101
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Loke P, Lim YAL. Helminths and the microbiota: parts of the hygiene hypothesis. Parasite Immunol 2015; 37:314-23. [PMID: 25869420 DOI: 10.1111/pim.12193] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2014] [Accepted: 03/18/2015] [Indexed: 12/12/2022]
Abstract
In modern societies, diseases that are driven by dysregulated immune responses are increasing at an alarming pace, such as inflammatory bowel diseases and diabetes. There is an urgent need to understand these epidemiological trends, which are likely to be driven by the changing environment of the last few decades. There are complex interactions between human genetic factors and this changing environment that is leading to the increasing prevalence of metabolic and inflammatory diseases. Alterations to human gut bacterial communities (the microbiota) and lowered prevalence of helminth infections are potential environmental factors contributing to immune dysregulation. Helminths have co-evolved with the gut microbiota and their mammalian hosts. This three-way interaction is beginning to be characterized, and the knowledge gained may enable the design of new therapeutic strategies to treat metabolic and inflammatory diseases. However, these complex interactions need to be carefully investigated in the context of host genetic backgrounds to identify optimal treatment strategies. The complex nature of these interactions raises the possibility that only with highly personalized treatment, with knowledge of individual genetic and microbiota communities, will therapeutic interventions be successful for a majority of the individuals suffering from these complex diseases of immune dysregulation.
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Affiliation(s)
- P Loke
- Department of Microbiology, New York University School of Medicine, New York, NY, USA
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102
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Taniguchi T, Miyauchi E, Nakamura S, Hirai M, Suzue K, Imai T, Nomura T, Handa T, Okada H, Shimokawa C, Onishi R, Olia A, Hirata J, Tomita H, Ohno H, Horii T, Hisaeda H. Plasmodium berghei ANKA causes intestinal malaria associated with dysbiosis. Sci Rep 2015; 5:15699. [PMID: 26503461 PMCID: PMC4621605 DOI: 10.1038/srep15699] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2015] [Accepted: 09/14/2015] [Indexed: 12/22/2022] Open
Abstract
Gastrointestinal symptoms, such as abdominal pain and diarrhea, are frequently observed in patients with Plasmodium falciparum malaria. However, the correlation between malaria intestinal pathology and intestinal microbiota has not been investigated. In the present study, infection of C57BL/6 mice with P. berghei ANKA (PbA) caused intestinal pathological changes, such as detachment of epithelia in the small intestines and increased intestinal permeability, which correlated with development with experimental cerebral malaria (ECM). Notably, an apparent dysbiosis occurred, characterized by a reduction of Firmicutes and an increase in Proteobacteria. Furthermore, some genera of microbiota correlated with parasite growth and/or ECM development. By contrast, BALB/c mice are resistant to ECM and exhibit milder intestinal pathology and dysbiosis. These results indicate that the severity of cerebral and intestinal pathology coincides with the degree of alteration in microbiota. This is the first report demonstrating that malaria affects intestinal microbiota and causes dysbiosis.
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Affiliation(s)
- Tomoyo Taniguchi
- Department of Parasitology, Graduate School of Medicine, Gunma University, 3-39-22, Showa-machi, Maebashi, Gunma 371-8511, Japan.,Center for Medical Education, Graduate School of Medicine, Gunma University, 3-39-22, Showa-machi, Maebashi, Gunma 371-8511, Japan
| | - Eiji Miyauchi
- Laboratory for Intestinal Ecosystem, RIKEN Center for Integrative Medical Sciences (IMS), Yokohama, Kanagawa 230-0045, Japan
| | - Shota Nakamura
- Department of Genome Informatics, Research Institute for Microbial Diseases, Osaka University, Suita, Osaka 565-0871, Japan
| | - Makoto Hirai
- Department of Molecular and Cellular Parasitology, Juntendo University School of Medicine, Hongo, Bunkyo, Tokyo 113-8421, Japan
| | - Kazutomo Suzue
- Department of Parasitology, Graduate School of Medicine, Gunma University, 3-39-22, Showa-machi, Maebashi, Gunma 371-8511, Japan
| | - Takashi Imai
- Department of Parasitology, Graduate School of Medicine, Gunma University, 3-39-22, Showa-machi, Maebashi, Gunma 371-8511, Japan
| | - Takahiro Nomura
- Department of Bacteriology and Laboratory of Bacterial Drug Resistance, Gunma University Graduate School of Medicine, 3-39-22, Showa-machi, Maebashi, Gunma 371-8511, Japan
| | - Tadashi Handa
- Department of Diagnostic Pathology, Gunma University Graduate School of Medicine, 3-19-22, Showa-machi, Maebashi, Gunma, 371-8511, Japan
| | - Hiroko Okada
- Department of Parasitology, Graduate School of Medicine, Gunma University, 3-39-22, Showa-machi, Maebashi, Gunma 371-8511, Japan
| | - Chikako Shimokawa
- Department of Parasitology, Graduate School of Medicine, Gunma University, 3-39-22, Showa-machi, Maebashi, Gunma 371-8511, Japan
| | - Risa Onishi
- Department of Parasitology, Graduate School of Medicine, Gunma University, 3-39-22, Showa-machi, Maebashi, Gunma 371-8511, Japan
| | - Alex Olia
- Department of Parasitology, Graduate School of Medicine, Gunma University, 3-39-22, Showa-machi, Maebashi, Gunma 371-8511, Japan
| | - Jun Hirata
- Department of Parasitology, Graduate School of Medicine, Gunma University, 3-39-22, Showa-machi, Maebashi, Gunma 371-8511, Japan
| | - Haruyoshi Tomita
- Department of Bacteriology and Laboratory of Bacterial Drug Resistance, Gunma University Graduate School of Medicine, 3-39-22, Showa-machi, Maebashi, Gunma 371-8511, Japan
| | - Hiroshi Ohno
- Laboratory for Intestinal Ecosystem, RIKEN Center for Integrative Medical Sciences (IMS), Yokohama, Kanagawa 230-0045, Japan
| | - Toshihiro Horii
- Department of Molecular Protozoology, Research Institute for Microbial Diseases, Osaka University, Suita, Osaka 565-0871, Japan
| | - Hajime Hisaeda
- Department of Parasitology, Graduate School of Medicine, Gunma University, 3-39-22, Showa-machi, Maebashi, Gunma 371-8511, Japan
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103
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Zaiss MM, Rapin A, Lebon L, Dubey LK, Mosconi I, Sarter K, Piersigilli A, Menin L, Walker AW, Rougemont J, Paerewijck O, Geldhof P, McCoy KD, Macpherson AJ, Croese J, Giacomin PR, Loukas A, Junt T, Marsland BJ, Harris NL. The Intestinal Microbiota Contributes to the Ability of Helminths to Modulate Allergic Inflammation. Immunity 2015; 43:998-1010. [PMID: 26522986 PMCID: PMC4658337 DOI: 10.1016/j.immuni.2015.09.012] [Citation(s) in RCA: 294] [Impact Index Per Article: 32.7] [Reference Citation Analysis] [Abstract] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2014] [Revised: 07/12/2015] [Accepted: 09/28/2015] [Indexed: 12/14/2022]
Abstract
Intestinal helminths are potent regulators of their host’s immune system and can ameliorate inflammatory diseases such as allergic asthma. In the present study we have assessed whether this anti-inflammatory activity was purely intrinsic to helminths, or whether it also involved crosstalk with the local microbiota. We report that chronic infection with the murine helminth Heligmosomoides polygyrus bakeri (Hpb) altered the intestinal habitat, allowing increased short chain fatty acid (SCFA) production. Transfer of the Hpb-modified microbiota alone was sufficient to mediate protection against allergic asthma. The helminth-induced anti-inflammatory cytokine secretion and regulatory T cell suppressor activity that mediated the protection required the G protein-coupled receptor (GPR)-41. A similar alteration in the metabolic potential of intestinal bacterial communities was observed with diverse parasitic and host species, suggesting that this represents an evolutionary conserved mechanism of host-microbe-helminth interactions. The microbiota contributes to helminth-induced modulation of allergic asthma Cecal microbial communities are altered in helminth-infected mice Helminth infection increases microbial-derived short chain fatty acids GPR41 mediates helminth-induced Treg cell suppressor function
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Affiliation(s)
- Mario M Zaiss
- Global Health Institute, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne 1015, Switzerland
| | - Alexis Rapin
- Global Health Institute, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne 1015, Switzerland
| | - Luc Lebon
- Global Health Institute, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne 1015, Switzerland
| | - Lalit Kumar Dubey
- Global Health Institute, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne 1015, Switzerland
| | - Ilaria Mosconi
- Global Health Institute, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne 1015, Switzerland
| | - Kerstin Sarter
- Department of Pathology and Immunology, Faculty of Medicine, University of Geneva, Geneva 1211, Switzerland
| | - Alessandra Piersigilli
- Global Health Institute, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne 1015, Switzerland; Institute of Animal Pathology, Vetsuisse Faculty, University of Bern, Bern 3012, Switzerland
| | - Laure Menin
- Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne 1015, Switzerland
| | - Alan W Walker
- Pathogen Genomics Group, Wellcome Trust Sanger Institute, Hinxton, Cambridgeshire CB10 1SA, UK; Microbiology Group, Rowett Institute of Nutrition and Health, University of Aberdeen, Aberdeen AB21 9SB, UK
| | - Jacques Rougemont
- Bioinformatics and Biostatistics Core Facility, École Polytechnique Fédérale de Lausanne (EPFL) and Swiss Institute of Bioinformatics, Lausanne 1015, Switzerland
| | - Oonagh Paerewijck
- Department of Virology, Parasitology and Immunology, Ghent University, Salisburylaan 133, 9820 Merelbeke, Belgium
| | - Peter Geldhof
- Department of Virology, Parasitology and Immunology, Ghent University, Salisburylaan 133, 9820 Merelbeke, Belgium
| | - Kathleen D McCoy
- Maurice Müller Laboratories (DKF), University Hospital of Bern, Bern 3010, Switzerland
| | - Andrew J Macpherson
- Maurice Müller Laboratories (DKF), University Hospital of Bern, Bern 3010, Switzerland
| | - John Croese
- Department of Gastroenterology and Hepatology, The Prince Charles Hospital, Chermside, Brisbane, QLD 4032, Australia; Australian Institute of Tropical Health and Medicine, James Cook University, Cairns, QLD 4870, Australia
| | - Paul R Giacomin
- Australian Institute of Tropical Health and Medicine, James Cook University, Cairns, QLD 4870, Australia
| | - Alex Loukas
- Australian Institute of Tropical Health and Medicine, James Cook University, Cairns, QLD 4870, Australia
| | | | - Benjamin J Marsland
- Faculty of Biology and Medicine, University of Lausanne, Centre Hospitalier Universitaire Vaudois (CHUV), Lausanne 1011, Switzerland
| | - Nicola L Harris
- Global Health Institute, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne 1015, Switzerland.
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104
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Oral Administration of P. gingivalis Induces Dysbiosis of Gut Microbiota and Impaired Barrier Function Leading to Dissemination of Enterobacteria to the Liver. PLoS One 2015. [PMID: 26218067 PMCID: PMC4517782 DOI: 10.1371/journal.pone.0134234] [Citation(s) in RCA: 238] [Impact Index Per Article: 26.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Although periodontitis has been implicated as a risk factor for various systemic diseases, the precise mechanisms by which periodontitis induces systemic disease remain to be elucidated. We have previously revealed that repeated oral administration of Porphyromonas gingivalis elicits endotoxemia via changes in the gut microbiota of the ileum, and thereby induces systemic inflammation and insulin resistance. However, it is not clear to what extent a single administration of P. gingivalis could affect gut microbiota composition, gut barrier function, and subsequent influx of gut microbiota into the liver. Therefore, in the present study, C57BL/6 mice were orally administered P. gingivalis (strain W83) once and compared to sham-inoculated mice. The phylogenetic structure and diversity of microbial communities in the gut and liver were analyzed by pyrosequencing the 16S ribosomal RNA genes. Serum endotoxin activity was determined by a Limulus amebocyte lysate test. Gene expression in the intestine and expression of 16S rRNA genes in the blood and liver were examined by quantitative polymerase chain reaction. Administration of P. gingivalis significantly altered gut microbiota, with an increased proportion of phylum Bacteroidetes, a decreased proportion of phylum Firmicutes, and increased serum endotoxin levels. In the intestinal tissues, gene expression of tjp-1 and occludin, which are involved in intestinal permeability, were downregulated. Higher amounts of bacterial DNA were detected in the liver of infected mice. Importantly, changes in gut microbiota preceded systemic inflammatory changes. These results further support the idea that disturbance of the gut microbiota composition by orally derived periodontopathic bacteria may be a causal mechanism linking periodontitis and systemic disease.
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105
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Stiemsma LT, Reynolds LA, Turvey SE, Finlay BB. The hygiene hypothesis: current perspectives and future therapies. Immunotargets Ther 2015; 4:143-57. [PMID: 27471720 PMCID: PMC4918254 DOI: 10.2147/itt.s61528] [Citation(s) in RCA: 112] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Developed countries have experienced a steady increase in atopic disease and disorders of immune dysregulation since the 1980s. This increase parallels a decrease in infectious diseases within the same time period, while developing countries seem to exhibit the opposite effect, with less immune dysregulation and a higher prevalence of infectious disease. The “hygiene hypothesis”, proposed by Strachan in 1989, aimed to explain this peculiar generational rise in immune dysregulation. However, research over the past 10 years provides evidence connecting the commensal and symbiotic microbes (intestinal microbiota) and parasitic helminths with immune development, expanding the hygiene hypothesis into the “microflora” and “old friends” hypotheses, respectively. There is evidence that parasitic helminths and commensal microbial organisms co-evolved with the human immune system and that these organisms are vital in promoting normal immune development. Current research supports the potential for manipulation of the bacterial intestinal microbiota to treat and even prevent immune dysregulation in the form of atopic disease and other immune-mediated disorders (namely inflammatory bowel disease and type 1 diabetes). Both human and animal model research are crucial in understanding the mechanistic links between these intestinal microbes and helminth parasites, and the human immune system. Pro-, pre-, and synbiotic, as well as treatment with live helminth and excretory/secretory helminth product therapies, are all potential therapeutic options for the treatment and prevention of these diseases. In the future, therapeutics aimed at decreasing the prevalence of inflammatory bowel disease, type 1 diabetes, and atopic disorders will likely involve personalized microbiota and/or helminth treatments used early in life.
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Affiliation(s)
- Leah T Stiemsma
- Department of Microbiology & Immunology, University of British Columbia, Vancouver, BC, Canada; The Child and Family Research Institute, University of British Columbia, Vancouver, BC, Canada
| | - Lisa A Reynolds
- Michael Smith Laboratories, University of British Columbia, Vancouver, BC, Canada
| | - Stuart E Turvey
- Department of Microbiology & Immunology, University of British Columbia, Vancouver, BC, Canada; The Child and Family Research Institute, University of British Columbia, Vancouver, BC, Canada; Department of Pediatrics, University of British Columbia, Vancouver, BC, Canada
| | - B Brett Finlay
- Department of Microbiology & Immunology, University of British Columbia, Vancouver, BC, Canada; Michael Smith Laboratories, University of British Columbia, Vancouver, BC, Canada; Department of Biochemistry and Molecular Biology, University of British Columbia, Vancouver, BC, Canada
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106
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Vejzagić N, Adelfio R, Keiser J, Kringel H, Thamsborg SM, Kapel CMO. Bacteria-induced egg hatching differs for Trichuris muris and Trichuris suis. Parasit Vectors 2015; 8:371. [PMID: 26174801 PMCID: PMC4501204 DOI: 10.1186/s13071-015-0986-z] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2015] [Accepted: 07/06/2015] [Indexed: 12/26/2022] Open
Abstract
Background Eggs of the porcine whipworm Trichuris suis are currently explored in human clinical trials as a treatment of immune-mediated diseases. In this context, only the infective, embryonated eggs, constitute the Active Pharmaceutical Ingredient (API). The rodent whipworm, Trichuris muris is commonly used as a laboratory model to study Trichuris biology. The embryonated eggs (containing a fully developed larva) are biologically active and will invade the large intestinal mucosa of the host. This study aims to assess the in vitro hatching of T. muris and T. suis eggs in various bacterial cultures as a measure for their biological activity. Methods Eggs of T. muris and T. suis were incubated with Escherichia coli strain (BL-21) at three concentrations in a slightly modified in vitro egg hatching assay previously developed for T. muris. Additionally, E. coli strains (M15, SG13009, PMC103, JM109, TUNER, DH5alpha, TOP10) and five Gram-positive bacteria (Enterococcus caccae, Streptococcus hyointestinalis, Lactobacillus amylovorus, L. murinus, and L. reuteri) were tested as a hatching stimulus for T. muris and T. suis eggs. Results Whereas T. muris eggs hatched, T. suis did not, even when exposed to different concentrations and strains of E. coli after 4 and 24-hour incubation. When incubated with Gram-positive bacteria, only T. muris eggs showed noticeable hatching after 20 h, although with high variability. Conclusions The observed difference in hatching of T. muris and T. suis eggs incubated with selected bacteria, indicate significant biological differences which may reflect specific adaptation to different host-specific gut microbiota.
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Affiliation(s)
- Nermina Vejzagić
- Section for Organismal Biology, Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Frederiksberg C, Denmark.
| | - Roberto Adelfio
- Medical Parasitology and Infection Biology, Swiss Tropical and Public Health Institute, Basel, Switzerland. .,University of Basel, Basel, Switzerland.
| | - Jennifer Keiser
- Medical Parasitology and Infection Biology, Swiss Tropical and Public Health Institute, Basel, Switzerland. .,University of Basel, Basel, Switzerland.
| | | | - Stig Milan Thamsborg
- Parasite Technologies A/S, Hørsholm, Denmark. .,Parasitology and Aquatic Diseases, Department of Veterinary Disease Biology, Faculty of Health and Medical Sciences, University of Copenhagen, Frederiksberg C, Denmark.
| | - Christian M O Kapel
- Section for Organismal Biology, Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Frederiksberg C, Denmark. .,Parasite Technologies A/S, Hørsholm, Denmark.
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107
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Erickson NA, Nyström EEL, Mundhenk L, Arike L, Glauben R, Heimesaat MM, Fischer A, Bereswill S, Birchenough GMH, Gruber AD, Johansson MEV. The Goblet Cell Protein Clca1 (Alias mClca3 or Gob-5) Is Not Required for Intestinal Mucus Synthesis, Structure and Barrier Function in Naive or DSS-Challenged Mice. PLoS One 2015; 10:e0131991. [PMID: 26162072 PMCID: PMC4498832 DOI: 10.1371/journal.pone.0131991] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2015] [Accepted: 06/09/2015] [Indexed: 12/15/2022] Open
Abstract
The secreted, goblet cell-derived protein Clca1 (chloride channel regulator, calcium-activated-1) has been linked to diseases with mucus overproduction, including asthma and cystic fibrosis. In the intestine Clca1 is found in the mucus with an abundance and expression pattern similar to Muc2, the major structural mucus component. We hypothesized that Clca1 is required for the synthesis, structure or barrier function of intestinal mucus and therefore compared wild type and Clca1-deficient mice under naive and at various time points of DSS (dextran sodium sulfate)-challenged conditions. The mucus phenotype in Clca1-deficient compared to wild type mice was systematically characterized by assessment of the mucus protein composition using proteomics, immunofluorescence and expression analysis of selected mucin genes on mRNA level. Mucus barrier integrity was assessed in-vivo by analysis of bacterial penetration into the mucus and translocation into sentinel organs combined analysis of the fecal microbiota and ex-vivo by assessment of mucus penetrability using beads. All of these assays revealed no relevant differences between wild type and Clca1-deficient mice under steady state or DSS-challenged conditions in mouse colon. Clca1 is not required for mucus synthesis, structure and barrier function in the murine colon.
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Affiliation(s)
- Nancy A. Erickson
- Department of Veterinary Pathology, Freie Universität Berlin, Berlin, Germany
| | | | - Lars Mundhenk
- Department of Veterinary Pathology, Freie Universität Berlin, Berlin, Germany
| | - Liisa Arike
- Department of Medical Biochemistry, University of Gothenburg, Gothenburg, Sweden
| | - Rainer Glauben
- Medical Department, Division of Gastroenterology, Infectiology and Rheumatology—Charité, Universitätsmedizin Berlin, Berlin, Germany
| | - Markus M. Heimesaat
- Department of Microbiology and Hygiene, Charité - Universitätsmedizin Berlin, Berlin, Germany
| | - André Fischer
- Department of Microbiology and Hygiene, Charité - Universitätsmedizin Berlin, Berlin, Germany
| | - Stefan Bereswill
- Department of Microbiology and Hygiene, Charité - Universitätsmedizin Berlin, Berlin, Germany
| | | | - Achim D. Gruber
- Department of Veterinary Pathology, Freie Universität Berlin, Berlin, Germany
| | - Malin E. V. Johansson
- Department of Medical Biochemistry, University of Gothenburg, Gothenburg, Sweden
- * E-mail:
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108
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Maurice CF, Knowles SCL, Ladau J, Pollard KS, Fenton A, Pedersen AB, Turnbaugh PJ. Marked seasonal variation in the wild mouse gut microbiota. ISME JOURNAL 2015; 9:2423-34. [PMID: 26023870 PMCID: PMC4611506 DOI: 10.1038/ismej.2015.53] [Citation(s) in RCA: 237] [Impact Index Per Article: 26.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/16/2014] [Revised: 02/10/2015] [Accepted: 03/04/2015] [Indexed: 12/30/2022]
Abstract
Recent studies have provided an unprecedented view of the microbial communities colonizing captive mice; yet the host and environmental factors that shape the rodent gut microbiota in their natural habitat remain largely unexplored. Here, we present results from a 2-year 16 S ribosomal RNA gene sequencing-based survey of wild wood mice (Apodemus sylvaticus) in two nearby woodlands. Similar to other mammals, wild mice were colonized by 10 bacterial phyla and dominated by the Firmicutes, Bacteroidetes and Proteobacteria. Within the Firmicutes, the Lactobacillus genus was most abundant. Putative bacterial pathogens were widespread and often abundant members of the wild mouse gut microbiota. Among a suite of extrinsic (environmental) and intrinsic (host-related) factors examined, seasonal changes dominated in driving qualitative and quantitative differences in the gut microbiota. In both years examined, we observed a strong seasonal shift in gut microbial community structure, potentially due to the transition from an insect- to a seed-based diet. This involved decreased levels of Lactobacillus, and increased levels of Alistipes (Bacteroidetes phylum) and Helicobacter. We also detected more subtle but statistically significant associations between the gut microbiota and biogeography, sex, reproductive status and co-colonization with enteric nematodes. These results suggest that environmental factors have a major role in shaping temporal variations in microbial community structure within natural populations.
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Affiliation(s)
- Corinne F Maurice
- FAS Center for Systems Biology, Harvard University, Cambridge, MA, USA
| | - Sarah C L Knowles
- Centre for Immunity, Infection and Evolution (CIIE), School of Biological Sciences, University of Edinburgh, Edinburgh, UK.,Department of Life Sciences, Imperial College London, Silwood Park Campus, Buckhurst Road, Ascot, Berkshire, UK
| | | | - Katherine S Pollard
- Gladstone Institutes, San Francisco, CA, USA.,Institute for Human Genetics and Division of Biostatistics, University of California San Francisco, San Francisco, CA, USA
| | - Andy Fenton
- Institute of Integrative Biology, University of Liverpool, Biosciences Building, Liverpool, UK
| | - Amy B Pedersen
- Centre for Immunity, Infection and Evolution (CIIE), School of Biological Sciences, University of Edinburgh, Edinburgh, UK
| | - Peter J Turnbaugh
- FAS Center for Systems Biology, Harvard University, Cambridge, MA, USA.,Department of Microbiology and Immunology, G.W. Hooper Research Foundation, University of California San Francisco, San Francisco, CA, USA
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109
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Vejzagić N, Thamsborg SM, Kringel H, Roepstorff A, Bruun JM, Kapel CMO. In vitro hatching of Trichuris suis eggs. Parasitol Res 2015; 114:2705-14. [PMID: 26008635 DOI: 10.1007/s00436-015-4476-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2015] [Accepted: 04/08/2015] [Indexed: 01/10/2023]
Abstract
Eggs of the pig whipworm, Trichuris suis ova (TSO), are currently tested in human clinical trials for their potential immunomodulatory capacity. The biological potency of TSO (egg viability and infectivity) is traditionally assessed in Göttingen minipigs as the establishment of intestinal larvae after inoculation with a known number of eggs. To minimize testing in animal models, development of an in vitro egg hatching assay is proposed as a reliable, cost-effective, and a faster alternative to test the egg viability. The present study aimed to investigate the influence of different chemical, physical, and biological factors on egg hatching. Thus, in a series of experiments and in different combinations, the eggs were stimulated with glass beads, artificial gastric juice, bile salt and trypsin solution, fermentation gut medium, or stimulated with mucosal scrapings from the ileum and the large intestine of the infected and uninfected Göttingen minipig. Mechanical stimulation with glass beads presented a simple and reproducible method for egg hatching. However, incubation of eggs with mucosal scrapings from the ileum, caecum, and colon for 24 h at 38 °C significantly increased hatching.
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Affiliation(s)
- Nermina Vejzagić
- Section for Organismal Biology, Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Thorvaldsensvej 40, 1871, Frederiksberg C, Denmark,
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110
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Holm JB, Sorobetea D, Kiilerich P, Ramayo-Caldas Y, Estellé J, Ma T, Madsen L, Kristiansen K, Svensson-Frej M. Chronic Trichuris muris Infection Decreases Diversity of the Intestinal Microbiota and Concomitantly Increases the Abundance of Lactobacilli. PLoS One 2015; 10:e0125495. [PMID: 25942314 PMCID: PMC4420551 DOI: 10.1371/journal.pone.0125495] [Citation(s) in RCA: 133] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2015] [Accepted: 03/13/2015] [Indexed: 12/26/2022] Open
Abstract
The intestinal microbiota is vital for shaping the local intestinal environment as well as host immunity and metabolism. At the same time, epidemiological and experimental evidence suggest an important role for parasitic worm infections in maintaining the inflammatory and regulatory balance of the immune system. In line with this, the prevalence of persistent worm infections is inversely correlated with the incidence of immune-associated diseases, prompting the use of controlled parasite infections for therapeutic purposes. Despite this, the impact of parasite infection on the intestinal microbiota, as well as potential downstream effects on the immune system, remain largely unknown. We have assessed the influence of chronic infection with the large-intestinal nematode Trichuris muris, a close relative of the human pathogen Trichuris trichiura, on the composition of the murine intestinal microbiota by 16S ribosomal-RNA gene-based sequencing. Our results demonstrate that persistent T. muris infection dramatically affects the large-intestinal microbiota, most notably with a drop in the diversity of bacterial communities, as well as a marked increase in the relative abundance of the Lactobacillus genus. In parallel, chronic T. muris infection resulted in a significant shift in the balance between regulatory and inflammatory T cells in the intestinal adaptive immune system, in favour of inflammatory cells. Together, these data demonstrate that chronic parasite infection strongly influences the intestinal microbiota and the adaptive immune system. Our results illustrate the complex interactions between these factors in the intestinal tract, and contribute to furthering the understanding of this interplay, which is of crucial importance considering that 500 million people globally are suffering from these infections and their potential use for therapeutic purposes.
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Affiliation(s)
- Jacob Bak Holm
- Laboratory of Genomics and Molecular Biomedicine, Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | - Daniel Sorobetea
- Immunology Section, Department of Experimental Medical Sciences, Medical Faculty, Lund University, Lund, Sweden
| | - Pia Kiilerich
- Laboratory of Genomics and Molecular Biomedicine, Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | | | - Jordi Estellé
- INRA, UMR1313 Génétique Animale et Biologie Intégrative (GABI), Jouy-en-Josas, France
| | - Tao Ma
- Laboratory of Genomics and Molecular Biomedicine, Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | - Lise Madsen
- Laboratory of Genomics and Molecular Biomedicine, Department of Biology, University of Copenhagen, Copenhagen, Denmark; National Institute of Nutrition and Seafood Research, Bergen, Norway
| | - Karsten Kristiansen
- Laboratory of Genomics and Molecular Biomedicine, Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | - Marcus Svensson-Frej
- Immunology Section, Department of Experimental Medical Sciences, Medical Faculty, Lund University, Lund, Sweden
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Johnston CJC, Robertson E, Harcus Y, Grainger JR, Coakley G, Smyth DJ, McSorley HJ, Maizels R. Cultivation of Heligmosomoides polygyrus: an immunomodulatory nematode parasite and its secreted products. J Vis Exp 2015:e52412. [PMID: 25867600 PMCID: PMC4401400 DOI: 10.3791/52412] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Heligmosomoides polygyrus (formerly known as Nematospiroides dubius, and also referred to by some as H. bakeri) is a gastrointestinal helminth that employs multiple immunomodulatory mechanisms to establish chronic infection in mice and closely resembles prevalent human helminth infections. H. polygyrus has been studied extensively in the field of helminth-derived immune regulation and has been found to potently suppress experimental models of allergy and autoimmunity (both with active infection and isolated secreted products). The protocol described in this paper outlines management of the H. polygyrus life cycle for consistent production of L3 larvae, recovery of adult parasites, and collection of their excretory-secretory products (HES).
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Affiliation(s)
| | - Elaine Robertson
- Institute of Immunology and Infection Research, University of Edinburgh
| | - Yvonne Harcus
- Institute of Immunology and Infection Research, University of Edinburgh
| | | | - Gillian Coakley
- Institute of Immunology and Infection Research, University of Edinburgh
| | - Danielle J Smyth
- Institute of Immunology and Infection Research, University of Edinburgh
| | - Henry J McSorley
- Institute of Immunology and Infection Research, University of Edinburgh
| | - Rick Maizels
- Institute of Immunology and Infection Research, University of Edinburgh;
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112
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Grencis RK. Immunity to Helminths: Resistance, Regulation, and Susceptibility to Gastrointestinal Nematodes. Annu Rev Immunol 2015; 33:201-25. [DOI: 10.1146/annurev-immunol-032713-120218] [Citation(s) in RCA: 141] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Richard K. Grencis
- Faculty of Life Sciences, University of Manchester, Manchester M13 9PT, United Kingdom;
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113
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Xu C, Liu Q, Huan F, Qu J, Liu W, Gu A, Wang Y, Jiang Z. Changes in Gut Microbiota May Be Early Signs of Liver Toxicity Induced by Epoxiconazole in Rats. Chemotherapy 2015; 60:135-142. [PMID: 25766299 DOI: 10.1159/000371837] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2014] [Accepted: 01/05/2015] [Indexed: 11/19/2022]
Abstract
OBJECTIVE The gut microbiome is essential for human health due to its effects on disease development, drug metabolism and the immune system. It may also play a role in the interaction with environmental toxicants. However, the effect of epoxiconazole, a fungicide active ingredient from the class of azoles developed to protect crops, on the abundance and composition of the gut microbiome has never been studied. We put forward the hypothesis that changes in gut microbiota may be early signs of toxicity induced by epoxiconazole. METHODS In this study, female rats were fed with epoxiconazole-adulterated diets (0, 4 and 100 mg/kg/day) for 90 days. The gut microbiome was determined by 16S rRNA gene sequencing. Body and organ weight, and blood biochemistry were also measured after 90 days of oral epoxiconazole exposure. RESULTS Interestingly, the abundance of gut Firmicutes decreased, and Bacteroidetes and Proteobacteria increased. At family level, Lachnospiraceae and Enterobacteriaceae were selectively enriched following epoxiconazole exposure. Our results indicate that epoxiconazole exposure may induce changes in the gut microbiome and potential liver toxicity. CONCLUSION Changes in the gut microbiome may be used as early indicators for monitoring the health risk of the host.
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114
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Grencis RK, Humphreys NE, Bancroft AJ. Immunity to gastrointestinal nematodes: mechanisms and myths. Immunol Rev 2015; 260:183-205. [PMID: 24942690 PMCID: PMC4141702 DOI: 10.1111/imr.12188] [Citation(s) in RCA: 86] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Immune responses to gastrointestinal nematodes have been studied extensively for over 80 years and intensively investigated over the last 30–40 years. The use of laboratory models has led to the discovery of new mechanisms of protective immunity and made major contributions to our fundamental understanding of both innate and adaptive responses. In addition to host protection, it is clear that immunoregulatory processes are common in infected individuals and resistance often operates alongside modulation of immunity. This review aims to discuss the recent discoveries in both host protection and immunoregulation against gastrointestinal nematodes, placing the data in context of the specific life cycles imposed by the different parasites studied and the future challenges of considering the mucosal/immune axis to encompass host, parasite, and microbiome in its widest sense.
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Thoene-Reineke C, Fischer A, Friese C, Briesemeister D, Göbel UB, Kammertoens T, Bereswill S, Heimesaat MM. Composition of intestinal microbiota in immune-deficient mice kept in three different housing conditions. PLoS One 2014; 9:e113406. [PMID: 25401702 PMCID: PMC4234647 DOI: 10.1371/journal.pone.0113406] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2014] [Accepted: 10/23/2014] [Indexed: 01/01/2023] Open
Abstract
BACKGROUND Abundance of commensals constituting the intestinal microbiota (IM) affects the immune system and predisposes to a variety of diseases, including intestinal infections, cancer, inflammatory and metabolic disorders. Housing conditions determine the IM and can hence influence the immune system. We analyzed how both variables affect the IM of four immune-compromized mouse lines kept under different housing conditions. METHODOLOGY/PRINCIPAL FINDINGS We investigated the IM composition in mice by quantitative 16S rRNA RT-PCR analysis of the main fecal bacterial groups (Enterobacteriaceae, enterococci, lactobacilli, bifidobacteria, Bacteroides/Prevotella (BP) spp., Clostridium leptum and coccoides groups). Mice were homozygous (HO) or heterozygous (HE) for a targeted inactivating mutation of either the IFN-γ Receptor (R), IFN-γ, Rag1 or IL-4 genes. Overall, differences in IM composition were subtle. However, in the SPF-barrier, total eubacterial loads were higher in Rag1 HE versus Rag1 HO mice as well as in IFN-γR HE versus IFN-γR HO and WT animals. Although absent in WT mice, bifidobacterial loads were higher in HO and HE IFN-γ and Rag1 as well as IL-4 HO mice. Furthermore, BP was slightly lower in HO and HE IFN-γR and IFN-γ mice as well as in IL-4 HO mice as compared to WT controls. Interestingly, IM compositions were comparable in WT mice when kept in individual ventilated cages (IVC) or open cages (OC). IFN-γ HO and HE mice, however, had higher enterobacteria and BP loads, but lacked bifidobacteria when kept in OC versus IVC, as was the case in HO and HE Rag1 mice. In addition, Rag1 HO mice harbored higher clostridial loads when housed in OC as compared to IVC. Unexpectedly, lactobacilli levels were higher in IFN-γR mice when kept in OC versus IVC. CONCLUSION/SIGNIFICANCE Housing-dependent and immune-deficiency mediated changes in intestinal microbiota composition were rather subtle but may nevertheless impact immunopathology in experimental models.
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Affiliation(s)
- Christa Thoene-Reineke
- Forschungseinrichtung für Experimentelle Medizin, Charité - University Medicine Berlin, Berlin, Germany
| | - André Fischer
- Department of Microbiology and Hygiene, Charité - University Medicine Berlin, Berlin, Germany
| | - Christian Friese
- Department of Immunology, Charité - University Medicine Berlin, Berlin, Germany
| | - Dana Briesemeister
- Department of Immunology, Charité - University Medicine Berlin, Berlin, Germany
| | - Ulf B. Göbel
- Department of Microbiology and Hygiene, Charité - University Medicine Berlin, Berlin, Germany
| | - Thomas Kammertoens
- Department of Immunology, Charité - University Medicine Berlin, Berlin, Germany
| | - Stefan Bereswill
- Department of Microbiology and Hygiene, Charité - University Medicine Berlin, Berlin, Germany
| | - Markus M. Heimesaat
- Department of Microbiology and Hygiene, Charité - University Medicine Berlin, Berlin, Germany
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116
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Heimesaat MM, Dunay IR, Alutis M, Fischer A, Möhle L, Göbel UB, Kühl AA, Bereswill S. Nucleotide-oligomerization-domain-2 affects commensal gut microbiota composition and intracerebral immunopathology in acute Toxoplasma gondii induced murine ileitis. PLoS One 2014; 9:e105120. [PMID: 25141224 PMCID: PMC4139296 DOI: 10.1371/journal.pone.0105120] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2014] [Accepted: 07/18/2014] [Indexed: 01/01/2023] Open
Abstract
Background Within one week following peroral high dose infection with Toxoplasma (T.) gondii, susceptible mice develop non-selflimiting acute ileitis due to an underlying Th1-type immunopathology. The role of the innate immune receptor nucleotide-oligomerization-domain-2 (NOD2) in mediating potential extra-intestinal inflammatory sequelae including the brain, however, has not been investigated so far. Methodology/Principal Findings Following peroral infection with 100 cysts of T. gondii strain ME49, NOD2-/- mice displayed more severe ileitis and higher small intestinal parasitic loads as compared to wildtype (WT) mice. However, systemic (i.e. splenic) levels of pro-inflammatory cytokines such as TNF-α and IFN-γ were lower in NOD2-/- mice versus WT controls at day 7 p.i. Given that the immunopathological outcome might be influenced by the intestinal microbiota composition, which is shaped by NOD2, we performed a quantitative survey of main intestinal bacterial groups by 16S rRNA analysis. Interestingly, Bifidobacteria were virtually absent in NOD2-/- but not WT mice, whereas differences in remaining bacterial species were rather subtle. Interestingly, more distinct intestinal inflammation was accompanied by higher bacterial translocation rates to extra-intestinal tissue sites such as liver, spleen, and kidneys in T. gondii infected NOD2-/- mice. Strikingly, intracerebral inflammatory foci could be observed as early as seven days following T. gondii infection irrespective of the genotype of animals, whereas NOD2-/- mice exhibited higher intracerebral parasitic loads, higher F4/80 positive macrophage and microglia numbers as well as higher IFN-γ mRNA expression levels as compared to WT control animals. Conclusion/Significance NOD2 signaling is involved in protection of mice from T. gondii induced acute ileitis. The parasite-induced Th1-type immunopathology at intestinal as well as extra-intestinal sites including the brain is modulated in a NOD2-dependent manner.
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Affiliation(s)
- Markus M. Heimesaat
- Department of Microbiology and Hygiene, Charité - University Medicine Berlin, Berlin, Germany
- * E-mail:
| | - Ildiko R. Dunay
- Department of Microbiology and Hygiene, University of Magdeburg, Magdeburg, Germany
| | - Marie Alutis
- Department of Microbiology and Hygiene, Charité - University Medicine Berlin, Berlin, Germany
| | - André Fischer
- Department of Microbiology and Hygiene, Charité - University Medicine Berlin, Berlin, Germany
| | - Luisa Möhle
- Department of Microbiology and Hygiene, University of Magdeburg, Magdeburg, Germany
| | - Ulf B. Göbel
- Department of Microbiology and Hygiene, Charité - University Medicine Berlin, Berlin, Germany
| | - Anja A. Kühl
- Department of Internal Medicine, Rheumatology and Clinical Immunology/Research Center ImmunoSciences (RCIS), Charité - University Medicine Berlin, Berlin, Germany
| | - Stefan Bereswill
- Department of Microbiology and Hygiene, Charité - University Medicine Berlin, Berlin, Germany
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117
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Affiliation(s)
- Rick M Maizels
- Institute for Immunology and Infection Research and Centre for Immunity, Infection and Evolution, University of Edinburgh, Edinburgh, UK.
| | - William C Gause
- Center for Immunity and Inflammation,Department of Medicine, New Jersey Medical School,Rutgers-the State University of New Jersey, Newark, NJ, USA
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118
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Osborne LC, Monticelli LA, Nice TJ, Sutherland TE, Siracusa MC, Hepworth MR, Tomov VT, Kobuley D, Tran SV, Bittinger K, Bailey AG, Laughlin AL, Boucher JL, Wherry EJ, Bushman FD, Allen JE, Virgin HW, Artis D. Coinfection. Virus-helminth coinfection reveals a microbiota-independent mechanism of immunomodulation. Science 2014; 345:578-82. [PMID: 25082704 DOI: 10.1126/science.1256942] [Citation(s) in RCA: 211] [Impact Index Per Article: 21.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The mammalian intestine is colonized by beneficial commensal bacteria and is a site of infection by pathogens, including helminth parasites. Helminths induce potent immunomodulatory effects, but whether these effects are mediated by direct regulation of host immunity or indirectly through eliciting changes in the microbiota is unknown. We tested this in the context of virus-helminth coinfection. Helminth coinfection resulted in impaired antiviral immunity and was associated with changes in the microbiota and STAT6-dependent helminth-induced alternative activation of macrophages. Notably, helminth-induced impairment of antiviral immunity was evident in germ-free mice, but neutralization of Ym1, a chitinase-like molecule that is associated with alternatively activated macrophages, could partially restore antiviral immunity. These data indicate that helminth-induced immunomodulation occurs independently of changes in the microbiota but is dependent on Ym1.
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Affiliation(s)
- Lisa C Osborne
- Department of Microbiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA. Institute for Immunology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Laurel A Monticelli
- Department of Microbiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA. Institute for Immunology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Timothy J Nice
- Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Tara E Sutherland
- Institute of Immunology and Infection Research, Centre for Immunity, Infection and Evolution, School of Biological Sciences, University of Edinburgh, Edinburgh EH9 3JT, UK
| | - Mark C Siracusa
- Department of Microbiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA. Institute for Immunology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Matthew R Hepworth
- Department of Microbiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA. Institute for Immunology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA. Department of Medicine, Division of Gastroenterology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Vesselin T Tomov
- Department of Medicine, Division of Gastroenterology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Dmytro Kobuley
- Department of Microbiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA. Institute for Immunology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Sara V Tran
- Department of Microbiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA. Institute for Immunology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Kyle Bittinger
- Department of Microbiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Aubrey G Bailey
- Department of Microbiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Alice L Laughlin
- Department of Microbiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Jean-Luc Boucher
- Laboratoire de Chimie et Biochimie Pharmacologiques et Toxicologiques, Université Paris Descartes, Paris, France
| | - E John Wherry
- Institute for Immunology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Frederic D Bushman
- Department of Microbiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Judith E Allen
- Institute of Immunology and Infection Research, Centre for Immunity, Infection and Evolution, School of Biological Sciences, University of Edinburgh, Edinburgh EH9 3JT, UK
| | - Herbert W Virgin
- Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - David Artis
- Department of Microbiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA. Institute for Immunology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA. Department of Pathobiology, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA.
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Reynolds LA, Smith KA, Filbey KJ, Harcus Y, Hewitson JP, Redpath SA, Valdez Y, Yebra MJ, Finlay BB, Maizels RM. Commensal-pathogen interactions in the intestinal tract: lactobacilli promote infection with, and are promoted by, helminth parasites. Gut Microbes 2014; 5:522-32. [PMID: 25144609 PMCID: PMC4822684 DOI: 10.4161/gmic.32155] [Citation(s) in RCA: 185] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
The intestinal microbiota are pivotal in determining the developmental, metabolic and immunological status of the mammalian host. However, the intestinal tract may also accommodate pathogenic organisms, including helminth parasites which are highly prevalent in most tropical countries. Both microbes and helminths must evade or manipulate the host immune system to reside in the intestinal environment, yet whether they influence each other's persistence in the host remains unknown. We now show that abundance of Lactobacillus bacteria correlates positively with infection with the mouse intestinal nematode parasite, Heligmosomoides polygyrus, as well as with heightened regulatory T cell (Treg) and Th17 responses. Moreover, H. polygyrus raises Lactobacillus species abundance in the duodenum of C57BL/6 mice, which are highly susceptible to H. polygyrus infection, but not in BALB/c mice, which are relatively resistant. Sequencing of samples at the bacterial gyrB locus identified the principal Lactobacillus species as L. taiwanensis, a previously characterized rodent commensal. Experimental administration of L. taiwanensis to BALB/c mice elevates regulatory T cell frequencies and results in greater helminth establishment, demonstrating a causal relationship in which commensal bacteria promote infection with an intestinal parasite and implicating a bacterially-induced expansion of Tregs as a mechanism of greater helminth susceptibility. The discovery of this tripartite interaction between host, bacteria and parasite has important implications for both antibiotic and anthelmintic use in endemic human populations.
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Affiliation(s)
- Lisa A Reynolds
- Centre for Immunity, Infection and Evolution, and Institute of Immunology and Infection Research; Ashworth Laboratories; University of Edinburgh; Edinburgh, UK
- Michael Smith Laboratories; University of British Columbia; Vancouver, BC Canada
| | - Katherine A Smith
- Centre for Immunity, Infection and Evolution, and Institute of Immunology and Infection Research; Ashworth Laboratories; University of Edinburgh; Edinburgh, UK
| | - Kara J Filbey
- Centre for Immunity, Infection and Evolution, and Institute of Immunology and Infection Research; Ashworth Laboratories; University of Edinburgh; Edinburgh, UK
| | - Yvonne Harcus
- Centre for Immunity, Infection and Evolution, and Institute of Immunology and Infection Research; Ashworth Laboratories; University of Edinburgh; Edinburgh, UK
| | - James P Hewitson
- Centre for Immunity, Infection and Evolution, and Institute of Immunology and Infection Research; Ashworth Laboratories; University of Edinburgh; Edinburgh, UK
| | - Stephen A Redpath
- Department of Microbiology and Immunology; University of British Columbia; Vancouver, BC Canada
| | - Yanet Valdez
- Michael Smith Laboratories; University of British Columbia; Vancouver, BC Canada
| | - María J Yebra
- Laboratorio de Bacterias Lácticas y Probióticos; Instituto de Agroquímica y Tecnología de los Alimentos; IATA-CSIC; Valencia, Spain
| | - B Brett Finlay
- Michael Smith Laboratories; University of British Columbia; Vancouver, BC Canada
- Department of Microbiology and Immunology; University of British Columbia; Vancouver, BC Canada
- Department of Biochemistry and Molecular Biology; University of British Columbia; Vancouver, BC Canada
| | - Rick M Maizels
- Centre for Immunity, Infection and Evolution, and Institute of Immunology and Infection Research; Ashworth Laboratories; University of Edinburgh; Edinburgh, UK
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Bereswill S, Kühl AA, Alutis M, Fischer A, Möhle L, Struck D, Liesenfeld O, Göbel UB, Dunay IR, Heimesaat MM. The impact of Toll-like-receptor-9 on intestinal microbiota composition and extra-intestinal sequelae in experimental Toxoplasma gondii induced ileitis. Gut Pathog 2014; 6:19. [PMID: 24932221 PMCID: PMC4057803 DOI: 10.1186/1757-4749-6-19] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/14/2014] [Accepted: 05/26/2014] [Indexed: 01/01/2023] Open
Abstract
Background Following peroral Toxoplasma (T.) gondii infection, susceptible mice develop acute ileitis due to a microbiota-dependent Th1 type immunopathology. Toll-like-receptor (TLR)-9 is known to recognize bacterial DNA and mediates intestinal inflammation, but its impact on intestinal microbiota composition and extra-intestinal sequelae following T. gondii infection has not yet been elucidated. Methods and results Seven days following peroral infection (p.i.) with 100 cysts of T. gondii ME49 strain, TLR-9-/- and wildtype (WT) mice suffered from comparable ileitis, whereas ileal parasitic loads as well as IFN-γ and nitric oxide levels were higher in TLR-9-/- compared to WT mice. Locally, TLR-9-/- mice exhibited increased ileal CD3+, but not FOXP3+ cell numbers at day 7 p.i.; in mesenteric lymph nodes IFN-γ-producing CD4+ cell numbers and TNF-α and IFN-γ concentrations were also increased in TLR-9-/- compared to WT mice. T. gondii DNA levels, however, did not differ in mice of either genotype. Differences in intestinal microbiota were rather subtle except for bifidobacteria that were virtually absent in both, naïve and T. gondii infected TLR-9-/-, but not WT mice. Extra-intestinally, TLR-9-/- mice displayed less distinct systemic immune responses as indicated by lower serum IL-6, and splenic TNF-α and IFN-γ levels as compared to WT mice despite higher translocation rates of intestinal bacteria to extra-intestinal compartments such as liver, spleen, kidney, and cardiac blood. Most importantly, brains were also affected in this inflammatory scenario as early as day 7 p.i. Remarkably, TLR-9-/- mice exhibited more pronounced inflammatory infiltrates with higher numbers of F4/80+ macrophages and microglia in the cortex and meninges as compared to WT mice, whereas T. gondii DNA levels did not differ. Conclusion We here show that TLR-9 is not required for the development of T. gondii induced ileitis but mediates distinct inflammatory changes in intestinal and extra-intestinal compartments including the brain.
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Affiliation(s)
- Stefan Bereswill
- Department of Microbiology and Hygiene, Charité - University Medicine Berlin, Centrum 5, Campus Benjamin Franklin, Hindenburgdamm 27, D-12203 Berlin, Germany
| | - Anja A Kühl
- Department of Internal Medicine, Rheumatology and Clinical Immunology/Research Center ImmunoSciences (RCIS), Charité - University Medicine Berlin, Berlin, Germany
| | - Marie Alutis
- Department of Microbiology and Hygiene, Charité - University Medicine Berlin, Centrum 5, Campus Benjamin Franklin, Hindenburgdamm 27, D-12203 Berlin, Germany
| | - André Fischer
- Department of Microbiology and Hygiene, Charité - University Medicine Berlin, Centrum 5, Campus Benjamin Franklin, Hindenburgdamm 27, D-12203 Berlin, Germany
| | - Luisa Möhle
- Department of Microbiology and Hygiene, University of Magdeburg, Magdeburg, Germany
| | - Daniela Struck
- Department of Microbiology and Hygiene, Charité - University Medicine Berlin, Centrum 5, Campus Benjamin Franklin, Hindenburgdamm 27, D-12203 Berlin, Germany
| | - Oliver Liesenfeld
- Department of Microbiology and Hygiene, Charité - University Medicine Berlin, Centrum 5, Campus Benjamin Franklin, Hindenburgdamm 27, D-12203 Berlin, Germany
| | - Ulf B Göbel
- Department of Microbiology and Hygiene, Charité - University Medicine Berlin, Centrum 5, Campus Benjamin Franklin, Hindenburgdamm 27, D-12203 Berlin, Germany
| | - Ildikò R Dunay
- Department of Microbiology and Hygiene, University of Magdeburg, Magdeburg, Germany
| | - Markus M Heimesaat
- Department of Microbiology and Hygiene, Charité - University Medicine Berlin, Centrum 5, Campus Benjamin Franklin, Hindenburgdamm 27, D-12203 Berlin, Germany
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