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Combarros-Fuertes P, Estevinho LM, Teixeira-Santos R, Rodrigues AG, Pina-Vaz C, Fresno JM, Tornadijo ME. Evaluation of Physiological Effects Induced by Manuka Honey Upon Staphylococcus aureus and Escherichia coli. Microorganisms 2019; 7:microorganisms7080258. [PMID: 31412630 PMCID: PMC6722746 DOI: 10.3390/microorganisms7080258] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2019] [Revised: 08/08/2019] [Accepted: 08/09/2019] [Indexed: 11/16/2022] Open
Abstract
Several studies have explored the antimicrobial properties of manuka honey (MkH). However, the data available regarding antibacterial action mechanisms are scarcer. The aim of this study was to scrutinize and characterize primary effects of manuka honey (MkH) upon the physiological status of Staphylococcus aureus and Escherichia coli (as Gram-positive and Gram-negative bacteria models, respectively), using flow cytometry (FC) to reveal its antibacterial action mechanisms. Effects of MkH on membrane potential, membrane integrity and metabolic activity were assessed using different fluorochromes in a 180 min time course assay. Time-kill experiments were carried out under the same conditions. Additionally, MkH effect on efflux pumps was also studied in an E. coli strain with an over-expression of several efflux pumps. Exposure of bacteria to MkH resulted in physiological changes related to membrane potential and membrane integrity; these effects displayed slight differences among bacteria. MkH induced a remarkable metabolic disruption as primary physiological effect upon S. aureus and was able to block efflux pump activity in a dose-dependent fashion in the E. coli strain.
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Affiliation(s)
- Patricia Combarros-Fuertes
- Department of Food Hygiene and Technology, Faculty of Veterinary Science, University of León, Campus de Vegazana, 24071 León, Spain.
| | - Leticia M Estevinho
- Mountain Research Center (CIMO), Polytechnic Institute of Bragança, Campus Santa Apolónia, 5301-855 Bragança, Portugal
| | - Rita Teixeira-Santos
- Division of Microbiology, Department of Pathology, Faculty of Medicine, University of Porto, 4200-319 Porto, Portugal
| | - Acácio G Rodrigues
- Division of Microbiology, Department of Pathology, Faculty of Medicine, University of Porto, 4200-319 Porto, Portugal
- Center for Research in Health Technologies and Information Systems (CINTESIS), Faculty of Medicine, University of Porto, 4200-450 Porto, Portugal
- Burn Unit, Department of Plastic and Reconstructive Surgery, Hospital São João, 4200-319 Porto, Portugal
| | - Cidália Pina-Vaz
- Division of Microbiology, Department of Pathology, Faculty of Medicine, University of Porto, 4200-319 Porto, Portugal
- Center for Research in Health Technologies and Information Systems (CINTESIS), Faculty of Medicine, University of Porto, 4200-450 Porto, Portugal
| | - Jose M Fresno
- Department of Food Hygiene and Technology, Faculty of Veterinary Science, University of León, Campus de Vegazana, 24071 León, Spain
| | - M Eugenia Tornadijo
- Department of Food Hygiene and Technology, Faculty of Veterinary Science, University of León, Campus de Vegazana, 24071 León, Spain
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Does the use of antifungal agents in agriculture and food foster polyene resistance development? A reason for concern. J Glob Antimicrob Resist 2018; 13:40-48. [DOI: 10.1016/j.jgar.2017.10.024] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2017] [Revised: 10/03/2017] [Accepted: 10/30/2017] [Indexed: 01/11/2023] Open
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Increasing the Fungicidal Action of Amphotericin B by Inhibiting the Nitric Oxide-Dependent Tolerance Pathway. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2017; 2017:4064628. [PMID: 29129987 PMCID: PMC5654257 DOI: 10.1155/2017/4064628] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/18/2017] [Accepted: 08/02/2017] [Indexed: 11/21/2022]
Abstract
Amphotericin B (AmB) induces oxidative and nitrosative stresses, characterized by production of reactive oxygen and nitrogen species, in fungi. Yet, how these toxic species contribute to AmB-induced fungal cell death is unclear. We investigated the role of superoxide and nitric oxide radicals in AmB's fungicidal activity in Saccharomyces cerevisiae, using a digital microfluidic platform, which enabled monitoring individual cells at a spatiotemporal resolution, and plating assays. The nitric oxide synthase inhibitor L-NAME was used to interfere with nitric oxide radical production. L-NAME increased and accelerated AmB-induced accumulation of superoxide radicals, membrane permeabilization, and loss of proliferative capacity in S. cerevisiae. In contrast, the nitric oxide donor S-nitrosoglutathione inhibited AmB's action. Hence, superoxide radicals were important for AmB's fungicidal action, whereas nitric oxide radicals mediated tolerance towards AmB. Finally, also the human pathogens Candida albicans and Candida glabrata were more susceptible to AmB in the presence of L-NAME, pointing to the potential of AmB-L-NAME combination therapy to treat fungal infections.
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Pina-Vaz C, Costa-de-Oliveira S, Silva-Dias A, Silva AP, Teixeira-Santos R, Rodrigues AG. Flow Cytometry in Microbiology: The Reason and the Need. ACTA ACUST UNITED AC 2017. [DOI: 10.1007/978-981-10-4499-1_7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/12/2023]
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Teixeira-Santos R, Ricardo E, Branco RJ, Azevedo MM, Rodrigues AG, Pina-Vaz C. Unveiling the Synergistic Interaction Between Liposomal Amphotericin B and Colistin. Front Microbiol 2016; 7:1439. [PMID: 27679618 PMCID: PMC5020089 DOI: 10.3389/fmicb.2016.01439] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2016] [Accepted: 08/30/2016] [Indexed: 01/21/2023] Open
Abstract
Patients with multiple comorbidities are often administered simultaneously or sequentially antifungals and antibacterial agents, without full knowledge of the consequences of drug interactions. Considering the clinical relevance of liposomal amphotericin B (L-AMB), the association between L-AMB and six antibacterial agents was evaluated against four clinical isolates and one type strain of Candida spp. and two clinical isolates and one type strain of Aspergillus fumigatus. In order to evaluate such combined effects, the minimal inhibitory concentration (MIC) of L-AMB was determined in the presence of 0.5-, 1-, 2-, and 4-fold peak plasma concentrations of each of the antibacterial drugs. Since the L-AMB/colistin (CST) association was the most synergic, viability assays were performed and the physiological status induced by this association was characterized. In addition, computational molecular dynamics studies were also performed in order to clarify the molecular interaction. The maximum synergistic effect with all antibacterial agents, except CST, was reached at fourfold the usual peak plasma concentrations, resulting in 2-to 8-fold L-AMB MIC reduction for Candida and 2-to 16-fold for Aspergillus. For CST, the greatest synergism was registered at peak plasma concentration (3 mg/L), with 4-to 8-fold L-AMB MIC reduction for Candida and 16-to 32-fold for Aspergillus. L-AMB at subinhibitory concentration (0.125 mg/L) combined with CST 3 mg/L resulted in: a decrease of fungal cell viability; an increase of cell membrane permeability; an increase of cellular metabolic activity soon after 1 h of exposure, which decreased until 24 h; and an increase of ROS production up to 24 h. From the molecular dynamics studies, AMB and CST molecules shown a propensity to form a stable molecular complex in solution, conferring a recognition and binding added value for membrane intercalation. Our results demonstrate that CST interacts synergistically with L-AMB, forming a stable complex, which promotes the fungicidal activity of L-AMB at low concentration.
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Affiliation(s)
- Rita Teixeira-Santos
- Department of Microbiology, Faculty of Medicine, University of Porto Porto, Portugal
| | - Elisabete Ricardo
- Department of Microbiology, Faculty of Medicine, University of PortoPorto, Portugal; CINTESIS - Center for Research in Health Technologies and Information Systems, Faculty of Medicine, University of PortoPorto, Portugal
| | - Ricardo J Branco
- UCIBIO-REQUIMTE - Department of Chemistry, Faculty of Science and Technology, Universidade NOVA de Lisboa Lisboa, Portugal
| | - Maria M Azevedo
- Department of Microbiology, Faculty of Medicine, University of PortoPorto, Portugal; CINTESIS - Center for Research in Health Technologies and Information Systems, Faculty of Medicine, University of PortoPorto, Portugal
| | - Acácio G Rodrigues
- Department of Microbiology, Faculty of Medicine, University of PortoPorto, Portugal; CINTESIS - Center for Research in Health Technologies and Information Systems, Faculty of Medicine, University of PortoPorto, Portugal; Burn Unit, Department of Plastic and Reconstructive Surgery, Hospital São JoãoPorto, Portugal
| | - Cidália Pina-Vaz
- Department of Microbiology, Faculty of Medicine, University of PortoPorto, Portugal; CINTESIS - Center for Research in Health Technologies and Information Systems, Faculty of Medicine, University of PortoPorto, Portugal; Department of Microbiology, Hospital São JoãoPorto, Portugal
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