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Radka CD, Frank MW, Simmons TS, Johnson CN, Rosch JW, Rock CO. Staphylococcus aureus oleate hydratase produces ligands that activate host PPARα. Front Cell Infect Microbiol 2024; 14:1352810. [PMID: 38601738 PMCID: PMC11004285 DOI: 10.3389/fcimb.2024.1352810] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2023] [Accepted: 02/26/2024] [Indexed: 04/12/2024] Open
Abstract
Commensal gut bacteria use oleate hydratase to release a spectrum of hydroxylated fatty acids using host-derived unsaturated fatty acids. These compounds are thought to attenuate the immune response, but the underlying signaling mechanism(s) remain to be established. The pathogen Staphylococcus aureus also expresses an oleate hydratase and 10-hydroxyoctadecanoic acid (h18:0) is the most abundant oleate hydratase metabolite found at Staphylococcal skin infection sites. Here, we show h18:0 stimulates the transcription of a set of lipid metabolism genes associated with the activation of peroxisome proliferator activated receptor (PPAR) in the RAW 264.7 macrophage cell line and mouse primary bone marrow-derived macrophages. Cell-based transcriptional reporter assays show h18:0 selectively activates PPARα. Radiolabeling experiments with bone marrow-derived macrophages show [1-14C]h18:0 is not incorporated into cellular lipids, but is degraded by β-oxidation, and mass spectrometry detected shortened fragments of h18:0 released into the media. The catabolism of h18:0 was >10-fold lower in bone marrow-derived macrophages isolated from Ppara -/- knockout mice, and we recover 74-fold fewer S. aureus cells from the skin infection site of Ppara -/- knockout mice compared to wildtype mice. These data identify PPARα as a target for oleate hydratase-derived hydroxy fatty acids and support the existence of an oleate hydratase-PPARα signaling axis that functions to suppress the innate immune response to S. aureus.
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Affiliation(s)
- Christopher D. Radka
- Department of Microbiology, Immunology, and Molecular Genetics, University of Kentucky, Lexington, KY, United States
- Department of Host Microbe Interactions, St. Jude Children’s Research Hospital, Memphis, TN, United States
| | - Matthew W. Frank
- Department of Host Microbe Interactions, St. Jude Children’s Research Hospital, Memphis, TN, United States
| | - Tyler S. Simmons
- Department of Host Microbe Interactions, St. Jude Children’s Research Hospital, Memphis, TN, United States
| | - Cydney N. Johnson
- Department of Host Microbe Interactions, St. Jude Children’s Research Hospital, Memphis, TN, United States
| | - Jason W. Rosch
- Department of Host Microbe Interactions, St. Jude Children’s Research Hospital, Memphis, TN, United States
| | - Charles O. Rock
- Department of Host Microbe Interactions, St. Jude Children’s Research Hospital, Memphis, TN, United States
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2
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Johnson CN, Wilde S, Tuomanen E, Rosch JW. Convergent impact of vaccination and antibiotic pressures on pneumococcal populations. Cell Chem Biol 2024; 31:195-206. [PMID: 38052216 PMCID: PMC10938186 DOI: 10.1016/j.chembiol.2023.11.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2023] [Revised: 09/08/2023] [Accepted: 11/07/2023] [Indexed: 12/07/2023]
Abstract
Streptococcus pneumoniae is a remarkably adaptable and successful human pathogen, playing dual roles of both asymptomatic carriage in the nasopharynx and invasive disease including pneumonia, bacteremia, and meningitis. Efficacious vaccines and effective antibiotic therapies are critical to mitigating morbidity and mortality. However, clinical interventions can be rapidly circumvented by the pneumococcus by its inherent proclivity for genetic exchange. This leads to an underappreciated interplay between vaccine and antibiotic pressures on pneumococcal populations. Circulating populations have undergone dramatic shifts due to the introduction of capsule-based vaccines of increasing valency imparting strong selective pressures. These alterations in population structure have concurrent consequences on the frequency of antibiotic resistance profiles in the population. This review will discuss the interactions of these two selective forces. Understanding and forecasting the drivers of antibiotic resistance and capsule switching are of critical importance for public health, particularly for such a genetically promiscuous pathogen as S. pneumoniae.
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Affiliation(s)
- Cydney N Johnson
- Department of Host-Microbe Interactions, St. Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - Shyra Wilde
- Department of Host-Microbe Interactions, St. Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - Elaine Tuomanen
- Department of Host-Microbe Interactions, St. Jude Children's Research Hospital, Memphis, TN 38105, USA.
| | - Jason W Rosch
- Department of Host-Microbe Interactions, St. Jude Children's Research Hospital, Memphis, TN 38105, USA
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3
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Johnson CN, Wilde S, Tuomanen E, Rosch JW. Meet the authors: Cydney N. Johnson, Shyra Wilde, Elaine Tuomanen, and Jason W. Rosch. Cell Chem Biol 2024; 31:185-186. [PMID: 38364773 DOI: 10.1016/j.chembiol.2024.01.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2024] [Revised: 01/22/2024] [Accepted: 01/22/2024] [Indexed: 02/18/2024]
Abstract
In an interview with Samantha Nelson, a scientific editor for Cell Chemical Biology, the authors of the review entitled "Convergent impact of vaccination and antibiotic pressures on pneumococcal populations" share their perspectives on life as scientists.
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4
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Dao TH, Echlin H, McKnight A, Marr ES, Junker J, Jia Q, Hayden R, van Opijnen T, Isberg RR, Cooper VS, Rosch JW. Streptococcus pneumoniae favors tolerance via metabolic adaptation over resistance to circumvent fluoroquinolones. mBio 2024; 15:e0282823. [PMID: 38193698 PMCID: PMC10865975 DOI: 10.1128/mbio.02828-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2023] [Accepted: 12/01/2023] [Indexed: 01/10/2024] Open
Abstract
Streptococcus pneumoniae is a major human pathogen of global health concern and the rapid emergence of antibiotic resistance poses a serious public health problem worldwide. Fluoroquinolone resistance in S. pneumoniae is an intriguing case because the prevalence of fluoroquinolone resistance does not correlate with increasing usage and has remained rare. Our data indicate that deleterious fitness costs in the mammalian host constrain the emergence of fluoroquinolone resistance both by de novo mutation and recombination. S. pneumoniae was able to circumvent such deleterious fitness costs via the development of antibiotic tolerance through metabolic adaptation that reduced the production of reactive oxygen species, resulting in a fitness benefit during infection of mice treated with fluoroquinolones. These data suggest that the emergence of fluoroquinolone resistance is tightly constrained in S. pneumoniae by fitness tradeoffs and that mutational pathways involving metabolic networks to enable tolerance phenotypes are an important contributor to the evasion of antibiotic-mediated killing.IMPORTANCEThe increasing prevalence of antibiotic resistant bacteria is a major global health concern. While many species have the potential to develop antibiotic resistance, understanding the barriers to resistance emergence in the clinic remains poorly understood. A prime example of this is fluroquinolone resistance in Streptococcus pneumoniae, whereby, despite continued utilization, resistance to this class of antibiotic remains rare. In this study, we found that the predominant pathways for developing resistance to this antibiotic class severely compromised the infectious capacity of the pneumococcus, providing a key impediment for the emergence of resistance. Using in vivo models of experimental evolution, we found that S. pneumoniae responds to repeated fluoroquinolone exposure by modulating key metabolic pathways involved in the generation of redox molecules, which leads to antibiotic treatment failure in the absence of appreciable shifts in resistance levels. These data underscore the complex pathways available to pathogens to evade antibiotic mediating killing via antibiotic tolerance.
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Affiliation(s)
- Tina H. Dao
- Department of Infectious Diseases, St. Jude Children’s Research Hospital, Memphis, Tennessee, USA
| | - Haley Echlin
- Department of Infectious Diseases, St. Jude Children’s Research Hospital, Memphis, Tennessee, USA
| | - Abigail McKnight
- Department of Infectious Diseases, St. Jude Children’s Research Hospital, Memphis, Tennessee, USA
| | - Enolia S. Marr
- Department of Infectious Diseases, St. Jude Children’s Research Hospital, Memphis, Tennessee, USA
| | - Julia Junker
- Nationales Referenzzentrum für Streptokokken Abteilung Medizinische Mikrobiologie, Universitätsklinikum RWTH Aachen, Aachen, Germany
| | - Qidong Jia
- Department of Infectious Diseases, St. Jude Children’s Research Hospital, Memphis, Tennessee, USA
| | - Randall Hayden
- Department of Pathology, St. Jude Children’s Research Hospital, Memphis, Tennessee, USA
| | - Tim van Opijnen
- Broad Institute of MIT and Harvard, Cambridge, Massachusetts, USA
| | - Ralph R. Isberg
- Deptartment of Molecular Biology and Microbiology, Tufts University School of Medicine, Boston, Massachusetts, USA
| | - Vaughn S. Cooper
- Center for Evolutionary Biology and Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
| | - Jason W. Rosch
- Department of Infectious Diseases, St. Jude Children’s Research Hospital, Memphis, Tennessee, USA
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5
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Lass SW, Camphire S, Smith BE, Eutsey RA, Prentice JA, Yerneni SS, Arun A, Bridges AA, Rosch JW, Conway JF, Campbell P, Hiller NL. Pneumococcal Extracellular Vesicles Mediate Horizontal Gene Transfer via the Transformation Machinery. bioRxiv 2023:2023.12.15.571797. [PMID: 38168155 PMCID: PMC10760141 DOI: 10.1101/2023.12.15.571797] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2024]
Abstract
Bacterial cells secrete extracellular vesicles (EVs), the function of which is a matter of intense investigation. Here, we show that the EVs secreted by the human pathogen Streptococcus pneumoniae (pneumococcus) are associated with bacterial DNA on their surface and can deliver this DNA to the transformation machinery of competent cells. These findings suggest that EVs contribute to gene transfer in Gram-positive bacteria, and in doing so, may promote the spread of drug resistance genes in the population.
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Affiliation(s)
- Sarah Werner Lass
- Department of Biological Sciences, Carnegie Mellon University, Pittsburgh, Pennsylvania, USA
| | - Shaw Camphire
- Department of Biological Sciences, Carnegie Mellon University, Pittsburgh, Pennsylvania, USA
| | - Bailey E Smith
- Department of Biological Sciences, Carnegie Mellon University, Pittsburgh, Pennsylvania, USA
| | - Rory A Eutsey
- Department of Biological Sciences, Carnegie Mellon University, Pittsburgh, Pennsylvania, USA
| | - Jojo A Prentice
- Department of Biological Sciences, Carnegie Mellon University, Pittsburgh, Pennsylvania, USA
| | | | - Ashni Arun
- Department of Biological Sciences, Carnegie Mellon University, Pittsburgh, Pennsylvania, USA
| | - Andrew A Bridges
- Department of Biological Sciences, Carnegie Mellon University, Pittsburgh, Pennsylvania, USA
| | - Jason W Rosch
- Department of Infectious Diseases, St Jude Children's Research Hospital, Memphis, TN
| | - James F Conway
- Department of Structural Biology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
| | - Phil Campbell
- Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania, USA
- Engineering Research Accelerator, Carnegie Mellon University, Pennsylvania, USA
| | - N Luisa Hiller
- Department of Biological Sciences, Carnegie Mellon University, Pittsburgh, Pennsylvania, USA
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6
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Echlin H, Iverson A, Sardo U, Rosch JW. Airway proteolytic control of pneumococcal competence. PLoS Pathog 2023; 19:e1011421. [PMID: 37256908 PMCID: PMC10259803 DOI: 10.1371/journal.ppat.1011421] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Revised: 06/12/2023] [Accepted: 05/11/2023] [Indexed: 06/02/2023] Open
Abstract
Streptococcus pneumoniae is an opportunistic pathogen that colonizes the upper respiratory tract asymptomatically and, upon invasion, can lead to severe diseases including otitis media, sinusitis, meningitis, bacteremia, and pneumonia. One of the first lines of defense against pneumococcal invasive disease is inflammation, including the recruitment of neutrophils to the site of infection. The invasive pneumococcus can be cleared through the action of serine proteases generated by neutrophils. It is less clear how serine proteases impact non-invasive pneumococcal colonization, which is the key first step to invasion and transmission. One significant aspect of pneumococcal biology and adaptation in the respiratory tract is its natural competence, which is triggered by a small peptide CSP. In this study, we investigate if serine proteases are capable of degrading CSP and the impact this has on pneumococcal competence. We found that CSP has several potential sites for trypsin-like serine protease degradation and that there were preferential cleavage sites recognized by the proteases. Digestion of CSP with two different trypsin-like serine proteases dramatically reduced competence in a dose-dependent manner. Incubation of CSP with mouse lung homogenate also reduced recombination frequency of the pneumococcus. These ex vivo experiments suggested that serine proteases in the lower respiratory tract reduce pneumococcal competence. This was subsequently confirmed measuring in vivo recombination frequencies after induction of protease production via poly (I:C) stimulation and via co-infection with influenza A virus, which dramatically lowered recombination events. These data shed light on a new mechanism by which the host can modulate pneumococcal behavior and genetic exchange via direct degradation of the competence signaling peptide.
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Affiliation(s)
- Haley Echlin
- Department of Infectious Diseases, St Jude Children’s Research Hospital, Memphis, Tennessee, United States of America
| | - Amy Iverson
- Department of Infectious Diseases, St Jude Children’s Research Hospital, Memphis, Tennessee, United States of America
| | - Ugo Sardo
- Department of Infectious Diseases, St Jude Children’s Research Hospital, Memphis, Tennessee, United States of America
| | - Jason W. Rosch
- Department of Infectious Diseases, St Jude Children’s Research Hospital, Memphis, Tennessee, United States of America
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7
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Dao TH, Iverson A, Neville SL, Johnson MDL, McDevitt CA, Rosch JW. The role of CopA in Streptococcus pyogenes copper homeostasis and virulence. J Inorg Biochem 2023; 240:112122. [PMID: 36639322 PMCID: PMC10161136 DOI: 10.1016/j.jinorgbio.2023.112122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2022] [Revised: 01/03/2023] [Accepted: 01/04/2023] [Indexed: 01/09/2023]
Abstract
Maintenance of intracellular metal homeostasis during interaction with host niches is critical to the success of bacterial pathogens. To prevent infection, the mammalian innate immune response employs metal-withholding and metal-intoxication mechanisms to limit bacterial propagation. The first-row transition metal ion copper serves critical roles at the host-pathogen interface and has been associated with antimicrobial activity since antiquity. Despite lacking any known copper-utilizing proteins, streptococci have been reported to accumulate significant levels of copper. Here, we report that loss of CopA, a copper-specific exporter, confers increased sensitivity to copper in Streptococcus pyogenes strain HSC5, with prolonged exposure to physiological levels of copper resulting in reduced viability during stationary phase cultivation. This defect in stationary phase survival was rescued by supplementation with exogeneous amino acids, indicating the pathogen had altered nutritional requirements during exposure to copper stress. Furthermore, S. pyogenes HSC5 ΔcopA was substantially attenuated during murine soft-tissue infection, demonstrating the importance of copper efflux at the host-pathogen interface. Collectively, these data indicate that copper can severely reduce the viability of stationary phase S. pyogenes and that active efflux mechanisms are required to survive copper stress in vitro and during infection.
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Affiliation(s)
- Tina H Dao
- St. Jude Children's Research Hospital, Department of Infectious Diseases, 262 Danny Thomas Place, Memphis, TN 38105, USA
| | - Amy Iverson
- St. Jude Children's Research Hospital, Department of Infectious Diseases, 262 Danny Thomas Place, Memphis, TN 38105, USA
| | - Stephanie L Neville
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Victoria 3000, Australia
| | - Michael D L Johnson
- St. Jude Children's Research Hospital, Department of Infectious Diseases, 262 Danny Thomas Place, Memphis, TN 38105, USA; Department of Immunobiology, BIO5 Institute, Valley Fever Center for Excellence, and Asthma and Airway Disease Research Center, University of Arizona College of Medicine - Tucson, Tucson, AZ 85724, USA
| | - Christopher A McDevitt
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Victoria 3000, Australia
| | - Jason W Rosch
- St. Jude Children's Research Hospital, Department of Infectious Diseases, 262 Danny Thomas Place, Memphis, TN 38105, USA.
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8
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York A, Huynh E, Mbodj S, Yolda-Carr D, Hislop MS, Echlin H, Rosch JW, Weinberger DM, Wyllie AL. Magnetic bead-based separation of pneumococcal serotypes. Cell Rep Methods 2023; 3:100410. [PMID: 36936076 PMCID: PMC10014298 DOI: 10.1016/j.crmeth.2023.100410] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2022] [Revised: 11/18/2022] [Accepted: 01/26/2023] [Indexed: 02/23/2023]
Abstract
The separation of pneumococcal serotypes from a complex polymicrobial mixture may be required for different applications. For instance, a minority strain could be present at a low frequency in a clinical sample, making it difficult to identify and isolate by traditional culture-based methods. We therefore developed an assay to separate mixed pneumococcal samples using serotype-specific antiserum and a magnetic bead-based separation method. Using qPCR and colony counting methods, we first show that serotypes (12F, 23F, 3, 14, 19A, and 15A) present at ∼0.1% of a dual serotype mixture can be enriched to between 10% and 90% of the final sample. We demonstrate two applications for this method: extraction of known pneumococcal serotypes from saliva samples and efficient purification of capsule switch variants from experimental transformation experiments. This method may have further laboratory or clinical applications when the selection of specific serotypes is required.
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Affiliation(s)
- Anna York
- Department of Epidemiology of Microbial Diseases, Yale School of Public Health, New Haven, CT 06510, USA
| | - Emily Huynh
- Department of Epidemiology of Microbial Diseases, Yale School of Public Health, New Haven, CT 06510, USA
| | - Sidiya Mbodj
- Department of Epidemiology of Microbial Diseases, Yale School of Public Health, New Haven, CT 06510, USA
| | - Devyn Yolda-Carr
- Department of Epidemiology of Microbial Diseases, Yale School of Public Health, New Haven, CT 06510, USA
| | - Maikel S. Hislop
- Department of Epidemiology of Microbial Diseases, Yale School of Public Health, New Haven, CT 06510, USA
- Department of Life Sciences and Chemistry, Utrecht University of Applied Sciences, 3584 CS Utrecht, the Netherlands
| | - Haley Echlin
- Department of Infectious Disease, St. Jude Children’s Research Hospital, Memphis, TN 38105, USA
| | - Jason W. Rosch
- Department of Infectious Disease, St. Jude Children’s Research Hospital, Memphis, TN 38105, USA
| | - Daniel M. Weinberger
- Department of Epidemiology of Microbial Diseases, Yale School of Public Health, New Haven, CT 06510, USA
| | - Anne L. Wyllie
- Department of Epidemiology of Microbial Diseases, Yale School of Public Health, New Haven, CT 06510, USA
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9
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Nishimoto AT, Dao TH, Jia Q, Ortiz-Marquez JC, Echlin H, Vogel P, van Opijnen T, Rosch JW. Interspecies recombination, not de novo mutation, maintains virulence after β-lactam resistance acquisition in Streptococcus pneumoniae. Cell Rep 2022; 41:111835. [PMID: 36516783 PMCID: PMC9850807 DOI: 10.1016/j.celrep.2022.111835] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2021] [Revised: 07/26/2022] [Accepted: 11/22/2022] [Indexed: 12/15/2022] Open
Abstract
As opposed to de novo mutation, β-lactam resistance in S. pneumoniae is often conferred via homologous recombination during horizontal gene transfer. We hypothesize that β-lactam resistance in pathogenic streptococci is restricted to naturally competent species via intra-/interspecies recombination due to in vivo fitness trade-offs of de novo penicillin-binding protein (PBP) mutations. We show that de novo mutant populations have abrogated invasive disease capacity and are difficult to evolve in vivo. Conversely, serially transformed recombinant strains efficiently integrate resistant oral streptococcal DNA, gain penicillin resistance and tolerance, and retain virulence in mice. Large-scale changes in pbp2X, pbp2B, and non-PBP-related genes occur in recombinant isolates. Our results indicate that horizontal transfer of β-lactam resistance engenders initially favorable or minimal cost changes in vivo compared with de novo mutation(s), underscoring the importance of recombination in the emergence of β-lactam resistance and suggesting why some pathogenic streptococci lacking innate competence remain universally susceptible.
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Affiliation(s)
- Andrew T. Nishimoto
- Department of Infectious Diseases, St. Jude Children’s Research Hospital, Memphis, TN 38105, USA,These authors contributed equally
| | - Tina H. Dao
- Department of Infectious Diseases, St. Jude Children’s Research Hospital, Memphis, TN 38105, USA,These authors contributed equally
| | - Qidong Jia
- Department of Infectious Diseases, St. Jude Children’s Research Hospital, Memphis, TN 38105, USA
| | | | - Haley Echlin
- Department of Infectious Diseases, St. Jude Children’s Research Hospital, Memphis, TN 38105, USA
| | - Peter Vogel
- Department of Pathology and Veterinary Pathology Core, St. Jude Children’s Research Hospital, Memphis, TN 38105, USA
| | - Tim van Opijnen
- Department of Biology, Boston College, Boston, MA 02467, USA,Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA
| | - Jason W. Rosch
- Department of Infectious Diseases, St. Jude Children’s Research Hospital, Memphis, TN 38105, USA,Lead contact,Correspondence:
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Rosconi F, Rudmann E, Li J, Surujon D, Anthony J, Frank M, Jones DS, Rock C, Rosch JW, Johnston CD, van Opijnen T. A bacterial pan-genome makes gene essentiality strain-dependent and evolvable. Nat Microbiol 2022; 7:1580-1592. [PMID: 36097170 PMCID: PMC9519441 DOI: 10.1038/s41564-022-01208-7] [Citation(s) in RCA: 25] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2022] [Accepted: 07/21/2022] [Indexed: 11/09/2022]
Abstract
Many bacterial species are represented by a pan-genome, whose genetic repertoire far outstrips that of any single bacterial genome. Here we investigate how a bacterial pan-genome might influence gene essentiality and whether essential genes that are initially critical for the survival of an organism can evolve to become non-essential. By using Transposon insertion sequencing (Tn-seq), whole-genome sequencing and RNA-seq on a set of 36 clinical Streptococcus pneumoniae strains representative of >68% of the species' pan-genome, we identify a species-wide 'essentialome' that can be subdivided into universal, core strain-specific and accessory essential genes. By employing 'forced-evolution experiments', we show that specific genetic changes allow bacteria to bypass essentiality. Moreover, by untangling several genetic mechanisms, we show that gene essentiality can be highly influenced by and/or be dependent on: (1) the composition of the accessory genome, (2) the accumulation of toxic intermediates, (3) functional redundancy, (4) efficient recycling of critical metabolites and (5) pathway rewiring. While this functional characterization underscores the evolvability potential of many essential genes, we also show that genes with differential essentiality remain important antimicrobial drug target candidates, as their inactivation almost always has a severe fitness cost in vivo.
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Affiliation(s)
| | - Emily Rudmann
- Biology Department, Boston College, Chestnut Hill, MA, USA
| | - Jien Li
- Biology Department, Boston College, Chestnut Hill, MA, USA
| | - Defne Surujon
- Biology Department, Boston College, Chestnut Hill, MA, USA
| | - Jon Anthony
- Biology Department, Boston College, Chestnut Hill, MA, USA
| | - Matthew Frank
- Department of Infectious Diseases, St Jude Children's Research Hospital, Memphis, TN, USA
| | - Dakota S Jones
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, WA, USA
| | - Charles Rock
- Department of Infectious Diseases, St Jude Children's Research Hospital, Memphis, TN, USA
| | - Jason W Rosch
- Department of Infectious Diseases, St Jude Children's Research Hospital, Memphis, TN, USA
| | - Christopher D Johnston
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, WA, USA
| | - Tim van Opijnen
- Biology Department, Boston College, Chestnut Hill, MA, USA.
- Broad Institute of MIT and Harvard, Cambridge, MA, USA.
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11
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Leshchiner D, Rosconi F, Sundaresh B, Rudmann E, Ramirez LMN, Nishimoto AT, Wood SJ, Jana B, Buján N, Li K, Gao J, Frank M, Reeve SM, Lee RE, Rock CO, Rosch JW, van Opijnen T. A genome-wide atlas of antibiotic susceptibility targets and pathways to tolerance. Nat Commun 2022; 13:3165. [PMID: 35672367 PMCID: PMC9174251 DOI: 10.1038/s41467-022-30967-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2022] [Accepted: 05/26/2022] [Indexed: 11/10/2022] Open
Abstract
Detailed knowledge on how bacteria evade antibiotics and eventually develop resistance could open avenues for novel therapeutics and diagnostics. It is thereby key to develop a comprehensive genome-wide understanding of how bacteria process antibiotic stress, and how modulation of the involved processes affects their ability to overcome said stress. Here we undertake a comprehensive genetic analysis of how the human pathogen Streptococcus pneumoniae responds to 20 antibiotics. We build a genome-wide atlas of drug susceptibility determinants and generated a genetic interaction network that connects cellular processes and genes of unknown function, which we show can be used as therapeutic targets. Pathway analysis reveals a genome-wide atlas of cellular processes that can make a bacterium less susceptible, and often tolerant, in an antibiotic specific manner. Importantly, modulation of these processes confers fitness benefits during active infections under antibiotic selection. Moreover, screening of sequenced clinical isolates demonstrates that mutations in genes that decrease antibiotic sensitivity and increase tolerance readily evolve and are frequently associated with resistant strains, indicating such mutations could be harbingers for the emergence of antibiotic resistance.
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Affiliation(s)
| | - Federico Rosconi
- Biology Department, Boston College, Chestnut Hill, MA, 02467, USA
| | | | - Emily Rudmann
- Biology Department, Boston College, Chestnut Hill, MA, 02467, USA
| | | | - Andrew T Nishimoto
- Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, TN, 38105, USA
| | - Stephen J Wood
- Biology Department, Boston College, Chestnut Hill, MA, 02467, USA
| | - Bimal Jana
- Biology Department, Boston College, Chestnut Hill, MA, 02467, USA
| | - Noemí Buján
- Biology Department, Boston College, Chestnut Hill, MA, 02467, USA
| | - Kaicheng Li
- Chemistry Department, Boston College, Chestnut Hill, MA, 02467, USA
| | - Jianmin Gao
- Chemistry Department, Boston College, Chestnut Hill, MA, 02467, USA
| | - Matthew Frank
- Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, TN, 38105, USA
| | - Stephanie M Reeve
- Department of Chemical Biology and Therapeutics, St. Jude Children's Research Hospital, Memphis, TN, 38105, USA
| | - Richard E Lee
- Department of Chemical Biology and Therapeutics, St. Jude Children's Research Hospital, Memphis, TN, 38105, USA
| | - Charles O Rock
- Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, TN, 38105, USA
| | - Jason W Rosch
- Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, TN, 38105, USA
| | - Tim van Opijnen
- Biology Department, Boston College, Chestnut Hill, MA, 02467, USA.
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12
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Huo W, Busch LM, Hernandez-Bird J, Hamami E, Marshall CW, Geisinger E, Cooper VS, van Opijnen T, Rosch JW, Isberg RR. Immunosuppression broadens evolutionary pathways to drug resistance and treatment failure during Acinetobacter baumannii pneumonia in mice. Nat Microbiol 2022; 7:796-809. [PMID: 35618774 PMCID: PMC9159950 DOI: 10.1038/s41564-022-01126-8] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2021] [Accepted: 04/20/2022] [Indexed: 01/02/2023]
Abstract
Acinetobacter baumannii is increasingly refractory to antibiotic treatment in healthcare settings. As is true of most human pathogens, the genetic path to antimicrobial resistance (AMR) and the role that the immune system plays in modulating AMR during disease are poorly understood. Here we reproduced several routes to fluoroquinolone resistance, performing evolution experiments using sequential lung infections in mice that are replete with or depleted of neutrophils, providing two key insights into the evolution of drug resistance. First, neutropenic hosts acted as reservoirs for the accumulation of drug resistance during drug treatment. Selection for variants with altered drug sensitivity profiles arose readily in the absence of neutrophils, while immunocompetent animals restricted the appearance of these variants. Secondly, antibiotic treatment failure in the immunocompromised host was shown to occur without clinically defined resistance, an unexpected result that provides a model for how antibiotic failure occurs clinically in the absence of AMR. The genetic mechanism underlying both these results is initiated by mutations activating the drug egress pump regulator AdeL, which drives persistence in the presence of antibiotic. Therefore, antibiotic persistence mutations present a two-pronged risk during disease, causing drug treatment failure in the immunocompromised host while simultaneously increasing the emergence of high-level AMR.
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Affiliation(s)
- Wenwen Huo
- Department of Molecular Biology and Microbiology, Tufts University School of Medicine, Boston, MA, USA
| | - Lindsay M Busch
- Department of Molecular Biology and Microbiology, Tufts University School of Medicine, Boston, MA, USA
- Division of Infectious Diseases, Emory University School of Medicine, Atlanta, GA, USA
| | - Juan Hernandez-Bird
- Department of Molecular Biology and Microbiology, Tufts University School of Medicine, Boston, MA, USA
| | - Efrat Hamami
- Department of Molecular Biology and Microbiology, Tufts University School of Medicine, Boston, MA, USA
| | - Christopher W Marshall
- Department of Microbiology and Molecular Genetics and Center for Evolutionary Biology and Medicine, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
- Department of Biological Sciences, Marquette University, Milwaukee, WI, USA
| | | | - Vaughn S Cooper
- Department of Microbiology and Molecular Genetics and Center for Evolutionary Biology and Medicine, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | | | - Jason W Rosch
- Department of Infectious Diseases, St Jude Children's Research Hospital, Memphis, TN, USA
| | - Ralph R Isberg
- Department of Molecular Biology and Microbiology, Tufts University School of Medicine, Boston, MA, USA.
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13
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Kennedy II DE, Mody P, Gout JF, Tan W, Seo KS, Olivier AK, Rosch JW, Thornton JA. Contribution of Puma to Inflammatory Resolution During Early Pneumococcal Pneumonia. Front Cell Infect Microbiol 2022; 12:886901. [PMID: 35694536 PMCID: PMC9177954 DOI: 10.3389/fcimb.2022.886901] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2022] [Accepted: 04/25/2022] [Indexed: 11/17/2022] Open
Abstract
Apoptosis of cells at the site of infection is a requirement for shutdown of inflammatory signaling, avoiding tissue damage, and preventing progression of sepsis. Puma+/+ and Puma-/- mice were challenged with TIGR4 strain pneumococcus and cytokines were quantitated from lungs and blood using a magnetic bead panel analysis. Puma-/- mice exhibited higher lung and blood cytokine levels of several major inflammatory cytokines, including IL-6, G-CSF, RANTES, IL-12, IFN-ϒ, and IP-10. Puma-/- mice were more susceptible to bacterial dissemination and exhibited more weight loss than their wild-type counterparts. RNA sequencing analysis of whole pulmonary tissue revealed Puma-dependent regulation of Nrxn2, Adam19, and Eln. Enrichment of gene ontology groups differentially expressed in Puma-/- tissues were strongly correlated to IFN-β and -ϒ signaling. Here, we demonstrate for the first time the role of Puma in prohibition of the cytokine storm during bacterial pneumonia. These findings further suggest a role for targeting immunomodulation of IFN signaling during pulmonary inflammation. Additionally, our findings suggest previously undemonstrated roles for genes encoding regulatory and binding proteins during the early phase of the innate immune response of pneumococcal pneumonia.
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Affiliation(s)
- Daniel E. Kennedy II
- Department of Biological Sciences, Mississippi State University, Starkville, MS, United States
| | - Perceus Mody
- Department of Biological Sciences, Mississippi State University, Starkville, MS, United States
| | - Jean-Francois Gout
- Department of Biological Sciences, Mississippi State University, Starkville, MS, United States
| | - Wei Tan
- Department of Comparative Biomedical Sciences, College of Veterinary Medicine, Mississippi State University, Starkville, MS, United States
| | - Keun Seok Seo
- Department of Comparative Biomedical Sciences, College of Veterinary Medicine, Mississippi State University, Starkville, MS, United States
| | - Alicia K. Olivier
- Department of Population and Pathobiology, College of Veterinary Medicine, Mississippi State University, Starkville, MS, United States
| | - Jason W. Rosch
- Department of Infectious Diseases, St. Jude Children’s Research Hospital, Memphis, TN, United States
| | - Justin A. Thornton
- Department of Biological Sciences, Mississippi State University, Starkville, MS, United States
- *Correspondence: Justin A. Thornton,
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14
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Mueller Brown K, Le Sage V, French AJ, Jones JE, Padovani GH, Avery AJ, Schultz-Cherry S, Rosch JW, Hiller NL, Lakdawala SS. Secondary infection with Streptococcus pneumoniae decreases influenza virus replication and is linked to severe disease. FEMS Microbes 2022; 3:xtac007. [PMID: 35392116 PMCID: PMC8981988 DOI: 10.1093/femsmc/xtac007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2021] [Revised: 01/31/2022] [Accepted: 03/02/2022] [Indexed: 11/29/2022] Open
Abstract
Secondary bacterial infection is a common complication in severe influenza virus infections. During the H1N1 pandemic of 2009, increased mortality was observed among healthy young adults due to secondary bacterial pneumonia, one of the most frequent bacterial species being Streptococcus pneumoniae (Spn). Previous studies in mice and ferrets have suggested a synergistic relationship between Spn and influenza viruses. In this study, the ferret model was used to examine whether secondary Spn infection (strains BHN97 and D39) influence replication and airborne transmission of the 2009 pandemic H1N1 virus (H1N1pdm09). Secondary infection with Spn after H1N1pdm09 infection consistently resulted in a significant decrease in viral titers in the ferret nasal washes. While secondary Spn infection appeared to negatively impact influenza virus replication, animals precolonized with Spn were equally susceptible to H1N1pdm09 airborne transmission. In line with previous work, ferrets with preceding H1N1pdm09 and secondary Spn infection had increased bacterial loads and more severe clinical symptoms as compared to animals infected with H1N1pdm09 or Spn alone. Interestingly, the donor animals that displayed the most severe clinical symptoms had reduced airborne transmission of H1N1pdm09. Based on these data, we propose an asymmetrical relationship between these two pathogens, rather than a synergistic one, since secondary bacterial infection enhances Spn colonization and pathogenesis but decreases viral titers.
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Affiliation(s)
- Karina Mueller Brown
- Department of Biological Sciences, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, PA 15213, USA
| | - Valerie Le Sage
- Department of Microbiology and Molecular Genetics, University of Pittsburgh School of Medicine, 450 Technology Drive, Bridgeside Point II, Pittsburgh, PA 15219, USA
| | - Andrea J French
- Department of Microbiology and Molecular Genetics, University of Pittsburgh School of Medicine, 450 Technology Drive, Bridgeside Point II, Pittsburgh, PA 15219, USA
| | - Jennifer E Jones
- Department of Microbiology and Molecular Genetics, University of Pittsburgh School of Medicine, 450 Technology Drive, Bridgeside Point II, Pittsburgh, PA 15219, USA
| | - Gabriella H Padovani
- Department of Microbiology and Molecular Genetics, University of Pittsburgh School of Medicine, 450 Technology Drive, Bridgeside Point II, Pittsburgh, PA 15219, USA
| | - Annika J Avery
- Department of Microbiology and Molecular Genetics, University of Pittsburgh School of Medicine, 450 Technology Drive, Bridgeside Point II, Pittsburgh, PA 15219, USA
| | - Stacey Schultz-Cherry
- Department of Infectious Diseases, St Jude Children's Research Hospital, 262 Danny Thomas Place, Memphis, TN 38105, USA
| | - Jason W Rosch
- Department of Infectious Diseases, St Jude Children's Research Hospital, 262 Danny Thomas Place, Memphis, TN 38105, USA
| | - N Luisa Hiller
- Department of Biological Sciences, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, PA 15213, USA
| | - Seema S Lakdawala
- Department of Microbiology and Molecular Genetics, University of Pittsburgh School of Medicine, 450 Technology Drive, Bridgeside Point II, Pittsburgh, PA 15219, USA
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15
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Ganaie F, Branche AR, Peasley M, Rosch JW, Nahm MH. Oral streptococci expressing pneumococci-like cross-reactive capsule types can affect WHO recommended pneumococcal carriage procedure. Clin Infect Dis 2021; 75:647-656. [PMID: 34891152 DOI: 10.1093/cid/ciab1003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND Carriage studies are fundamental to assess the effects of pneumococcal vaccines. Since a large proportion of oral streptococci carry homologs of pneumococcal genes, nonculture-based detection and serotyping of upper respiratory tract (URT) samples can be problematic. Herein, we investigated if culture-free molecular methods could differentiate pneumococci from oral streptococci carried by adults in URT. METHODS Paired nasopharyngeal (NP) and oropharyngeal (OP) samples were collected from 100 older adults twice a month for one year. Extracts from the combined NP+OP samples (n=2400) were subjected to lytA real-time PCR. Positive samples were subjected to pure culture isolation followed by species confirmation using multiple approaches. Multibead assay and whole-genome sequencing were used for serotyping. RESULTS lytA-PCR was positive in 301 combined NP+OP extracts, 20 of which grew probable pneumococcal-like colonies based on colony morphology and biochemical tests. Multiple approaches confirmed that four isolates were S. pneumoniae, three were S. psuedopneumoniae, and thirteen were S. mitis. Eight nonpneumococcal strains carried pneumococcus-like cps loci (size: ~18 to 25 kb) that showed >70% of nucleotide identity with their pneumococcal counterparts. While investigating the antigenic profile, we found some S. mitis strains (P066 and P107) reacted with both serotype-specific polyclonal (Type 39 and FS17b) and monoclonal (Hyp10AG1 and Hyp17FM1) antisera, whereas some strains (P063 and P074) reacted only with polyclonal antisera (Type 5 and FS35a). CONCLUSION The extensive capsular overlap suggests that pneumococcal vaccines could reduce carriage of oral streptococci expressing cross-reactive capsules. Further, direct use of culture-free PCR-based methods in URT samples has limited usefulness for carriage studies.
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Affiliation(s)
- Feroze Ganaie
- Department of Medicine, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Angela R Branche
- Department of Medicine, University of Rochester, Rochester, NY, USA
| | - Michael Peasley
- Department of Medicine, University of Rochester, Rochester, NY, USA
| | - Jason W Rosch
- Department of Infectious Diseases, St Jude Children's Research Hospital, Memphis, TN, USA
| | - Moon H Nahm
- Department of Medicine, University of Alabama at Birmingham, Birmingham, AL, USA
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16
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Abstract
Streptococcus pneumoniae is a highly adept human pathogen. A frequent asymptomatic member of the respiratory microbiota, the pneumococcus has a remarkable capacity to cause mucosal (pneumonia and otitis media) and invasive diseases (bacteremia, meningitis). In addition, the organism utilizes a vast battery of virulence factors for tissue and immune evasion. Though recognized as a significant cause of pneumonia for over a century, efforts to develop more effective vaccines remain ongoing. The pathogen’s inherent capacity to exchange genetic material is critical to the pneumococcus’ success. This feature historically facilitated essential discoveries in genetics and is vital for disseminating antibiotic resistance and vaccine evasion.
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Affiliation(s)
- Tina H Dao
- Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis TN 38105, USA
| | - Jason W Rosch
- Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis TN 38105, USA
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17
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Burcham LR, Hill RA, Caulkins RC, Emerson JP, Nanduri B, Rosch JW, Fitzkee NC, Thornton JA. Streptococcus pneumoniae metal homeostasis alters cellular metabolism. Metallomics 2021; 12:1416-1427. [PMID: 32676626 DOI: 10.1039/d0mt00118j] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Streptococcus pneumoniae colonizes the human nasopharyngeal mucosa and is a leading cause of community-acquired pneumonia, acute otitis media, and bacterial meningitis. Metal ion homeostasis is vital to the survival of this pathogen across diverse biological sites and contributes significantly to colonization and invasive disease. Microarray and qRT-PCR analysis revealed an upregulation of an uncharacterized operon (SP1433-1438) in pneumococci subjected to metal-chelation by N,N,N',N'-tetrakis-(2-pyridylmethyl)ethylenediamine (TPEN). Supplementation of zinc, cobalt, and nickel following TPEN treatment significantly abrogated induction. BLASTP comparisons and protein topology analysis predicted this locus to encode components of ATP binding cassette (ABC) transporters involved in multidrug resistance (SP1434-1435) and energy-coupling factor (ECF) transporters (SP1436-1438). Inductively coupled plasma mass spectrometry (ICP-MS) analysis identified differences in intracellular metal content in a Δ1434-8 mutant strain compared to parental T4R. Further, analysis of the secreted metabolome of WT and Δ1434-8 strains identified significant changes in pneumococcal glycolytic and amino acid metabolic pathways, indicating a shift towards mixed acid fermentation. Additionally, proteomic analysis revealed differentially expressed proteins in the Δ1434-8 mutant strain, with nearly 20% regulated by the global catabolite repressor, CcpA. Based on these findings, we propose that the transporters encoded by SP1433-1438 are involved in regulating the central metabolism of S. pneumoniae and contributing to bacterial survival during metal stress.
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Affiliation(s)
- Lindsey R Burcham
- Department of Biological Sciences, Mississippi State University, Mississippi State MS 39762, USA.
| | - Rebecca A Hill
- Department of Chemistry, Mississippi State University, Mississippi State MS 39762, USA
| | - Rachel C Caulkins
- Department of Biological Sciences, Mississippi State University, Mississippi State MS 39762, USA.
| | - Joseph P Emerson
- Department of Chemistry, Mississippi State University, Mississippi State MS 39762, USA
| | - Bindu Nanduri
- Department of Basic Sciences, College of Veterinary Medicine, Mississippi State University, Mississippi State MS 39762, USA
| | - Jason W Rosch
- Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - Nicholas C Fitzkee
- Department of Chemistry, Mississippi State University, Mississippi State MS 39762, USA
| | - Justin A Thornton
- Department of Biological Sciences, Mississippi State University, Mississippi State MS 39762, USA.
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18
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Green AE, Howarth D, Chaguza C, Echlin H, Langendonk RF, Munro C, Barton TE, Hinton JCD, Bentley SD, Rosch JW, Neill DR. Pneumococcal Colonization and Virulence Factors Identified Via Experimental Evolution in Infection Models. Mol Biol Evol 2021; 38:2209-2226. [PMID: 33502519 PMCID: PMC8136498 DOI: 10.1093/molbev/msab018] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Streptococcus pneumoniae is a commensal of the human nasopharynx and a major cause of respiratory and invasive disease. We examined adaptation and evolution of pneumococcus, within nasopharynx and lungs, in an experimental system where the selective pressures associated with transmission were removed. This was achieved by serial passage of pneumococci, separately, in mouse models of nasopharyngeal carriage or pneumonia. Passaged pneumococci became more effective colonizers of the respiratory tract and we observed several examples of potential parallel evolution. The cell wall-modifying glycosyltransferase LafA was under strong selection during lung passage, whereas the surface expressed pneumococcal vaccine antigen gene pvaA and the glycerol-3-phosphate dehydrogenase gene gpsA were frequent targets of mutation in nasopharynx-passaged pneumococci. These mutations were not identified in pneumococci that were separately evolved by serial passage on laboratory agar. We focused on gpsA, in which the same single nucleotide polymorphism arose in two independently evolved nasopharynx-passaged lineages. We describe a new role for this gene in nasopharyngeal carriage and show that the identified single nucleotide change confers resistance to oxidative stress and enhanced nasopharyngeal colonization potential. We demonstrate that polymorphisms in gpsA arise and are retained during human colonization. These findings highlight how within-host environmental conditions can determine trajectories of bacterial evolution. Relative invasiveness or attack rate of pneumococcal lineages may be defined by genes that make niche-specific contributions to bacterial fitness. Experimental evolution in animal infection models is a powerful tool to investigate the relative roles played by pathogen virulence and colonization factors within different host niches.
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Affiliation(s)
- Angharad E Green
- Department of Clinical Infection, Microbiology and Immunology, Institute of Infection, Veterinary and Ecological Sciences, University of Liverpool, Liverpool, United Kingdom
| | - Deborah Howarth
- Department of Clinical Infection, Microbiology and Immunology, Institute of Infection, Veterinary and Ecological Sciences, University of Liverpool, Liverpool, United Kingdom
| | - Chrispin Chaguza
- Parasites and Microbes Programme, Wellcome Sanger Institute, Wellcome Genome Campus, Cambridge, United Kingdom
| | - Haley Echlin
- Department of Infectious Disease, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - R Frèdi Langendonk
- Department of Clinical Infection, Microbiology and Immunology, Institute of Infection, Veterinary and Ecological Sciences, University of Liverpool, Liverpool, United Kingdom
| | - Connor Munro
- Department of Clinical Infection, Microbiology and Immunology, Institute of Infection, Veterinary and Ecological Sciences, University of Liverpool, Liverpool, United Kingdom
| | - Thomas E Barton
- Department of Clinical Infection, Microbiology and Immunology, Institute of Infection, Veterinary and Ecological Sciences, University of Liverpool, Liverpool, United Kingdom
| | - Jay C D Hinton
- Department of Clinical Infection, Microbiology and Immunology, Institute of Infection, Veterinary and Ecological Sciences, University of Liverpool, Liverpool, United Kingdom
| | - Stephen D Bentley
- Parasites and Microbes Programme, Wellcome Sanger Institute, Wellcome Genome Campus, Cambridge, United Kingdom
| | - Jason W Rosch
- Department of Infectious Disease, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Daniel R Neill
- Department of Clinical Infection, Microbiology and Immunology, Institute of Infection, Veterinary and Ecological Sciences, University of Liverpool, Liverpool, United Kingdom
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19
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Suwankitwat N, Libby S, Liggitt HD, Avalos A, Ruddell A, Rosch JW, Park H, Iritani BM. The actin-regulatory protein Hem-1 is essential for alveolar macrophage development. J Exp Med 2021; 218:211806. [PMID: 33600594 PMCID: PMC7894047 DOI: 10.1084/jem.20200472] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Revised: 09/16/2020] [Accepted: 01/13/2021] [Indexed: 01/27/2023] Open
Abstract
Hematopoietic protein-1 (Hem-1) is a hematopoietic cell–specific actin-regulatory protein. Loss-of-function (LOF) variants in the NCKAP1L gene encoding Hem-1 have recently been found to result in primary immunodeficiency disease (PID) in humans, characterized by recurring respiratory infections, asthma, and high mortality. However, the mechanisms of how Hem-1 variants result in PID are not known. In this study, we generated constitutive and myeloid cell–specific Nckap1l-KO mice to dissect the importance of Hem-1 in lung immunity. We found that Hem-1–deficient mice accumulated excessive surfactant and cell debris in airways (pulmonary alveolar proteinosis) due to impaired development of alveolar macrophages (AMs) and reduced expression of the AM differentiation factor Pparg. Residual Hem-1–deficient AMs shifted to a proinflammatory phenotype, and Hem-1–deficient neutrophils and monocytes failed to migrate normally. Myeloid cell–specific Hem-1–deficient mice exhibited increased morbidity following influenza A virus or Streptococcus pneumoniae challenge. These results provide potential mechanisms for how LOF variants in Hem-1 result in recurring respiratory diseases.
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Affiliation(s)
| | - Stephen Libby
- Department of Microbiology, University of Washington, Seattle, WA
| | - H Denny Liggitt
- Department of Comparative Medicine, University of Washington, Seattle, WA
| | - Alan Avalos
- Department of Comparative Medicine, University of Washington, Seattle, WA
| | - Alanna Ruddell
- Department of Comparative Medicine, University of Washington, Seattle, WA
| | - Jason W Rosch
- Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, TN
| | - Heon Park
- Department of Comparative Medicine, University of Washington, Seattle, WA
| | - Brian M Iritani
- Department of Comparative Medicine, University of Washington, Seattle, WA
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20
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Neville SL, Eijkelkamp BA, Lothian A, Paton JC, Roberts BR, Rosch JW, McDevitt CA. Cadmium stress dictates central carbon flux and alters membrane composition in Streptococcus pneumoniae. Commun Biol 2020; 3:694. [PMID: 33214631 PMCID: PMC7678824 DOI: 10.1038/s42003-020-01417-y] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2019] [Accepted: 10/23/2020] [Indexed: 12/12/2022] Open
Abstract
Metal ion homeostasis is essential for all forms of life. However, the breadth of intracellular impacts that arise upon dysregulation of metal ion homeostasis remain to be elucidated. Here, we used cadmium, a non-physiological metal ion, to investigate how the bacterial pathogen, Streptococcus pneumoniae, resists metal ion stress and dyshomeostasis. By combining transcriptomics, metabolomics and metalloproteomics, we reveal that cadmium stress dysregulates numerous essential cellular pathways including central carbon metabolism, lipid membrane biogenesis and homeostasis, and capsule production at the transcriptional and/or functional level. Despite the breadth of cellular pathways susceptible to metal intoxication, we show that S. pneumoniae is able to maintain viability by utilizing cellular pathways that are predominately metal-independent, such as the pentose phosphate pathway to maintain energy production. Collectively, this work provides insight into the cellular processes impacted by cadmium and how resistance to metal ion toxicity is achieved in S. pneumoniae. Neville et al. investigate how Streptococcus pneumoniae mitigates metal ion stress. Despite cadmium induced dysregulation of central carbon metabolism and lipid membrane homeostasis, they find that S. pneumoniae can remain viable by selectively utilizing predominately metal-independent cellular pathways. This study provides insights into how bacteria overcome metal ion toxicity.
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Affiliation(s)
- Stephanie L Neville
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, The University of Melbourne, Melbourne, VIC, Australia.
| | - Bart A Eijkelkamp
- College of Science and Engineering, Flinders University, Bedford Park, SA, Australia
| | - Amber Lothian
- Melbourne Dementia Research Centre, The Florey Institute of Neuroscience and Mental Health, The University of Melbourne, Parkville, VIC, Australia
| | - James C Paton
- Research Centre for Infectious Diseases, Department of Molecular and Biomedical Science, University of Adelaide, Adelaide, SA, Australia
| | - Blaine R Roberts
- Melbourne Dementia Research Centre, The Florey Institute of Neuroscience and Mental Health, The University of Melbourne, Parkville, VIC, Australia.,Department of Biochemistry, Emory University School of Medicine, Atlanta, GA, 30322, USA
| | - Jason W Rosch
- Department of Infectious Diseases, St Jude Children's Research Hospital, Memphis, TN, USA
| | - Christopher A McDevitt
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, The University of Melbourne, Melbourne, VIC, Australia.
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21
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Abstract
Streptococcus pneumoniae is the causative agent of a multitude of diseases, and further study into its pathogenies is vital. The pneumococcus is genetically malleable, and several tools are available to manipulate this pathogen. In this study, we attempted to utilize one such tool, the Sweet Janus cassette, to replace the capsule locus with other capsule loci in our strain background and found that the efficiency of allelic replacement was low and the number of revertant false-positive colonies was high. We determined that the capacity to recombine capsule varied by the initial isolated colony, suggesting that frequency of reversion is dependent on the bacterial clone. Alternative selection markers may further expand the application of Sweet Janus. We created novel cassettes that utilized chlorinated phenylalanine as an alternative counter-selection agent in conjunction with the Janus or Sweet Janus cassette, providing a new dual or triple selection marker. Moreover, we created cassettes that do not require engineered resistance in the background strain, including both single and dual selection markers. We were able to utilize all constructs in allelic replacement of the capsule loci. These novel constructs provide a new means for generating gene deletions in S. pneumoniae that expand experimental applications.
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22
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Abstract
Streptococcus pneumoniae is an opportunistic pathogen responsible for widespread illness and is a major global health issue for children, the elderly, and the immunocompromised population. Pneumolysin (PLY) is a cholesterol-dependent cytolysin (CDC) and key pneumococcal virulence factor involved in all phases of pneumococcal disease, including transmission, colonization, and infection. In this review we cover the biology and cytolytic function of PLY, its contribution to S. pneumoniae pathogenesis, and its known interactions and effects on the host with regard to tissue damage and immune response. Additionally, we review statins as a therapeutic option for CDC toxicity and PLY toxoid as a vaccine candidate in protein-based vaccines.
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Affiliation(s)
- Andrew T Nishimoto
- Department of Infectious Disease, St. Jude Children's Research Hospital, Memphis, TN, United States
| | - Jason W Rosch
- Department of Infectious Disease, St. Jude Children's Research Hospital, Memphis, TN, United States
| | - Elaine I Tuomanen
- Department of Infectious Disease, St. Jude Children's Research Hospital, Memphis, TN, United States
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23
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Echlin H, Frank M, Rock C, Rosch JW. Role of the pyruvate metabolic network on carbohydrate metabolism and virulence in Streptococcus pneumoniae. Mol Microbiol 2020; 114:536-552. [PMID: 32495474 DOI: 10.1111/mmi.14557] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2020] [Revised: 04/27/2020] [Accepted: 05/22/2020] [Indexed: 11/30/2022]
Abstract
Streptococcus pneumoniae is a major human pathogen that must adapt to unique nutritional environments in several host niches. The pneumococcus can metabolize a range of carbohydrates that feed into glycolysis ending in pyruvate, which is catabolized by several enzymes. We investigated how the pneumococcus utilizes these enzymes to metabolize different carbohydrates and how this impacts survival in the host. Loss of ldh decreased bacterial burden in the nasopharynx and enhanced bacteremia in mice. Loss of spxB, pdhC or pfl2 decreased bacteremia and increased host survival. In glucose or galactose, loss of ldh increased capsule production, whereas loss of spxB and pdhC reduced capsule production. The pfl2 mutant exhibited reduced capsule production only in galactose. In glucose, pyruvate was metabolized primarily by LDH to generate lactate and NAD+ and by SpxB and PDHc to generate acetyl-CoA. In galactose, pyruvate metabolism was shunted toward acetyl-CoA production. The majority of acetyl-CoA generated by PFL was used to regenerate NAD+ with a subset used in capsule production, while the acetyl-CoA generated by SpxB and PDHc was utilized primarily for capsule biosynthesis. These data suggest that the pneumococcus can alter flux of pyruvate metabolism dependent on the carbohydrate present to succeed in distinct host niches.
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Affiliation(s)
- Haley Echlin
- Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Matthew Frank
- Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Charles Rock
- Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Jason W Rosch
- Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, TN, USA
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24
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Frank MW, Yao J, Batte JL, Gullett JM, Subramanian C, Rosch JW, Rock CO. Host Fatty Acid Utilization by Staphylococcus aureus at the Infection Site. mBio 2020; 11:e00920-20. [PMID: 32430471 PMCID: PMC7240157 DOI: 10.1128/mbio.00920-20] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2020] [Accepted: 04/20/2020] [Indexed: 11/20/2022] Open
Abstract
Staphylococcus aureus utilizes the fatty acid (FA) kinase system to activate exogenous FAs for membrane synthesis. We developed a lipidomics workflow to determine the membrane phosphatidylglycerol (PG) molecular species synthesized by S. aureus at the thigh infection site. Wild-type S. aureus utilizes both host palmitate and oleate to acylate the 1 position of PG, and the 2 position is occupied by pentadecanoic acid arising from de novo biosynthesis. Inactivation of FakB2 eliminates the ability to assimilate oleate and inactivation of FakB1 reduces the content of saturated FAs and enhances oleate utilization. Elimination of FA activation in either ΔfakA or ΔfakB1 ΔfakB2 mutants does not impact growth. All S. aureus strains recovered from the thigh have significantly reduced branched-chain FAs and increased even-chain FAs compared to that with growth in rich laboratory medium. The molecular species pattern observed in the thigh was reproduced in the laboratory by growth in isoleucine-deficient medium containing exogenous FAs. S. aureus utilizes specific host FAs for membrane biosynthesis but also requires de novo FA biosynthesis initiated by isoleucine (or leucine) to produce pentadecanoic acid.IMPORTANCE The shortage of antibiotics against drug-resistant Staphylococcus aureus has led to the development of new drugs targeting the elongation cycle of fatty acid (FA) synthesis that are progressing toward the clinic. An objection to the use of FA synthesis inhibitors is that S. aureus can utilize exogenous FAs to construct its membrane, suggesting that the bacterium would bypass these therapeutics by utilizing host FAs instead. We developed a mass spectrometry workflow to determine the composition of the S. aureus membrane at the infection site to directly address how S. aureus uses host FAs. S. aureus strains that cannot acquire host FAs are as effective in establishing an infection as the wild type, but strains that require the utilization of host FAs for growth were attenuated in the mouse thigh infection model. We find that S. aureus does utilize host FAs to construct its membrane, but host FAs do not replace the requirement for pentadecanoic acid, a branched-chain FA derived from isoleucine (or leucine) that predominantly occupies the 2 position of S. aureus phospholipids. The membrane phospholipid structure of S. aureus mutants that cannot utilize host FAs indicates the isoleucine is a scarce resource at the infection site. This reliance on the de novo synthesis of predominantly pentadecanoic acid that cannot be obtained from the host is one reason why drugs that target fatty acid synthesis are effective in treating S. aureus infections.
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Affiliation(s)
- Matthew W Frank
- Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - Jiangwei Yao
- Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - Justin L Batte
- Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - Jessica M Gullett
- Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - Chitra Subramanian
- Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - Jason W Rosch
- Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - Charles O Rock
- Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
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25
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Cooper VS, Honsa E, Rowe H, Deitrick C, Iverson AR, Whittall JJ, Neville SL, McDevitt CA, Kietzman C, Rosch JW. Experimental Evolution In Vivo To Identify Selective Pressures during Pneumococcal Colonization. mSystems 2020; 5:e00352-20. [PMID: 32398278 PMCID: PMC7219553 DOI: 10.1128/msystems.00352-20] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2020] [Accepted: 04/30/2020] [Indexed: 12/20/2022] Open
Abstract
Experimental evolution is a powerful technique to understand how populations evolve from selective pressures imparted by the surrounding environment. With the advancement of whole-population genomic sequencing, it is possible to identify and track multiple contending genotypes associated with adaptations to specific selective pressures. This approach has been used repeatedly with model species in vitro, but only rarely in vivo Herein we report results of replicate experimentally evolved populations of Streptococcus pneumoniae propagated by repeated murine nasal colonization with the aim of identifying gene products under strong selection as well as the population genetic dynamics of infection cycles. Frameshift mutations in one gene, dltB, responsible for incorporation of d-alanine into teichoic acids on the bacterial surface, evolved repeatedly and swept to high frequency. Targeted deletions of dltB produced a fitness advantage during initial nasal colonization coupled with a corresponding fitness disadvantage in the lungs during pulmonary infection. The underlying mechanism behind the fitness trade-off between these two niches was found to be enhanced adherence to respiratory cells balanced by increased sensitivity to host-derived antimicrobial peptides, a finding recapitulated in the murine model. Additional mutations that are predicted to affect trace metal transport, central metabolism, and regulation of biofilm production and competence were also selected. These data indicate that experimental evolution can be applied to murine models of pathogenesis to gain insight into organism-specific tissue tropisms.IMPORTANCE Evolution is a powerful force that can be experimentally harnessed to gain insight into how populations evolve in response to selective pressures. Herein we tested the applicability of experimental evolutionary approaches to gain insight into how the major human pathogen Streptococcus pneumoniae responds to repeated colonization events using a murine model. These studies revealed the population dynamics of repeated colonization events and demonstrated that in vivo experimental evolution resulted in highly reproducible trajectories that reflect the environmental niche encountered during nasal colonization. Mutations impacting the surface charge of the bacteria were repeatedly selected during colonization and provided a fitness benefit in this niche that was counterbalanced by a corresponding fitness defect during lung infection. These data indicate that experimental evolution can be applied to models of pathogenesis to gain insight into organism-specific tissue tropisms.
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Affiliation(s)
- Vaughn S Cooper
- Department of Microbiology and Molecular Genetics, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
- Center for Evolutionary Biology and Medicine, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
| | - Erin Honsa
- St. Jude Children's Research Hospital, Department of Infectious Diseases, Memphis, Tennessee, USA
| | - Hannah Rowe
- St. Jude Children's Research Hospital, Department of Infectious Diseases, Memphis, Tennessee, USA
| | - Christopher Deitrick
- Department of Microbiology and Molecular Genetics, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
- Center for Evolutionary Biology and Medicine, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
| | - Amy R Iverson
- St. Jude Children's Research Hospital, Department of Infectious Diseases, Memphis, Tennessee, USA
| | - Jonathan J Whittall
- Department of Molecular and Biomedical Science, School of Biological Sciences, University of Adelaide, Adelaide, South Australia, Australia
| | - Stephanie L Neville
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, The University of Melbourne, Melbourne, Victoria, Australia
| | - Christopher A McDevitt
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, The University of Melbourne, Melbourne, Victoria, Australia
| | - Colin Kietzman
- St. Jude Children's Research Hospital, Department of Infectious Diseases, Memphis, Tennessee, USA
| | - Jason W Rosch
- St. Jude Children's Research Hospital, Department of Infectious Diseases, Memphis, Tennessee, USA
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26
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Cortez V, Boyd DF, Crawford JC, Sharp B, Livingston B, Rowe HM, Davis A, Alsallaq R, Robinson CG, Vogel P, Rosch JW, Margolis E, Thomas PG, Schultz-Cherry S. Astrovirus infects actively secreting goblet cells and alters the gut mucus barrier. Nat Commun 2020; 11:2097. [PMID: 32350281 PMCID: PMC7190700 DOI: 10.1038/s41467-020-15999-y] [Citation(s) in RCA: 48] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2019] [Accepted: 04/08/2020] [Indexed: 12/18/2022] Open
Abstract
Astroviruses are a global cause of pediatric diarrhea, but they are largely understudied, and it is unclear how and where they replicate in the gut. Using an in vivo model, here we report that murine astrovirus preferentially infects actively secreting small intestinal goblet cells, specialized epithelial cells that maintain the mucus barrier. Consequently, virus infection alters mucus production, leading to an increase in mucus-associated bacteria and resistance to enteropathogenic E. coli colonization. These studies establish the main target cell type and region of the gut for productive murine astrovirus infection. They further define a mechanism by which an enteric virus can regulate the mucus barrier, induce functional changes to commensal microbial communities, and alter host susceptibility to pathogenic bacteria.
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Affiliation(s)
- Valerie Cortez
- Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - David F Boyd
- Department of Immunology, St. Jude Children's Research Hospital, Memphis, TN, USA
| | | | - Bridgett Sharp
- Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Brandi Livingston
- Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Hannah M Rowe
- Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Amy Davis
- Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Ramzi Alsallaq
- Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Camenzind G Robinson
- Cell and Tissue Imaging Center, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Peter Vogel
- Veterinary Pathology Core, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Jason W Rosch
- Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Elisa Margolis
- Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Paul G Thomas
- Department of Immunology, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Stacey Schultz-Cherry
- Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, TN, USA.
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27
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Samarasinghe AE, Rosch JW. Convergence of Inflammatory Pathways in Allergic Asthma and Sickle Cell Disease. Front Immunol 2020; 10:3058. [PMID: 32038616 PMCID: PMC6992560 DOI: 10.3389/fimmu.2019.03058] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2019] [Accepted: 12/16/2019] [Indexed: 01/19/2023] Open
Abstract
The underlying pathologies of sickle cell disease and asthma share many characteristics in terms of respiratory inflammation. The principal mechanisms of pulmonary inflammation are largely distinct, but activation of common pathways downstream of the initial inflammatory triggers may lead to exacerbation of both disease states. The altered inflammatory landscape of these respiratory pathologies can differentially impact respiratory pathogen susceptibility in patients with sickle cell disease and asthma. How these two distinct diseases behave in a comorbid setting can further exacerbate pulmonary complications associated with both disease states and impact susceptibility to respiratory infection. This review will provide a concise overview of how asthma distinctly affects individuals with sickle cell disease and how pulmonary physiology and inflammation are impacted during comorbidity.
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Affiliation(s)
- Amali E Samarasinghe
- Division of Pulmonology, Allergy-Immunology, and Sleep, Department of Pediatrics, College of Medicine, University of Tennessee Health Science Center, Memphis, TN, United States.,Department of Microbiology Immunology and Biochemistry, College of Medicine, University of Tennessee Health Science Center, Memphis, TN, United States.,Children's Foundation Research Institute, Memphis, TN, United States
| | - Jason W Rosch
- Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, TN, United States
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LeMessurier KS, Iverson AR, Chang TC, Palipane M, Vogel P, Rosch JW, Samarasinghe AE. Allergic inflammation alters the lung microbiome and hinders synergistic co-infection with H1N1 influenza virus and Streptococcus pneumoniae in C57BL/6 mice. Sci Rep 2019; 9:19360. [PMID: 31852944 PMCID: PMC6920369 DOI: 10.1038/s41598-019-55712-8] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2019] [Accepted: 11/28/2019] [Indexed: 12/12/2022] Open
Abstract
Asthma is a chronic airways condition that can be exacerbated during respiratory infections. Our previous work, together with epidemiologic findings that asthmatics were less likely to suffer from severe influenza during the 2009 pandemic, suggest that additional complications of influenza such as increased susceptibility to bacterial superinfection, may be mitigated in allergic hosts. To test this hypothesis, we developed a murine model of 'triple-disease' in which mice rendered allergic to Aspergillus fumigatus were co-infected with influenza A virus and Streptococcus pneumoniae seven days apart. Significant alterations to known synergistic effects of co-infection were noted in the allergic mice including reduced morbidity and mortality, bacterial burden, maintenance of alveolar macrophages, and reduced lung inflammation and damage. The lung microbiome of allergic mice differed from that of non-allergic mice during co-infection and antibiotic-induced perturbation to the microbiome rendered allergic animals susceptible to severe morbidity. Our data suggest that responses to co-infection in allergic hosts likely depends on the immune and microbiome states and that antibiotics should be used with caution in individuals with underlying chronic lung disease.
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Affiliation(s)
- Kim S LeMessurier
- Department of Paediatrics, College of Medicine, University of Tennessee Health Science Center, Memphis, TN, 38103, USA
- Children's Foundation Research Institute, Memphis, TN, 38103, USA
| | - Amy R Iverson
- Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, TN, 38105, USA
| | - Ti-Cheng Chang
- Center for Applied Bioinformatics, St. Jude Children's Research Hospital, Memphis, TN, 38105, USA
| | - Maneesha Palipane
- Department of Paediatrics, College of Medicine, University of Tennessee Health Science Center, Memphis, TN, 38103, USA
- Children's Foundation Research Institute, Memphis, TN, 38103, USA
| | - Peter Vogel
- Department of Veterinary Pathology at St. Jude Children's Research Hospital, Memphis, TN, 38105, USA
| | - Jason W Rosch
- Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, TN, 38105, USA
| | - Amali E Samarasinghe
- Department of Paediatrics, College of Medicine, University of Tennessee Health Science Center, Memphis, TN, 38103, USA.
- Children's Foundation Research Institute, Memphis, TN, 38103, USA.
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Abstract
The synergies between viral and bacterial infections are well established. Most studies have been focused on the indirect mechanisms underlying this phenomenon, including immune modulation and alterations to the mucosal structures that promote pathogen outgrowth. A growing body of evidence implicates direct binding of virus to bacterial surfaces being an additional mechanism of synergy at the host-pathogen interface. These cross-kingdom interactions enhance bacterial and viral adhesion and can alter tissue tropism. These bacterial-viral complexes play unique roles in pathogenesis and can alter virulence potential. The bacterial-viral complexes may also play important roles in pathogen transmission. Additionally, the complexes are recognized by the host immune system in a distinct manner, thus presenting novel routes for vaccine development. These synergies are active for multiple species in both the respiratory and gastrointestinal tract, indicating that direct interactions between bacteria and virus to modulate host interactions are used by a diverse array of species.
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Affiliation(s)
- Hannah M Rowe
- Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, TN, 38105, USA
| | - Jason W Rosch
- Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, TN, 38105, USA
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30
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Hakim H, Dallas R, Wolf J, Tang L, Schultz-Cherry S, Darling V, Johnson C, Karlsson EA, Chang TC, Jeha S, Pui CH, Sun Y, Pounds S, Hayden RT, Tuomanen E, Rosch JW. Gut Microbiome Composition Predicts Infection Risk During Chemotherapy in Children With Acute Lymphoblastic Leukemia. Clin Infect Dis 2019. [PMID: 29518185 DOI: 10.1093/cid/ciy153] [Citation(s) in RCA: 103] [Impact Index Per Article: 20.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Background Myelosuppression-related infections remain important causes of morbidity and mortality in children with acute lymphoblastic leukemia (ALL). Methods By analyzing fecal samples collected at diagnosis and after each of the initial 3 phases of chemotherapy, we evaluated the role of gut microbiota in predicting infections in 199 children with newly diagnosed ALL. The bacterial 16S rRNA gene was analyzed by high-depth sequencing to determine the diversity and composition of the microbiome. Results After the induction and reinduction I phases of chemotherapy, microbial diversity decreased significantly relative to the prechemotherapy value. After chemotherapy, the relative abundance of certain bacterial taxa (eg, Bacteroidetes) decreased significantly, whereas that of other taxa (eg, Clostridiaceae and Streptococcaceae) increased. A baseline gut microbiome characterized by Proteobacteria predicted febrile neutropenia. Adjusting for the chemotherapy phase and ALL risk level, Enterococcaceae dominance (relative abundance ≥30%) predicted significantly greater risk of subsequent febrile neutropenia and diarrheal illness, whereas Streptococcaceae dominance predicted significantly greater risk of subsequent diarrheal illness. Conclusions In children undergoing therapy for newly diagnosed ALL, the relative abundance of Proteobacteria before chemotherapy initiation predicts development of febrile neutropenia, and domination of the gut microbiota by Enterococcaceae or Streptococcaceae at any time during chemotherapy predicts infection in subsequent phases of chemotherapy. Clinical Trial Registration NCT00549848.
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Affiliation(s)
- Hana Hakim
- Department of Infectious Diseases, St Jude Children's Research Hospital, Memphis, Tennessee
| | - Ronald Dallas
- Department of Infectious Diseases, St Jude Children's Research Hospital, Memphis, Tennessee
| | - Joshua Wolf
- Department of Infectious Diseases, St Jude Children's Research Hospital, Memphis, Tennessee
| | - Li Tang
- Department of Biostatistics, St Jude Children's Research Hospital, Memphis, Tennessee
| | - Stacey Schultz-Cherry
- Department of Infectious Diseases, St Jude Children's Research Hospital, Memphis, Tennessee
| | - Victoria Darling
- Department of Infectious Diseases, St Jude Children's Research Hospital, Memphis, Tennessee
| | - Cydney Johnson
- Department of Infectious Diseases, St Jude Children's Research Hospital, Memphis, Tennessee
| | - Erik A Karlsson
- Department of Infectious Diseases, St Jude Children's Research Hospital, Memphis, Tennessee
| | - Ti-Cheng Chang
- Department of Computational Biology, St Jude Children's Research Hospital, Memphis, Tennessee
| | - Sima Jeha
- Department of Oncology, St Jude Children's Research Hospital, Memphis, Tennessee
| | - Ching-Hon Pui
- Department of Oncology, St Jude Children's Research Hospital, Memphis, Tennessee
| | - Yilun Sun
- Department of Biostatistics, St Jude Children's Research Hospital, Memphis, Tennessee
| | - Stanley Pounds
- Department of Biostatistics, St Jude Children's Research Hospital, Memphis, Tennessee
| | - Randall T Hayden
- Department of Pathology, St Jude Children's Research Hospital, Memphis, Tennessee
| | - Elaine Tuomanen
- Department of Infectious Diseases, St Jude Children's Research Hospital, Memphis, Tennessee
| | - Jason W Rosch
- Department of Infectious Diseases, St Jude Children's Research Hospital, Memphis, Tennessee
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31
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Burcham ZM, Cowick CA, Baugher CN, Pechal JL, Schmidt CJ, Rosch JW, Benbow ME, Jordan HR. Total RNA Analysis of Bacterial Community Structural and Functional Shifts Throughout Vertebrate Decomposition. J Forensic Sci 2019; 64:1707-1719. [DOI: 10.1111/1556-4029.14083] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2019] [Revised: 04/10/2019] [Accepted: 04/25/2019] [Indexed: 01/09/2023]
Affiliation(s)
- Zachary M. Burcham
- Department of Biological Sciences Mississippi State University PO Box GY Mississippi State MS 39762
| | - Caitlyn A. Cowick
- Department of Biological Sciences Mississippi State University PO Box GY Mississippi State MS 39762
| | - Courtney N. Baugher
- Department of Biological Sciences Mississippi State University PO Box GY Mississippi State MS 39762
| | - Jennifer L. Pechal
- Department of Entomology Michigan State University 288 Farm Ln #243 East Lansing MI 48824
| | - Carl J. Schmidt
- Department of Pathology University of Michigan Medical Science Unit I, 1301 Catherine St Ann Arbor MI 48109
| | - Jason W. Rosch
- Department of Infectious Disease St. Jude Children's Research Hospital 262 Danny Thomas Place Memphis TN 38105
| | - M. Eric Benbow
- Department of Entomology Michigan State University 288 Farm Ln #243 East Lansing MI 48824
- Department of Osteopathic Medical Specialties Michigan State University West Fee Hall, 909 Fee Road East Lansing MI 48824
| | - Heather R. Jordan
- Department of Biological Sciences Mississippi State University PO Box GY Mississippi State MS 39762
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32
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Rowe HM, Karlsson E, Echlin H, Chang TC, Wang L, van Opijnen T, Pounds SB, Schultz-Cherry S, Rosch JW. Bacterial Factors Required for Transmission of Streptococcus pneumoniae in Mammalian Hosts. Cell Host Microbe 2019; 25:884-891.e6. [PMID: 31126758 DOI: 10.1016/j.chom.2019.04.012] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2018] [Revised: 02/18/2019] [Accepted: 04/02/2019] [Indexed: 02/06/2023]
Abstract
The capacity of Streptococcus pneumoniae to successfully transmit and colonize new human hosts is a critical aspect of pneumococcal population biology and a prerequisite for invasive disease. However, the bacterial mechanisms underlying this process remain largely unknown. To identify bacterial factors required for transmission, we conducted a high-throughput genetic screen with a transposon sequencing (Tn-seq) library of a pneumococcal strain in a ferret transmission model. Key players in both metabolism and transcriptional regulation were identified as required for efficient bacterial transmission. Targeted deletion of the putative C3-degrading protease CppA, iron transporter PiaA, or competence regulatory histidine kinase ComD significantly decreased transmissibility in a mouse model, further validating the screen. Maternal vaccination with recombinant surface-exposed PiaA and CppA alone or in combination blocked transmission in offspring and were more effective than capsule-based vaccines. These data underscore the possibility of targeting pneumococcal transmission as a means of eliminating invasive disease in the population.
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Affiliation(s)
- Hannah M Rowe
- Department of Infectious Diseases, St Jude Children's Research Hospital, Memphis, TN, USA
| | - Erik Karlsson
- Department of Infectious Diseases, St Jude Children's Research Hospital, Memphis, TN, USA
| | - Haley Echlin
- Department of Infectious Diseases, St Jude Children's Research Hospital, Memphis, TN, USA
| | - Ti-Cheng Chang
- Department of Computational Biology, St Jude Children's Research Hospital, Memphis, TN, USA
| | - Lei Wang
- Department of Biostatistics, St Jude Children's Research Hospital, Memphis, TN, USA
| | | | - Stanley B Pounds
- Department of Biostatistics, St Jude Children's Research Hospital, Memphis, TN, USA
| | - Stacey Schultz-Cherry
- Department of Infectious Diseases, St Jude Children's Research Hospital, Memphis, TN, USA
| | - Jason W Rosch
- Department of Infectious Diseases, St Jude Children's Research Hospital, Memphis, TN, USA.
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33
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Burcham ZM, Pechal JL, Schmidt CJ, Bose JL, Rosch JW, Benbow ME, Jordan HR. Bacterial Community Succession, Transmigration, and Differential Gene Transcription in a Controlled Vertebrate Decomposition Model. Front Microbiol 2019; 10:745. [PMID: 31057499 PMCID: PMC6482229 DOI: 10.3389/fmicb.2019.00745] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2018] [Accepted: 03/25/2019] [Indexed: 01/26/2023] Open
Abstract
Decomposing remains are a nutrient-rich ecosystem undergoing constant change due to cell breakdown and abiotic fluxes, such as pH level and oxygen availability. These environmental fluxes affect bacterial communities who respond in a predictive manner associated with the time since organismal death, or the postmortem interval (PMI). Profiles of microbial taxonomic turnover and transmigration are currently being studied in decomposition ecology, and in the field of forensic microbiology as indicators of the PMI. We monitored bacterial community structural and functional changes taking place during decomposition of the intestines, bone marrow, lungs, and heart in a highly controlled murine model. We found that organs presumed to be sterile during life are colonized by Clostridium during later decomposition as the fluids from internal organs begin to emulsify within the body cavity. During colonization of previously sterile sites, gene transcripts for multiple metabolism pathways were highly abundant, while transcripts associated with stress response and dormancy increased as decomposition progressed. We found our model strengthens known bacterial taxonomic succession data after host death. This study is one of the first to provide data of expressed bacterial community genes, alongside transmigration and structural changes of microbial species during laboratory controlled vertebrate decomposition. This is an important dataset for studying the effects of the environment on bacterial communities in an effort to determine which bacterial species and which bacterial functional pathways, such as amino acid metabolism, provide key changes during stages of decomposition that relate to the PMI. Finding unique PMI species or functions can be useful for determining time since death in forensic investigations.
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Affiliation(s)
- Zachary M Burcham
- Department of Biological Sciences, Mississippi State University, Starkville, MS, United States
| | - Jennifer L Pechal
- Department of Entomology, Michigan State University, East Lansing, MI, United States
| | - Carl J Schmidt
- Department of Pathology, University of Michigan, Ann Arbor, MI, United States
| | - Jeffrey L Bose
- Department of Microbiology, Molecular Genetics, and Immunology, University of Kansas Medical Center, Kansas City, KS, United States
| | - Jason W Rosch
- Department of Infectious Disease, St. Jude Children's Research Hospital, Memphis, TN, United States
| | - M Eric Benbow
- Department of Entomology, Michigan State University, East Lansing, MI, United States.,Department of Osteopathic Medical Specialties, Michigan State University, East Lansing, MI, United States
| | - Heather R Jordan
- Department of Biological Sciences, Mississippi State University, Starkville, MS, United States
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34
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Burcham ZM, Schmidt CJ, Pechal JL, Brooks CP, Rosch JW, Benbow ME, Jordan HR. Detection of critical antibiotic resistance genes through routine microbiome surveillance. PLoS One 2019; 14:e0213280. [PMID: 30870464 PMCID: PMC6417727 DOI: 10.1371/journal.pone.0213280] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2018] [Accepted: 02/18/2019] [Indexed: 12/29/2022] Open
Abstract
Population-based public health data on antibiotic resistance gene carriage is poorly surveyed. Research of the human microbiome as an antibiotic resistance reservoir has primarily focused on gut associated microbial communities, but data have shown more widespread microbial colonization across organs than originally believed, with organs previously considered as sterile being colonized. Our study demonstrates the utility of postmortem microbiome sampling during routine autopsy as a method to survey antibiotic resistance carriage in a general population. Postmortem microbial sampling detected pathogens of public health concern including genes for multidrug efflux pumps, carbapenem, methicillin, vancomycin, and polymixin resistances. Results suggest that postmortem assessments of host-associated microbial communities are useful in acquiring community specific data while reducing selective-participant biases.
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Affiliation(s)
- Zachary M. Burcham
- Department of Biological Sciences, Mississippi State University, Starkville, MS, United States of America
| | - Carl J. Schmidt
- Department of Pathology, University of Michigan, Ann Arbor, MI, United States of America
| | - Jennifer L. Pechal
- Department of Entomology, Michigan State University, East Lansing, MI, United States of America
| | - Christopher P. Brooks
- Department of Biological Sciences, Mississippi State University, Starkville, MS, United States of America
| | - Jason W. Rosch
- Department of Infectious Disease, St. Jude Children’s Research Hospital, Memphis, TN, United States of America
| | - M. Eric Benbow
- Department of Entomology, Michigan State University, East Lansing, MI, United States of America
- Department of Osteopathic Medical Specialties, Michigan State University, East Lansing, MI, United States of America
| | - Heather R. Jordan
- Department of Biological Sciences, Mississippi State University, Starkville, MS, United States of America
- * E-mail:
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35
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Abstract
Antibiotic resistance can come at a high cost, both in terms of fitness for the pathogen and poorer outcomes for patients. The fitness landscape encountered by bacterial pathogens varies greatly throughout patient populations in terms of host immunity as well as the duration and spectrum of antibiotics encountered. Severely immunocompromised patients present a favorable environment for antibiotic resistance to emerge due to lack of immune-mediated competition and increased opportunities to evolve both on-target and compensatory mutations. Such patients may present unique pathways for antibiotic resistance to emerge.
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Affiliation(s)
- Elisa Margolis
- Department of Infectious Diseases, St. Jude Children’s Research Hospital, 262 Danny Thomas Place, Memphis, Tennessee 38105, United States
| | - Jason W. Rosch
- Department of Infectious Diseases, St. Jude Children’s Research Hospital, 262 Danny Thomas Place, Memphis, Tennessee 38105, United States
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Karlsson EA, Schultz-Cherry S, Rosch JW. Protective Capacity of Statins during Pneumonia Is Dependent on Etiological Agent and Obesity. Front Cell Infect Microbiol 2018; 8:41. [PMID: 29497602 PMCID: PMC5819214 DOI: 10.3389/fcimb.2018.00041] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2017] [Accepted: 01/31/2018] [Indexed: 01/14/2023] Open
Abstract
Acute respiratory infections are a leading cause of death worldwide. Clinical data is conflicted regarding whether statins improve outcomes for pneumonia. Potential confounding factors including specific etiology of pneumonia as well as obesity could potentially mask protective benefit. Obesity is a risk factor for high cholesterol, the main target for statin therapy. We demonstrate that statin intervention conferred no protective benefit in the context of wild-type mice regardless of infectious agent. Statin intervention conferred either a protective benefit, during influenza infection, or detrimental effect, in the case of pneumococcal infection, in obese animals. These data suggest etiology of pneumonia in the context of obesity could be dramatically altered by the protective effects of statin therapy during bacterial and viral pneumonia.
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Affiliation(s)
- Erik A Karlsson
- Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, TN, United States
| | - Stacey Schultz-Cherry
- Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, TN, United States
| | - Jason W Rosch
- Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, TN, United States
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Penkert RR, Iverson A, Rosch JW, Hurwitz JL. Prevnar-13 vaccine failure in a mouse model for vitamin A deficiency. Vaccine 2017; 35:6264-6268. [PMID: 29032897 DOI: 10.1016/j.vaccine.2017.09.069] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2017] [Revised: 09/21/2017] [Accepted: 09/23/2017] [Indexed: 02/09/2023]
Abstract
Streptococcus pneumoniae (pneumococcus) is responsible for serious pediatric respiratory infections, and kills close to one million children under the age of five each year. Unfortunately, the Prevnar-13 vaccine (PCV-13) that is used to protect children from the serious consequences of pneumococcus infections is not always successful. Given that vitamin A deficiency (VAD) is known to affect children in both developed and developing countries, we asked if VAD could be responsible, at least in part, for PCV-13 vaccine failures. In a mouse model for VAD, we found that PCV-13 failed to elicit binding and neutralizing antibody activities. Unlike vaccinated, vitamin-replete animals, vaccinated VAD animals were not protected from lethal pneumococcus infections. Results suggest that children with VAD may be susceptible to serious pneumococcal infections even after having received the PCV-13 vaccine.
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Affiliation(s)
- Rhiannon R Penkert
- Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - Amy Iverson
- Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - Jason W Rosch
- Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, TN 38105, USA; Department of Microbiology, Immunology and Biochemistry, University of Tennessee Health Science Center, Memphis, TN 38163, USA
| | - Julia L Hurwitz
- Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, TN 38105, USA; Department of Microbiology, Immunology and Biochemistry, University of Tennessee Health Science Center, Memphis, TN 38163, USA.
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Brown LR, Caulkins RC, Schartel TE, Rosch JW, Honsa ES, Schultz-Cherry S, Meliopoulos VA, Cherry S, Thornton JA. Increased Zinc Availability Enhances Initial Aggregation and Biofilm Formation of Streptococcus pneumoniae. Front Cell Infect Microbiol 2017. [PMID: 28638805 PMCID: PMC5461340 DOI: 10.3389/fcimb.2017.00233] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Bacteria growing within biofilms are protected from antibiotics and the immune system. Within these structures, horizontal transfer of genes encoding virulence factors, and promoting antibiotic resistance occurs, making biofilms an extremely important aspect of pneumococcal colonization and persistence. Identifying environmental cues that contribute to the formation of biofilms is critical to understanding pneumococcal colonization and infection. Iron has been shown to be essential for the formation of pneumococcal biofilms; however, the role of other physiologically important metals such as copper, zinc, and manganese has been largely neglected. In this study, we investigated the effect of metals on pneumococcal aggregation and early biofilm formation. Our results show that biofilms increase as zinc concentrations increase. The effect was found to be zinc-specific, as altering copper and manganese concentrations did not affect biofilm formation. Scanning electron microscopy analysis revealed structural differences between biofilms grown in varying concentrations of zinc. Analysis of biofilm formation in a mutant strain lacking the peroxide-generating enzyme pyruvate oxidase, SpxB, revealed that zinc does not protect against pneumococcal H2O2. Further, analysis of a mutant strain lacking the major autolysin, LytA, indicated the role of zinc as a negative regulator of LytA-dependent autolysis, which could affect biofilm formation. Additionally, analysis of cell-cell aggregation via plating and microscopy revealed that high concentrations of zinc contribute to intercellular interaction of pneumococci. The findings from this study demonstrate that metal availability contributes to the ability of pneumococci to form aggregates and subsequently, biofilms.
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Affiliation(s)
- Lindsey R Brown
- Department of Biological Sciences, Mississippi State UniversityStarkville, MS, United States
| | - Rachel C Caulkins
- Department of Biological Sciences, Mississippi State UniversityStarkville, MS, United States
| | - Tyler E Schartel
- Department of Biological Sciences, Mississippi State UniversityStarkville, MS, United States
| | - Jason W Rosch
- Department of Infectious Diseases, St. Jude Children's Research HospitalMemphis, TN, United States
| | - Erin S Honsa
- Department of Infectious Diseases, St. Jude Children's Research HospitalMemphis, TN, United States
| | - Stacey Schultz-Cherry
- Department of Infectious Diseases, St. Jude Children's Research HospitalMemphis, TN, United States
| | - Victoria A Meliopoulos
- Department of Infectious Diseases, St. Jude Children's Research HospitalMemphis, TN, United States
| | - Sean Cherry
- Department of Infectious Diseases, St. Jude Children's Research HospitalMemphis, TN, United States
| | - Justin A Thornton
- Department of Biological Sciences, Mississippi State UniversityStarkville, MS, United States
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Bryant JC, Dabbs RC, Oswalt KL, Brown LR, Rosch JW, Seo KS, Donaldson JR, McDaniel LS, Thornton JA. Pyruvate oxidase of Streptococcus pneumoniae contributes to pneumolysin release. BMC Microbiol 2016; 16:271. [PMID: 27829373 PMCID: PMC5103497 DOI: 10.1186/s12866-016-0881-6] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2016] [Accepted: 10/28/2016] [Indexed: 11/21/2022] Open
Abstract
Background Streptococcus pneumoniae is one of the leading causes of community acquired pneumonia and acute otitis media. Certain aspects of S. pneumoniae’s virulence are dependent upon expression and release of the protein toxin pneumolysin (PLY) and upon the activity of the peroxide-producing enzyme, pyruvate oxidase (SpxB). We investigated the possible synergy of these two proteins and identified that release of PLY is enhanced by expression of SpxB prior to stationary phase growth. Results Mutants lacking the spxB gene were defective in PLY release and complementation of spxB restored PLY release. This was demonstrated by cytotoxic effects of sterile filtered supernatants upon epithelial cells and red blood cells. Additionally, peroxide production appeared to contribute to the mechanism of PLY release since a significant correlation was found between peroxide production and PLY release among a panel of clinical isolates. Exogenous addition of H2O2 failed to induce PLY release and catalase supplementation prevented PLY release in some strains, indicating peroxide may exert its effect intracellularly or in a strain-dependent manner. SpxB expression did not trigger bacterial cell death or LytA-dependent autolysis, but did predispose cells to deoxycholate lysis. Conclusions Here we demonstrate a novel link between spxB expression and PLY release. These findings link liberation of PLY toxin to oxygen availability and pneumococcal metabolism. Electronic supplementary material The online version of this article (doi:10.1186/s12866-016-0881-6) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Joseph C Bryant
- Department of Biological Sciences, Mississippi State University, 295 E Lee Blvd., Harned Hall, Rm 219, Mississippi State, MS, 39762, USA
| | - Ridge C Dabbs
- Department of Biological Sciences, Mississippi State University, 295 E Lee Blvd., Harned Hall, Rm 219, Mississippi State, MS, 39762, USA
| | - Katie L Oswalt
- Department of Biological Sciences, Mississippi State University, 295 E Lee Blvd., Harned Hall, Rm 219, Mississippi State, MS, 39762, USA
| | - Lindsey R Brown
- Department of Biological Sciences, Mississippi State University, 295 E Lee Blvd., Harned Hall, Rm 219, Mississippi State, MS, 39762, USA
| | - Jason W Rosch
- Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Keun S Seo
- Department of Basic Sciences, College of Veterinary Medicine, Mississippi State University, Mississippi State, MS, USA
| | - Janet R Donaldson
- Department of Biological Sciences, University of Southern Mississippi, Hattiesburg, MS, USA
| | - Larry S McDaniel
- Department of Microbiology and Immunology, University of Mississippi Medical Center, Jackson, MS, USA
| | - Justin A Thornton
- Department of Biological Sciences, Mississippi State University, 295 E Lee Blvd., Harned Hall, Rm 219, Mississippi State, MS, 39762, USA.
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Echlin H, Frank MW, Iverson A, Chang TC, Johnson MDL, Rock CO, Rosch JW. Pyruvate Oxidase as a Critical Link between Metabolism and Capsule Biosynthesis in Streptococcus pneumoniae. PLoS Pathog 2016; 12:e1005951. [PMID: 27760231 PMCID: PMC5070856 DOI: 10.1371/journal.ppat.1005951] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2016] [Accepted: 09/23/2016] [Indexed: 01/12/2023] Open
Abstract
The pneumococcus is one of the most prodigious producers of hydrogen peroxide amongst bacterial pathogens. Hydrogen peroxide production by the pneumococcus has been implicated in antibiotic synergism, competition between other bacterial colonizers of the nasopharynx, and damage to epithelial cells. However, the role during invasive disease has been less clear with mutants defective in hydrogen peroxide production demonstrating both attenuation and heightened invasive disease capacity depending upon strain and serotype background. This work resolves these conflicting observations by demonstrating that the main hydrogen peroxide producing enzyme of the pneumococcus, SpxB, is required for capsule formation in a strain dependent manner. Capsule production by strains harboring capsules with acetylated sugars was dependent upon the presence of spxB while capsule production in serotypes lacking such linkages were not. The spxB mutant had significantly lower steady-state cellular levels of acetyl-CoA, suggesting that loss of capsule arises from dysregulation of this intermediary metabolite. This conclusion is corroborated by deletion of pdhC, which also resulted in lower steady-state acetyl-CoA levels and phenocopied the capsule expression profile of the spxB mutant. Capsule and acetyl-CoA levels were restored in the spxB and lctO (lactate oxidase) double mutant, supporting the connection between central metabolism and capsule formation. Taken together, these data show that the defect in pathogenesis in the spxB mutant is due to a metabolic imbalance that attenuates capsule formation and not to reduced hydrogen peroxide formation. The pneumococcus polysaccharide capsule is one of the most critical virulence determinants produced by this major human pathogen. The pneumococcus also produces prodigious amounts of hydrogen peroxide via the enzymatic reaction catalyzed by pyruvate oxidase, SpxB. Deletion of spxB resulted in the loss of surface polysaccharide capsule production in a serotype dependent manner with a mirrored effect on the virulence of the mutants. We observed that deletion of spxB reduced the steady-state levels of acetyl-CoA, a key metabolic intermediate in peptidoglycan, fatty acid biosynthesis, and in capsule biosynthesis in a subset of serotypes. These data suggest that the defect in capsule production was due to altered metabolism that results in reduced acetyl-CoA availability. Corroborating these data, we found that capsule biosynthesis was impaired upon loss of PDHC, an additional metabolic enzyme that generates acetyl-CoA. These data reveal a critical link between pneumococcal metabolism and capsule biosynthesis as well as provide a striking example of how a virulence gene can have a differential contribution to pathogenesis dependent upon strain background.
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Affiliation(s)
- Haley Echlin
- Department of Infectious Diseases, St Jude Children’s Research Hospital, Memphis, Tennessee, United States of America
| | - Matthew W. Frank
- Department of Infectious Diseases, St Jude Children’s Research Hospital, Memphis, Tennessee, United States of America
| | - Amy Iverson
- Department of Infectious Diseases, St Jude Children’s Research Hospital, Memphis, Tennessee, United States of America
| | - Ti-Cheng Chang
- Department of Computational Biology, St Jude Children’s Research Hospital, Memphis, Tennessee, United States of America
| | - Michael D. L. Johnson
- Department of Infectious Diseases, St Jude Children’s Research Hospital, Memphis, Tennessee, United States of America
| | - Charles O. Rock
- Department of Infectious Diseases, St Jude Children’s Research Hospital, Memphis, Tennessee, United States of America
| | - Jason W. Rosch
- Department of Infectious Diseases, St Jude Children’s Research Hospital, Memphis, Tennessee, United States of America
- * E-mail:
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Meliopoulos VA, Van de Velde LA, Van de Velde NC, Karlsson EA, Neale G, Vogel P, Guy C, Sharma S, Duan S, Surman SL, Jones BG, Johnson MDL, Bosio C, Jolly L, Jenkins RG, Hurwitz JL, Rosch JW, Sheppard D, Thomas PG, Murray PJ, Schultz-Cherry S. An Epithelial Integrin Regulates the Amplitude of Protective Lung Interferon Responses against Multiple Respiratory Pathogens. PLoS Pathog 2016; 12:e1005804. [PMID: 27505057 PMCID: PMC4978498 DOI: 10.1371/journal.ppat.1005804] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2016] [Accepted: 07/11/2016] [Indexed: 01/11/2023] Open
Abstract
The healthy lung maintains a steady state of immune readiness to rapidly respond to injury from invaders. Integrins are important for setting the parameters of this resting state, particularly the epithelial-restricted αVβ6 integrin, which is upregulated during injury. Once expressed, αVβ6 moderates acute lung injury (ALI) through as yet undefined molecular mechanisms. We show that the upregulation of β6 during influenza infection is involved in disease pathogenesis. β6-deficient mice (β6 KO) have increased survival during influenza infection likely due to the limited viral spread into the alveolar spaces leading to reduced ALI. Although the β6 KO have morphologically normal lungs, they harbor constitutively activated lung CD11b+ alveolar macrophages (AM) and elevated type I IFN signaling activity, which we traced to the loss of β6-activated transforming growth factor-β (TGF-β). Administration of exogenous TGF-β to β6 KO mice leads to reduced numbers of CD11b+ AMs, decreased type I IFN signaling activity and loss of the protective phenotype during influenza infection. Protection extended to other respiratory pathogens such as Sendai virus and bacterial pneumonia. Our studies demonstrate that the loss of one epithelial protein, αVβ6 integrin, can alter the lung microenvironment during both homeostasis and respiratory infection leading to reduced lung injury and improved survival.
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Affiliation(s)
- Victoria A. Meliopoulos
- Department of Infectious Diseases, St Jude Children’s Research Hospital, Memphis, Tennessee, United States of America
| | - Lee-Ann Van de Velde
- Department of Infectious Diseases, St Jude Children’s Research Hospital, Memphis, Tennessee, United States of America
- Department of Immunology, St Jude Children’s Research Hospital, Memphis, Tennessee, United States of America
| | - Nicholas C. Van de Velde
- Department of Infectious Diseases, St Jude Children’s Research Hospital, Memphis, Tennessee, United States of America
- Department of Immunology, St Jude Children’s Research Hospital, Memphis, Tennessee, United States of America
| | - Erik A. Karlsson
- Department of Infectious Diseases, St Jude Children’s Research Hospital, Memphis, Tennessee, United States of America
| | - Geoff Neale
- The Hartwell Center, St Jude Children’s Research Hospital, Memphis, Tennessee, United States of America
| | - Peter Vogel
- Department of Veterinary Pathology Core, St Jude Children’s Research Hospital, Memphis, Tennessee, United States of America
| | - Cliff Guy
- Department of Immunology, St Jude Children’s Research Hospital, Memphis, Tennessee, United States of America
| | - Shalini Sharma
- Department of Immunology, St Jude Children’s Research Hospital, Memphis, Tennessee, United States of America
| | - Susu Duan
- Department of Immunology, St Jude Children’s Research Hospital, Memphis, Tennessee, United States of America
| | - Sherri L. Surman
- Department of Infectious Diseases, St Jude Children’s Research Hospital, Memphis, Tennessee, United States of America
| | - Bart G. Jones
- Department of Infectious Diseases, St Jude Children’s Research Hospital, Memphis, Tennessee, United States of America
| | - Michael D. L. Johnson
- Department of Infectious Diseases, St Jude Children’s Research Hospital, Memphis, Tennessee, United States of America
| | - Catharine Bosio
- Rocky Mountain Laboratories, NIAID, NIH, Hamilton, Montana, United States of America
| | - Lisa Jolly
- Division of Respiratory Medicine, University of Nottingham, Nottingham, United Kingdom
| | - R. Gisli Jenkins
- Division of Respiratory Medicine, University of Nottingham, Nottingham, United Kingdom
| | - Julia L. Hurwitz
- Department of Infectious Diseases, St Jude Children’s Research Hospital, Memphis, Tennessee, United States of America
| | - Jason W. Rosch
- Department of Infectious Diseases, St Jude Children’s Research Hospital, Memphis, Tennessee, United States of America
| | - Dean Sheppard
- Department of Medicine, Division of Pulmonary, Critical Care, Allergy, and Sleep Medicine, UCSF Medical Center, San Francisco, California, United States of America
| | - Paul G. Thomas
- Department of Immunology, St Jude Children’s Research Hospital, Memphis, Tennessee, United States of America
| | - Peter J. Murray
- Department of Infectious Diseases, St Jude Children’s Research Hospital, Memphis, Tennessee, United States of America
- Department of Immunology, St Jude Children’s Research Hospital, Memphis, Tennessee, United States of America
| | - Stacey Schultz-Cherry
- Department of Infectious Diseases, St Jude Children’s Research Hospital, Memphis, Tennessee, United States of America
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42
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Bruhn DF, Waidyarachchi SL, Madhura DB, Shcherbakov D, Zheng Z, Liu J, Abdelrahman YM, Singh AP, Duscha S, Rathi C, Lee RB, Belland RJ, Meibohm B, Rosch JW, Böttger EC, Lee RE. Aminomethyl spectinomycins as therapeutics for drug-resistant respiratory tract and sexually transmitted bacterial infections. Sci Transl Med 2016; 7:288ra75. [PMID: 25995221 DOI: 10.1126/scitranslmed.3010572] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
The antibiotic spectinomycin is a potent inhibitor of bacterial protein synthesis with a unique mechanism of action and an excellent safety index, but it lacks antibacterial activity against most clinically important pathogens. A series of N-benzyl-substituted 3'-(R)-3'-aminomethyl-3'-hydroxy spectinomycins was developed on the basis of a computational analysis of the aminomethyl spectinomycin binding site and structure-guided synthesis. These compounds had ribosomal inhibition values comparable to spectinomycin but showed increased potency against the common respiratory tract pathogens Streptococcus pneumoniae, Haemophilus influenzae, Legionella pneumophila, and Moraxella catarrhalis, as well as the sexually transmitted bacteria Neisseria gonorrhoeae and Chlamydia trachomatis. Non-ribosome-binding 3'-(S) isomers of the lead compounds demonstrated weak inhibitory activity in in vitro protein translation assays and poor antibacterial activity, indicating that the antibacterial activity of the series remains on target against the ribosome. Compounds also demonstrated no mammalian cytotoxicity, improved microsomal stability, and favorable pharmacokinetic properties in rats. The lead compound from the series exhibited excellent chemical stability superior to spectinomycin; no interaction with a panel of human receptors and drug metabolism enzymes, suggesting low potential for adverse reactions or drug-drug interactions in vivo; activity in vitro against a panel of penicillin-, macrolide-, and cephalosporin-resistant S. pneumoniae clinical isolates; and the ability to cure mice of fatal pneumococcal pneumonia and sepsis at a dose of 5 mg/kg. Together, these studies indicate that N-benzyl aminomethyl spectinomycins are suitable for further development to treat drug-resistant respiratory tract and sexually transmitted bacterial infections.
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Affiliation(s)
- David F Bruhn
- Department of Chemical Biology and Therapeutics, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Samanthi L Waidyarachchi
- Department of Chemical Biology and Therapeutics, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Dora B Madhura
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Tennessee Health Science Center, Memphis, TN, USA
| | - Dimitri Shcherbakov
- Institut für Medizinische Mikrobiologie, Universität Zürich, Zürich, Switzerland
| | - Zhong Zheng
- Department of Chemical Biology and Therapeutics, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Jiuyu Liu
- Department of Chemical Biology and Therapeutics, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Yasser M Abdelrahman
- Department of Microbiology, Immunology, and Biochemistry, University of Tennessee Health Science Center, Memphis, TN, USA
| | - Aman P Singh
- Department of Chemical Biology and Therapeutics, St. Jude Children's Research Hospital, Memphis, TN, USA.,Biomedical Sciences Graduate Program, University of Tennessee Health Science Center, Memphis, TN, USA
| | - Stefan Duscha
- Institut für Medizinische Mikrobiologie, Universität Zürich, Zürich, Switzerland
| | - Chetan Rathi
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Tennessee Health Science Center, Memphis, TN, USA
| | - Robin B Lee
- Department of Chemical Biology and Therapeutics, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Robert J Belland
- Department of Microbiology, Immunology, and Biochemistry, University of Tennessee Health Science Center, Memphis, TN, USA
| | - Bernd Meibohm
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Tennessee Health Science Center, Memphis, TN, USA
| | - Jason W Rosch
- Infectious Diseases Department, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Erik C Böttger
- Institut für Medizinische Mikrobiologie, Universität Zürich, Zürich, Switzerland
| | - Richard E Lee
- Department of Chemical Biology and Therapeutics, St. Jude Children's Research Hospital, Memphis, TN, USA
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43
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Brown LR, Gunnell SM, Cassella AN, Keller LE, Scherkenbach LA, Mann B, Brown MW, Hill R, Fitzkee NC, Rosch JW, Tuomanen EI, Thornton JA. AdcAII of Streptococcus pneumoniae Affects Pneumococcal Invasiveness. PLoS One 2016; 11:e0146785. [PMID: 26752283 PMCID: PMC4709005 DOI: 10.1371/journal.pone.0146785] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2015] [Accepted: 12/22/2015] [Indexed: 11/18/2022] Open
Abstract
Across bacterial species, metal binding proteins can serve functions in pathogenesis in addition to regulating metal homeostasis. We have compared and contrasted the activities of zinc (Zn2+)-binding lipoproteins AdcA and AdcAII in the Streptococcus pneumoniae TIGR4 background. Exposure to Zn2+-limiting conditions resulted in delayed growth in a strain lacking AdcAII (ΔAdcAII) when compared to wild type bacteria or a mutant lacking AdcA (ΔAdcA). AdcAII failed to interact with the extracellular matrix protein laminin despite homology to laminin-binding proteins of related streptococci. Deletion of AdcA or AdcAII led to significantly increased invasion of A549 human lung epithelial cells and a trend toward increased invasion in vivo. Loss of AdcAII, but not AdcA, was shown to negatively impact early colonization of the nasopharynx. Our findings suggest that expression of AdcAII affects invasiveness of S. pneumoniae in response to available Zn2+ concentrations.
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Affiliation(s)
- Lindsey R. Brown
- Department of Biological Sciences, Mississippi State University, Mississippi State, MS, 39762, United States of America
| | - Steven M. Gunnell
- Department of Biological Sciences, Mississippi State University, Mississippi State, MS, 39762, United States of America
| | - Adam N. Cassella
- Department of Biological Sciences, Mississippi State University, Mississippi State, MS, 39762, United States of America
| | - Lance E. Keller
- Department of Microbiology, University of Mississippi Medical Center, Jackson, MS, 39216, United States of America
| | - Lisa A. Scherkenbach
- Department of Infectious Diseases, St. Jude Children’s Research Hospital, Memphis, TN, 38105, United States of America
| | - Beth Mann
- Department of Infectious Diseases, St. Jude Children’s Research Hospital, Memphis, TN, 38105, United States of America
| | - Matthew W. Brown
- Department of Biological Sciences, Mississippi State University, Mississippi State, MS, 39762, United States of America
| | - Rebecca Hill
- Department of Chemistry, Mississippi State University, Mississippi State, MS, 39762, United States of America
| | - Nicholas C. Fitzkee
- Department of Chemistry, Mississippi State University, Mississippi State, MS, 39762, United States of America
| | - Jason W. Rosch
- Department of Infectious Diseases, St. Jude Children’s Research Hospital, Memphis, TN, 38105, United States of America
| | - Elaine I. Tuomanen
- Department of Infectious Diseases, St. Jude Children’s Research Hospital, Memphis, TN, 38105, United States of America
| | - Justin A. Thornton
- Department of Biological Sciences, Mississippi State University, Mississippi State, MS, 39762, United States of America
- * E-mail:
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44
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Johnson MDL, Echlin H, Dao TH, Rosch JW. Characterization of NAD salvage pathways and their role in virulence in Streptococcus pneumoniae. Microbiology (Reading) 2015; 161:2127-36. [PMID: 26311256 DOI: 10.1099/mic.0.000164] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
NAD is a necessary cofactor present in all living cells. Some bacteria cannot de novo synthesize NAD and must use the salvage pathway to import niacin or nicotinamide riboside via substrate importers NiaX and PnuC, respectively. Although homologues of these two importers and their substrates have been identified in other organisms, limited data exist in Streptococcus pneumoniae, specifically, on its effect on overall virulence. Here, we sought to characterize the substrate specificity of NiaX and PnuC in Str. pneumoniae TIGR4 and the contribution of these proteins to virulence of the pathogen. Although binding affinity of each importer for nicotinamide mononucleotide may overlap, we found NiaX to specifically import nicotinamide and nicotinic acid, and PnuC to be primarily responsible for nicotinamide riboside import. Furthermore, a pnuC mutant is completely attenuated during both intranasal and intratracheal infections in mice. Taken together, these findings underscore the importance of substrate salvage in pneumococcal pathogenesis and indicate that PnuC could potentially be a viable small-molecule therapeutic target to alleviate disease progression in the host.
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Affiliation(s)
- Michael D L Johnson
- Department of Infectious Diseases, St Jude Children's Research Hospital, Memphis, TN 38105-3678, USA
| | - Haley Echlin
- Department of Infectious Diseases, St Jude Children's Research Hospital, Memphis, TN 38105-3678, USA
| | - Tina H Dao
- Department of Infectious Diseases, St Jude Children's Research Hospital, Memphis, TN 38105-3678, USA
| | - Jason W Rosch
- Department of Infectious Diseases, St Jude Children's Research Hospital, Memphis, TN 38105-3678, USA
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45
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Abstract
Copper is universally toxic in excess, a feature exploited by the human immune system to facilitate bacterial clearance. The mechanism of copper intoxication remains unknown for many bacterial species. Here, we demonstrate that copper toxicity in Streptococcus pneumoniae is independent from oxidative stress but, rather, is the result of copper inhibiting the aerobic dNTP biosynthetic pathway. Furthermore, we show that copper-intoxicated S. pneumoniae is rescued by manganese, which is an essential metal in the aerobic nucleotide synthesis pathway. These data provide insight into new targets to enhance copper-mediated toxicity during bacterial clearance.
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Affiliation(s)
- Michael D L Johnson
- Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, TN 38105-3678, USA.
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46
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Carter R, Wolf J, van Opijnen T, Muller M, Obert C, Burnham C, Mann B, Li Y, Hayden RT, Pestina T, Persons D, Camilli A, Flynn PM, Tuomanen EI, Rosch JW. Genomic analyses of pneumococci from children with sickle cell disease expose host-specific bacterial adaptations and deficits in current interventions. Cell Host Microbe 2015; 15:587-599. [PMID: 24832453 DOI: 10.1016/j.chom.2014.04.005] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2013] [Revised: 02/10/2014] [Accepted: 03/20/2014] [Indexed: 10/25/2022]
Abstract
Sickle cell disease (SCD) patients are at high risk of contracting pneumococcal infection. To address this risk, they receive pneumococcal vaccines, and antibiotic prophylaxis and treatment. To assess the impact of SCD and these interventions on pneumococcal genetic architecture, we examined the genomes of more than 300 pneumococcal isolates from SCD patients over 20 years. Modern SCD strains retained invasive capacity but shifted away from the serotypes used in vaccines. These strains had specific genetic changes related to antibiotic resistance, capsule biosynthesis, metabolism, and metal transport. A murine SCD model coupled with Tn-seq mutagenesis identified 60 noncapsular pneumococcal genes under differential selective pressure in SCD, which correlated with aspects of SCD pathophysiology. Further, virulence determinants in the SCD context were distinct from the general population, and protective capacity of potential antigens was lost over time in SCD. This highlights the importance of understanding bacterial pathogenesis in the context of high-risk individuals.
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Affiliation(s)
- Robert Carter
- Department of Computational Biology, St. Jude Children's Research Hospital, Memphis, TN 38105 USA
| | - Joshua Wolf
- Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, TN 38105 USA
| | - Tim van Opijnen
- Tufts University School of Medicine, Department of Molecular Biology and Microbiology, 136 Harrison Avenue, Boston, MA 02111-1817 USA
| | - Martha Muller
- Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, TN 38105 USA
| | - Caroline Obert
- Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, TN 38105 USA
| | - Corinna Burnham
- Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, TN 38105 USA
| | - Beth Mann
- Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, TN 38105 USA
| | - Yimei Li
- Department of Biostatistics, St. Jude Children's Research Hospital, Memphis, TN 38105 USA
| | - Randall T Hayden
- Department of Pathology, St. Jude Children's Research Hospital, Memphis, TN 38105 USA
| | - Tamara Pestina
- Department of Experimental Hematology, St. Jude Children's Research Hospital, Memphis, TN 38105 USA
| | - Derek Persons
- Department of Experimental Hematology, St. Jude Children's Research Hospital, Memphis, TN 38105 USA
| | - Andrew Camilli
- Tufts University School of Medicine, Department of Molecular Biology and Microbiology, 136 Harrison Avenue, Boston, MA 02111-1817 USA.,Howard Hughes Medical Institute, Department of Molecular Biology and Microbiology, 136 Harrison Avenue, Boston, MA 02111-1817 USA
| | - Patricia M Flynn
- Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, TN 38105 USA
| | - Elaine I Tuomanen
- Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, TN 38105 USA
| | - Jason W Rosch
- Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, TN 38105 USA
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47
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Mina MJ, Klugman KP, Rosch JW, McCullers JA. Live attenuated influenza virus increases pneumococcal translocation and persistence within the middle ear. J Infect Dis 2014; 212:195-201. [PMID: 25505300 DOI: 10.1093/infdis/jiu804] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2014] [Accepted: 12/05/2014] [Indexed: 12/29/2022] Open
Abstract
BACKGROUND Infection with influenza A virus (IAV) increases susceptibility to respiratory bacterial infections, resulting in increased bacterial carriage and complications such acute otitis media, pneumonia, bacteremia, and meningitis. Recently, vaccination with live attenuated influenza virus (LAIV) was reported to enhance subclinical bacterial colonization within the nasopharynx, similar to IAV. Although LAIV does not predispose to bacterial pneumonia, whether it may alter bacterial transmigration toward the middle ear, where it could have clinically relevant implications, has not been investigated. METHODS BALB/c mice received LAIV or phosphate-buffered saline 1 or 7 days before or during pneumococcal colonization with either of 2 clinical isolates, 19F or 7F. Middle ear bacterial titers were monitored daily via in vivo imaging. RESULTS LAIV increased bacterial transmigration to and persistence within the middle ear. When colonization followed LAIV inoculation, a minimum LAIV incubation period of 4 days was required before bacterial transmigration commenced. CONCLUSIONS While LAIV vaccination is safe and effective at reducing IAV and coinfection with influenza virus and bacteria, LAIV may increase bacterial transmigration to the middle ear and could thus increase the risk of clinically relevant acute otitis media. These data warrant further investigations into interactions between live attenuated viruses and naturally colonizing bacterial pathogens.
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Affiliation(s)
- Michael J Mina
- Medical Scientist Training Program, Emory University School of Medicine Department of Global Health, Rollins School of Public Health, Emory University, Atlanta, Georgia Department of Infectious Diseases, St Jude Children's Research Hospital, Memphis, Tennessee
| | - Keith P Klugman
- Department of Global Health, Rollins School of Public Health, Emory University, Atlanta, Georgia
| | - Jason W Rosch
- Department of Infectious Diseases, St Jude Children's Research Hospital, Memphis, Tennessee
| | - Jonathan A McCullers
- Department of Infectious Diseases, St Jude Children's Research Hospital, Memphis, Tennessee
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48
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Abstract
The pneumococcus is a remarkably adaptable pathogen whose disease manifestations range from mucosal surface infections such as acute otitis media and pneumonia to invasive infections such as sepsis and meningitis. Currently approved vaccines target the polysaccharide capsule, of which there are over 90 distinct serotypes, leading to rapid serotype replacement in vaccinated populations. Substantial progress has been made in the development of a universal pneumococcal vaccine, with efforts focused on broadly conserved and protective protein antigens. An area attracting considerable attention is the potential application of live attenuated vaccines to confer serotype-independent protection against mucosal and systemic infection. On the basis of recent work to understand the mucosal and systemic responses to nasal administration of pneumococci and to develop novel attenuation strategies, the prospect of a practical and protective live vaccine remains promising.
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Affiliation(s)
- Jason W Rosch
- a Department of Infectious Diseases; St. Jude Children's Research Hospital ; Memphis , TN USA
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49
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Rosch JW, Iverson AR, Humann J, Mann B, Gao G, Vogel P, Mina M, Murrah KA, Perez AC, Edward Swords W, Tuomanen EI, McCullers JA. A live-attenuated pneumococcal vaccine elicits CD4+ T-cell dependent class switching and provides serotype independent protection against acute otitis media. EMBO Mol Med 2014; 6:141-54. [PMID: 24408968 PMCID: PMC3936495 DOI: 10.1002/emmm.201202150] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2012] [Revised: 09/06/2013] [Accepted: 09/23/2013] [Indexed: 01/19/2023] Open
Abstract
Acute otitis media (AOM) caused by Streptococcus pneumoniae remains one of the most common infectious diseases worldwide despite widespread vaccination. A major limitation of the currently licensed pneumococcal vaccines is the lack of efficacy against mucosal disease manifestations such as AOM, acute bacterial sinusitis and pneumonia. We sought to generate a novel class of live vaccines that (1) retain all major antigenic virulence proteins yet are fully attenuated and (2) protect against otitis media. A live vaccine candidate based on deletion of the signal recognition pathway component ftsY induced potent, serotype-independent protection against otitis media, sinusitis, pneumonia and invasive pneumococcal disease. Protection was maintained in animals coinfected with influenza virus, but was lost if mice were depleted of CD4(+) T cells at the time of vaccination. The live vaccine induced a strong serum IgG2a and IgG2b response that correlated with CD4(+) T-cell mediated class switching. Deletion of genes required for microbial adaptation to the host environment is a novel live attenuated vaccine strategy yielding the first experimental vaccine effective against pneumococcal otitis media.
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Affiliation(s)
- Jason W Rosch
- Department of Infectious Diseases, St. Jude Children's Research HospitalMemphis, TN, USA
| | - Amy R Iverson
- Department of Infectious Diseases, St. Jude Children's Research HospitalMemphis, TN, USA
| | - Jessica Humann
- Department of Infectious Diseases, St. Jude Children's Research HospitalMemphis, TN, USA
| | - Beth Mann
- Department of Infectious Diseases, St. Jude Children's Research HospitalMemphis, TN, USA
| | - Geli Gao
- Department of Infectious Diseases, St. Jude Children's Research HospitalMemphis, TN, USA
| | - Peter Vogel
- Department of Pathology, St. Jude Children's Research HospitalMemphis, TN, USA
| | - Michael Mina
- Emory University School of MedicineAtlanta, GA, USA
| | - Kyle A Murrah
- Department of Microbiology and Immunology, Wake Forest School of MedicineWinston-Salem, NC, USA
| | - Antonia C Perez
- Department of Microbiology and Immunology, Wake Forest School of MedicineWinston-Salem, NC, USA
| | - W Edward Swords
- Department of Microbiology and Immunology, Wake Forest School of MedicineWinston-Salem, NC, USA
| | - Elaine I Tuomanen
- Department of Infectious Diseases, St. Jude Children's Research HospitalMemphis, TN, USA
| | - Jonathan A McCullers
- Department of Infectious Diseases, St. Jude Children's Research HospitalMemphis, TN, USA
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50
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Honsa ES, Johnson MDL, Rosch JW. The roles of transition metals in the physiology and pathogenesis of Streptococcus pneumoniae. Front Cell Infect Microbiol 2013; 3:92. [PMID: 24364001 PMCID: PMC3849628 DOI: 10.3389/fcimb.2013.00092] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2013] [Accepted: 11/19/2013] [Indexed: 01/01/2023] Open
Abstract
For bacterial pathogens whose sole environmental reservoir is the human host, the acquisition of essential nutrients, particularly transition metals, is a critical aspect of survival due to tight sequestration and limitation strategies deployed to curtail pathogen outgrowth. As such, these bacteria have developed diverse, specialized acquisition mechanisms to obtain these metals from the niches of the body in which they reside. To oppose the spread of infection, the human host has evolved multiple mechanisms to counter bacterial invasion, including sequestering essential metals away from bacteria and exposing bacteria to lethal concentrations of metals. Hence, to maintain homeostasis within the host, pathogens must be able to acquire necessary metals from host proteins and to export such metals when concentrations become detrimental. Furthermore, this acquisition and efflux equilibrium must occur in a tissue-specific manner because the concentration of metals varies greatly within the various microenvironments of the human body. In this review, we examine the functional roles of the metal import and export systems of the Gram-positive pathogen Streptococcus pneumoniae in both signaling and pathogenesis.
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Affiliation(s)
- Erin S Honsa
- Department of Infectious Diseases, St. Jude Children's Research Hospital Memphis, TN, USA
| | - Michael D L Johnson
- Department of Infectious Diseases, St. Jude Children's Research Hospital Memphis, TN, USA
| | - Jason W Rosch
- Department of Infectious Diseases, St. Jude Children's Research Hospital Memphis, TN, USA
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