolates Lower than That of Essential Oils?. Antibiotics (Basel). 2021; 10(1). PMC: 7831920. DOI: 10.3390/antibiotics10010088. View

3.
Kim H, Lee S, Byun Y, Park H . 6-Gingerol reduces Pseudomonas aeruginosa biofilm formation and virulence via quorum sensing inhibition. Sci Rep. 2015; 5:8656. PMC: 4345325. DOI: 10.1038/srep08656. View

4.
Higgins D, Chang R, Debabov D, Leung J, Wu T, Krause K . Telavancin, a multifunctional lipoglycopeptide, disrupts both cell wall synthesis and cell membrane integrity in methicillin-resistant Staphylococcus aureus. Antimicrob Agents Chemother. 2005; 49(3):1127-34. PMC: 549257. DOI: 10.1128/AAC.49.3.1127-1134.2005. View

5.
Qian W, Zhang J, Wang W, Wang T, Liu M, Yang M . Antimicrobial and antibiofilm activities of paeoniflorin against carbapenem-resistant Klebsiella pneumoniae. J Appl Microbiol. 2019; 128(2):401-413. DOI: 10.1111/jam.14480. View