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Wu Y, Adeniyi-Ipadeola G, Adkins-Threats M, Seasock M, Suarez-Reyes C, Fujiwara R, Bottazzi ME, Song L, Mills JC, Weatherhead JE. Host gastric corpus microenvironment facilitates Ascaris suum larval hatching and infection in a murine model. PLoS Negl Trop Dis 2024; 18:e0011930. [PMID: 38324590 PMCID: PMC10878500 DOI: 10.1371/journal.pntd.0011930] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2023] [Revised: 02/20/2024] [Accepted: 01/21/2024] [Indexed: 02/09/2024] Open
Abstract
Ascariasis (roundworm) is the most common parasitic helminth infection globally and can lead to significant morbidity in children including chronic lung disease. Children become infected with Ascaris spp. via oral ingestion of eggs. It has long been assumed that Ascaris egg hatching and larval translocation across the gastrointestinal mucosa to initiate infection occurs in the small intestine. Here, we show that A. suum larvae hatched in the host stomach in a murine model. Larvae utilize acidic mammalian chitinase (AMCase; acid chitinase; Chia) from chief cells and acid pumped by parietal cells to emerge from eggs on the surface of gastric epithelium. Furthermore, antagonizing AMCase and gastric acid in the stomach decreases parasitic burden in the liver and lungs and attenuates lung disease. Given Ascaris eggs are chitin-coated, the gastric corpus would logically be the most likely organ for egg hatching, though this is the first study directly evincing the essential role of the host gastric corpus microenvironment. These findings point towards potential novel mechanisms for therapeutic targets to prevent ascariasis and identify a new biomedical significance of AMCase in mammals.
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Affiliation(s)
- Yifan Wu
- Department of Pediatrics, Division of Pediatric Tropical Medicine, Baylor College of Medicine, Houston, Texas, United States of America
| | - Grace Adeniyi-Ipadeola
- Department of Molecular Virology and Microbiology, Baylor College of Medicine, Houston, Texas, United States of America
| | - Mahliyah Adkins-Threats
- Department of Medicine, Section of Gastroenterology, Baylor College of Medicine, Houston, Texas, United States of America
- Departments of Pathology & Immunology, Baylor College of Medicine, Houston, Texas, United States of America
- Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, Texas, United States of America
| | - Matthew Seasock
- Department of Medicine, Immunology, Pathology, Baylor College of Medicine, Houston, Texas, United States of America
| | - Charlie Suarez-Reyes
- Department of Pediatrics, Division of Pediatric Tropical Medicine, Baylor College of Medicine, Houston, Texas, United States of America
| | - Ricardo Fujiwara
- Departamento de Parasitologia, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Maria Elena Bottazzi
- Department of Pediatrics, Division of Pediatric Tropical Medicine, Baylor College of Medicine, Houston, Texas, United States of America
- Department of Molecular Virology and Microbiology, Baylor College of Medicine, Houston, Texas, United States of America
- National School of Tropical Medicine, Baylor College of Medicine, Houston, Texas, United States of America
| | - Lizhen Song
- Department of Medicine, Immunology, Pathology, Baylor College of Medicine, Houston, Texas, United States of America
| | - Jason C. Mills
- Department of Medicine, Section of Gastroenterology, Baylor College of Medicine, Houston, Texas, United States of America
- Departments of Pathology & Immunology, Baylor College of Medicine, Houston, Texas, United States of America
- Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, Texas, United States of America
| | - Jill E. Weatherhead
- Department of Pediatrics, Division of Pediatric Tropical Medicine, Baylor College of Medicine, Houston, Texas, United States of America
- National School of Tropical Medicine, Baylor College of Medicine, Houston, Texas, United States of America
- Department of Medicine, Section of Infectious Diseases, Baylor College of Medicine, Houston, Texas, United States of America
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Ghorbanian F, Seo H, Tajdozian H, Lee Y, Rahim MDA, Kim S, Jung IY, Lee S, Song HY. In Vivo Efficacy of Bacillus velezensis Isolated from Korean Gochang Bokbunja Vinegar against Carbapenem-Resistant Klebsiella pneumoniae Infections. Pol J Microbiol 2022; 71:553-562. [PMID: 36515501 PMCID: PMC9944968 DOI: 10.33073/pjm-2022-051] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2022] [Accepted: 11/03/2022] [Indexed: 12/15/2022] Open
Abstract
Outbreaks of carbapenem-resistant Enterobacteriaceae (CRE), especially Klebsiella pneumoniae (CRKP), are commonly reported as severe infections in hospitals and long-term care settings, and their occurrence is increasing globally. Conventional antibiotics used for treating CRE have become ineffective due to resistance development. Furthermore, their safety issues restrict their availability and use for CRE treatment. Therefore, developing new drugs different from existing drugs to combat this deadly menace is urgently needed. Probiotics can be a potential option in this context, as probiotics' efficacy against a variety of infectious illnesses has already been well established. Here, we report the effect of the Bacillus velezensis strain isolated from Gochang Bokbunja vinegar in Korea on CRE infection using two mouse models. Data showed that pretreatment with B. velezensis significantly reduced body weight loss and mortality of CRKP-infected mice in the preventive model. The oral administration of B. velezensis in a therapeutic model also decreased the mortality and illness severity in CRKP-infected mice. Moreover, a two-week oral acute toxicity assay in guinea pigs did not reveal any aberrant clinical signs. Our findings demonstrate the potential effectiveness of our candidate probiotic strain, B. velezensis, against CRKP, suggesting that it could be used as an antimicrobial agent for treating CRKP-related infections.
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Affiliation(s)
- Fatemeh Ghorbanian
- Department of Microbiology and Immunology, School of Medicine, Soonchunhyang University, Cheonan, Chungnam, Republic of Korea,Probiotics Microbiome Convergence Center, Soonchunhyang University, Asan, Chungnam, Republic of Korea
| | - Hoonhee Seo
- Department of Microbiology and Immunology, School of Medicine, Soonchunhyang University, Cheonan, Chungnam, Republic of Korea,Probiotics Microbiome Convergence Center, Soonchunhyang University, Asan, Chungnam, Republic of Korea
| | - Hanieh Tajdozian
- Department of Microbiology and Immunology, School of Medicine, Soonchunhyang University, Cheonan, Chungnam, Republic of Korea,Probiotics Microbiome Convergence Center, Soonchunhyang University, Asan, Chungnam, Republic of Korea
| | - Youngkyoung Lee
- Department of Microbiology and Immunology, School of Medicine, Soonchunhyang University, Cheonan, Chungnam, Republic of Korea,Probiotics Microbiome Convergence Center, Soonchunhyang University, Asan, Chungnam, Republic of Korea
| | - MD Abdur Rahim
- Department of Microbiology and Immunology, School of Medicine, Soonchunhyang University, Cheonan, Chungnam, Republic of Korea,Probiotics Microbiome Convergence Center, Soonchunhyang University, Asan, Chungnam, Republic of Korea
| | - Sukyung Kim
- Probiotics Microbiome Convergence Center, Soonchunhyang University, Asan, Chungnam, Republic of Korea
| | - Il-Yun Jung
- Korea Balsamic Vinegar Association, Gochang, Jeonbuk, Republic of Korea
| | - Saebim Lee
- Department of Microbiology and Immunology, School of Medicine, Soonchunhyang University, Cheonan, Chungnam, Republic of Korea,Probiotics Microbiome Convergence Center, Soonchunhyang University, Asan, Chungnam, Republic of Korea
| | - Ho-Yeon Song
- Department of Microbiology and Immunology, School of Medicine, Soonchunhyang University, Cheonan, Chungnam, Republic of Korea,Probiotics Microbiome Convergence Center, Soonchunhyang University, Asan, Chungnam, Republic of Korea, H.-Y. Song, Department of Microbiology and Immunology, School of Medicine, Soonchunhyang University, Cheonan, Chungnam, Republic of Korea; Probiotics Microbiome Convergence Center, Soonchunhyang University, Asan, Chungnam, Republic of Korea
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3
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The Phylogeny and Biological Function of Gastric Juice-Microbiological Consequences of Removing Gastric Acid. Int J Mol Sci 2019; 20:ijms20236031. [PMID: 31795477 PMCID: PMC6928904 DOI: 10.3390/ijms20236031] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2019] [Revised: 11/24/2019] [Accepted: 11/25/2019] [Indexed: 12/15/2022] Open
Abstract
Gastric juice is a unique combination of hydrochloric acid (HCl), lipase, and pepsin. Acidic gastric juice is found in all vertebrates, and its main function is to inactivate microorganisms. The phylogenetic preservation of this energy-consuming and, at times, hazardous function (acid-related diseases) reflects its biological importance. Proton pump inhibitors (PPIs) are one of the most widely used drugs in the world. Due to the reduced prevalence of Helicobacter pylori infection as well as the increased use of inhibitors of gastric acid secretion, the latter has become the most important cause of gastric hypoacidity. In the present manuscript, we review the microbiological consequences of removing gastric acidity. The resulting susceptibility to infections has not been studied extensively, and focus has mainly been restricted to bacterial and parasitic agents only. The strongest evidence concerning the relationship between hypochlorhydria and predisposition to infections relates to bacterial infections affecting the gastrointestinal tract. However, several other clinical settings with increased susceptibility to infections due to inhibited gastric acidity are discussed. We also discuss the impact of hypochlorhydria on the gut microbiome.
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D'Orazio SEF. Animal models for oral transmission of Listeria monocytogenes. Front Cell Infect Microbiol 2014; 4:15. [PMID: 24575393 PMCID: PMC3920067 DOI: 10.3389/fcimb.2014.00015] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2013] [Accepted: 01/27/2014] [Indexed: 11/13/2022] Open
Abstract
Listeria monocytogenes has been recognized as a food borne pathogen in humans since the 1980s, but we still understand very little about oral transmission of L. monocytogenes or the host factors that determine susceptibility to gastrointestinal infection, due to the lack of an appropriate small animal model of oral listeriosis. Early feeding trials suggested that many animals were highly resistant to oral infection, and the more reproducible intravenous or intraperitoneal routes of inoculation soon came to be favored. There are a fair number of previously published studies using an oral infection route, but the work varies widely in terms of bacterial strain choice, the methods used for oral transmission, and various manipulations used to enhance infectivity. This mini review summarizes the published literature using oral routes of L. monocytogenes infection and highlights recent technological advances that make oral infection a more attractive model system.
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Affiliation(s)
- Sarah E. F. D'Orazio
- Department of Microbiology, Immunology and Molecular Genetics, University of KentuckyLexington, KY, USA
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Roldgaard BB, Andersen JB, Hansen TB, Christensen BB, Licht TR. Comparison of three Listeria monocytogenes strains in a guinea-pig model simulating food-borne exposure. FEMS Microbiol Lett 2008; 291:88-94. [PMID: 19076231 DOI: 10.1111/j.1574-6968.2008.01439.x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
Three different Listeria monocytogenes strains, LO28 (a laboratory strain with truncated InlA), 4446 (a clinical isolate) and 7291 (a food isolate), were compared in a guinea-pig model designed to mimic food-borne exposure. The objectives were (1) to verify the applicability of the animal model for distinguishing between Listeria with different virulence properties and (2) to explore whether it was possible to reduce the required number of animals by dosing with mixed cultures instead of monocultures. Consistent with in vitro observations of infectivity in Caco-2 cells, faecal densities and presence in selected organs were considerably lower for LO28 than for the other two strains. Additionally, the animal study revealed a difference in prevalence in faeces as well as in internal organs between the clinical isolate and the food isolate, which was not reproduced in vitro. Dosage with monocultures of Listeria strains gave similar results as dosage with a mixture of the three strains; thus, the mixed infection approach was a feasible way to reduce the number of animals needed for determination of listerial virulence.
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Affiliation(s)
- Bent B Roldgaard
- National Food Institute, Technical University of Denmark, Soeborg, Denmark
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Shi LZ, Faith NG, Nakayama Y, Suresh M, Steinberg H, Czuprynski CJ. The aryl hydrocarbon receptor is required for optimal resistance to Listeria monocytogenes infection in mice. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2007; 179:6952-62. [PMID: 17982086 PMCID: PMC2701311 DOI: 10.4049/jimmunol.179.10.6952] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The aryl hydrocarbon receptor (AhR) is part of a powerful signaling system that is triggered by xenobiotic agents such as polychlorinated hydrocarbons and polycyclic aromatic hydrocarbons. Although activation of the AhR by 2,3,7,8-tetrachlorodibenzo-p-dioxin or certain polycyclic aromatic hydrocarbons can lead to immunosuppression, there is also increasing evidence that the AhR regulates certain normal developmental processes. In this study, we asked whether the AhR plays a role in host resistance using murine listeriosis as an experimental system. Our data clearly demonstrate that AhR null C57BL/6J mice (AhR(-/-)) are more susceptible to listeriosis than AhR heterozygous (AhR(+/-)) littermates when inoculated i.v. with log-phase Listeria monocytogenes. AhR(-/-) mice exhibited greater numbers of CFU of L. monocytogenes in the spleen and liver, and greater histopathological changes in the liver than AhR(+/-) mice. Serum levels of IL-6, MCP-1, IFN-gamma, and TNF-alpha were comparable between L. monocytogenes-infected AhR(-/-) and AhR(+/-) mice. Increased levels of IL-12 and IL-10 were observed in L. monocytogenes-infected AhR(-/-) mice. No significant difference was found between AhR(+/-) and AhR(-/-) macrophages ex vivo with regard to their ability to ingest and inhibit intracellular growth of L. monocytogenes. Intracellular cytokine staining of CD4(+) and CD8(+) splenocytes for IFN-gamma and TNF-alpha revealed comparable T cell-mediated responses in AhR(-/-) and AhR(+/-) mice. Previously infected AhR(-/-) and AhR(+/-) mice both exhibited enhanced resistance to reinfection with L. monocytogenes. These data provide the first evidence that AhR is required for optimal resistance but is not essential for adaptive immune response to L. monocytogenes infection.
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Affiliation(s)
- Lewis Zhichang Shi
- Department of Pathobiological Sciences, University of Wisconsin-Madison 2015 Linden Drive, Madison, WI 53705
| | - Nancy G. Faith
- Department of Pathobiological Sciences, University of Wisconsin-Madison 2015 Linden Drive, Madison, WI 53705
| | - Yumi Nakayama
- Department of Pathobiological Sciences, University of Wisconsin-Madison 2015 Linden Drive, Madison, WI 53705
| | - M. Suresh
- Department of Pathobiological Sciences, University of Wisconsin-Madison 2015 Linden Drive, Madison, WI 53705
| | - Howard Steinberg
- Department of Pathobiological Sciences, University of Wisconsin-Madison 2015 Linden Drive, Madison, WI 53705
| | - Charles J. Czuprynski
- Department of Pathobiological Sciences, University of Wisconsin-Madison 2015 Linden Drive, Madison, WI 53705
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Cotter PD, Hill C. Surviving the acid test: responses of gram-positive bacteria to low pH. Microbiol Mol Biol Rev 2003; 67:429-53, table of contents. [PMID: 12966143 PMCID: PMC193868 DOI: 10.1128/mmbr.67.3.429-453.2003] [Citation(s) in RCA: 764] [Impact Index Per Article: 36.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Gram-positive bacteria possess a myriad of acid resistance systems that can help them to overcome the challenge posed by different acidic environments. In this review the most common mechanisms are described: i.e., the use of proton pumps, the protection or repair of macromolecules, cell membrane changes, production of alkali, induction of pathways by transcriptional regulators, alteration of metabolism, and the role of cell density and cell signaling. We also discuss the responses of Listeria monocytogenes, Rhodococcus, Mycobacterium, Clostridium perfringens, Staphylococcus aureus, Bacillus cereus, oral streptococci, and lactic acid bacteria to acidic environments and outline ways in which this knowledge has been or may be used to either aid or prevent bacterial survival in low-pH environments.
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Affiliation(s)
- Paul D Cotter
- Department of Microbiology and National Food Biotechnology Centre, University College Cork, Cork, Ireland
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Czuprynski CJ, Faith NG, Steinberg H. Ability of the Listeria monocytogenes strain Scott A to cause systemic infection in mice infected by the intragastric route. Appl Environ Microbiol 2002; 68:2893-900. [PMID: 12039747 PMCID: PMC123921 DOI: 10.1128/aem.68.6.2893-2900.2002] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2001] [Accepted: 03/21/2002] [Indexed: 11/20/2022] Open
Abstract
Listeriosis is an important food-borne disease that causes high rates of morbidity and mortality. For reasons that are not clear, most large outbreaks of human listeriosis involve Listeria monocytogenes serotype 4b. Relatively little is known about the pathogenesis of listeriosis following gastrointestinal exposure to food-borne disease isolates of L. monocytogenes. In the present study, we investigated the pathogenesis of systemic infection by the food-borne isolate Scott A in an intragastric (i.g.) mouse challenge model. We found that the severity of infection with L. monocytogenes Scott A was increased in mice made neutropenic by administration of monoclonal antibody RB6-8C5. This observation was similar to a previous report on a study with the laboratory strain L. monocytogenes EGD. Prior administration of sodium bicarbonate did not enhance the virulence of L. monocytogenes strain Scott A for i.g. inoculated mice. Following i.g. inoculation of mice, two serotype 4b strains of L. monocytogenes (Scott A and 101M) achieved a greater bacterial burden in the spleen and liver and elicited more severe histopathological damage to those organs than did a serotype 1/2a strain (EGD) and a serotype 1/2b stain (CM). Of the four strains tested, only strain CM exhibited poor survival in synthetic gastric fluid in vitro. The other three strains exhibited similar patterns of survival at pHs of greater than 5 and relatively rapid (<30 min) loss of viability at pHs of less than 5.0. Growth of L. monocytogenes Scott A at temperatures of 12.5 to 37 degrees C did not affect its ability to cause systemic infection in i.g. inoculated mice. These observations suggest that the serotype 4b L. monocytogenes strains Scott A and 101M possess one or more virulence determinants that make them better able to cause systemic infection following inoculation via the g.i. tract than do the serotype 1/2 strains EGD and CM.
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Affiliation(s)
- Charles J Czuprynski
- Department of Pathobiological Sciences School of Veterinary Medicine, University of Wisconsin, Madison, Wisconsin 53706, USA.
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