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Mudgil U, Khullar L, Chadha J, Prerna, Harjai K. Beyond antibiotics: Emerging antivirulence strategies to combat Pseudomonas aeruginosa in cystic fibrosis. Microb Pathog 2024; 193:106730. [PMID: 38851361 DOI: 10.1016/j.micpath.2024.106730] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2024] [Revised: 06/03/2024] [Accepted: 06/05/2024] [Indexed: 06/10/2024]
Abstract
Pseudomonas aeruginosa is an opportunistic pathogen that poses a significant threat to individuals suffering from cystic fibrosis (CF). The pathogen is highly prevalent in CF individuals and is responsible for chronic infection, resulting in severe tissue damage and poor patient outcome. Prolonged antibiotic administration has led to the emergence of multidrug resistance in P. aeruginosa. In this direction, antivirulence strategies achieving targeted inhibition of bacterial virulence pathways, including quorum sensing, efflux pumps, lectins, and iron chelators, have been explored against CF isolates of P. aeruginosa. Hence, this review article presents a bird's eye view on the pulmonary infections involving P. aeruginosa in CF patients by laying emphasis on factors contributing to bacterial colonization, persistence, and disease progression along with the current line of therapeutics against P. aeruginosa in CF. We further collate scientific literature and discusses various antivirulence strategies that have been tested against P. aeruginosa isolates from CF patients.
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Affiliation(s)
- Umang Mudgil
- Department of Microbiology, Panjab University, Chandigarh, India
| | - Lavanya Khullar
- Department of Microbiology, Panjab University, Chandigarh, India
| | - Jatin Chadha
- Department of Microbiology, Panjab University, Chandigarh, India
| | - Prerna
- Department of Microbiology, Panjab University, Chandigarh, India
| | - Kusum Harjai
- Department of Microbiology, Panjab University, Chandigarh, India.
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2
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Grassi L, Asfahl KL, Van den Bossche S, Maenhout I, Sass A, Vande Weygaerde Y, Van Braeckel E, Verhasselt B, Boelens J, Tunney MM, Dandekar AA, Coenye T, Crabbé A. Antibiofilm activity of Prevotella species from the cystic fibrosis lung microbiota against Pseudomonas aeruginosa. Biofilm 2024; 7:100206. [PMID: 38975276 PMCID: PMC11225020 DOI: 10.1016/j.bioflm.2024.100206] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2024] [Revised: 05/06/2024] [Accepted: 06/06/2024] [Indexed: 07/09/2024] Open
Abstract
It is increasingly recognized that interspecies interactions may modulate the pathogenicity of Pseudomonas aeruginosa during chronic lung infections. Nevertheless, while the interaction between P. aeruginosa and pathogenic microorganisms co-infecting the lungs has been widely investigated, little is known about the influence of other members of the lung microbiota on the infection process. In this study, we focused on investigating the impact of Prevotella species isolated from the sputum of people with cystic fibrosis (pwCF) on biofilm formation and virulence factor production by P. aeruginosa. Screening of a representative collection of Prevotella species recovered from clinical samples showed that several members of this genus (8 out 10 isolates) were able to significantly reduce biofilm formation of P. aeruginosa PAO1, without impact on growth. Among the tested isolates, the strongest biofilm-inhibitory activity was observed for Prevotella intermedia and Prevotella nigrescens, which caused a reduction of up to 90% in the total biofilm biomass of several P. aeruginosa isolates from pwCF. In addition, a strain-specific effect of P. nigrescens on the ability of P. aeruginosa to produce proteases and pyocyanin was observed, with significant alterations in the levels of these virulence factors detected in LasR mutant strains. Overall, these results suggest that non-pathogenic bacteria from the lung microbiota may regulate pathogenicity traits of P. aeruginosa, and possibly affect the outcome of chronic lung infections.
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Affiliation(s)
- Lucia Grassi
- Laboratory of Pharmaceutical Microbiology, Ghent University, Ghent, Belgium
| | - Kyle L. Asfahl
- Department of Microbiology, University of Washington, Seattle, WA, USA
| | | | - Ine Maenhout
- Laboratory of Pharmaceutical Microbiology, Ghent University, Ghent, Belgium
| | - Andrea Sass
- Laboratory of Pharmaceutical Microbiology, Ghent University, Ghent, Belgium
| | - Yannick Vande Weygaerde
- Cystic Fibrosis Reference Centre, Department of Respiratory Medicine, Ghent University Hospital, Ghent, Belgium
| | - Eva Van Braeckel
- Cystic Fibrosis Reference Centre, Department of Respiratory Medicine, Ghent University Hospital, Ghent, Belgium
- Department of Internal Medicine and Paediatrics, Ghent University, Ghent, Belgium
| | - Bruno Verhasselt
- Laboratory of Medical Microbiology, Ghent University Hospital, Ghent, Belgium
- Department of Diagnostic Sciences, Ghent University, Ghent, Belgium
| | - Jerina Boelens
- Laboratory of Medical Microbiology, Ghent University Hospital, Ghent, Belgium
- Department of Diagnostic Sciences, Ghent University, Ghent, Belgium
| | - Michael M. Tunney
- School of Pharmacy, Queen's University Belfast, Belfast, Northern Ireland, UK
| | - Ajai A. Dandekar
- Department of Microbiology, University of Washington, Seattle, WA, USA
| | - Tom Coenye
- Laboratory of Pharmaceutical Microbiology, Ghent University, Ghent, Belgium
| | - Aurélie Crabbé
- Laboratory of Pharmaceutical Microbiology, Ghent University, Ghent, Belgium
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3
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Leroy AG, Caillon J, Broquet A, Lemabecque V, Delanou S, Caroff N, Asehnoune K, Roquilly A, Crémet L. Azithromycin regulates bacterial virulence and immune response in a murine model of ceftazidime-treated Pseudomonas aeruginosa acute pneumonia. Microbiol Immunol 2024; 68:27-35. [PMID: 38073281 DOI: 10.1111/1348-0421.13106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2023] [Revised: 11/06/2023] [Accepted: 11/16/2023] [Indexed: 02/07/2024]
Abstract
Pseudomonas aeruginosa (PA) remains one of the leading causes of nosocomial acute pneumonia. The array of virulence factors expressed by PA and the intense immune response associated with PA pneumonia play a major role in the severity of these infections. New therapeutic approaches are needed to overcome the high resistance of PA to antibiotics and to reduce the direct damage to host tissues. Through its immunomodulatory and anti-virulence effects, azithromycin (AZM) has demonstrated clinical benefits in patients with chronic PA respiratory infections. However, there is relatively little evidence in PA acute pneumonia. We investigated the effects of AZM, as an adjunctive therapy combined with ceftazidime (CAZ), in a murine model of PA acute pneumonia. We observed that the combined therapy (i) reduces the weight loss of mice 24 h post-infection (hpi), (ii) decreases neutrophil influx into the lungs at 6 and 24 hpi, while this effect is absent in a LPS-induced pneumonia or when PA is pretreated with antibiotics and mice do not receive any antibiotics, and that (iii) AZM, alone or with CAZ, modulates the expression of PA quorum sensing regulators and virulence factors (LasI, LasA, PqsE, PhzM, ExoS). Our findings support beneficial effects of AZM with CAZ on PA acute pneumonia by both bacterial virulence and immune response modulations. Further investigations are needed to clarify the exact underlying mechanisms responsible for the reduction of the neutrophils influx and to better discriminate between direct immunomodulatory properties of AZM, and indirect effects on neutrophilia resulting from bacterial virulence modulation.
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Affiliation(s)
- A-G Leroy
- Center for Research in Transplantation and Translational Immunology, Nantes Université, CHU Nantes, INSERM, Nantes, France
- CHU de Nantes, Service de Bactériologie-Hygiène Hospitalière, Nantes Université, Nantes, France
| | - J Caillon
- Center for Research in Transplantation and Translational Immunology, Nantes Université, CHU Nantes, INSERM, Nantes, France
- CHU de Nantes, Service de Bactériologie-Hygiène Hospitalière, Nantes Université, Nantes, France
| | - A Broquet
- Center for Research in Transplantation and Translational Immunology, Nantes Université, CHU Nantes, INSERM, Nantes, France
| | - V Lemabecque
- Center for Research in Transplantation and Translational Immunology, Nantes Université, CHU Nantes, INSERM, Nantes, France
| | - S Delanou
- Center for Research in Transplantation and Translational Immunology, Nantes Université, CHU Nantes, INSERM, Nantes, France
| | - N Caroff
- Center for Research in Transplantation and Translational Immunology, Nantes Université, CHU Nantes, INSERM, Nantes, France
| | - K Asehnoune
- Center for Research in Transplantation and Translational Immunology, Nantes Université, CHU Nantes, INSERM, Nantes, France
- Service Anesthésie Réanimation Chirurgicale, CHU de Nantes, Nantes Université, Nantes, France
| | - A Roquilly
- Center for Research in Transplantation and Translational Immunology, Nantes Université, CHU Nantes, INSERM, Nantes, France
- Service Anesthésie Réanimation Chirurgicale, CHU de Nantes, Nantes Université, Nantes, France
| | - L Crémet
- Center for Research in Transplantation and Translational Immunology, Nantes Université, CHU Nantes, INSERM, Nantes, France
- CHU de Nantes, Service de Bactériologie-Hygiène Hospitalière, Nantes Université, Nantes, France
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4
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Sandri A, Saitta GM, Veschetti L, Boschi F, Passarelli Mantovani R, Carelli M, Melotti P, Signoretto C, Boaretti M, Malerba G, Lleò MM. In Vivo Inflammation Caused by Achromobacter spp. Cystic Fibrosis Clinical Isolates Exhibiting Different Pathogenic Characteristics. Int J Mol Sci 2023; 24:ijms24087432. [PMID: 37108596 PMCID: PMC10139000 DOI: 10.3390/ijms24087432] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2023] [Revised: 04/06/2023] [Accepted: 04/13/2023] [Indexed: 04/29/2023] Open
Abstract
Achromobacter spp. lung infection in cystic fibrosis has been associated with inflammation, increased frequency of exacerbations, and decline of respiratory function. We aimed to evaluate in vivo the inflammatory effects of clinical isolates exhibiting different pathogenic characteristics. Eight clinical isolates were selected based on different pathogenic characteristics previously assessed: virulence in Galleria mellonella larvae, cytotoxicity in human bronchial epithelial cells, and biofilm formation. Acute lung infection was established by intratracheal instillation with 10.5 × 108 bacterial cells in wild-type and CFTR-knockout (KO) mice expressing a luciferase gene under control of interleukin-8 promoter. Lung inflammation was monitored by in vivo bioluminescence imaging up to 48 h after infection, and mortality was recorded up to 96 h. Lung bacterial load was evaluated by CFU count. Virulent isolates caused higher lung inflammation and mice mortality, especially in KO animals. Isolates both virulent and cytotoxic showed higher persistence in mice lungs, while biofilm formation was not associated with lung inflammation, mice mortality, or bacterial persistence. A positive correlation between virulence and lung inflammation was observed. These results indicate that Achromobacter spp. pathogenic characteristics such as virulence and cytotoxicity may be associated with clinically relevant effects and highlight the importance of elucidating their mechanisms.
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Affiliation(s)
- Angela Sandri
- Department of Diagnostics and Public Health, Microbiology Section, University of Verona, 37134 Verona, Italy
| | - Giulia Maria Saitta
- Department of Diagnostics and Public Health, Microbiology Section, University of Verona, 37134 Verona, Italy
| | - Laura Veschetti
- GMLab, Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, 37134 Verona, Italy
| | - Federico Boschi
- Department of Engineering for Innovation Medicine, University of Verona, 37134 Verona, Italy
| | - Rebeca Passarelli Mantovani
- Department of Diagnostics and Public Health, Microbiology Section, University of Verona, 37134 Verona, Italy
| | - Maria Carelli
- Department of Diagnostics and Public Health, Microbiology Section, University of Verona, 37134 Verona, Italy
| | - Paola Melotti
- Cystic Fibrosis Center, Azienda Ospedaliera Universitaria Integrata Verona, 37126 Verona, Italy
| | - Caterina Signoretto
- Department of Diagnostics and Public Health, Microbiology Section, University of Verona, 37134 Verona, Italy
| | - Marzia Boaretti
- Department of Diagnostics and Public Health, Microbiology Section, University of Verona, 37134 Verona, Italy
| | - Giovanni Malerba
- GMLab, Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, 37134 Verona, Italy
| | - Maria M Lleò
- Department of Diagnostics and Public Health, Microbiology Section, University of Verona, 37134 Verona, Italy
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5
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Jeong GJ, Khan F, Khan S, Tabassum N, Mehta S, Kim YM. Pseudomonas aeruginosa virulence attenuation by inhibiting siderophore functions. Appl Microbiol Biotechnol 2023; 107:1019-1038. [PMID: 36633626 DOI: 10.1007/s00253-022-12347-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2022] [Revised: 12/16/2022] [Accepted: 12/20/2022] [Indexed: 01/13/2023]
Abstract
Pseudmonas aeruginosa is a Gram-negative bacterium known to be ubiquitous and recognized as one of the leading causes of infections such as respiratory, urinary tract, burns, cystic fibrosis, and in immunocompromised individuals. Failure of antimicrobial therapy has been documented to be attributable due to the development of various resistance mechanisms, with a proclivity to develop additional resistance mechanisms rapidly. P. aeruginosa virulence attenuation is an alternate technique for disrupting pathogenesis without impacting growth. The iron-scavenging siderophores (pyoverdine and pyochelin) generated by P. aeruginosa have various properties like scavenging iron, biofilm formation, quorum sensing, increasing virulence, and toxicity to the host. As a result, developing an antivirulence strategy, specifically inhibiting the P. aeruginosa siderophore, has been a promising therapeutic option to limit their infection. Several natural, synthetic compounds and nanoparticles have been identified as potent inhibitors of siderophore production/biosynthesis, function, and transport system. The current review discussed pyoverdine and pyochelin's synthesis and transport system in P. aeruginosa. Furthermore, it is also focused on the role of several natural and synthetic compounds in reducing P. aeruginosa virulence by inhibiting siderophore synthesis, function, and transport. The underlying mechanism involved in inhibiting the siderophore by natural and synthetic compounds has also been explained. KEY POINTS: • Pseudomonas aeruginosa is an opportunistic pathogen linked to chronic respiratory, urinary tract, and burns infections, as well as cystic fibrosis and immunocompromised patients. • P. aeruginosa produces two virulent siderophores forms: pyoverdine and pyochelin, which help it to survive in iron-deficient environments. • The inhibition of siderophore production, transport, and activity using natural and synthesized drugs has been described as a potential strategy for controlling P. aeruginosa infection.
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Affiliation(s)
- Geum-Jae Jeong
- Department of Food Science and Technology, Pukyong National University, Busan, 48513, Republic of Korea
| | - Fazlurrahman Khan
- Marine Integrated Biomedical Technology Center, The National Key Research Institutes in Universities, Pukyong National University, Busan, 48513, Republic of Korea. .,Research Center for Marine Integrated Bionics Technology, Pukyong National University, Busan, 48513, Republic of Korea.
| | - Sohail Khan
- Department of Biotechnology, Jaypee Institute of Information Technology, A-10, Sector-62, Noida, Uttar Pradesh, 201309, India
| | - Nazia Tabassum
- Marine Integrated Biomedical Technology Center, The National Key Research Institutes in Universities, Pukyong National University, Busan, 48513, Republic of Korea.,Research Center for Marine Integrated Bionics Technology, Pukyong National University, Busan, 48513, Republic of Korea
| | - Sonu Mehta
- Anthem Biosciences Private Limited, Bommasandra, Bangalore, Karnataka, 56009, India
| | - Young-Mog Kim
- Department of Food Science and Technology, Pukyong National University, Busan, 48513, Republic of Korea. .,Marine Integrated Biomedical Technology Center, The National Key Research Institutes in Universities, Pukyong National University, Busan, 48513, Republic of Korea. .,Research Center for Marine Integrated Bionics Technology, Pukyong National University, Busan, 48513, Republic of Korea.
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6
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Pseudomonas aeruginosa: Infections, Animal Modeling, and Therapeutics. Cells 2023; 12:cells12010199. [PMID: 36611992 PMCID: PMC9818774 DOI: 10.3390/cells12010199] [Citation(s) in RCA: 36] [Impact Index Per Article: 36.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2022] [Revised: 12/20/2022] [Accepted: 12/21/2022] [Indexed: 01/05/2023] Open
Abstract
Pseudomonas aeruginosa is an important Gram-negative opportunistic pathogen which causes many severe acute and chronic infections with high morbidity, and mortality rates as high as 40%. What makes P. aeruginosa a particularly challenging pathogen is its high intrinsic and acquired resistance to many of the available antibiotics. In this review, we review the important acute and chronic infections caused by this pathogen. We next discuss various animal models which have been developed to evaluate P. aeruginosa pathogenesis and assess therapeutics against this pathogen. Next, we review current treatments (antibiotics and vaccines) and provide an overview of their efficacies and their limitations. Finally, we highlight exciting literature on novel antibiotic-free strategies to control P. aeruginosa infections.
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7
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Anju VT, Busi S, Kumar S, Suchiang K, Kumavath R, Ranganathan S, Ampasala DR, Dyavaiah M. Alantolactone modulates the production of quorum sensing mediated virulence factors and biofilm formation in Pseudomonas aeruginosa. BIOFOULING 2022; 38:331-347. [PMID: 35469529 DOI: 10.1080/08927014.2022.2064747] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2021] [Revised: 04/05/2022] [Accepted: 04/06/2022] [Indexed: 06/14/2023]
Abstract
Pseudomonas aeruginosa is an opportunistic pathogen in immunocompromised patients and accounts for mortality worldwide. Quorum sensing (QS) and QS mediated biofilm formation of P. aeruginosa increase the severity of infection in the host. New and effective therapeutics are in high demand to eliminate Pseudomonas infections. The current study investigated the quorum quenching and biofilm inhibition properties of alantolactone (ATL) against P. aeruginosa PAO1. The production of key virulence factors and biofilm components were affected in bacteria when treated with sub-MIC of ATL and further validated by qRT-PCR studies. The anti-infective potential of ATL was corroborated in an in vivo model with improved survival of infected Caenorhabditis elegans and reduced bacterial colonization. In silico studies suggested the molecular interactions of ATL to QS proteins as stable. Finally, ATL was explored in the present study to inhibit QS pathways and holds the potential to develop into an effective anti-infective agent against P. aeruginosa.
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Affiliation(s)
- V T Anju
- Department of Biochemistry and Molecular Biology, School of Life Sciences, Pondicherry University, Puducherry, India
| | - Siddhardha Busi
- Department of Microbiology, School of Life Sciences, Pondicherry University, Puducherry, India
| | - Sandeep Kumar
- Department of Biochemistry and Molecular Biology, School of Life Sciences, Pondicherry University, Puducherry, India
| | - Kitlangki Suchiang
- Department of Biochemistry and Molecular Biology, School of Life Sciences, Pondicherry University, Puducherry, India
| | - Ranjith Kumavath
- Department of Genomic Science, School of Biological Sciences, Central University of Kerala, Kasaragod, Kerala, India
| | - Sampathkumar Ranganathan
- Department of Bioinformatics, School of Life Sciences, Pondicherry University, Puducherry, India
| | - Dinakara Rao Ampasala
- Department of Bioinformatics, School of Life Sciences, Pondicherry University, Puducherry, India
| | - Madhu Dyavaiah
- Department of Biochemistry and Molecular Biology, School of Life Sciences, Pondicherry University, Puducherry, India
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8
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Jangra V, Sharma N, Chhillar AK. Therapeutic approaches for combating Pseudomonas aeruginosa Infections. Microbes Infect 2022; 24:104950. [DOI: 10.1016/j.micinf.2022.104950] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2021] [Revised: 01/28/2022] [Accepted: 01/29/2022] [Indexed: 12/31/2022]
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9
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Bergamini G, Perico ME, Di Palma S, Sabatini D, Andreetta F, Defazio R, Felici A, Ferrari L. Mouse pneumonia model by Acinetobacter baumannii multidrug resistant strains: Comparison between intranasal inoculation, intratracheal instillation and oropharyngeal aspiration techniques. PLoS One 2021; 16:e0260627. [PMID: 34855837 PMCID: PMC8638993 DOI: 10.1371/journal.pone.0260627] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2021] [Accepted: 11/12/2021] [Indexed: 11/18/2022] Open
Abstract
Infectious pneumonia induced by multidrug resistant (MDR) Acinetobacter baumannii strains is among the most common and deadly forms of healthcare acquired infections. Over the years, different strategies have been put in place to increase host susceptibility to MDR A. baumannii, since only a self-limiting pneumonia with no or limited local bacterial replication was frequently obtained in mouse models. Direct instillation into the trachea or intranasal inoculation of the bacterial suspension are the techniques used to induce the infection in most of the preclinical models of pneumonia developed to date. More recently, the oropharyngeal aspiration procedure has been widely described in the literature for a variety of purposes including pathogens administration. Aim of this study was to compare the oropharyngeal aspiration technique to the intranasal inoculation and intratracheal instillation in the ability of inducing a consistent lung infection with two MDR A. baumannii clinical isolates in immunocompromised mice. Moreover, pneumonia obtained by bacteria administration with two out of three techniques, intratracheal and oropharyngeal, was characterised in terms of histopathology of pulmonary lesions, biomarkers of inflammation level and leukocytes cells infiltration extent after mice treatment with either vehicle or the antibiotic tigecycline. The data generated clearly showed that both strains were not able to colonize the lungs when inoculated by intranasal route. By contrast, the bacterial load in lungs of mice intratracheally or oropharyngeally infected significantly increased during 26 hours of monitoring, thus highlighting the ability of these strains to generate the infection when directly instilled into the lower respiratory airways. Furthermore, the intragroup variability of mice was significantly reduced with respect to those intranasally administered. Tigecycline was efficacious in lung bacterial load and cytokines release reduction. Findings were supported by semi-quantitative histopathological evaluation of the pulmonary lesions and by inflammatory biomarkers analysis. To conclude, both intratracheal instillation and oropharyngeal aspiration techniques showed to be suitable methods for inducing a robust and consistent pneumonia infection in mice when difficult MDR A. baumannii clinical isolates were used. Noteworthy, oropharyngeal aspiration not requiring specific technical skills and dedicated equipment, was proven to be a safer, easier and faster technique in comparison to the intratracheal instillation.
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Affiliation(s)
- Gabriella Bergamini
- Translational Microbiology, Antibacterial Discovery, Aptuit (Verona) S.r.l., an Evotec Company DD&D Research Centre, Verona, Italy
- * E-mail:
| | - Maria Elisa Perico
- In vitro Pharmacology, Aptuit (Verona) S.r.l., an Evotec Company DD&D Research Centre, Verona, Italy
| | - Stefano Di Palma
- Pathology, Preclinical Development, Aptuit (Verona) S.r.l., an Evotec Company, DD&D Research Centre, Verona, Italy
| | - Daniela Sabatini
- In vitro Pharmacology, Microbiology Discovery, Aptuit (Verona) S.r.l., an Evotec Company, DD&D Research Centre, Verona, Italy
| | - Filippo Andreetta
- In vitro Pharmacology, Aptuit (Verona) S.r.l., an Evotec Company DD&D Research Centre, Verona, Italy
| | - Rossella Defazio
- Pathology, Preclinical Development, Aptuit (Verona) S.r.l., an Evotec Company, DD&D Research Centre, Verona, Italy
| | - Antonio Felici
- In vitro Pharmacology, Microbiology Discovery, Aptuit (Verona) S.r.l., an Evotec Company, DD&D Research Centre, Verona, Italy
| | - Livia Ferrari
- Translational Microbiology, Antibacterial Discovery, Aptuit (Verona) S.r.l., an Evotec Company DD&D Research Centre, Verona, Italy
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10
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Elshaer SL, Shaaban MI. Inhibition of Quorum Sensing and Virulence Factors of Pseudomonas aeruginosa by Biologically Synthesized Gold and Selenium Nanoparticles. Antibiotics (Basel) 2021; 10:1461. [PMID: 34943673 PMCID: PMC8698379 DOI: 10.3390/antibiotics10121461] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2021] [Revised: 11/21/2021] [Accepted: 11/24/2021] [Indexed: 12/05/2022] Open
Abstract
The development of microbial resistance requires a novel approach to control microbial infection. This study implies the microbial synthesis of nanometals and assessment of their antivirulent activity against Pseudomonas aeruginosa. Streptomyces isolate S91 was isolated from soil with substantial ability for growth at high salts concentrations. The cell-free supernatant of S91was utilized for the synthesis of Au-NPs and Se-NPs. The 16S rRNA sequence analysis of Streptomyces S91 revealed that S91 had a high similarity (98.82%) to Streptomyces olivaceous. The biosynthesized Au-NPs and Se-NPs were characterized using a UV-Vis spectrophotometer, dynamic light scattering, transmission electron microscopy, energy dispersive X-ray diffraction and Fourier-transform infrared spectroscopy. The quorum sensing inhibitory (QSI) potential of Au-NPs and Se-NPs and the antivirulence activity was examined against P. aeruginosa. The QSI potential was confirmed using RT-PCR. The synthesized Au-NPs and Se-NPs were monodispersed spherical shapes with particle size of 12.2 and 67.98 nm, respectively. Au-NPs and Se-NPs eliminated QS in P. aeruginosa at a concentration range of 2.3-18.5 µg/mL for Au-NPs and 2.3-592 µg/mL for Se-NPs. In addition, Au-NPs and Se-NPs significantly inhibited QS-related virulence factors, such as pyocyanin, protease and, elastase in P. aeruginosa. At the molecular level, Au-NPs and Se-NPs significantly suppressed the relative expression of QS genes and toxins. Hence, the biosynthesized Au-NPS and Se-NPS could be substantial inhibitors of QS and virulence traits of P. aeruginosa.
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Affiliation(s)
| | - Mona I. Shaaban
- Department of Microbiology and Immunology, Faculty of Pharmacy, Mansoura University, Mansoura 35516, Egypt;
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11
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Enos A, Kumar P, Lassiter B, Sampson A, Hair P, Krishna N, Cunnion K. Peptide inhibition of neutrophil-mediated injury after in vivo challenge with supernatant of Pseudomonas aeruginosa and immune-complexes. PLoS One 2021; 16:e0254353. [PMID: 34242348 PMCID: PMC8270186 DOI: 10.1371/journal.pone.0254353] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2020] [Accepted: 06/24/2021] [Indexed: 11/18/2022] Open
Abstract
Neutrophils are recognized for their role in host defense against pathogens as well as inflammatory conditions mediated through many mechanisms including neutrophil extracellular trap (NET) formation and generation of reactive oxygen species (ROS). NETs are increasingly appreciated as a major contributor in autoimmune and inflammatory diseases such as cystic fibrosis. Myeloperoxidase (MPO), a key neutrophil granule enzyme mediates generation of hypochlorous acid which, when extracellular, can cause host tissue damage. To better understand the role played by neutrophils in inflammatory diseases, we measured and modulated myeloperoxidase activity and NETs in vivo, utilizing a rat peritonitis model. RLS-0071 is a 15 amino acid peptide that has been shown to inhibit myeloperoxidase activity and NET formation in vitro. The rat model of inflammatory peritonitis was induced with intraperitoneal injection of either P. aeruginosa supernatant or immune-complexes. After euthanasia, a peritoneal wash was performed and measured for myeloperoxidase activity and free DNA as a surrogate for measurement of NETs. P. aeruginosa supernatant caused a 2-fold increase in MPO activity and free DNA when injected IP. Immune-complexes injected IP increased myeloperoxidase activity and free DNA 2- fold. RLS-0071 injection decreased myeloperoxidase activity and NETs in the peritoneal fluid generally to baseline levels in the presence of P. aeruginosa supernatant or immune-complexes. Taken together, RLS-0071 demonstrated the ability to inhibit myeloperoxidase activity and NET formation in vivo when initiated by different inflammatory stimuli including shed or secreted bacterial constituents as well as immune-complexes.
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Affiliation(s)
- Adrianne Enos
- ReAlta Life Sciences Inc, Norfolk, Virginia, United States of America
| | - Parvathi Kumar
- ReAlta Life Sciences Inc, Norfolk, Virginia, United States of America
- Children’s Hospital of The King’s Daughters, Norfolk, Virginia, United States of America
| | - Brittany Lassiter
- ReAlta Life Sciences Inc, Norfolk, Virginia, United States of America
| | - Alana Sampson
- ReAlta Life Sciences Inc, Norfolk, Virginia, United States of America
| | - Pamela Hair
- ReAlta Life Sciences Inc, Norfolk, Virginia, United States of America
| | - Neel Krishna
- ReAlta Life Sciences Inc, Norfolk, Virginia, United States of America
- Department of Microbiology and Molecular Cell Biology, Eastern Virginia Medical School, Norfolk, Virginia, United States of America
- Department of Pediatrics, Eastern Virginia Medical School, Norfolk, Virginia, United States of America
| | - Kenji Cunnion
- ReAlta Life Sciences Inc, Norfolk, Virginia, United States of America
- Children’s Hospital of The King’s Daughters, Norfolk, Virginia, United States of America
- Department of Microbiology and Molecular Cell Biology, Eastern Virginia Medical School, Norfolk, Virginia, United States of America
- Department of Pediatrics, Eastern Virginia Medical School, Norfolk, Virginia, United States of America
- Children’s Specialty Group, Norfolk, Virginia, United States of America
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12
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Oriano M, Amati F, Gramegna A, De Soyza A, Mantero M, Sibila O, Chotirmall SH, Voza A, Marchisio P, Blasi F, Aliberti S. Protease-Antiprotease Imbalance in Bronchiectasis. Int J Mol Sci 2021; 22:5996. [PMID: 34206113 PMCID: PMC8199509 DOI: 10.3390/ijms22115996] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2021] [Revised: 05/27/2021] [Accepted: 05/29/2021] [Indexed: 12/12/2022] Open
Abstract
Airway inflammation plays a central role in bronchiectasis. Protease-antiprotease balance is crucial in bronchiectasis pathophysiology and increased presence of unopposed proteases activity may contribute to bronchiectasis onset and progression. Proteases' over-reactivity and antiprotease deficiency may have a role in increasing inflammation in bronchiectasis airways and may lead to extracellular matrix degradation and tissue damage. Imbalances in serine proteases and matrix-metallo proteinases (MMPs) have been associated to bronchiectasis. Active neutrophil elastase has been associated with disease severity and poor long-term outcomes in this disease. Moreover, high levels of MMPs have been associated with radiological and disease severity. Finally, severe deficiency of α1-antitrypsin (AAT), as PiSZ and PiZZ (proteinase inhibitor SZ and ZZ) phenotype, have been associated with bronchiectasis development. Several treatments are under study to reduce protease activity in lungs. Molecules to inhibit neutrophil elastase activity have been developed in both oral or inhaled form, along with compounds inhibiting dipeptydil-peptidase 1, enzyme responsible for the activation of serine proteases. Finally, supplementation with AAT is in use for patients with severe deficiency. The identification of different targets of therapy within the protease-antiprotease balance contributes to a precision medicine approach in bronchiectasis and eventually interrupts and disrupts the vicious vortex which characterizes the disease.
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Affiliation(s)
- Martina Oriano
- Respiratory Unit and Cystic Fibrosis Adult Center, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico, 20122 Milan, Italy; (M.O.); (F.A.); (A.G.); (M.M.); (P.M.); (F.B.)
- Department of Pathophysiology and Transplantation, Università degli Studi di Milano, 20122 Milan, Italy
| | - Francesco Amati
- Respiratory Unit and Cystic Fibrosis Adult Center, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico, 20122 Milan, Italy; (M.O.); (F.A.); (A.G.); (M.M.); (P.M.); (F.B.)
| | - Andrea Gramegna
- Respiratory Unit and Cystic Fibrosis Adult Center, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico, 20122 Milan, Italy; (M.O.); (F.A.); (A.G.); (M.M.); (P.M.); (F.B.)
- Department of Pathophysiology and Transplantation, Università degli Studi di Milano, 20122 Milan, Italy
| | - Anthony De Soyza
- Population and Health Science Institute, NIHR Biomedical Research Centre for Ageing & Freeman Hospital, Newcastle University, Newcastle NE2 4HH, UK;
| | - Marco Mantero
- Respiratory Unit and Cystic Fibrosis Adult Center, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico, 20122 Milan, Italy; (M.O.); (F.A.); (A.G.); (M.M.); (P.M.); (F.B.)
- Department of Pathophysiology and Transplantation, Università degli Studi di Milano, 20122 Milan, Italy
| | - Oriol Sibila
- Respiratory Department, Hospital Clinic, IDIBAPS, CIBERES, 08036 Barcelona, Spain;
| | - Sanjay H. Chotirmall
- Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore 639798, Singapore;
| | - Antonio Voza
- Emergency Department, IRCCS Humanitas Research Teaching Hospital, 20122 Milan, Italy;
| | - Paola Marchisio
- Respiratory Unit and Cystic Fibrosis Adult Center, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico, 20122 Milan, Italy; (M.O.); (F.A.); (A.G.); (M.M.); (P.M.); (F.B.)
- Paediatric Highly Intensive Care Unit, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico, 20122 Milan, Italy
| | - Francesco Blasi
- Respiratory Unit and Cystic Fibrosis Adult Center, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico, 20122 Milan, Italy; (M.O.); (F.A.); (A.G.); (M.M.); (P.M.); (F.B.)
- Department of Pathophysiology and Transplantation, Università degli Studi di Milano, 20122 Milan, Italy
| | - Stefano Aliberti
- Respiratory Unit and Cystic Fibrosis Adult Center, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico, 20122 Milan, Italy; (M.O.); (F.A.); (A.G.); (M.M.); (P.M.); (F.B.)
- Department of Pathophysiology and Transplantation, Università degli Studi di Milano, 20122 Milan, Italy
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13
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Reales-Calderón JA, Sun Z, Mascaraque V, Pérez-Navarro E, Vialás V, Deutsch EW, Moritz RL, Gil C, Martínez JL, Molero G. A wide-ranging Pseudomonas aeruginosa PeptideAtlas build: A useful proteomic resource for a versatile pathogen. J Proteomics 2021; 239:104192. [PMID: 33757883 PMCID: PMC8668395 DOI: 10.1016/j.jprot.2021.104192] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2020] [Revised: 02/17/2021] [Accepted: 03/10/2021] [Indexed: 01/05/2023]
Abstract
Pseudomonas aeruginosa is an important opportunistic human pathogen with high prevalence in nosocomial infections. This microorganism is a good model for understanding biological processes such as the quorum-sensing response, the metabolic integration of virulence, the mechanisms of global regulation of bacterial physiology, and the evolution of antibiotic resistance. Till now, P. aeruginosa proteomic data, although available in several on-line repositories, were dispersed and difficult to access. In the present work, proteomes of the PAO1 strain grown under different conditions and from diverse cellular compartments have been joined to build the Pseudomonas PeptideAtlas. This resource is a comprehensive mass spectrometry-derived peptide and inferred protein database with 71.3% coverage of the total predicted proteome of P. aeruginosa PAO1, the highest coverage among bacterial PeptideAtlas datasets. The proteins included cover 89% of metabolic proteins, 72% of proteins involved in genetic information processing, 83% of proteins responsible for environmental information processing, more than 88% of the ones related to quorum sensing and biofilm formation, and 89% of proteins responsible for antimicrobial resistance. It exemplifies a necessary tool for targeted proteomics studies, system-wide observations, and cross-species observational studies. The manuscript describes the building of the PeptideAtlas and the contribution of the different proteomic data used. SIGNIFICANCE: Pseudomonas aeruginosa is among the most versatile human bacterial pathogens. Studies of its proteome are very important as they can reveal virulence factors and mechanisms of antibiotic resistance. The construction of a proteomic resource such as the PeptideAtlas enables targeted proteomics studies, system-wide observations, and cross-species observational studies.
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Affiliation(s)
- J A Reales-Calderón
- Departamento de Microbiología y Parasitología, Facultad de Farmacia, Universidad Complutense de Madrid, Spain
| | - Z Sun
- Institute for Systems Biology, Seattle, WA, USA
| | - V Mascaraque
- Departamento de Microbiología y Parasitología, Facultad de Farmacia, Universidad Complutense de Madrid, Spain
| | - E Pérez-Navarro
- Unidad de Proteómica de la Universidad Complutense de Madrid, Spain
| | - V Vialás
- Departamento de Microbiología y Parasitología, Facultad de Farmacia, Universidad Complutense de Madrid, Spain
| | - E W Deutsch
- Institute for Systems Biology, Seattle, WA, USA
| | - R L Moritz
- Institute for Systems Biology, Seattle, WA, USA
| | - C Gil
- Departamento de Microbiología y Parasitología, Facultad de Farmacia, Universidad Complutense de Madrid, Spain; Unidad de Proteómica de la Universidad Complutense de Madrid, Spain
| | - J L Martínez
- Departamento de Biotecnología Microbiana, Centro Nacional de Biotecnología, CSIC, Madrid, Spain
| | - G Molero
- Departamento de Microbiología y Parasitología, Facultad de Farmacia, Universidad Complutense de Madrid, Spain.
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14
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Gbian DL, Omri A. The Impact of an Efflux Pump Inhibitor on the Activity of Free and Liposomal Antibiotics against Pseudomonas aeruginosa. Pharmaceutics 2021; 13:pharmaceutics13040577. [PMID: 33919624 PMCID: PMC8072581 DOI: 10.3390/pharmaceutics13040577] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2021] [Revised: 04/14/2021] [Accepted: 04/15/2021] [Indexed: 11/21/2022] Open
Abstract
The eradication of Pseudomonas aeruginosa in cystic fibrosis patients has become continuously difficult due to its increased resistance to treatments. This study assessed the efficacy of free and liposomal gentamicin and erythromycin, combined with Phenylalanine arginine beta-naphthylamide (PABN), a broad-spectrum efflux pump inhibitor, against P. aeruginosa isolates. Liposomes were prepared and characterized for their sizes and encapsulation efficiencies. The antimicrobial activities of formulations were determined by the microbroth dilution method. Their activity on P. aeruginosa biofilms was assessed, and the effect of sub-inhibitory concentrations on bacterial virulence factors, quorum sensing (QS) signals and bacterial motility was also evaluated. The average diameters of liposomes were 562.67 ± 33.74 nm for gentamicin and 3086.35 ± 553.95 nm for erythromycin, with encapsulation efficiencies of 13.89 ± 1.54% and 51.58 ± 2.84%, respectively. Liposomes and PABN combinations potentiated antibiotics by reducing minimum inhibitory and bactericidal concentrations by 4–32 fold overall. The formulations significantly inhibited biofilm formation and differentially attenuated virulence factor production as well as motility. Unexpectedly, QS signal production was not affected by treatments. Taken together, the results indicate that PABN shows potential as an adjuvant of liposomal macrolides and aminoglycosides in the management of lung infections in cystic fibrosis patients.
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Affiliation(s)
| | - Abdelwahab Omri
- Correspondence: ; Tel.: +1-705-675-1151-2190; Fax: +1-705-675-4844
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15
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Vidaillac C, Chotirmall SH. Pseudomonas aeruginosa in bronchiectasis: infection, inflammation, and therapies. Expert Rev Respir Med 2021; 15:649-662. [PMID: 33736539 DOI: 10.1080/17476348.2021.1906225] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Introduction: Bronchiectasis is a chronic endobronchial suppurative disease characterized by irreversibly dilated bronchi damaged by repeated polymicrobial infections and predominantly, neutrophilic airway inflammation. Some consider bronchiectasis a syndromic consequence of several different causes whilst others view it as an individual disease entity. In most patients, identifying an underlying cause remains challenging. The acquisition and colonization of affected airways by Pseudomonas aeruginosa represent a critical and adverse clinical consequence for its progression and management.Areas covered: In this review, we outline clinical and pre-clinical peer-reviewed research published in the last 5 years, focusing on the pathogenesis of bronchiectasis and the role of P. aeruginosa and its virulence in shaping host inflammatory and immune responses in the airway. We further detail its role in airway infection, the lung microbiome, and address therapeutic options in bronchiectasis.Expert opinion: P. aeruginosa represents a key pulmonary pathogen in bronchiectasis that causes acute and/or chronic airway infection. Eradication can prevent adverse clinical consequence and/or disease progression. Novel therapeutic strategies are emerging and include combination-based approaches. Addressing airway infection caused by P. aeruginosa in bronchiectasis is necessary to prevent airway damage, loss of lung function and exacerbations, all of which contribute to adverse clinical outcome.
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Affiliation(s)
- Celine Vidaillac
- Oxford University Clinical Research Unit, University of Oxford, Ho Chi Minh City, Vietnam.,Center for Tropical Medicine and Global Health, University of Oxford, Oxford, UK
| | - Sanjay H Chotirmall
- Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore
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16
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Oliveira VDC, Steixner S, Nascimento CD, Pagnano VO, Silva-Lovato CH, Paranhos HDFO, Wilflingseder D, Coraça-Huber D, Watanabe E. Expression of virulence factors by Pseudomonas aeruginosa biofilm after bacteriophage infection. Microb Pathog 2021; 154:104834. [PMID: 33691179 DOI: 10.1016/j.micpath.2021.104834] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2020] [Revised: 02/16/2021] [Accepted: 02/17/2021] [Indexed: 12/19/2022]
Abstract
The use of bacteriophages for the treatment of bacterial infections has been extensively studied. Nonetheless, the stress response regarding bacteriophage infection and the expression of virulence factors of Pseudomonas aeruginosa after phage infection is poorly discussed. In this study, we evaluated biofilm formation capacity and expression of virulence factors of P. aeruginosa after bacteriophage infection. Biofilm growth rates, biofilm morphology, pyocyanin production and elastase activity were evaluated after 2, 8, 24 and 48 h of co-cultivation with bacteriophages that was recently characterized and showed to be infective towards clinical isolates. In parallel, quantitative real-time polymerase chain reactions were carried out to verify the expression of virulence-related genes. Bacteriophages promoted substantial changes in P. aeruginosa biofilm growth at early co-culture time. In addition, at 8 h, we observed that some cultures developed filaments. Although bacteriophages did not alter both pyocyanin and protease activity, changes on the expression level of genes related to virulence factors were detected. Usually, lasI, pslA, lasB and phzH genes were upregulated after 2 and 48 h of co-culture. These results highlight the need for extensive investigation of pathways and molecules involved in phage infection, since the transcriptional changes would suggest a response activation by P. aeruginosa.
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Affiliation(s)
- Viviane de Cássia Oliveira
- Human Exposome and Infectious Diseases Network - HEID, School of Nursing of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil; Department of Dental Materials and Prostheses, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo, Brazil
| | - Stephan Steixner
- Research Laboratory for Biofilms and Implant Associated Infections (BIOFILM LAB), Department of Orthopedic Surgery, Experimental Orthopedics, Medical University of Innsbruck, Innsbruck, Austria
| | - Cássio do Nascimento
- Department of Dental Materials and Prostheses, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo, Brazil
| | - Valéria Oliveira Pagnano
- Department of Dental Materials and Prostheses, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo, Brazil
| | - Cláudia Helena Silva-Lovato
- Department of Dental Materials and Prostheses, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo, Brazil
| | - Helena de Freitas Oliveira Paranhos
- Department of Dental Materials and Prostheses, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo, Brazil
| | - Doris Wilflingseder
- Division of Hygiene and Medical Microbiology, Medical University of Innsbruck, Innsbruck, Austria
| | - Débora Coraça-Huber
- Research Laboratory for Biofilms and Implant Associated Infections (BIOFILM LAB), Department of Orthopedic Surgery, Experimental Orthopedics, Medical University of Innsbruck, Innsbruck, Austria
| | - Evandro Watanabe
- Human Exposome and Infectious Diseases Network - HEID, School of Nursing of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil; Department of Restorative Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo, São Paulo, Brazil.
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17
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Sandri A, Lleo MM, Signoretto C, Boaretti M, Boschi F. Protease inhibitors elicit anti-inflammatory effects in CF mice with Pseudomonas aeruginosa acute lung infection. Clin Exp Immunol 2020; 203:87-95. [PMID: 32946591 DOI: 10.1111/cei.13518] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2020] [Revised: 08/03/2020] [Accepted: 09/09/2020] [Indexed: 01/30/2023] Open
Abstract
Pseudomonas aeruginosa is the major respiratory pathogen in patients with cystic fibrosis (CF). P. aeruginosa-secreted proteases, in addition to host proteases, degrade lung tissue and interfere with immune processes. In this study, we aimed at evaluating the possible anti-inflammatory effects of protease inhibitors Marimastat and Ilomastat in the treatment of P. aeruginosa infection. Lung infection with the P. aeruginosa PAO1 strain was established in wild-type and cystic fibrosis transmembrane conductance regulator (CFTR) knock-out C57BL/6 mice expressing a luciferase gene under control of bovine interleukin (IL)-8 promoter. After intratracheal instillation with 150 µM Marimastat and Ilomastat, lung inflammation was monitored by in-vivo bioluminescence imaging and bacterial load in the lungs was assessed. In vitro, the effects of protease inhibitors on PAO1 growth and viability were evaluated. Acute lung infection was established in both wild-type and CFTR knock-out mice. After 24 h, the infection induced IL-8-dependent bioluminescence emission, indicating lung inflammation. In infected mice with ongoing inflammation, intratracheal treatment with 150 µM Marimastat and Ilomastat reduced the bioluminescence signal in comparison to untreated, infected animals. Bacterial load in the lungs was not affected by the treatment, and in vitro the same dose of Marimastat and Ilomastat did not affect PAO1 growth and viability, confirming that these molecules have no additional anti-bacterial activity. Our results show that inhibition of protease activity elicits anti-inflammatory effects in cystic fibrosis (CF) mice with acute P. aeruginosa lung infection. Thus, Marimastat and Ilomastat represent candidate molecules for the treatment of CF patients, encouraging further studies on protease inhibitors and their application in inflammatory diseases.
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Affiliation(s)
- A Sandri
- Department of Diagnostics and Public Health, Section of Microbiology, University of Verona, Verona, Italy
| | - M M Lleo
- Department of Diagnostics and Public Health, Section of Microbiology, University of Verona, Verona, Italy
| | - C Signoretto
- Department of Diagnostics and Public Health, Section of Microbiology, University of Verona, Verona, Italy
| | - M Boaretti
- Department of Diagnostics and Public Health, Section of Microbiology, University of Verona, Verona, Italy
| | - F Boschi
- Department of Computer Science, University of Verona, Verona, Italy
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18
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Nizami B, Tan W, Arias-Moreno X. In silico identification of novel PrfA inhibitors to fight listeriosis: A virtual screening and molecular dynamics studies. J Mol Graph Model 2020; 101:107728. [PMID: 32942202 DOI: 10.1016/j.jmgm.2020.107728] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2020] [Revised: 08/19/2020] [Accepted: 08/21/2020] [Indexed: 10/23/2022]
Abstract
Listeria monocytogenes is considered to be one of the most dangerous foodborne pathogens as it can cause listeriosis, a life-threatening human disease. While the incidence of listeriosis is very low its fatality rate is exceptionally high. Because many multi-resistance Listeria monocytogenes strains that do not respond to conventional antibiotic therapy have been recently described, development of new antimicrobials to fight listeriosis is necessary. The positive regulatory factor A (PrfA) is a key homodimeric transcription factor that modulates the transcription of multiple virulence factors which are ultimately responsible of Listeria monocytogenes' pathogenicity. In the present manuscript we describe several new potential PrfA inhibitors that were identified after performing ligand-based virtual screening followed by molecular docking calculations against the wild-type PrfA structure. The three top-scored drug-likeness inhibitors bound to the wild-type PrfA structure were further assessed by Molecular Dynamics (MD) simulations. Besides, the three top-scored inhibitors were docked into a constitutive active apoPrfA mutant structure and the corresponding complexes were also simulated by MD. According to the obtained data, PUBChem 87534955 (P875) and PUBChem 58473762 (P584) may not only bind and inhibit wild-type PrfA but the aforementioned apoPrfA mutant as well. Therefore, P875 and P584 might represent good starting points for the development of a completely new set of antimicrobial agents to treat listeriosis.
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Affiliation(s)
- Bilal Nizami
- Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, H-1117, Budapest, Magyar Tudósok krt. 2, Hungary
| | - Wen Tan
- Institute of Biomedical and Pharmaceutical Sciences, Guangdong University of Technology, Guangzhou, 510006, China.
| | - Xabier Arias-Moreno
- Institute of Biomedical and Pharmaceutical Sciences, Guangdong University of Technology, Guangzhou, 510006, China.
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19
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Sauvage S, Hardouin J. Exoproteomics for Better Understanding Pseudomonas aeruginosa Virulence. Toxins (Basel) 2020; 12:E571. [PMID: 32899849 PMCID: PMC7551764 DOI: 10.3390/toxins12090571] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2020] [Revised: 08/25/2020] [Accepted: 09/01/2020] [Indexed: 12/12/2022] Open
Abstract
Pseudomonas aeruginosa is the most common human opportunistic pathogen associated with nosocomial diseases. In 2017, the World Health Organization has classified P. aeruginosa as a critical agent threatening human health, and for which the development of new treatments is urgently necessary. One interesting avenue is to target virulence factors to understand P. aeruginosa pathogenicity. Thus, characterising exoproteins of P. aeruginosa is a hot research topic and proteomics is a powerful approach that provides important information to gain insights on bacterial virulence. The aim of this review is to focus on the contribution of proteomics to the studies of P. aeruginosa exoproteins, highlighting its relevance in the discovery of virulence factors, post-translational modifications on exoproteins and host-pathogen relationships.
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Affiliation(s)
- Salomé Sauvage
- Polymers, Biopolymers, Surface Laboratory, UMR 6270 CNRS, University of Rouen, CEDEX, F-76821 Mont-Saint-Aignan, France;
- PISSARO Proteomics Facility, IRIB, F-76820 Mont-Saint-Aignan, France
| | - Julie Hardouin
- Polymers, Biopolymers, Surface Laboratory, UMR 6270 CNRS, University of Rouen, CEDEX, F-76821 Mont-Saint-Aignan, France;
- PISSARO Proteomics Facility, IRIB, F-76820 Mont-Saint-Aignan, France
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20
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Pehote G, Vij N. Autophagy Augmentation to Alleviate Immune Response Dysfunction, and Resolve Respiratory and COVID-19 Exacerbations. Cells 2020; 9:cells9091952. [PMID: 32847034 PMCID: PMC7565665 DOI: 10.3390/cells9091952] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2020] [Revised: 08/18/2020] [Accepted: 08/21/2020] [Indexed: 12/18/2022] Open
Abstract
The preservation of cellular homeostasis requires the synthesis of new proteins (proteostasis) and organelles, and the effective removal of misfolded or impaired proteins and cellular debris. This cellular homeostasis involves two key proteostasis mechanisms, the ubiquitin proteasome system and the autophagy–lysosome pathway. These catabolic pathways have been known to be involved in respiratory exacerbations and the pathogenesis of various lung diseases, such as chronic obstructive pulmonary disease (COPD), cystic fibrosis (CF), idiopathic pulmonary fibrosis (IPF), acute lung injury (ALI), acute respiratory distress syndrome (ARDS), and coronavirus disease-2019 (COVID-19). Briefly, proteostasis and autophagy processes are known to decline over time with age, cigarette or biomass smoke exposure, and/or influenced by underlying genetic factors, resulting in the accumulation of misfolded proteins and cellular debris, elevating apoptosis and cellular senescence, and initiating the pathogenesis of acute or chronic lung disease. Moreover, autophagic dysfunction results in an impaired microbial clearance, post-bacterial and/or viral infection(s) which contribute to the initiation of acute and recurrent respiratory exacerbations as well as the progression of chronic obstructive and restrictive lung diseases. In addition, the autophagic dysfunction-mediated cystic fibrosis transmembrane conductance regulator (CFTR) immune response impairment further exacerbates the lung disease. Recent studies demonstrate the therapeutic potential of novel autophagy augmentation strategies, in alleviating the pathogenesis of chronic obstructive or restrictive lung diseases and exacerbations such as those commonly seen in COPD, CF, ALI/ARDS and COVID-19.
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Affiliation(s)
- Garrett Pehote
- Michigan State University College of Osteopathic Medicine, East Lansing, MI 48823, USA;
| | - Neeraj Vij
- Department of Pediatrics and Pulmonary Medicine, the Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA
- PRECISION THERANOSTICS INC, Baltimore, MD 21202, USA
- VIJ BIOTECH, Baltimore, MD 21202, USA
- Correspondence: or ; Tel.: +1-240-623-0757
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21
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A novel scaffold to fight Pseudomonas aeruginosa pyocyanin production: early steps to novel antivirulence drugs. Future Med Chem 2020; 12:1489-1503. [PMID: 32772556 DOI: 10.4155/fmc-2019-0351] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Aim: Although bacterial resistance is a growing concern worldwide, the development of antibacterial drugs has been steadily decreasing. One alternative to fight this issue relies on reducing the bacteria virulence without killing it. PhzS plays a pivotal role in pyocyanin production in Pseudomonas aeruginosa. Results: A total of 31 thiazolidinedione derivatives were evaluated as putative PhzS inhibitors, using thermo shift assays. Compounds that significantly shifted PhzS's Tm had their mode of inhibition (cofactor competitor) and affinity calculated by thermo shift assays as well. The most promising compound (E)-5-(4-((4-oxo-3-phenyl-3,4-dihydroquinazolin-2-yl)methoxy)benzylidene)thiazolidine-2,4-dione had their affinity confirmed by microscale thermophoresis (Kd = 18 μM). Cellular assays suggest this compound reduces pyocyanin production in vitro, but does not affect P. aeruginosa viability. Conclusion: The first inhibitor of PhzS is described.
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22
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da Silva RTP, Petri MV, Valencia EY, Camargo PHC, de Torresi SIC, Spira B. Visible light plasmon excitation of silver nanoparticles against antibiotic-resistant Pseudomonas aeruginosa. Photodiagnosis Photodyn Ther 2020; 31:101908. [PMID: 32634655 DOI: 10.1016/j.pdpdt.2020.101908] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Revised: 06/11/2020] [Accepted: 06/26/2020] [Indexed: 12/22/2022]
Abstract
The interaction of metallic nanoparticles with light excites a local surface plasmon resonance (LSPR). This phenomenon enables the transfer of hot electrons to substrates that release Reactive Oxygen Species (ROS). In this context, the present study aimed at enhancing the antibacterial effect of citrate-covered silver nanoparticles (AgNPs) by LSPR excitation with visible LED. AgNPs possess excellent antimicrobial properties against Pseudomonas aeruginosa, one of the most refractory organisms to antibiotic treatment. The Minimum Inhibitory Concentration (MIC) of the AgNPs was 10 μg/ml under dark conditions and 5 μg/ml under light conditions. The combination of light and AgNPs led to 100% cell death after 60 min. Flow cytometry quantification showed that bacteria treated with LSPR-stimulated AgNPs displayed 4.8 times more ROS. This significant increase in ROS possibly accounts for most of the antimicrobial effect of the AgNPs. In addition, light exposition caused a small release of silver ions (0.4%) suggesting that silver ions may play a secondary role in P. aeruginosa death. Overall, the results presented here show that LSPR stimulation of AgNPs by visible light enhances the antimicrobial activity of silver nanoparticles and can be an alternative for the treatment of topic infections caused by antibiotic-resistant bacteria such as P. aeruginosa.
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Affiliation(s)
- Rafael T P da Silva
- Department of Fundamental Chemistry, Institute of Chemistry, University of São Paulo, Brazil
| | - Marcos V Petri
- Department of Fundamental Chemistry, Institute of Chemistry, University of São Paulo, Brazil
| | - Estela Y Valencia
- Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, Brazil
| | - Pedro H C Camargo
- Department of Fundamental Chemistry, Institute of Chemistry, University of São Paulo, Brazil
| | - Susana I C de Torresi
- Department of Fundamental Chemistry, Institute of Chemistry, University of São Paulo, Brazil
| | - Beny Spira
- Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, Brazil.
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23
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Zeng B, Wang C, Zhang P, Guo Z, Chen L, Duan K. Heat Shock Protein DnaJ in Pseudomonas aeruginosa Affects Biofilm Formation via Pyocyanin Production. Microorganisms 2020; 8:microorganisms8030395. [PMID: 32178243 PMCID: PMC7143733 DOI: 10.3390/microorganisms8030395] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2020] [Revised: 03/09/2020] [Accepted: 03/10/2020] [Indexed: 12/12/2022] Open
Abstract
Heat shock proteins (HSPs) play important biological roles, and they are implicated in bacterial response to environmental stresses and in pathogenesis of infection. The role of HSPs in P. aeruginosa, however, remains to be fully elucidated. Here, we report the unique role of HSP DnaJ in biofilm formation and pathogenicity in P. aeruginosa. A dnaJ mutant produced hardly any pyocyanin and formed significantly less biofilms, which contributed to decreased pathogenicity as demonstrated by reduced mortality rate in a Drosophila melanogaster infection model. The reduced pyocyanin production in the dnaJ mutant was a result of the decreased transcription of phenazine synthesis operons including phzA1, phzA2, phzS, and phzM. The reduction of biofilm formation and initial adhesion in the dnaJ mutant could be reversed by exogenously added pyocyanin or extracellular DNA (eDNA). Consistent with such observations, absence of dnaJ significantly reduced the release of eDNA in P. aeruginosa and addition of exogenous pyocyanin could restore eDNA release. These results indicate dnaJ mutation caused reduced pyocyanin production, which in turn caused the decreased eDNA, resulting in decreased biofilm formation. DnaJ is required for pyocyanin production and full virulence in P. aeruginosa; it affects biofilm formation and initial adhesion via pyocyanin, inducing eDNA release.
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Affiliation(s)
- Bo Zeng
- Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education, Northwest University, Xi‘an, Shaanxi 710069, China; (B.Z.); (C.W.); (P.Z.); (Z.G.)
| | - Chong Wang
- Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education, Northwest University, Xi‘an, Shaanxi 710069, China; (B.Z.); (C.W.); (P.Z.); (Z.G.)
| | - Pansong Zhang
- Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education, Northwest University, Xi‘an, Shaanxi 710069, China; (B.Z.); (C.W.); (P.Z.); (Z.G.)
| | - Zisheng Guo
- Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education, Northwest University, Xi‘an, Shaanxi 710069, China; (B.Z.); (C.W.); (P.Z.); (Z.G.)
| | - Lin Chen
- Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education, Northwest University, Xi‘an, Shaanxi 710069, China; (B.Z.); (C.W.); (P.Z.); (Z.G.)
- Correspondence: (L.C.); (K.D.)
| | - Kangmin Duan
- Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education, Northwest University, Xi‘an, Shaanxi 710069, China; (B.Z.); (C.W.); (P.Z.); (Z.G.)
- Department of Oral Biology & Medical Microbiology & Infectious Diseases, Rady Faculty of Health Sciences, University of Manitoba, 780 Bannatyne Ave., Winnipeg, MB R3E 0W2, Canada
- Correspondence: (L.C.); (K.D.)
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24
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Villeret B, Solhonne B, Straube M, Lemaire F, Cazes A, Garcia-Verdugo I, Sallenave JM. Influenza A Virus Pre-Infection Exacerbates Pseudomonas aeruginosa-Mediated Lung Damage Through Increased MMP-9 Expression, Decreased Elafin Production and Tissue Resilience. Front Immunol 2020; 11:117. [PMID: 32117268 PMCID: PMC7031978 DOI: 10.3389/fimmu.2020.00117] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2019] [Accepted: 01/16/2020] [Indexed: 12/13/2022] Open
Abstract
Individuals with impaired immune responses, such as ventilated and cystic fibrosis patients are often infected with Pseudomonas aeruginosa (P.a) bacteria, and a co-infection with the Influenza virus (IAV) is often present. It has been known for many years that infection with IAV predisposes the host to secondary bacterial infections (such as Streptococcus pneumoniae or Staphylococcus aureus), and there is an abundance of mechanistic studies, including those studying the role of desensitization of TLR signaling, type I IFN- mediated impairment of neutrophil chemokines and antimicrobial production, attenuation of IL1β production etc., showing this. However, little is known about the mechanistic events underlying the potential deleterious synergy between Influenza and P.a co-infections. We demonstrate here in vitro in epithelial cells and in vivo in three independent models (two involving mice given IAV +/– P.a, and one involving mice given IAV +/– IL-1β) that IAV promotes secondary P.a-mediated lung disease or augmented IL-1β-mediated inflammation. We show that IAV-P.a-mediated deleterious responses includes increased matrix metalloprotease (MMP) activity, and MMP-9 in particular, and that the use of the MMP inhibitor improves lung resilience. Furthermore, we show that IAV post-transcriptionally inhibits the antimicrobial/anti-protease molecule elafin/trappin-2, which we have shown previously to be anti-inflammatory and to protect the host against maladaptive neutrophilic inflammation in P.a infections. Our work highlights the capacity of IAV to promote further P.a-mediated lung damage, not necessarily through its interference with host resistance to the bacterium, but by down-regulating tissue resilience to lung inflammation instead. Our study therefore suggests that restoring tissue resilience in clinical settings where IAV/P.a co-exists could prove a fruitful strategy.
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Affiliation(s)
- Berengère Villeret
- Inserm, UMR1152, Laboratoire d'Excellence Inflamex, Département Hospitalo-Universtaire FIRE (Fibrosis, Inflammation and Remodeling), Université de Paris, Paris, France
| | - Brigitte Solhonne
- Inserm, UMR1152, Laboratoire d'Excellence Inflamex, Département Hospitalo-Universtaire FIRE (Fibrosis, Inflammation and Remodeling), Université de Paris, Paris, France
| | - Marjolène Straube
- Inserm, UMR1152, Laboratoire d'Excellence Inflamex, Département Hospitalo-Universtaire FIRE (Fibrosis, Inflammation and Remodeling), Université de Paris, Paris, France
| | - Flora Lemaire
- Inserm, UMR1152, Laboratoire d'Excellence Inflamex, Département Hospitalo-Universtaire FIRE (Fibrosis, Inflammation and Remodeling), Université de Paris, Paris, France
| | - Aurélie Cazes
- Inserm, UMR1152, Laboratoire d'Excellence Inflamex, Département Hospitalo-Universtaire FIRE (Fibrosis, Inflammation and Remodeling), Université de Paris, Paris, France.,Assistance Publique-Hôpitaux de Paris (APHP), Hôpital Bichat, Service de Pneumologie A, Paris, France
| | - Ignacio Garcia-Verdugo
- Inserm, UMR1152, Laboratoire d'Excellence Inflamex, Département Hospitalo-Universtaire FIRE (Fibrosis, Inflammation and Remodeling), Université de Paris, Paris, France
| | - Jean-Michel Sallenave
- Inserm, UMR1152, Laboratoire d'Excellence Inflamex, Département Hospitalo-Universtaire FIRE (Fibrosis, Inflammation and Remodeling), Université de Paris, Paris, France
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25
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Hypermutation as an Evolutionary Mechanism for Achromobacter xylosoxidans in Cystic Fibrosis Lung Infection. Pathogens 2020; 9:pathogens9020072. [PMID: 31973169 PMCID: PMC7168687 DOI: 10.3390/pathogens9020072] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2019] [Revised: 01/15/2020] [Accepted: 01/16/2020] [Indexed: 12/18/2022] Open
Abstract
Achromobacter xylosoxidans can cause chronic infections in the lungs of patients with cystic fibrosis (CF) by adapting to the specific environment. The study of longitudinal isolates allows to investigate its within-host evolution to unravel the adaptive mechanisms contributing to successful colonization. In this study, four clinical isolates longitudinally collected from two chronically infected patients underwent whole genome sequencing, de novo assembly and sequence analysis. Phenotypic assays were also performed. The isolates coming from one of the patients (patient A) presented a greater number of genetic variants, diverse integrative and conjugative elements, and different protease secretion. In the first of these isolates (strain A1), we also found a large deletion in the mutS gene, involved in DNA mismatch repair (MMR). In contrast, isolates from patient B showed a lower number of variants, only one integrative and mobilizable element, no phenotypic changes, and no mutations in the MMR system. These results suggest that in the two patients the establishment of a chronic infection was mediated by different adaptive mechanisms. While the strains isolated from patient B showed a longitudinal microevolution, strain A1 can be clearly classified as a hypermutator, confirming the occurrence and importance of this adaptive mechanism in A. xylosoxidans infection.
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26
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Khan F, Manivasagan P, Lee JW, Pham DTN, Oh J, Kim YM. Fucoidan-Stabilized Gold Nanoparticle-Mediated Biofilm Inhibition, Attenuation of Virulence and Motility Properties in Pseudomonas aeruginosa PAO1. Mar Drugs 2019; 17:E208. [PMID: 30987163 PMCID: PMC6520775 DOI: 10.3390/md17040208] [Citation(s) in RCA: 56] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2019] [Revised: 03/27/2019] [Accepted: 03/29/2019] [Indexed: 12/13/2022] Open
Abstract
The emergence of antibiotic resistance in Pseudomonas aeruginosa due to biofilm formation has transformed this opportunistic pathogen into a life-threatening one. Biosynthesized nanoparticles are increasingly being recognized as an effective anti-biofilm strategy to counter P. aeruginosa biofilms. In the present study, gold nanoparticles (AuNPs) were biologically synthesized and stabilized using fucoidan, which is an active compound sourced from brown seaweed. Biosynthesized fucoidan-stabilized AuNPs (F-AuNPs) were subjected to characterization using UV-visible spectroscopy, Fourier transform infrared spectroscopy (FTIR), field emission transmission electron microscopy (FE-TEM), dynamic light scattering (DLS), and energy dispersive X-ray diffraction (EDX). The biosynthesized F-AuNPs were then evaluated for their inhibitory effects on P. aeruginosa bacterial growth, biofilm formation, virulence factor production, and bacterial motility. Overall, the activities of F-AuNPs towards P. aeruginosa were varied depending on their concentration. At minimum inhibitory concentration (MIC) (512 µg/mL) and at concentrations above MIC, F-AuNPs exerted antibacterial activity. In contrast, the sub-inhibitory concentration (sub-MIC) levels of F-AuNPs inhibited biofilm formation without affecting bacterial growth, and eradicated matured biofilm. The minimum biofilm inhibition concentration (MBIC) and minimum biofilm eradication concentration (MBEC) were identified as 128 µg/mL. Furthermore, sub-MICs of F-AuNPs also attenuated the production of several important virulence factors and impaired bacterial swarming, swimming, and twitching motilities. Findings from the present study provide important insights into the potential of F-AuNPs as an effective new drug for controlling P. aeruginosa-biofilm-related infections.
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Affiliation(s)
- Fazlurrahman Khan
- Marine-Integrated Bionics Research Center, Pukyong National University, Busan 48513, Korea.
| | | | - Jang-Won Lee
- Department of Food Science and Technology, Pukyong National University, Busan 48513, Korea.
| | - Dung Thuy Nguyen Pham
- Department of Food Science and Technology, Pukyong National University, Busan 48513, Korea.
| | - Junghwan Oh
- Marine-Integrated Bionics Research Center, Pukyong National University, Busan 48513, Korea.
- Department of Biomedical Engineering, Pukyong National University, Busan 48513, Korea.
| | - Young-Mog Kim
- Marine-Integrated Bionics Research Center, Pukyong National University, Busan 48513, Korea.
- Department of Food Science and Technology, Pukyong National University, Busan 48513, Korea.
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