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Hoedt EC, Hueston CM, Cash N, Bongers RS, Keane JM, van Limpt K, Ben Amor K, Knol J, MacSharry J, van Sinderen D. A synbiotic mixture of selected oligosaccharides and bifidobacteria assists murine gut microbiota restoration following antibiotic challenge. MICROBIOME 2023; 11:168. [PMID: 37528457 PMCID: PMC10394833 DOI: 10.1186/s40168-023-01595-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2022] [Accepted: 06/09/2023] [Indexed: 08/03/2023]
Abstract
BACKGROUND Typically, animal models studying gastrointestinal microbiotas compromised in early life have employed either germ-free animals or mice treated with a cocktail of antibiotics. Such studies intend to mimic scenarios of infants born by caesarean section and/or subjected to antibiotic treatment. However, the antibiotics used in these studies are rarely prescribed to infants. Therefore, an early life model was developed in which the murine gastrointestinal microbiota was severely disrupted by clindamycin treatment. RESULTS In this mouse model, we investigated the extent supplementation with a synbiotic mixture of prebiotics, being scGOS/lcFOS with the human milk oligosaccharide 2'-Fucosyllactose (2'-FL), in combination with or without single strain or mix of "infant type" bifidobacteria, can rescue an antibiotic-compromised microbiota. Shotgun metagenomic sequencing showed that the microbiota was severely disrupted by the clindamycin challenge. No recovery was observed 3 weeks post-challenge in the scGOS/lcFOS/2'FL group, while the group that received the synbiotic treatment of scGOS/lcFOS/2'-FL with Bifidobacterium breve NRBB01 showed partial recovery. Strikingly in the scGOS/lcFOS/2'-FL group receiving the mixture of bifidobacteria resulted in a recovery of the microbiota disruption. Histological analyses showed that the clindamycin-treated animals at the end of the experiment still suffered from mild oedema and villi/colonic crypt irregularities which was ameliorated by the synbiotic intervention. CONCLUSION Our study demonstrates that supplementation of synbiotic mixture of scGOS/lcFOS/2'-FL in combination with a specific mix of infant-type bifidobacterial strains is able to partially revive an antibiotic-perturbed gastrointestinal microbiota. Video Abstract.
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Affiliation(s)
- Emily C Hoedt
- APC Microbiome Ireland, University College Cork, Western Road, Cork, Ireland
- Current address: NHMRC CRE in Digestive Health, HMRI, Newcastle, NSW, Australia
| | - Cara M Hueston
- APC Microbiome Ireland, University College Cork, Western Road, Cork, Ireland
| | - Nora Cash
- APC Microbiome Ireland, University College Cork, Western Road, Cork, Ireland
| | | | - Jonathan M Keane
- APC Microbiome Ireland, University College Cork, Western Road, Cork, Ireland
| | | | | | - Jan Knol
- Danone Nutricia Research, Utrecht, The Netherlands
- Laboratory of Microbiology, Wageningen University, Wageningen, The Netherlands
| | - John MacSharry
- APC Microbiome Ireland, University College Cork, Western Road, Cork, Ireland.
- School of Microbiology, University College Cork, Western Road, Cork, Ireland.
- School of Medicine, University College Cork, Cork, Ireland.
| | - Douwe van Sinderen
- APC Microbiome Ireland, University College Cork, Western Road, Cork, Ireland.
- School of Microbiology, University College Cork, Western Road, Cork, Ireland.
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2
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Herzog MKM, Cazzaniga M, Peters A, Shayya N, Beldi L, Hapfelmeier S, Heimesaat MM, Bereswill S, Frankel G, Gahan CG, Hardt WD. Mouse models for bacterial enteropathogen infections: insights into the role of colonization resistance. Gut Microbes 2023; 15:2172667. [PMID: 36794831 PMCID: PMC9980611 DOI: 10.1080/19490976.2023.2172667] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/02/2022] [Accepted: 01/18/2023] [Indexed: 02/17/2023] Open
Abstract
Globally, enteropathogenic bacteria are a major cause of morbidity and mortality.1-3 Campylobacter, Salmonella, Shiga-toxin-producing Escherichia coli, and Listeria are among the top five most commonly reported zoonotic pathogens in the European Union.4 However, not all individuals naturally exposed to enteropathogens go on to develop disease. This protection is attributable to colonization resistance (CR) conferred by the gut microbiota, as well as an array of physical, chemical, and immunological barriers that limit infection. Despite their importance for human health, a detailed understanding of gastrointestinal barriers to infection is lacking, and further research is required to investigate the mechanisms that underpin inter-individual differences in resistance to gastrointestinal infection. Here, we discuss the current mouse models available to study infections by non-typhoidal Salmonella strains, Citrobacter rodentium (as a model for enteropathogenic and enterohemorrhagic E. coli), Listeria monocytogenes, and Campylobacter jejuni. Clostridioides difficile is included as another important cause of enteric disease in which resistance is dependent upon CR. We outline which parameters of human infection are recapitulated in these mouse models, including the impact of CR, disease pathology, disease progression, and mucosal immune response. This will showcase common virulence strategies, highlight mechanistic differences, and help researchers from microbiology, infectiology, microbiome research, and mucosal immunology to select the optimal mouse model.
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Affiliation(s)
- Mathias K.-M. Herzog
- Department of Biology, Institute of Microbiology, ETH Zurich, Zurich, Switzerland
| | - Monica Cazzaniga
- APC Microbiome Ireland, University College Cork, Cork, Ireland
- School of Microbiology, University College Cork, Cork, Ireland
| | - Audrey Peters
- Department of Life Sciences, MRC Centre for Molecular Bacteriology and Infection, Imperial College London, London, UK
| | - Nizar Shayya
- Institute of Microbiology, Infectious Diseases and Immunology, Charité - University Medicine Berlin, Berlin, Germany
| | - Luca Beldi
- Institute for Infectious Diseases, University of Bern, Bern, Switzerland
| | | | - Markus M. Heimesaat
- Institute of Microbiology, Infectious Diseases and Immunology, Charité - University Medicine Berlin, Berlin, Germany
| | - Stefan Bereswill
- Institute of Microbiology, Infectious Diseases and Immunology, Charité - University Medicine Berlin, Berlin, Germany
| | - Gad Frankel
- Department of Life Sciences, MRC Centre for Molecular Bacteriology and Infection, Imperial College London, London, UK
| | - Cormac G.M. Gahan
- APC Microbiome Ireland, University College Cork, Cork, Ireland
- School of Microbiology, University College Cork, Cork, Ireland
- School of Pharmacy, University College Cork, Cork, Ireland
| | - Wolf-Dietrich Hardt
- Department of Biology, Institute of Microbiology, ETH Zurich, Zurich, Switzerland
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3
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Wen B, Taibi A, Villa CR, Lee SH, Sagaidak S, Comelli EM. Effects of Bifidobacterium bifidum in Mice Infected with Citrobacter rodentium. Microorganisms 2019; 7:microorganisms7020051. [PMID: 30769786 PMCID: PMC6407003 DOI: 10.3390/microorganisms7020051] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2018] [Revised: 02/07/2019] [Accepted: 02/11/2019] [Indexed: 12/20/2022] Open
Abstract
In vitro and in vivo studies suggest that selected Bifidobacterium bifidum strains sustain intestinal homeostasis. This study aimed to examine whether the administration of B. bifidum MIMBb75 (BB75) attenuates Citrobacter rodentium infection, a murine model for enteric infection and inflammatory bowel disease in humans. C57Bl6/J mice were randomized to receive BB75 daily starting before or after C. rodentium infection. BB75 load and infection kinetics were monitored. On day 10 post-infection (p.i.), histological parameters of the large intestine were assessed. Barrier integrity was evaluated by pathogen translocation to secondary organs and in vivo permeability test. Fecal C. rodentium load peaked at 1010 CFU/g at day 10 p.i., with clearance at day 24 p.i., regardless of probiotic treatment. BB75 administration resulted in 107 cells/g of feces with no effect of timing of administration. BB75 treatment did not attenuate C. rodentium-induced crypt hyperplasia nor inflammation. C. rodentium and BB75 can co-exist in the gut with no mutual displacement. However, BB75 cannot counteract C. rodentium pathology. Our findings provide insight for the understanding of probiotics behavior and their clinical relevance in intestinal inflammation.
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Affiliation(s)
- Bijun Wen
- Department of Nutritional Sciences, Faculty of Medicine, University of Toronto, Toronto, ON M5S 1A8, Canada.
| | - Amel Taibi
- Department of Nutritional Sciences, Faculty of Medicine, University of Toronto, Toronto, ON M5S 1A8, Canada.
| | - Christopher R Villa
- Department of Nutritional Sciences, Faculty of Medicine, University of Toronto, Toronto, ON M5S 1A8, Canada.
| | - Shin-Hann Lee
- Department of Nutritional Sciences, Faculty of Medicine, University of Toronto, Toronto, ON M5S 1A8, Canada.
| | - Sofia Sagaidak
- Department of Nutritional Sciences, Faculty of Medicine, University of Toronto, Toronto, ON M5S 1A8, Canada.
| | - Elena M Comelli
- Department of Nutritional Sciences, Faculty of Medicine, University of Toronto, Toronto, ON M5S 1A8, Canada.
- Joannah and Brian Lawson Centre for Child Nutrition, Faculty of Medicine, University of Toronto, Toronto, ON M5S 1A8, Canada.
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4
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Taylor PW, Francis KP. Can 3D imaging provide insights into spatial variations in bacterial infection patterns? Future Microbiol 2018; 13:897-901. [DOI: 10.2217/fmb-2017-0272] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Recently developed 3D noninvasive in vivo optical imaging is providing fresh insights into the understanding of the pathogenesis of invasive bacteria in small animal experimental models. Here, we describe the advantages of 3D diffuse light imaging tomography with integrated micro-computed tomography (DLIT-μCT) over more traditional 2D systems, in particular with regard to precise localization of infectious foci within tissues in 3D space. We highlight data from rodent studies that employ experimental infections replicating the course of naturally occurring bacterial disease, such as invasive Escherichia coli infections that arise following colonization of the GI tract in neonatal rats. It is argued that this technology will find increasing utility in the study and diagnosis of infectious disease.
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Affiliation(s)
- Peter W Taylor
- School of Pharmacy, University College London, London WC1N 1AX, UK
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5
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Birchenough GMH, Dalgakiran F, Witcomb LA, Johansson MEV, McCarthy AJ, Hansson GC, Taylor PW. Postnatal development of the small intestinal mucosa drives age-dependent, regio-selective susceptibility to Escherichia coli K1 infection. Sci Rep 2017; 7:83. [PMID: 28250440 PMCID: PMC5427930 DOI: 10.1038/s41598-017-00123-w] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2016] [Accepted: 02/08/2017] [Indexed: 12/22/2022] Open
Abstract
The strong age dependency of neonatal systemic infection with Escherichia coli K1 can be replicated in the neonatal rat. Gastrointestinal (GI) colonization of two-day-old (P2) rats leads to invasion of the blood within 48 h of initiation of colonization; pups become progressively less susceptible to infection over the P2-P9 period. We show that, in animals colonized at P2 but not at P9, E. coli K1 bacteria gain access to the enterocyte surface in the mid-region of the small intestine and translocate through the epithelial cell monolayer by an intracellular pathway to the submucosa. In this region of the GI tract, the protective mucus barrier is poorly developed but matures to full thickness over P2-P9, coincident with the development of resistance to invasion. At P9, E. coli K1 bacteria are physically separated from villi by the mucus layer and their numbers controlled by mucus-embedded antimicrobial peptides, preventing invasion of host tissues.
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Affiliation(s)
- George M H Birchenough
- Department of Medical Biochemistry, University of Gothenburg, SE-405 30, Gothenburg, Sweden
| | - Fatma Dalgakiran
- School of Pharmacy, University College London, London, WC1N 1AX, UK
| | - Luci A Witcomb
- School of Pharmacy, University College London, London, WC1N 1AX, UK
| | - Malin E V Johansson
- Department of Medical Biochemistry, University of Gothenburg, SE-405 30, Gothenburg, Sweden
| | - Alex J McCarthy
- School of Pharmacy, University College London, London, WC1N 1AX, UK
| | - Gunnar C Hansson
- Department of Medical Biochemistry, University of Gothenburg, SE-405 30, Gothenburg, Sweden
| | - Peter W Taylor
- School of Pharmacy, University College London, London, WC1N 1AX, UK.
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Model of Host-Pathogen Interaction Dynamics Links In Vivo Optical Imaging and Immune Responses. Infect Immun 2016; 85:IAI.00606-16. [PMID: 27821583 PMCID: PMC5203651 DOI: 10.1128/iai.00606-16] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2016] [Accepted: 10/16/2016] [Indexed: 01/13/2023] Open
Abstract
Tracking disease progression in vivo is essential for the development of treatments against bacterial infection. Optical imaging has become a central tool for in vivo tracking of bacterial population development and therapeutic response. For a precise understanding of in vivo imaging results in terms of disease mechanisms derived from detailed postmortem observations, however, a link between the two is needed. Here, we develop a model that provides that link for the investigation of Citrobacter rodentium infection, a mouse model for enteropathogenic Escherichia coli (EPEC). We connect in vivo disease progression of C57BL/6 mice infected with bioluminescent bacteria, imaged using optical tomography and X-ray computed tomography, to postmortem measurements of colonic immune cell infiltration. We use the model to explore changes to both the host immune response and the bacteria and to evaluate the response to antibiotic treatment. The developed model serves as a novel tool for the identification and development of new therapeutic interventions.
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7
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Inaba Y, Ueno N, Numata M, Zhu X, Messer JS, Boone DL, Fujiya M, Kohgo Y, Musch MW, Chang EB. Soluble bioactive microbial mediators regulate proteasomal degradation and autophagy to protect against inflammation-induced stress. Am J Physiol Gastrointest Liver Physiol 2016; 311:G634-G647. [PMID: 27514476 PMCID: PMC5142193 DOI: 10.1152/ajpgi.00092.2016] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/02/2016] [Accepted: 08/07/2016] [Indexed: 01/31/2023]
Abstract
Bifidobacterium breve and other Gram-positive gut commensal microbes protect the gastrointestinal epithelium against inflammation-induced stress. However, the mechanisms whereby these bacteria accomplish this protection are poorly understood. In this study, we examined soluble factors derived from Bifidobacterium breve and their impact on the two major protein degradation systems within intestinal epithelial cells, proteasomes and autophagy. Conditioned media from gastrointestinal Gram-positive, but not Gram-negative, bacteria activated autophagy and increased expression of the autophagy proteins Atg5 and Atg7 along with the stress response protein heat shock protein 27. Specific examination of media conditioned by the Gram-positive bacterium Bifidobacterium breve (Bb-CM) showed that this microbe produces small molecules (<3 kDa) that increase expression of the autophagy proteins Atg5 and Atg7, activate autophagy, and inhibit proteasomal enzyme activity. Upregulation of autophagy by Bb-CM was mediated through MAP kinase signaling. In vitro studies using C2BBe1 cells silenced for Atg7 and in vivo studies using mice conditionally deficient in intestinal epithelial cell Atg7 showed that Bb-CM-induced cytoprotection is dependent on autophagy. Therefore, this work demonstrates that Gram-positive bacteria modify protein degradation programs within intestinal epithelial cells to promote their survival during stress. It also reveals the therapeutic potential of soluble molecules produced by these microbes for prevention and treatment of gastrointestinal disease.
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Affiliation(s)
- Yuhei Inaba
- Department of Medicine, Inflammatory Bowel Disease Research Center, The University of Chicago, Chicago, Illinois; Division of Gastroenterology and Hematology/Oncology, Department of Medicine, Asahikawa Medical University, Asahikawa, Japan
| | - Nobuhiro Ueno
- Department of Medicine, Inflammatory Bowel Disease Research Center, The University of Chicago, Chicago, Illinois; Division of Gastroenterology and Hematology/Oncology, Department of Medicine, Asahikawa Medical University, Asahikawa, Japan
| | - Masatsugu Numata
- Department of Medicine, Inflammatory Bowel Disease Research Center, The University of Chicago, Chicago, Illinois; Division of Life Style and Digestive Diseases, Kagoshima Medical University, Kagoshima, Japan
| | - Xiaorong Zhu
- Department of Medicine, Inflammatory Bowel Disease Research Center, The University of Chicago, Chicago, Illinois
| | - Jeannette S Messer
- Department of Medicine, Inflammatory Bowel Disease Research Center, The University of Chicago, Chicago, Illinois
| | - David L Boone
- Department of Microbiology and Immunology, Indiana University School of Medicine-South Bend, South Bend, Indiana
| | - Mikihiro Fujiya
- Division of Gastroenterology and Hematology/Oncology, Department of Medicine, Asahikawa Medical University, Asahikawa, Japan
| | - Yutaka Kohgo
- Division of Gastroenterology and Hematology/Oncology, Department of Medicine, Asahikawa Medical University, Asahikawa, Japan
| | - Mark W Musch
- Department of Medicine, Inflammatory Bowel Disease Research Center, The University of Chicago, Chicago, Illinois
| | - Eugene B Chang
- Department of Medicine, Inflammatory Bowel Disease Research Center, The University of Chicago, Chicago, Illinois;
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8
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Crepin VF, Collins JW, Habibzay M, Frankel G. Citrobacter rodentium mouse model of bacterial infection. Nat Protoc 2016; 11:1851-76. [PMID: 27606775 DOI: 10.1038/nprot.2016.100] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Infection of mice with Citrobacter rodentium is a robust model to study bacterial pathogenesis, mucosal immunology, the health benefits of probiotics and the role of the microbiota during infection. C. rodentium was first isolated by Barthold from an outbreak of mouse diarrhea in Yale University in 1972 and was 'rediscovered' by Falkow and Schauer in 1993. Since then the use of the model has proliferated, and it is now the gold standard for studying virulence of the closely related human pathogens enteropathogenic and enterohemorrhagic Escherichia coli (EPEC and EHEC, respectively). Here we provide a detailed protocol for various applications of the model, including bacterial growth, site-directed mutagenesis, mouse inoculation (from cultured cells and after cohabitation), monitoring of bacterial colonization, tissue extraction and analysis, immune responses, probiotic treatment and microbiota analysis. The main protocol, from mouse infection to clearance and analysis of tissues and host responses, takes ∼5 weeks to complete.
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Affiliation(s)
- Valerie F Crepin
- MRC Centre for Molecular Bacteriology and Infection, Department of Life Sciences, Imperial College, London, UK
| | - James W Collins
- MRC Centre for Molecular Bacteriology and Infection, Department of Life Sciences, Imperial College, London, UK
| | - Maryam Habibzay
- MRC Centre for Molecular Bacteriology and Infection, Department of Life Sciences, Imperial College, London, UK
| | - Gad Frankel
- MRC Centre for Molecular Bacteriology and Infection, Department of Life Sciences, Imperial College, London, UK
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9
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Witcomb LA, Collins JW, McCarthy AJ, Frankel G, Taylor PW. Bioluminescent imaging reveals novel patterns of colonization and invasion in systemic Escherichia coli K1 experimental infection in the neonatal rat. Infect Immun 2015; 83:4528-40. [PMID: 26351276 PMCID: PMC4645386 DOI: 10.1128/iai.00953-15] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2015] [Accepted: 09/03/2015] [Indexed: 11/20/2022] Open
Abstract
Key features of Escherichia coli K1-mediated neonatal sepsis and meningitis, such as a strong age dependency and development along the gut-mesentery-blood-brain course of infection, can be replicated in the newborn rat. We examined temporal and spatial aspects of E. coli K1 infection following initiation of gastrointestinal colonization in 2-day-old (P2) rats after oral administration of E. coli K1 strain A192PP and a virulent bioluminescent derivative, E. coli A192PP-lux2. A combination of bacterial enumeration in the major organs, two-dimensional bioluminescence imaging, and three-dimensional diffuse light imaging tomography with integrated micro-computed tomography indicated multiple sites of colonization within the alimentary canal; these included the tongue, esophagus, and stomach in addition to the small intestine and colon. After invasion of the blood compartment, the bacteria entered the central nervous system, with restricted colonization of the brain, and also invaded the major organs, in line with increases in the severity of symptoms of infection. Both keratinized and nonkeratinized surfaces of esophagi were colonized to a considerably greater extent in susceptible P2 neonates than in corresponding tissues from infection-resistant 9-day-old rat pups; the bacteria appeared to damage and penetrate the nonkeratinized esophageal epithelium of infection-susceptible P2 animals, suggesting the esophagus represents a portal of entry for E. coli K1 into the systemic circulation. Thus, multimodality imaging of experimental systemic infections in real time indicates complex dynamic patterns of colonization and dissemination that provide new insights into the E. coli K1 infection of the neonatal rat.
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Affiliation(s)
- Luci A Witcomb
- University College London School of Pharmacy, London, United Kingdom
| | - James W Collins
- MRC Centre for Molecular Bacteriology and Infection, Imperial College London, London, United Kingdom
| | - Alex J McCarthy
- University College London School of Pharmacy, London, United Kingdom
| | - Gadi Frankel
- MRC Centre for Molecular Bacteriology and Infection, Imperial College London, London, United Kingdom
| | - Peter W Taylor
- University College London School of Pharmacy, London, United Kingdom
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10
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Bifidobacteria-host interactions--an update on colonisation factors. BIOMED RESEARCH INTERNATIONAL 2014; 2014:960826. [PMID: 25295282 PMCID: PMC4177770 DOI: 10.1155/2014/960826] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/07/2014] [Revised: 08/20/2014] [Accepted: 08/20/2014] [Indexed: 01/10/2023]
Abstract
Bifidobacteria are one of the predominant bacterial groups of the human intestinal microbiota and have important functional properties making them interesting for the food and dairy industries. Numerous in vitro and preclinical studies have shown beneficial effects of particular bifidobacterial strains or strain combinations on various health parameters of their hosts. This indicates the potential of bifidobacteria in alternative or supplementary therapeutic approaches in a number of diseased states. Based on these observations, bifidobacteria have attracted considerable interest by the food, dairy, and pharmaceutical industries and they are widely used as so-called probiotics. As a consequence of the rapidly increasing number of available bifidobacterial genome sequences and their analysis, there has been substantial progress in the identification of bifidobacterial structures involved in colonisation of and interaction with the host. With the present review, we aim to provide an update on the current knowledge on the mechanisms by which bifidobacteria colonise their hosts and exert health promoting effects.
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11
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Collins JW, Chervaux C, Raymond B, Derrien M, Brazeilles R, Kosta A, Chambaud I, Crepin VF, Frankel G. Fermented dairy products modulate Citrobacter rodentium-induced colonic hyperplasia. J Infect Dis 2014; 210:1029-41. [PMID: 24706936 PMCID: PMC4157696 DOI: 10.1093/infdis/jiu205] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
We evaluated the protective effects of fermented dairy products (FDPs) in an infection model, using the mouse pathogen Citrobacter rodentium (CR). Treatment of mice with FDP formulas A, B, and C or a control product did not affect CR colonization, organ specificity, or attaching and effacing lesion formation. Fermented dairy product A (FDP-A), but neither the supernatant from FDP-A nor β-irradiated (IR) FDP-A, caused a significant reduction in colonic crypt hyperplasia and CR-associated pathology. Profiling the gut microbiota revealed that IR-FDP-A promoted higher levels of phylotypes belonging to Alcaligenaceae and a decrease in Lachnospiraceae (Ruminococcus) during CR infection. Conversely, FDP-A prevented a decrease in Ruminococcus and increased Turicibacteraceae (Turicibacter). Importantly, loss of Ruminococcus and Turicibacter has been associated with susceptibility to dextran sodium sulfate-induced colitis. Our results demonstrate that viable bacteria in FDP-A reduced CR-induced colonic crypt hyperplasia and prevented the loss of key bacterial genera that may contribute to disease pathology.
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Affiliation(s)
- James W Collins
- MRC Centre for Molecular Bacteriology and Infection, Department of Life Sciences, Imperial College London, United Kingdom
| | | | - Benoit Raymond
- MRC Centre for Molecular Bacteriology and Infection, Department of Life Sciences, Imperial College London, United Kingdom
| | - Muriel Derrien
- Danone Nutricia Research, Centre Daniel Carasso, Palaiseau
| | | | - Artemis Kosta
- MRC Centre for Molecular Bacteriology and Infection, Department of Life Sciences, Imperial College London, United Kingdom
| | | | - Valerie F Crepin
- MRC Centre for Molecular Bacteriology and Infection, Department of Life Sciences, Imperial College London, United Kingdom
| | - Gad Frankel
- MRC Centre for Molecular Bacteriology and Infection, Department of Life Sciences, Imperial College London, United Kingdom
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12
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Restori KH, McDaniel KL, Wray AE, Cantorna MT, Ross AC. Streptococcus pneumoniae-induced pneumonia and Citrobacter rodentium-induced gut infection differentially alter vitamin A concentrations in the lung and liver of mice. J Nutr 2014; 144:392-8. [PMID: 24431327 PMCID: PMC3927551 DOI: 10.3945/jn.113.186569] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
In the developing world, vitamin A (VA) deficiency is endemic in populations that are also at great risk of morbidity and mortality because of pneumococcal pneumonia and enteric infections. To better understand how lung and gastrointestinal pathogens affect VA status, we assessed VA concentrations in serum, lung, and liver during an invasive pneumonia infection induced by Streptococcus pneumoniae serotype 3, and a noninvasive gut infection induced by Citrobacter rodentium, in vitamin A-adequate (VAA) and vitamin A-deficient (VAD) mice. For pneumonia infection, mice were immunized with pneumococcal polysaccharide serotype 3 (PPS3), or not (infected-control), 5 d prior to intranasal inoculation with S. pneumoniae. Two days post-inoculation, immunization was protective against systemic infection regardless of VA status as PPS3 immunization decreased bacteremia compared with infected-control mice (P < 0.05). Retinol concentrations in the lung were higher in infected-control VAA mice (15.7 nmol/g: P < 0.05) compared with PPS3-immunized mice (8.23 nmol/g), but this was not associated with increased lung bacterial burden. VAA mice had reduced severity of C. rodentium-induced gut infection as measured by fecal bacterial shedding compared with VAD mice (P < 0.05). Liver retinol and retinyl ester concentrations in VAA mice decreased at the peak of infection (retinol, 8.1 nmol/g; retinyl esters, 985 nmol/g; P < 0.05, compared with uninfected mice; retinol, 29.5 nmol/g; retinyl esters, 1730 nmol/g), whereas tissue VA concentrations were low in VAD mice during both infections. Colonic mucin gene expression was also depressed at peak infection compared with uninfected mice (P < 0.05). Overall, pneumonia had less effect on VA status than gastrointestinal infection, predominantly owing to reduced hepatic VA storage at the peak of gut infection.
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Affiliation(s)
| | | | | | - Margherita T. Cantorna
- Center for Molecular Immunology and Infectious Disease, Department of Veterinary and Biomedical Science, Pennsylvania State University, University Park, PA
| | - A. Catharine Ross
- Department of Nutritional Sciences,Center for Molecular Immunology and Infectious Disease, Department of Veterinary and Biomedical Science, Pennsylvania State University, University Park, PA,To whom correspondence should be addressed. E-mail:
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13
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Collins JW, Meganck JA, Kuo C, Francis KP, Frankel G. 4D multimodality imaging of Citrobacter rodentium infections in mice. J Vis Exp 2013. [PMID: 23979310 DOI: 10.3791/50450] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022] Open
Abstract
This protocol outlines the steps required to longitudinally monitor a bioluminescent bacterial infection using composite 3D diffuse light imaging tomography with integrated μCT (DLIT-μCT) and the subsequent use of this data to generate a four dimensional (4D) movie of the infection cycle. To develop the 4D infection movies and to validate the DLIT-μCT imaging for bacterial infection studies using an IVIS Spectrum CT, we used infection with bioluminescent C. rodentium, which causes self-limiting colitis in mice. In this protocol, we outline the infection of mice with bioluminescent C. rodentium and non-invasive monitoring of colonization by daily DLIT-μCT imaging and bacterial enumeration from feces for 8 days. The use of the IVIS Spectrum CT facilitates seamless co-registration of optical and μCT scans using a single imaging platform. The low dose μCT modality enables the imaging of mice at multiple time points during infection, providing detailed anatomical localization of bioluminescent bacterial foci in 3D without causing artifacts from the cumulative radiation. Importantly, the 4D movies of infected mice provide a powerful analytical tool to monitor bacterial colonization dynamics in vivo.
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Affiliation(s)
- James William Collins
- MRC Centre for Molecular Bacteriology and Infection, Division of Cell & Molecular Biology, Imperial College London
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