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Dai F, Zhang X, Ma G, Li W. ACOD1 mediates Staphylococcus aureus-induced inflammatory response via the TLR4/NF-κB signaling pathway. Int Immunopharmacol 2024; 140:112924. [PMID: 39133958 DOI: 10.1016/j.intimp.2024.112924] [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: 07/19/2024] [Revised: 08/07/2024] [Accepted: 08/08/2024] [Indexed: 09/01/2024]
Abstract
Staphylococcus aureus (SA) is a common Gram-positive bacterium that activates inflammatory cells, expressing various cytokines and inducing an inflammatory response. Recent research revealed aconitate decarboxylase 1 (ACOD1) as a regulator of the immune response through various metabolic pathways, playing a dual role in the inflammatory response. However, the mechanism by which ACOD1 participates in the regulation of SA-induced inflammatory responses in macrophages remains unknown. Therefore, this study aims to investigate the function and underlying regulatory mechanisms of ACOD1 in SA-induced inflammatory response. This study reveals that SA induced a macrophage inflammatory response and upregulated ACOD1 expression. ACOD1 knockdown significantly inhibited SA-induced macrophage inflammatory response, attenuated SA-induced nuclear envelope wrinkling, and plasma membrane rupture, and suppressed the TLR4/NF-κB signaling pathway. Furthermore, ACOD1 knockdown reduced the inflammatory response and alleviated lung tissue injury and cellular damage, leading to decreased bacterial loads in the lungs of SA-infected mice. Collectively, these findings demonstrate that SA induces an inflammatory response in macrophages and increases ACOD1 expression. ACOD1 enhances SA-induced inflammatory responses via the TLR4/NF-κB signaling pathway. Our findings highlight the significant role of ACOD1 in mediating the inflammatory response in SA-infected macrophages and elucidate its molecular mechanism in regulating the SA-induced inflammatory response.
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Affiliation(s)
- Fan Dai
- School of Life Sciences, Ningxia University, Yinchuan, Ningxia 750021, China; Key Lab of Ministry of Education for Protection and Utilization of Special Biological Resources in Western China, Ningxia University, Yinchuan, Ningxia 750021, China
| | - Xuyang Zhang
- School of Life Sciences, Ningxia University, Yinchuan, Ningxia 750021, China; Key Lab of Ministry of Education for Protection and Utilization of Special Biological Resources in Western China, Ningxia University, Yinchuan, Ningxia 750021, China
| | - Guilan Ma
- School of Life Sciences, Ningxia University, Yinchuan, Ningxia 750021, China; Key Lab of Ministry of Education for Protection and Utilization of Special Biological Resources in Western China, Ningxia University, Yinchuan, Ningxia 750021, China
| | - Wu Li
- School of Life Sciences, Ningxia University, Yinchuan, Ningxia 750021, China; Key Lab of Ministry of Education for Protection and Utilization of Special Biological Resources in Western China, Ningxia University, Yinchuan, Ningxia 750021, China.
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2
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Wilkinson HN, Stafford AR, Rudden M, Rocha NDC, Kidd AS, Iveson S, Bell AL, Hart J, Duarte A, Frieling J, Janssen F, Röhrig C, de Rooij B, Ekhart PF, Hardman MJ. Selective Depletion of Staphylococcus aureus Restores the Skin Microbiome and Accelerates Tissue Repair after Injury. J Invest Dermatol 2024; 144:1865-1876.e3. [PMID: 38307323 DOI: 10.1016/j.jid.2024.01.018] [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: 11/10/2023] [Revised: 01/02/2024] [Accepted: 01/16/2024] [Indexed: 02/04/2024]
Abstract
Our skin is home to a diverse community of commensal microorganisms integral to cutaneous function. However, microbial dysbiosis and barrier perturbation increase the risk of local and systemic infection. Staphylococcus aureus is a particularly problematic bacterial pathogen, with high levels of antimicrobial resistance and direct association with poor healing outcome. Innovative approaches are needed to selectively kill skin pathogens, such as S aureus, without harming the resident microbiota. In this study, we provide important data on the selectivity and efficacy of an S aureus-targeted endolysin (XZ.700) within the complex living skin/wound microbiome. Initial cross-species comparison using Nanopore long-read sequencing identified the translational potential of porcine rather than murine skin for human-relevant microbiome studies. We therefore performed an interventional study in pigs to assess the impact of endolysin administration on the microbiome. XZ.700 selectively inhibited endogenous porcine S aureus in vivo, restoring microbial diversity and promoting multiple aspects of wound repair. Subsequent mechanistic studies confirmed the importance of this microbiome modulation for effective healing in human skin. Taken together, these findings strongly support further development of S aureus-targeted endolysins for future clinical management of skin and wound infections.
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Affiliation(s)
- Holly N Wilkinson
- Biomedical Institute for Multimorbidity, Centre for Biomedicine, Hull York Medical School, The University of Hull, Hull, United Kingdom; Skin Research Centre, Hull York Medical School, The University of York, Heslington, United Kingdom.
| | - Amber R Stafford
- Biomedical Institute for Multimorbidity, Centre for Biomedicine, Hull York Medical School, The University of Hull, Hull, United Kingdom
| | - Michelle Rudden
- Biomedical Institute for Multimorbidity, Centre for Biomedicine, Hull York Medical School, The University of Hull, Hull, United Kingdom; Skin Research Centre, Hull York Medical School, The University of York, Heslington, United Kingdom
| | - Nina D C Rocha
- Biomedical Institute for Multimorbidity, Centre for Biomedicine, Hull York Medical School, The University of Hull, Hull, United Kingdom
| | - Alexandria S Kidd
- Biomedical Institute for Multimorbidity, Centre for Biomedicine, Hull York Medical School, The University of Hull, Hull, United Kingdom
| | - Sammi Iveson
- Biomedical Institute for Multimorbidity, Centre for Biomedicine, Hull York Medical School, The University of Hull, Hull, United Kingdom
| | | | | | - Ana Duarte
- Micreos Pharma B.V., Bilthoven, The Netherlands
| | | | | | | | | | | | - Matthew J Hardman
- Biomedical Institute for Multimorbidity, Centre for Biomedicine, Hull York Medical School, The University of Hull, Hull, United Kingdom; Skin Research Centre, Hull York Medical School, The University of York, Heslington, United Kingdom
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3
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Li R, Fan C, Liu G, Duan H, Qian S. Cfhr1 gene deficiency exacerbates Staphylococcus aureus-induced sepsis and acute lung injury through complement alternative pathway hyperactivation. Biochem Biophys Res Commun 2024; 737:150466. [PMID: 39128222 DOI: 10.1016/j.bbrc.2024.150466] [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: 06/11/2024] [Revised: 07/25/2024] [Accepted: 07/26/2024] [Indexed: 08/13/2024]
Abstract
OBJECTIVE To explore the role of excessive activation of the complement alternative pathway (AP) in acute lung injury (ALI) and sepsis induced by Staphylococcus aureus. Subsequently, we aimed to define the effects of Cfhr gene deletion on Factor H expression, AP activation, and the development of sepsis-induced ALI. METHODS A sepsis-induced ALI model was established in Cfhr1-knockout mice by tail vein injection of S. aureus. Sepsis scores, bacterial load in lungs, and cytokine and complement factor levels in blood and lung tissues were evaluated at 6, 12, and 24 h after model establishment. Real-time quantitative PCR and RNA sequencing (RNA-seq) were employed to assess the expression of complement pathway-associated molecules and identify differentially expressed genes (DEGs) related to immune responses. RESULTS Compared to wild-type mice, Cfhr1-knockout mice exhibited significantly increased C3a formation in lung tissues following S. aureus infection, indicating enhanced terminal complement pathway activation. Notably, these mice also had higher bacterial colony counts in the lungs, suggesting impaired S. aureus clearance. Transcriptome analysis provided further insights into the impact of Cfhr1 deletion on biological processes and signalling pathways involved in immune response regulation. CONCLUSION Cfhr1 deletion leads to excessive AP activation, exacerbating S. aureus-induced sepsis and ALI.
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Affiliation(s)
- Rubo Li
- Pediatric Intensive Care Unit, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, 100045, Beijing, China
| | - Chaonan Fan
- Pediatric Intensive Care Unit, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, 100045, Beijing, China
| | - Gang Liu
- Pediatric Intensive Care Unit, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, 100045, Beijing, China
| | - Hongnian Duan
- Baoding Hospital, Beijing Children's Hospital, Capital Medical University (Baoding Children's Hospital), China
| | - Suyun Qian
- Pediatric Intensive Care Unit, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, 100045, Beijing, China.
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4
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Hollwedel FD, Maus R, Stolper J, Iwai S, Kasai H, Holtfreter S, Pich A, Neubert L, Welte T, Yamasaki S, Maus UA. Ectopic Expression of C-Type Lectin Mincle Renders Mice Susceptible to Staphylococcal Pneumonia. J Infect Dis 2024; 230:198-208. [PMID: 39052710 DOI: 10.1093/infdis/jiad608] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2023] [Revised: 12/05/2023] [Accepted: 12/29/2023] [Indexed: 01/03/2024] Open
Abstract
Staphylococcus aureus is a prevalent pathogen in pneumonia and harbors glycolipids, which may serve as molecular patterns in Mincle (macrophage-inducible C-type lectin)-dependent pathogen recognition. We examined the role of Mincle in lung defense against S aureus in wild-type (WT), Mincle knockout (KO), and Mincle transgenic (tg) mice. Two glycolipids, glucosyl-diacylglycerol (Glc-DAG) and diglucosyl-diacylglycerol (Glc2-DAG), were purified, of which only Glc-DAG triggered Mincle reporter cell activation and professional phagocyte responses. Proteomic profiling revealed that Glc2-DAG blocked Glc-DAG-induced cytokine responses, thereby acting as inhibitor of Glc-DAG/Mincle signaling. WT mice responded to S aureus with a similar lung pathology as Mincle KO mice, most likely due to Glc2-DAG-dependent inhibition of Glc-DAG/Mincle signaling. In contrast, ectopic Mincle expression caused severe lung pathology in S aureus-infected mice, characterized by bacterial outgrowth and fatal pneumonia. Collectively, Glc2-DAG inhibits Glc-DAG/Mincle-dependent responses in WT mice, whereas sustained Mincle expression overrides Glc2-DAG-mediated inhibitory effects, conferring increased host susceptibility to S aureus.
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Affiliation(s)
- Femke D Hollwedel
- Division of Experimental Pneumology, Hannover Medical School, Hannover, Germany
| | - Regina Maus
- Division of Experimental Pneumology, Hannover Medical School, Hannover, Germany
| | - Jennifer Stolper
- Division of Experimental Pneumology, Hannover Medical School, Hannover, Germany
| | - Satoru Iwai
- Research Institute for Microbial Diseases, Osaka University, Osaka, Japan
| | - Hayato Kasai
- Research Institute for Microbial Diseases, Osaka University, Osaka, Japan
| | - Silva Holtfreter
- Institute of Immunology, University Medicine Greifswald, Greifswald, Germany
| | - Andreas Pich
- Institute of Toxicology and Core Facility Proteomics, Hannover Medical School, Hannover, Germany
| | - Lavinia Neubert
- Institute of Pathology, Hannover Medical School, Hannover, Germany
| | - Tobias Welte
- Clinic for Pneumology, Hannover Medical School, Hannover, Germany
- German Center for Lung Research, partner site BREATH, Hannover, Germany
| | - Sho Yamasaki
- Research Institute for Microbial Diseases, Osaka University, Osaka, Japan
| | - Ulrich A Maus
- Division of Experimental Pneumology, Hannover Medical School, Hannover, Germany
- German Center for Lung Research, partner site BREATH, Hannover, Germany
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5
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Wei M, Flowers L, Knight SAB, Zheng Q, Murga-Garrido S, Uberoi A, Pan JTC, Walsh J, Schroeder E, Chu EW, Campbell A, Shin D, Bradley CW, Duran-Struuck R, Grice EA. Harnessing diversity and antagonism within the pig skin microbiota to identify novel mediators of colonization resistance to methicillin-resistant Staphylococcus aureus. mSphere 2023; 8:e0017723. [PMID: 37404023 PMCID: PMC10449522 DOI: 10.1128/msphere.00177-23] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2023] [Accepted: 05/02/2023] [Indexed: 07/06/2023] Open
Abstract
The microbiota mediate multiple aspects of skin barrier function, including colonization resistance to pathogens such as Staphylococcus aureus. The endogenous skin microbiota limits S. aureus colonization via competition and direct inhibition. Novel mechanisms of colonization resistance are promising therapeutic targets for drug-resistant infections, such as those caused by methicillin-resistant S. aureus (MRSA). Here, we developed and characterized a swine model of topical microbiome perturbation and MRSA colonization. As in other model systems, topical antimicrobial treatment had a little discernable effect on community diversity though the overall microbial load was sensitive to multiple types of intervention, including swabbing. In parallel, we established a porcine skin culture collection and screened 7,700 isolates for MRSA inhibition. Using genomic and phenotypic criteria, we curated three isolates to investigate whether prophylactic colonization would inhibit MRSA colonization in vivo. The three-member consortium together, but not individually, provided protection against MRSA colonization, suggesting cooperation and/or synergy among the strains. Inhibitory isolates were represented across all major phyla of the pig skin microbiota and did not have a strong preference for inhibiting closely related species, suggesting that relatedness is not a condition of antagonism. These findings reveal the porcine skin as an underexplored reservoir of skin commensal species with the potential to prevent MRSA colonization and infection. IMPORTANCE The skin microbiota is protective against pathogens or opportunists such as S. aureus, the most common cause of skin and soft tissue infections. S. aureus can colonize normal skin and nasal passages, and colonization is a risk factor for infection, especially on breach of the skin barrier. Here, we established a pig model to study the competitive mechanisms of the skin microbiota and their role in preventing colonization by MRSA. This drug-resistant strain is also a livestock pathogen, and swine herds can be reservoirs of MRSA carriage. From 7,700 cultured skin isolates, we identified 37 unique species across three phyla that inhibited MRSA. A synthetic community of three inhibitory isolates provided protection together, but not individually, in vivo in a murine model of MRSA colonization. These findings suggest that antagonism is widespread in the pig skin microbiota, and these competitive interactions may be exploited to prevent MRSA colonization.
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Affiliation(s)
- Monica Wei
- Department of Dermatology & Microbiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Laurice Flowers
- Department of Dermatology & Microbiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Simon A. B. Knight
- Department of Dermatology & Microbiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Qi Zheng
- Department of Dermatology & Microbiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Sofia Murga-Garrido
- Department of Dermatology & Microbiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Aayushi Uberoi
- Department of Dermatology & Microbiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Jamie Ting-Chun Pan
- Department of Dermatology & Microbiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Jasmine Walsh
- Department of Dermatology & Microbiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Erin Schroeder
- Department of Dermatology & Microbiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Emily W. Chu
- Department of Dermatology & Microbiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Amy Campbell
- Department of Dermatology & Microbiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Daniel Shin
- Department of Dermatology & Microbiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Charles W. Bradley
- Department of Pathobiology, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Raimon Duran-Struuck
- Department of Pathobiology, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Elizabeth A. Grice
- Department of Dermatology & Microbiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
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6
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Hung S, Kasperkowitz A, Kurz F, Dreher L, Diessner J, Ibrahim ES, Schwarz S, Ohlsen K, Hertlein T. Next-generation humanized NSG-SGM3 mice are highly susceptible to Staphylococcus aureus infection. Front Immunol 2023; 14:1127709. [PMID: 36969151 PMCID: PMC10037040 DOI: 10.3389/fimmu.2023.1127709] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2022] [Accepted: 02/17/2023] [Indexed: 03/12/2023] Open
Abstract
Humanized hemato-lymphoid system mice, or humanized mice, emerged in recent years as a promising model to study the course of infection of human-adapted or human-specific pathogens. Though Staphylococcus aureus infects and colonizes a variety of species, it has nonetheless become one of the most successful human pathogens of our time with a wide armory of human-adapted virulence factors. Humanized mice showed increased vulnerability to S. aureus compared to wild type mice in a variety of clinically relevant disease models. Most of these studies employed humanized NSG (NOD-scid IL2Rgnull) mice which are widely used in the scientific community, but show poor human myeloid cell reconstitution. Since this immune cell compartment plays a decisive role in the defense of the human immune system against S. aureus, we asked whether next-generation humanized mice, like NSG-SGM3 (NOD-scid IL2Rgnull-3/GM/SF) with improved myeloid reconstitution, would prove to be more resistant to infection. To our surprise, we found the contrary when we infected humanized NSG-SGM3 (huSGM3) mice with S. aureus: although they had stronger human immune cell engraftment than humanized NSG mice, particularly in the myeloid compartment, they displayed even more pronounced vulnerability to S. aureus infection. HuSGM3 mice had overall higher numbers of human T cells, B cells, neutrophils and monocytes in the blood and the spleen. This was accompanied by elevated levels of pro-inflammatory human cytokines in the blood of huSGM3 mice. We further identified that the impaired survival of huSGM3 mice was not linked to higher bacterial burden nor to differences in the murine immune cell repertoire. Conversely, we could demonstrate a correlation of the rate of humanization and the severity of infection. Collectively, this study suggests a detrimental effect of the human immune system in humanized mice upon encounter with S. aureus which might help to guide future therapy approaches and analysis of virulence mechanisms.
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Affiliation(s)
- Sophia Hung
- Institute of Molecular Infection Biology, University of Würzburg, Würzburg, Germany
- Institute of Microbiology and Epizootics, Centre for Infection Medicine, School of Veterinary Medicine, Freie Universität Berlin, Berlin, Germany
- Veterinary Centre for Resistance Research (TZR), School of Veterinary Medicine, Freie Universität Berlin, Berlin, Germany
| | - Amelie Kasperkowitz
- Institute of Molecular Infection Biology, University of Würzburg, Würzburg, Germany
| | - Florian Kurz
- Institute of Pathology, University of Würzburg, Würzburg, Germany
| | - Liane Dreher
- Institute of Molecular Infection Biology, University of Würzburg, Würzburg, Germany
| | - Joachim Diessner
- Department for Obstetrics and Gynecology, University Hospital of Würzburg, Würzburg, Germany
| | - Eslam S. Ibrahim
- Institute of Molecular Infection Biology, University of Würzburg, Würzburg, Germany
- Department of Microbiology and Immunology, Faculty of Pharmacy, Cairo University, Cairo, Egypt
| | - Stefan Schwarz
- Institute of Microbiology and Epizootics, Centre for Infection Medicine, School of Veterinary Medicine, Freie Universität Berlin, Berlin, Germany
- Veterinary Centre for Resistance Research (TZR), School of Veterinary Medicine, Freie Universität Berlin, Berlin, Germany
| | - Knut Ohlsen
- Institute of Molecular Infection Biology, University of Würzburg, Würzburg, Germany
| | - Tobias Hertlein
- Institute of Molecular Infection Biology, University of Würzburg, Würzburg, Germany
- *Correspondence: Tobias Hertlein,
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7
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Kouijzer JJP, Noordermeer DJ, van Leeuwen WJ, Verkaik NJ, Lattwein KR. Native valve, prosthetic valve, and cardiac device-related infective endocarditis: A review and update on current innovative diagnostic and therapeutic strategies. Front Cell Dev Biol 2022; 10:995508. [PMID: 36263017 PMCID: PMC9574252 DOI: 10.3389/fcell.2022.995508] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2022] [Accepted: 09/06/2022] [Indexed: 11/13/2022] Open
Abstract
Infective endocarditis (IE) is a life-threatening microbial infection of native and prosthetic heart valves, endocardial surface, and/or indwelling cardiac device. Prevalence of IE is increasing and mortality has not significantly improved despite technological advances. This review provides an updated overview using recent literature on the clinical presentation, diagnosis, imaging, causative pathogens, treatment, and outcomes in native valve, prosthetic valve, and cardiac device-related IE. In addition, the experimental approaches used in IE research to improve the understanding of disease mechanisms and the current diagnostic pipelines are discussed, as well as potential innovative diagnostic and therapeutic strategies. This will ultimately help towards deriving better diagnostic tools and treatments to improve IE patient outcomes.
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Affiliation(s)
- Joop J. P. Kouijzer
- Thoraxcenter, Department of Biomedical Engineering, Erasmus MC University Medical Center, Rotterdam, Netherlands
| | - Daniëlle J. Noordermeer
- Thoraxcenter, Department of Biomedical Engineering, Erasmus MC University Medical Center, Rotterdam, Netherlands
| | - Wouter J. van Leeuwen
- Department of Cardiothoracic Surgery, Erasmus MC University Medical Center, Rotterdam, Netherlands
| | - Nelianne J. Verkaik
- Department of Medical Microbiology and Infectious Diseases, Erasmus MC University Medical Center, Rotterdam, Netherlands
| | - Kirby R. Lattwein
- Thoraxcenter, Department of Biomedical Engineering, Erasmus MC University Medical Center, Rotterdam, Netherlands
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8
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Sannat C, Hirpurkar SD, Shakya S, Dutta GK, Roy M, Jolhe DK, Singh J, Patyal A, Rawat N, Gade NE, Tripathi SM, Kalim MO. Methanolic extract of Hemidesmus indicus root augments the antibacterial and antibiofilm activity of amoxicillin and clindamycin against methicillin-resistant Staphylococcus aureus of bovine origin. Lett Appl Microbiol 2022; 75:1579-1589. [PMID: 36053759 DOI: 10.1111/lam.13825] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2022] [Revised: 08/21/2022] [Accepted: 08/25/2022] [Indexed: 11/27/2022]
Abstract
The present study evaluated the antibacterial and antibiofilm activity of MHIR in combination with amoxicillin and clindamycin against biofilm-forming MRSA isolated from milk samples of mastitic cows. Microdilution susceptibility testing and microtiter plate assays were used to evaluate the in-vitro efficacy of MHIR and antibiotic combinations against MRSA (n=12). Furthermore, in-vitro findings were validated in a murine model. Minimum inhibitory concentration and minimum biofilm inhibitory concentration of amoxicillin and clindamycin in combination with MHIR were significantly (P<0.05) lower than when used alone against MRSA. In terms of antibacterial activity, MHIR showed additive interaction (Fractional inhibitory concentrationindex >0.5-4) with amoxicillin and clindamycin against all the MRSA isolates, whereas MHIR synergizes (Fractional biofilm inhibitory concentrationindex ≤0.5) the antibiofilm activity of amoxicillin and clindamycin against 58.33% and 83.33% of the MRSA isolates, respectively. Amoxicillin/clindamycin in combination with MHIR significantly (P<0.05) reduced disease activity score, and,; bacterial load and Gram-positive spots in kidney and liver of MRSA infected mice. The combined efficacy of MHIR and amoxicillin/clindamycin was comparable to clindamycin alone but superior to amoxicillin alone. Hence, the combination of MHIR with amoxicillin/clindamycin is advocated in the treatment of MRSA-associated infections.
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Affiliation(s)
- Chandrahas Sannat
- Department of Veterinary Microbiology, College of Veterinary Science & A.H., Anjora, Dau Shri Vasudev Chandrakar Kamdhenu Vishwavidyalaya, Durg, Chhattisgarh, India
| | - S D Hirpurkar
- Department of Veterinary Microbiology, College of Veterinary Science & A.H., Anjora, Dau Shri Vasudev Chandrakar Kamdhenu Vishwavidyalaya, Durg, Chhattisgarh, India
| | - Sanjay Shakya
- Department of Veterinary Public Health, College of Veterinary Science & A.H., Anjora, Dau Shri Vasudev Chandrakar Kamdhenu Vishwavidyalaya, Durg, Chhattisgarh, India
| | - G K Dutta
- Department of Veterinary Physiology and Biochemistry, College of Veterinary Science & A.H., Anjora, Dau Shri Vasudev Chandrakar Kamdhenu Vishwavidyalaya, Durg, Chhattisgarh, India
| | - Manju Roy
- Department of Veterinary Physiology and Biochemistry, College of Veterinary Science & A.H., Anjora, Dau Shri Vasudev Chandrakar Kamdhenu Vishwavidyalaya, Durg, Chhattisgarh, India
| | - D K Jolhe
- Department of Veterinary Pathology, College of Veterinary Science & A.H., Anjora, Dau Shri Vasudev Chandrakar Kamdhenu Vishwavidyalaya, Durg, Chhattisgarh, India
| | - Jasmeet Singh
- Wild life health and forensic, Dau Shri Vasudev Chandrakar Kamdhenu Vishwavidyalaya, Durg, Chhattisgarh, India
| | - Anil Patyal
- Department of Veterinary Public Health, College of Veterinary Science & A.H., Anjora, Dau Shri Vasudev Chandrakar Kamdhenu Vishwavidyalaya, Durg, Chhattisgarh, India
| | - Nidhi Rawat
- Department of Veterinary Microbiology, College of Veterinary Science & A.H., Anjora, Dau Shri Vasudev Chandrakar Kamdhenu Vishwavidyalaya, Durg, Chhattisgarh, India
| | - Nitin E Gade
- Department of Veterinary Physiology and Biochemistry, College of Veterinary Science & A.H., Anjora, Dau Shri Vasudev Chandrakar Kamdhenu Vishwavidyalaya, Durg, Chhattisgarh, India
| | - S M Tripathi
- Department of Veterinary Pharmacology & Toxicology, College of Veterinary Science & A.H., Anjora, Dau Shri Vasudev Chandrakar Kamdhenu Vishwavidyalaya, Durg, Chhattisgarh, India
| | - M O Kalim
- Department of Veterinary Surgery & Radiology, College of Veterinary Science & A.H., Anjora, Dau Shri Vasudev Chandrakar Kamdhenu Vishwavidyalaya, Durg, Chhattisgarh, India
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9
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Moerke C, Kloss M, Wulf K, Illner S, Kischkel S, Sombetzki M, Grabow N, Reisinger E, Öner A, Ince H. Evaluation of a Murine Model for Testing Antimicrobial Implant Materials in the Blood Circulation System. Biomedicines 2021; 9:1464. [PMID: 34680581 PMCID: PMC8533524 DOI: 10.3390/biomedicines9101464] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2021] [Revised: 10/07/2021] [Accepted: 10/10/2021] [Indexed: 01/08/2023] Open
Abstract
Medical device-related infections are becoming a steadily increasing challenge for the health care system regarding the difficulties in the clinical treatment. In particular, cardiovascular implant infections, catheter-related infections, as well as infective endocarditis are associated with high morbidity and mortality risks for the patients. Antimicrobial materials may help to prevent medical device-associated infections and supplement the currently available therapies. In this study, we present an easy-to-handle and simplified in vivo model to test antimicrobial materials in the bloodstream of mice. The model system is composed of the implantation of a bacteria-laden micro-stent scaffold into the murine tail vein. Our model enables the simulation of catheter-related infections as well as the development of infective endocarditis specific pathologies in combination with material testing. Furthermore, this in vivo model can cover two phases of the biofilm formation, including both the local tissue response to the bacterial biofilm and the systemic inflammatory response against circulating bacteria in the bloodstream that detached from a mature biofilm.
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Affiliation(s)
- Caroline Moerke
- Department of Cardiology, University Medical Center Rostock, 18057 Rostock, Germany; (C.M.); (A.Ö.)
| | - Marlen Kloss
- Division of Tropical Medicine and Infectious Diseases, University Medical Center Rostock, 18057 Rostock, Germany; (M.K.); (M.S.); (E.R.)
| | - Katharina Wulf
- Institute for Biomedical Engineering, University Medical Center Rostock, 18119 Rostock, Germany; (K.W.); (S.I.); (S.K.); (N.G.)
| | - Sabine Illner
- Institute for Biomedical Engineering, University Medical Center Rostock, 18119 Rostock, Germany; (K.W.); (S.I.); (S.K.); (N.G.)
| | - Sabine Kischkel
- Institute for Biomedical Engineering, University Medical Center Rostock, 18119 Rostock, Germany; (K.W.); (S.I.); (S.K.); (N.G.)
| | - Martina Sombetzki
- Division of Tropical Medicine and Infectious Diseases, University Medical Center Rostock, 18057 Rostock, Germany; (M.K.); (M.S.); (E.R.)
| | - Niels Grabow
- Institute for Biomedical Engineering, University Medical Center Rostock, 18119 Rostock, Germany; (K.W.); (S.I.); (S.K.); (N.G.)
| | - Emil Reisinger
- Division of Tropical Medicine and Infectious Diseases, University Medical Center Rostock, 18057 Rostock, Germany; (M.K.); (M.S.); (E.R.)
| | - Alper Öner
- Department of Cardiology, University Medical Center Rostock, 18057 Rostock, Germany; (C.M.); (A.Ö.)
| | - Hüseyin Ince
- Department of Cardiology, University Medical Center Rostock, 18057 Rostock, Germany; (C.M.); (A.Ö.)
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Kumar M, Mathur T, Barman TK, Chaira T, Kumar R, Joshi V, Pandya M, Sharma L, Fujii K, Bandgar M, Jadhav B, Bambal R, Upadhyay D, Masuda N, Verma AK, Bhatnagar PK. Novel FtsZ inhibitor with potent activity against Staphylococcus aureus. J Antimicrob Chemother 2021; 76:2867-2874. [PMID: 34383913 DOI: 10.1093/jac/dkab270] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2021] [Accepted: 06/29/2021] [Indexed: 11/13/2022] Open
Abstract
OBJECTIVES FtsZ is an essential bacterial protein and an unexplored target for the development of antibacterial drugs. The development of a novel inhibitor targeting FtsZ offers a potential opportunity to combat drug resistance. DS01750413, a new derivative of PC190723, is a novel FtsZ inhibitor with improved in vitro and in vivo activity. The objective of this study was to investigate the efficacy of DS01750413 against Staphylococcus spp., including MRSA, in in vitro and in vivo models. METHODS In vitro activities of DS01750413 and standard-of-care antibiotics were evaluated against clinical isolates of Gram-positive pathogens. The in vivo efficacy was evaluated in a murine systemic infection model caused by MRSA. RESULTS DS01750413 showed potent in vitro activity against MRSA clinical isolates with MIC ranges of 0.5-1 mg/L and also demonstrated concentration-dependent bactericidal killing. In the murine bacteraemia infection model of MRSA, treatment with DS01750413 resulted in prolonged survival of animals compared with placebo-treated animals and exhibited a significant reduction in the bacterial load in liver, spleen, lungs and kidneys. CONCLUSIONS DS01750413 showed encouraging in vitro and in vivo activity against MRSA. As a novel chemical class, DS01750413 has the potential to become clinically viable antibiotics to address the drug resistance problem by its unique novel targeting mechanism of action.
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Affiliation(s)
- Manoj Kumar
- Daiichi Sankyo India Pharma Private Limited, Village Sarhaul, Sector-18, Udyog Vihar Industrial Area, Gurgaon 122 015, Haryana, India
| | - Tarun Mathur
- Daiichi Sankyo India Pharma Private Limited, Village Sarhaul, Sector-18, Udyog Vihar Industrial Area, Gurgaon 122 015, Haryana, India
| | - Tarani Kanta Barman
- Daiichi Sankyo India Pharma Private Limited, Village Sarhaul, Sector-18, Udyog Vihar Industrial Area, Gurgaon 122 015, Haryana, India
| | - Tridib Chaira
- Daiichi Sankyo India Pharma Private Limited, Village Sarhaul, Sector-18, Udyog Vihar Industrial Area, Gurgaon 122 015, Haryana, India
| | - Ram Kumar
- Daiichi Sankyo India Pharma Private Limited, Village Sarhaul, Sector-18, Udyog Vihar Industrial Area, Gurgaon 122 015, Haryana, India
| | - Vattan Joshi
- Daiichi Sankyo India Pharma Private Limited, Village Sarhaul, Sector-18, Udyog Vihar Industrial Area, Gurgaon 122 015, Haryana, India
| | - Manisha Pandya
- Daiichi Sankyo India Pharma Private Limited, Village Sarhaul, Sector-18, Udyog Vihar Industrial Area, Gurgaon 122 015, Haryana, India
| | - Lalima Sharma
- Daiichi Sankyo India Pharma Private Limited, Village Sarhaul, Sector-18, Udyog Vihar Industrial Area, Gurgaon 122 015, Haryana, India
| | - Kunihiko Fujii
- Daiichi Sankyo India Pharma Private Limited, Village Sarhaul, Sector-18, Udyog Vihar Industrial Area, Gurgaon 122 015, Haryana, India
| | - Mahadev Bandgar
- Daiichi Sankyo India Pharma Private Limited, Village Sarhaul, Sector-18, Udyog Vihar Industrial Area, Gurgaon 122 015, Haryana, India
| | - Balasaheb Jadhav
- Daiichi Sankyo India Pharma Private Limited, Village Sarhaul, Sector-18, Udyog Vihar Industrial Area, Gurgaon 122 015, Haryana, India
| | - Ramesh Bambal
- Daiichi Sankyo India Pharma Private Limited, Village Sarhaul, Sector-18, Udyog Vihar Industrial Area, Gurgaon 122 015, Haryana, India
| | - Dilip Upadhyay
- Daiichi Sankyo India Pharma Private Limited, Village Sarhaul, Sector-18, Udyog Vihar Industrial Area, Gurgaon 122 015, Haryana, India
| | - Nobuhisa Masuda
- Daiichi Sankyo India Pharma Private Limited, Village Sarhaul, Sector-18, Udyog Vihar Industrial Area, Gurgaon 122 015, Haryana, India
| | - Ashwani Kumar Verma
- Daiichi Sankyo India Pharma Private Limited, Village Sarhaul, Sector-18, Udyog Vihar Industrial Area, Gurgaon 122 015, Haryana, India
| | - Pradip Kumar Bhatnagar
- Daiichi Sankyo India Pharma Private Limited, Village Sarhaul, Sector-18, Udyog Vihar Industrial Area, Gurgaon 122 015, Haryana, India
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11
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Lerche N, Holtfreter S, Walther B, Semmler T, Al'Sholui F, Dancer SJ, Daeschlein G, Hübner NO, Bröker BM, Papke R, Kohlmann T, Baguhl R, Seifert U, Kramer A. Staphylococcus aureus nasal colonization among dental health care workers in Northern Germany (StaphDent study). Int J Med Microbiol 2021; 311:151524. [PMID: 34371345 DOI: 10.1016/j.ijmm.2021.151524] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2021] [Revised: 06/10/2021] [Accepted: 07/16/2021] [Indexed: 10/20/2022] Open
Abstract
Methicillin-resistant Staphylococcus aureus (MRSA) can colonize dental patients and students, however, studies on the prevalence of MRSA and methicillin-susceptible S. aureus (MSSA) among dental health care workers (DHCW) including use of personal protective equipment (PPE) are scarce. We conducted an observational study (StaphDent study) to (I) determine the prevalence of MRSA and MSSA colonization in DHCW in the region of Mecklenburg Western-Pomerania, Germany, (II) resolve the S. aureus population structure to gain hints on possible transmission events between co-workers, and (III) clarify use of PPE. Nasal swabs were obtained from dentists (n = 149), dental assistants (n = 297) and other dental practice staff (n = 38). Clonal relatedness of MSSA isolates was investigated using spa typing and, in some cases, whole genome sequencing (WGS). PPE use was assessed by questionnaire. While 22.3% (108/485) of the participants were colonized with MSSA, MRSA was not detected. MSSA prevalence was not associated with size of dental practices, gender, age, or duration of employment. The identified 61 spa types grouped into 17 clonal complexes and four sequence types. Most spa types (n = 47) were identified only once. In ten dental practices one spa type occurred twice. WGS data analysis confirmed a close clonal relationship for 4/10 isolate pairs. PPE was regularly used by most dentists and assistants. To conclude, the failure to recover MRSA from DHCW reflects the low MRSA prevalence in this region. Widespread PPE use suggests adherence to routine hygiene protocols. Compared to other regional HCW MRSA rates the consequent usage of PPE seems to be protective.
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Affiliation(s)
- Nadine Lerche
- Institute of Hygiene and Environmental Medicine, University Medicine Greifswald, Ferdinand-Sauerbruch-Straße, DE-17475, Greifswald, Germany.
| | - Silva Holtfreter
- Institute of Immunology, University Medicine Greifswald, Ferdinand-Sauerbruch-Straße, DE-17475, Greifswald, Germany.
| | - Birgit Walther
- ZBS 4, Advanced Light and Electron Microscopy, Robert Koch Institute, Seestraße 10, DE-13353, Berlin, Germany.
| | - Torsten Semmler
- Microbial Genomics (NG1), Robert Koch Institute, Nordufer 20, 13353, Berlin, Germany.
| | - Fawaz Al'Sholui
- Institute of Immunology, University Medicine Greifswald, Ferdinand-Sauerbruch-Straße, DE-17475, Greifswald, Germany.
| | - Stephanie J Dancer
- Department of Microbiology, Hairmyres Hospital, NHS Lanarkshire, G75 8RG, UK; School of Applied Sciences, Edinburgh Napier University, Edinburgh, EH11 4BN, UK.
| | - Georg Daeschlein
- Department of Dermatology, University Medicine Greifswald, Ferdinand-Sauerbruch-Straße, DE-17475, Greifswald, Germany.
| | - Nils-Olaf Hübner
- Institute of Hygiene and Environmental Medicine, University Medicine Greifswald, Ferdinand-Sauerbruch-Straße, DE-17475, Greifswald, Germany; Central Unit for Infection Prevention and Control, University Medicine Greifswald, 17475, Greifswald, Germany.
| | - Barbara M Bröker
- Institute of Immunology, University Medicine Greifswald, Ferdinand-Sauerbruch-Straße, DE-17475, Greifswald, Germany.
| | - Roald Papke
- Institute of Hygiene and Environmental Medicine, University Medicine Greifswald, Ferdinand-Sauerbruch-Straße, DE-17475, Greifswald, Germany.
| | - Thomas Kohlmann
- Institute for Community Medicine, Methodical Subdivision, University Medicine Greifswald, Walther-Rathenau-Str. 48, DE-17475, Greifswald, Germany.
| | - Romy Baguhl
- Institute of Hygiene and Environmental Medicine, University Medicine Greifswald, Ferdinand-Sauerbruch-Straße, DE-17475, Greifswald, Germany.
| | - Ulrike Seifert
- Friedrich Loeffler Institute of Medical Microbiology, University Medicine Greifswald, Ferdinand-Sauerbruch-Straße, DE-17475, Greifswald, Germany.
| | - Axel Kramer
- Institute of Hygiene and Environmental Medicine, University Medicine Greifswald, Ferdinand-Sauerbruch-Straße, DE-17475, Greifswald, Germany.
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12
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Pérez M, Robres P, Moreno B, Bolea R, Verde MT, Pérez-Laguna V, Aspiroz C, Gilaberte Y, Rezusta A. Comparison of Antibacterial Activity and Wound Healing in a Superficial Abrasion Mouse Model of Staphylococcus aureus Skin Infection Using Photodynamic Therapy Based on Methylene Blue or Mupirocin or Both. Front Med (Lausanne) 2021; 8:673408. [PMID: 34113639 PMCID: PMC8185160 DOI: 10.3389/fmed.2021.673408] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2021] [Accepted: 04/28/2021] [Indexed: 12/11/2022] Open
Abstract
Background: Antibiotic resistance and impaired wound healing are major concerns in S. aureus superficial skin infections, and new therapies are needed. Antimicrobial photodynamic therapy (aPDT) is a new therapeutic approach for infections, but it also improves healing in many wound models. Objective: To compare the antimicrobial activity and the effects on wound healing of aPDT based on Methylene Blue (MB-aPDT) with mupirocin treatment, either alone or in combination, in superficial skin wounds of S. aureus-infected mice. Additionally, to evaluate the clinical, microbiological, and cosmetic effects on wound healing. Materials and Methods: A superficial skin infection model of S. aureus was established in SKH-1 mice. Infected wounds were treated with MB-aPDT, MB-aPDT with a daily topical mupirocin or only with mupirocin. No treatment was carried out in control animals. Daily clinical and microbiological examinations were performed until complete clinical wound healing. Histopathological studies and statistical analysis were performed at the end of the study. Results: MB-aPDT treatment induced the best wound healing compared to mupirocin alone or to mupirocin plus MB-aPDT. Superficial contraction at 24 h and a greater reduction in size at 48 h, quicker detachment of the crust, less scaling, and absence of scars were observed. Histopathological studies correlated with clinical and gross findings. By contrast, mupirocin showed the highest logaritmic reduction of S. aureus. Conclusions: MB-aPDT and mupirocin treatments are effective in a murine superficial skin infection model of S. aureus. One session of MB-aPDT was the best option for clinical wound healing and cosmetic results. The addition of mupirocin to MB-aPDT treatment improved antimicrobial activity; however, it did not enhance wound healing. No synergistic antibacterial effects were detected.
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Affiliation(s)
- Montserrat Pérez
- Animal Pathology Department, Veterinary Faculty, Zaragoza University, Zaragoza, Spain
| | - Pilar Robres
- Department of Microbiology, Hospital de Barbastro, Huesca, Spain
| | - Bernardino Moreno
- Animal Pathology Department, Veterinary Faculty, Zaragoza University, Zaragoza, Spain
| | - Rosa Bolea
- Animal Pathology Department, Veterinary Faculty, Zaragoza University, Zaragoza, Spain
| | - Maria T. Verde
- Animal Pathology Department, Veterinary Faculty, Zaragoza University, Zaragoza, Spain
| | - Vanesa Pérez-Laguna
- Department of Microbiology, Hospital Universitario Miguel Servet, IIS Aragón, Zaragoza, Spain
| | - Carmen Aspiroz
- Department of Microbiology, Hospital Royo Villanova, IIS Aragón, Zaragoza, Spain
| | - Yolanda Gilaberte
- Department of Dermatology, Hospital Universitario Miguel Servet, IIS Aragón, Zaragoza, Spain
| | - Antonio Rezusta
- Department of Microbiology, Hospital Universitario Miguel Servet, IIS Aragón, Zaragoza, Spain
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13
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Fountain K, Blackett T, Butler H, Carchedi C, Schilling AK, Meredith A, Gibbon MJ, Lloyd DH, Loeffler A, Feil EJ. Fatal exudative dermatitis in island populations of red squirrels ( Sciurus vulgaris): spillover of a virulent Staphylococcus aureus clone (ST49) from reservoir hosts. Microb Genom 2021; 7:000565. [PMID: 34016250 PMCID: PMC8209723 DOI: 10.1099/mgen.0.000565] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2020] [Accepted: 03/22/2021] [Indexed: 01/20/2023] Open
Abstract
Fatal exudative dermatitis (FED) is a significant cause of death of red squirrels (Sciurus vulgaris) on the island of Jersey in the Channel Islands where it is associated with a virulent clone of Staphylococcus aureus, ST49. S. aureus ST49 has been found in other hosts such as small mammals, pigs and humans, but the dynamics of carriage and disease of this clone, or any other lineage in red squirrels, is currently unknown. We used whole-genome sequencing to characterize 228 isolates from healthy red squirrels on Jersey, the Isle of Arran (Scotland) and Brownsea Island (England), from red squirrels showing signs of FED on Jersey and the Isle of Wight (England) and a small number of isolates from other hosts. S. aureus was frequently carried by red squirrels on the Isle of Arran with strains typically associated with small ruminants predominating. For the Brownsea carriage, S. aureus was less frequent and involved strains associated with birds, small ruminants and humans, while for the Jersey carriage S. aureus was rare but ST49 predominated in diseased squirrels. By combining our data with publicly available sequences, we show that the S. aureus carriage in red squirrels largely reflects frequent but facile acquisitions of strains carried by other hosts sharing their habitat ('spillover'), possibly including, in the case of ST188, humans. Genome-wide association analysis of the ruminant lineage ST133 revealed variants in a small number of mostly bacterial-cell-membrane-associated genes that were statistically associated with squirrel isolates from the Isle of Arran, raising the possibility of specific adaptation to red squirrels in this lineage. In contrast there is little evidence that ST49 is a common carriage isolate of red squirrels and infection from reservoir hosts such as bank voles or rats, is likely to be driving the emergence of FED in red squirrels.
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Affiliation(s)
- Kay Fountain
- Department of Biology and Biochemistry, University of Bath, Claverton Down, Bath, BA2 7AY, UK
| | - Tiffany Blackett
- Voluntary Co-ordinator of the JSPCA Animals' Shelter Red Squirrel Disease Surveillance Scheme, JSPCA Animals' Shelter, 89 St Saviours Road, St Helier, Jersey JE2 4GJ, Jersey
| | - Helen Butler
- Wight Squirrel Project, PO Box 33 Nicholson Road, Ryde, Isle of Wight PO33 1BH, UK
| | - Catherine Carchedi
- Department of Clinical Science and Services, Royal Veterinary College, Hatfield, North Mymms, Hertfordshire, AL9 7TA, UK
| | - Anna-Katarina Schilling
- The Royal (Dick) School of Veterinary Studies and The Roslin Institute, University of Edinburgh, Easter Bush Campus, Midlothian, Edinburgh, EH25 9RG, UK
| | - Anna Meredith
- The Royal (Dick) School of Veterinary Studies and The Roslin Institute, University of Edinburgh, Easter Bush Campus, Midlothian, Edinburgh, EH25 9RG, UK
- Melbourne Veterinary School, Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville Campus, Melbourne, VIC, 3010, Australia
| | - Marjorie J. Gibbon
- Department of Biology and Biochemistry, University of Bath, Claverton Down, Bath, BA2 7AY, UK
| | - David H. Lloyd
- Department of Clinical Science and Services, Royal Veterinary College, Hatfield, North Mymms, Hertfordshire, AL9 7TA, UK
| | - Anette Loeffler
- Department of Clinical Science and Services, Royal Veterinary College, Hatfield, North Mymms, Hertfordshire, AL9 7TA, UK
| | - Edward J. Feil
- Department of Biology and Biochemistry, University of Bath, Claverton Down, Bath, BA2 7AY, UK
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14
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Fernandes de Oliveira LM, Steindorff M, Darisipudi MN, Mrochen DM, Trübe P, Bröker BM, Brönstrup M, Tegge W, Holtfreter S. Discovery of Staphylococcus aureus Adhesion Inhibitors by Automated Imaging and Their Characterization in a Mouse Model of Persistent Nasal Colonization. Microorganisms 2021; 9:microorganisms9030631. [PMID: 33803564 PMCID: PMC8002927 DOI: 10.3390/microorganisms9030631] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Revised: 03/10/2021] [Accepted: 03/14/2021] [Indexed: 01/26/2023] Open
Abstract
Due to increasing mupirocin resistance, alternatives for Staphylococcus aureus nasal decolonization are urgently needed. Adhesion inhibitors are promising new preventive agents that may be less prone to induce resistance, as they do not interfere with the viability of S. aureus and therefore exert less selection pressure. We identified promising adhesion inhibitors by screening a library of 4208 compounds for their capacity to inhibit S. aureus adhesion to A-549 epithelial cells in vitro in a novel automated, imaging-based assay. The assay quantified DAPI-stained nuclei of the host cell; attached bacteria were stained with an anti-teichoic acid antibody. The most promising candidate, aurintricarboxylic acid (ATA), was evaluated in a novel persistent S. aureus nasal colonization model using a mouse-adapted S. aureus strain. Colonized mice were treated intranasally over 7 days with ATA using a wide dose range (0.5–10%). Mupirocin completely eliminated the bacteria from the nose within three days of treatment. In contrast, even high concentrations of ATA failed to eradicate the bacteria. To conclude, our imaging-based assay and the persistent colonization model provide excellent tools to identify and validate new drug candidates against S. aureus nasal colonization. However, our first tested candidate ATA failed to induce S. aureus decolonization.
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Affiliation(s)
- Liliane Maria Fernandes de Oliveira
- Institute of Immunology and Transfusion Medicine, Department of Immunology, University Medicine Greifswald, 17475 Greifswald, Germany; (L.M.F.d.O.); (M.N.D.); (D.M.M.); (P.T.); (B.M.B.)
| | - Marina Steindorff
- Helmholtz Centre for Infection Research, Department of Chemical Biology, 38124 Braunschweig, Germany (M.B.)
| | - Murthy N. Darisipudi
- Institute of Immunology and Transfusion Medicine, Department of Immunology, University Medicine Greifswald, 17475 Greifswald, Germany; (L.M.F.d.O.); (M.N.D.); (D.M.M.); (P.T.); (B.M.B.)
| | - Daniel M. Mrochen
- Institute of Immunology and Transfusion Medicine, Department of Immunology, University Medicine Greifswald, 17475 Greifswald, Germany; (L.M.F.d.O.); (M.N.D.); (D.M.M.); (P.T.); (B.M.B.)
| | - Patricia Trübe
- Institute of Immunology and Transfusion Medicine, Department of Immunology, University Medicine Greifswald, 17475 Greifswald, Germany; (L.M.F.d.O.); (M.N.D.); (D.M.M.); (P.T.); (B.M.B.)
| | - Barbara M. Bröker
- Institute of Immunology and Transfusion Medicine, Department of Immunology, University Medicine Greifswald, 17475 Greifswald, Germany; (L.M.F.d.O.); (M.N.D.); (D.M.M.); (P.T.); (B.M.B.)
| | - Mark Brönstrup
- Helmholtz Centre for Infection Research, Department of Chemical Biology, 38124 Braunschweig, Germany (M.B.)
| | - Werner Tegge
- Helmholtz Centre for Infection Research, Department of Chemical Biology, 38124 Braunschweig, Germany (M.B.)
- Correspondence: (W.T.); (S.H.)
| | - Silva Holtfreter
- Institute of Immunology and Transfusion Medicine, Department of Immunology, University Medicine Greifswald, 17475 Greifswald, Germany; (L.M.F.d.O.); (M.N.D.); (D.M.M.); (P.T.); (B.M.B.)
- Correspondence: (W.T.); (S.H.)
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15
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Vlaeminck J, Raafat D, Surmann K, Timbermont L, Normann N, Sellman B, van Wamel WJB, Malhotra-Kumar S. Exploring Virulence Factors and Alternative Therapies against Staphylococcus aureus Pneumonia. Toxins (Basel) 2020; 12:toxins12110721. [PMID: 33218049 PMCID: PMC7698915 DOI: 10.3390/toxins12110721] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2020] [Revised: 11/12/2020] [Accepted: 11/15/2020] [Indexed: 12/13/2022] Open
Abstract
Pneumonia is an acute pulmonary infection associated with high mortality and an immense financial burden on healthcare systems. Staphylococcus aureus is an opportunistic pathogen capable of inducing S. aureus pneumonia (SAP), with some lineages also showing multidrug resistance. Given the high level of antibiotic resistance, much research has been focused on targeting S. aureus virulence factors, including toxins and biofilm-associated proteins, in an attempt to develop effective SAP therapeutics. Despite several promising leads, many hurdles still remain for S. aureus vaccine research. Here, we review the state-of-the-art SAP therapeutics, highlight their pitfalls, and discuss alternative approaches of potential significance and future perspectives.
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Affiliation(s)
- Jelle Vlaeminck
- Laboratory of Medical Microbiology, Vaccine and Infectious Diseases Institute, University of Antwerp, 2610 Antwerp, Belgium; (J.V.); (L.T.)
| | - Dina Raafat
- Department of Immunology, Institute of Immunology and Transfusion Medicine, University Medicine Greifswald, 17475 Greifswald, Germany; (D.R.); (N.N.)
- Department of Microbiology and Immunology, Faculty of Pharmacy, Alexandria University, Alexandria 21521, Egypt
| | - Kristin Surmann
- Department of Functional Genomics, Interfaculty Institute for Genetics and Functional Genomics, University Medicine Greifswald, 17475 Greifswald, Germany;
| | - Leen Timbermont
- Laboratory of Medical Microbiology, Vaccine and Infectious Diseases Institute, University of Antwerp, 2610 Antwerp, Belgium; (J.V.); (L.T.)
| | - Nicole Normann
- Department of Immunology, Institute of Immunology and Transfusion Medicine, University Medicine Greifswald, 17475 Greifswald, Germany; (D.R.); (N.N.)
| | - Bret Sellman
- Microbiome Discovery, Microbial Sciences, BioPharmaceuticals R & D, AstraZeneca, Gaithersburg, MD 20878, USA;
| | - Willem J. B. van Wamel
- Department of Medical Microbiology and Infectious Diseases, Erasmus Medical Center Rotterdam, 3015 Rotterdam, The Netherlands;
| | - Surbhi Malhotra-Kumar
- Laboratory of Medical Microbiology, Vaccine and Infectious Diseases Institute, University of Antwerp, 2610 Antwerp, Belgium; (J.V.); (L.T.)
- Correspondence: ; Tel.: +32-3-265-27-52
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16
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Mrochen DM, Fernandes de Oliveira LM, Raafat D, Holtfreter S. Staphylococcus aureus Host Tropism and Its Implications for Murine Infection Models. Int J Mol Sci 2020; 21:E7061. [PMID: 32992784 PMCID: PMC7582387 DOI: 10.3390/ijms21197061] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2020] [Revised: 09/22/2020] [Accepted: 09/22/2020] [Indexed: 12/11/2022] Open
Abstract
Staphylococcus aureus (S. aureus) is a pathobiont of humans as well as a multitude of animal species. The high prevalence of multi-resistant and more virulent strains of S. aureus necessitates the development of new prevention and treatment strategies for S. aureus infection. Major advances towards understanding the pathogenesis of S. aureus diseases have been made using conventional mouse models, i.e., by infecting naïve laboratory mice with human-adapted S.aureus strains. However, the failure to transfer certain results obtained in these murine systems to humans highlights the limitations of such models. Indeed, numerous S. aureus vaccine candidates showed promising results in conventional mouse models but failed to offer protection in human clinical trials. These limitations arise not only from the widely discussed physiological differences between mice and humans, but also from the lack of attention that is paid to the specific interactions of S. aureus with its respective host. For instance, animal-derived S. aureus lineages show a high degree of host tropism and carry a repertoire of host-specific virulence and immune evasion factors. Mouse-adapted S.aureus strains, humanized mice, and microbiome-optimized mice are promising approaches to overcome these limitations and could improve transferability of animal experiments to human trials in the future.
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Affiliation(s)
- Daniel M. Mrochen
- Department of Immunology, Institute of Immunology and Transfusion Medicine, University Medicine Greifswald, Ferdinand-Sauerbruch-Strasse DZ 7, 17475 Greifswald, Germany; (L.M.F.d.O.); (D.R.); (S.H.)
| | - Liliane M. Fernandes de Oliveira
- Department of Immunology, Institute of Immunology and Transfusion Medicine, University Medicine Greifswald, Ferdinand-Sauerbruch-Strasse DZ 7, 17475 Greifswald, Germany; (L.M.F.d.O.); (D.R.); (S.H.)
| | - Dina Raafat
- Department of Immunology, Institute of Immunology and Transfusion Medicine, University Medicine Greifswald, Ferdinand-Sauerbruch-Strasse DZ 7, 17475 Greifswald, Germany; (L.M.F.d.O.); (D.R.); (S.H.)
- Department of Microbiology and Immunology, Faculty of Pharmacy, Alexandria University, 21521 Alexandria, Egypt
| | - Silva Holtfreter
- Department of Immunology, Institute of Immunology and Transfusion Medicine, University Medicine Greifswald, Ferdinand-Sauerbruch-Strasse DZ 7, 17475 Greifswald, Germany; (L.M.F.d.O.); (D.R.); (S.H.)
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17
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Molecular Epidemiology of Methicillin-Susceptible and Methicillin-Resistant Staphylococcus aureus in Wild, Captive and Laboratory Rats: Effect of Habitat on the Nasal S. aureus Population. Toxins (Basel) 2020; 12:toxins12020080. [PMID: 31991690 PMCID: PMC7076793 DOI: 10.3390/toxins12020080] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2019] [Revised: 01/10/2020] [Accepted: 01/20/2020] [Indexed: 11/16/2022] Open
Abstract
Rats are a reservoir of human- and livestock-associated methicillin-resistant Staphylococcus aureus (MRSA). However, the composition of the natural S. aureus population in wild and laboratory rats is largely unknown. Here, 144 nasal S. aureus isolates from free-living wild rats, captive wild rats and laboratory rats were genotyped and profiled for antibiotic resistances and human-specific virulence genes. The nasal S. aureus carriage rate was higher among wild rats (23.4%) than laboratory rats (12.3%). Free-living wild rats were primarily colonized with isolates of clonal complex (CC) 49 and CC130 and maintained these strains even in husbandry. Moreover, upon livestock contact, CC398 isolates were acquired. In contrast, laboratory rats were colonized with many different S. aureus lineages—many of which are commonly found in humans. Five captive wild rats were colonized with CC398-MRSA. Moreover, a single CC30-MRSA and two CC130-MRSA were detected in free-living or captive wild rats. Rat-derived S. aureus isolates rarely harbored the phage-carried immune evasion gene cluster or superantigen genes, suggesting long-term adaptation to their host. Taken together, our study revealed a natural S. aureus population in wild rats, as well as a colonization pressure on wild and laboratory rats by exposure to livestock- and human-associated S. aureus, respectively.
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