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Pauzé-Foixet J, Mathieu-Denoncourt A, Duperthuy M. Elevated concentrations of polymyxin B elicit a biofilm-specific resistance mechanism in Vibrio cholerae. Res Microbiol 2024; 175:104179. [PMID: 38185395 DOI: 10.1016/j.resmic.2023.104179] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2023] [Revised: 12/05/2023] [Accepted: 12/30/2023] [Indexed: 01/09/2024]
Abstract
Vibrio cholerae can form biofilms in the aquatic environment and in the human intestine, facilitating the release of hyper-infectious aggregates. Due to the increasing antibiotic resistance, alternatives need to be found. One of these alternatives is antimicrobial peptides, including polymyxin B (PmB). In this study, we first investigated the resistance of V. cholerae O1 El Tor strain A1552 to various antimicrobials under aerobic and anaerobic conditions. An increased resistance to PmB is observed in anaerobiosis, with a 3-fold increase in the dose required for 50 % growth inhibition. We then studied the impact of the PmB on the formation and the degradation of V. cholerae biofilms to PmB. Our results show that PmB affects more efficiently biofilm formation under anaerobic conditions. On the other hand, preformed biofilms are susceptible to degradation by PmB at concentrations close to the minimal inhibitory concentration. At higher concentrations, we observe an opacification of the biofilm structures within 20 min post-treatment, suggesting a densification of the structure. This densification does not seem to result from the overexpression of matrix genes but rather from DNA release through massive cell lysis, likely forming a protective shield that limits the penetration of the PmB into the biofilm.
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Affiliation(s)
- Julien Pauzé-Foixet
- Département de Microbiologie, Infectiologie et Immunologie, Faculté de médecine, Université de Montréal, Montréal, Québec, Canada
| | - Annabelle Mathieu-Denoncourt
- Département de Microbiologie, Infectiologie et Immunologie, Faculté de médecine, Université de Montréal, Montréal, Québec, Canada
| | - Marylise Duperthuy
- Département de Microbiologie, Infectiologie et Immunologie, Faculté de médecine, Université de Montréal, Montréal, Québec, Canada.
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Smith CB, Gao A, Bravo P, Alam A. Microbial Metabolite Trimethylamine N-Oxide Promotes Campylobacter jejuni Infection by Escalating Intestinal Inflammation, Epithelial Damage, and Barrier Disruption. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.04.10.588895. [PMID: 38645062 PMCID: PMC11030326 DOI: 10.1101/2024.04.10.588895] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/23/2024]
Abstract
The interactions between Campylobacter jejuni , a critical foodborne cause of gastroenteritis, and the intestinal microbiota during infection are not completely understood. The crosstalk between C. jejuni and its host is impacted by the gut microbiota through mechanisms of competitive exclusion, microbial metabolites, or immune response. To investigate the role of gut microbiota on C. jejuni pathogenesis, we examined campylobacteriosis in the IL10KO mouse model, which was characterized by an increase in the relative abundance of intestinal proteobacteria, E. coli , and inflammatory cytokines during C. jejuni infection. We also found a significantly increased abundance of microbial metabolite Trimethylamine N-Oxide (TMAO) in the colonic lumens of IL10KO mice. We further investigated the effects of TMAO on C. jejuni pathogenesis. We determined that C. jejuni senses TMAO as a chemoattractant and the administration of TMAO promotes C. jejuni invasion into Caco-2 monolayers. TMAO also increased the transmigration of C. jejuni across polarized monolayers of Caco-2 cells, decreased TEER, and increased C. jejuni -mediated intestinal barrier damage. Interestingly, TMAO treatment and presence during C. jejuni infection of Caco-2 cells synergistically caused an increased inflammatory cytokine expression, specifically IL-1β and IL-8. These results establish that C. jejuni utilizes microbial metabolite TMAO for increased virulence during infection.
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Van Alst AJ, Demey LM, DiRita VJ. Vibrio cholerae requires oxidative respiration through the bd-I and cbb3 oxidases for intestinal proliferation. PLoS Pathog 2022; 18:e1010102. [PMID: 35500027 PMCID: PMC9109917 DOI: 10.1371/journal.ppat.1010102] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2021] [Revised: 05/16/2022] [Accepted: 04/05/2022] [Indexed: 01/05/2023] Open
Abstract
Vibrio cholerae respires both aerobically and anaerobically and, while oxygen may be available to it during infection, other terminal electron acceptors are proposed for population expansion during infection. Unlike gastrointestinal pathogens that stimulate significant inflammation leading to elevated levels of oxygen or alternative terminal electron acceptors, V. cholerae infections are not understood to induce a notable inflammatory response. To ascertain the respiration requirements of V. cholerae during infection, we used Multiplex Genome Editing by Natural Transformation (MuGENT) to create V. cholerae strains lacking aerobic or anaerobic respiration. V. cholerae strains lacking aerobic respiration were attenuated in infant mice 105-fold relative to wild type, while strains lacking anaerobic respiration had no colonization defect, contrary to earlier work suggesting a role for anaerobic respiration during infection. Using several approaches, including one we developed for this work termed Comparative Multiplex PCR Amplicon Sequencing (CoMPAS), we determined that the bd-I and cbb3 oxidases are essential for small intestinal colonization of V. cholerae in the infant mouse. The bd-I oxidase was also determined as the primary oxidase during growth outside the host, making V. cholerae the only example of a Gram-negative bacterial pathogen in which a bd-type oxidase is the primary oxidase for energy acquisition inside and outside of a host. The bacterium that causes cholera, Vibrio cholerae, can grow with or without oxygen. When growing without oxygen it may use other molecules that serve the same purpose as oxygen, acting as a terminal electron acceptor in an energy-generating process known as respiration. Given the largely anaerobic nature of the gastrointestinal tract, and the lack of significant inflammation during cholera infection, a process that can stimulate elevated levels of oxygen and other terminal electron acceptors, we sought to understand the respiratory mechanisms of V. cholerae during infection. We used a powerful genome-editing method to construct mutant strains of V. cholerae lacking some or all of the complement of proteins required for aerobic or anaerobic respiration. By analyzing these mutants in the laboratory and in intestinal colonization of infant mice, we determined that the ability to respire without oxygen is completely dispensable for V. cholerae to thrive during infection. We determined that two of the four oxygen-dependent respiration mechanisms are essential for V. cholerae to grow during infection, with the other two dispensable for wild type levels of colonization.
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Affiliation(s)
- Andrew J. Van Alst
- Department of Microbiology and Molecular Genetics, Michigan State University, East Lansing, Michigan, United States of America
| | - Lucas M. Demey
- Department of Microbiology and Molecular Genetics, Michigan State University, East Lansing, Michigan, United States of America
| | - Victor J. DiRita
- Department of Microbiology and Molecular Genetics, Michigan State University, East Lansing, Michigan, United States of America
- * E-mail:
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Zheng L, Zhu LW, Jing J, Guan JY, Lu GJ, Xie LH, Ji X, Chu D, Sun Y, Chen P, Guo XJ. Pan-Genome Analysis of Vibrio cholerae and Vibrio metschnikovii Strains Isolated From Migratory Birds at Dali Nouer Lake in Chifeng, China. Front Vet Sci 2021; 8:638820. [PMID: 34136552 PMCID: PMC8202012 DOI: 10.3389/fvets.2021.638820] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2020] [Accepted: 05/04/2021] [Indexed: 11/13/2022] Open
Abstract
Migratory birds are recently recognized as Vibrio disease vectors, but may be widespread transporters of Vibrio strains. We isolated Vibrio cholerae (V. cholerae) and Vibrio metschnikovii (V. metschnikovii) strains from migratory bird epidemic samples from 2017 to 2018 and isolated V. metschnikovii from migratory bird feces in 2019 from bird samples taken from the Inner Mongolia autonomous region of China. To investigate the evolution of these two Vibrio species, we sequenced the genomes of 40 V. cholerae strains and 34 V. metschnikovii strains isolated from the bird samples and compared these genomes with reference strain genomes. The pan-genome of all V. cholerae and V. metschnikovii genomes was large, with strains exhibiting considerable individual differences. A total of 2,130 and 1,352 core genes were identified in the V. cholerae and V. metschnikovii genomes, respectively, while dispensable genes accounted for 16,180 and 9,178 of all genes for the two strains, respectively. All V. cholerae strains isolated from the migratory birds that encoded T6SS and hlyA were non-O1/O139 serotypes without the ability to produce CTX. These strains also lacked the ability to produce the TCP fimbriae nor the extracellular matrix protein RbmA and could not metabolize trimetlylamine oxide (TMAO). Thus, these characteristics render them unlikely to be pandemic-inducing strains. However, a V. metschnikovii isolate encoding the complete T6SS system was isolated for the first time. These data provide new molecular insights into the diversity of V. cholerae and V. metschnikovii isolates recovered from migratory birds.
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Affiliation(s)
- Lin Zheng
- School of Food and Engineering, Jilin Agricultural University, Changchun, China.,The Key Laboratory of Jilin Province for Zoonosis Prevention and Control, Changchun, China
| | - Ling-Wei Zhu
- The Key Laboratory of Jilin Province for Zoonosis Prevention and Control, Changchun, China
| | - Jie Jing
- The Key Laboratory of Jilin Province for Zoonosis Prevention and Control, Changchun, China
| | - Jia-Yao Guan
- The Key Laboratory of Jilin Province for Zoonosis Prevention and Control, Changchun, China
| | - Ge-Jin Lu
- The Key Laboratory of Jilin Province for Zoonosis Prevention and Control, Changchun, China
| | - Lin-Hong Xie
- Wild Animal Sources and Diseases Inspection Station, National Forestry and Grassl and Bureau, Beijing, China
| | - Xue Ji
- The Key Laboratory of Jilin Province for Zoonosis Prevention and Control, Changchun, China
| | - Dong Chu
- Wild Animal Sources and Diseases Inspection Station, National Forestry and Grassl and Bureau, Beijing, China
| | - Yang Sun
- The Key Laboratory of Jilin Province for Zoonosis Prevention and Control, Changchun, China
| | - Ping Chen
- School of Food and Engineering, Jilin Agricultural University, Changchun, China
| | - Xue-Jun Guo
- The Key Laboratory of Jilin Province for Zoonosis Prevention and Control, Changchun, China
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Kundra S, Colomer-Winter C, Lemos JA. Survival of the Fittest: The Relationship of (p)ppGpp With Bacterial Virulence. Front Microbiol 2020; 11:601417. [PMID: 33343543 PMCID: PMC7744563 DOI: 10.3389/fmicb.2020.601417] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Accepted: 11/16/2020] [Indexed: 12/11/2022] Open
Abstract
The signaling nucleotide (p)ppGpp has been the subject of intense research in the past two decades. Initially discovered as the effector molecule of the stringent response, a bacterial stress response that reprograms cell physiology during amino acid starvation, follow-up studies indicated that many effects of (p)ppGpp on cell physiology occur at levels that are lower than those needed to fully activate the stringent response, and that the repertoire of enzymes involved in (p)ppGpp metabolism is more diverse than initially thought. Of particular interest, (p)ppGpp regulation has been consistently linked to bacterial persistence and virulence, such that the scientific pursuit to discover molecules that interfere with (p)ppGpp signaling as a way to develop new antimicrobials has grown substantially in recent years. Here, we highlight contemporary studies that have further supported the intimate relationship of (p)ppGpp with bacterial virulence and studies that provided new insights into the different mechanisms by which (p)ppGpp modulates bacterial virulence.
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Affiliation(s)
- Shivani Kundra
- Department of Oral Biology, UF College of Dentistry, Gainesville, FL, United States
| | | | - José A Lemos
- Department of Oral Biology, UF College of Dentistry, Gainesville, FL, United States
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Bueno E, Pinedo V, Cava F. Adaptation of Vibrio cholerae to Hypoxic Environments. Front Microbiol 2020; 11:739. [PMID: 32425907 PMCID: PMC7212424 DOI: 10.3389/fmicb.2020.00739] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2020] [Accepted: 03/30/2020] [Indexed: 01/02/2023] Open
Abstract
Bacteria can colonize virtually any environment on Earth due to their remarkable capacity to detect and respond quickly and adequately to environmental stressors. Vibrio cholerae is a cosmopolitan bacterium that inhabits a vast range of environments. The V. cholerae life cycle comprises diverse environmental and infective stages. The bacterium is found in aquatic ecosystems both under free-living conditions or associated with a wide range of aquatic organisms, and some strains are also capable of causing epidemics in humans. In order to adapt between environments, V. cholerae possesses a versatile metabolism characterized by the rapid cross-regulation of energy-producing pathways. Low oxygen concentration is a key environmental factor that governs V. cholerae physiology. This article reviews the metabolic plasticity that enables V. cholerae to thrive on low oxygen concentrations and its role in environmental and host adaptation.
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Affiliation(s)
- Emilio Bueno
- Laboratory for Molecular Infection Medicine Sweden, Department of Molecular Biology, Umeå Centre for Microbial Research, Umeå University, Umeå, Sweden
| | | | - Felipe Cava
- Laboratory for Molecular Infection Medicine Sweden, Department of Molecular Biology, Umeå Centre for Microbial Research, Umeå University, Umeå, Sweden
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7
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Stringent response interacts with the ToxR regulon to regulate Vibrio cholerae virulence factor expression. Arch Microbiol 2020; 202:1359-1368. [DOI: 10.1007/s00203-020-01847-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2019] [Revised: 02/03/2020] [Accepted: 02/25/2020] [Indexed: 10/24/2022]
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You JS, Yong JH, Kim GH, Moon S, Nam KT, Ryu JH, Yoon MY, Yoon SS. Commensal-derived metabolites govern Vibrio cholerae pathogenesis in host intestine. MICROBIOME 2019; 7:132. [PMID: 31521198 PMCID: PMC6744661 DOI: 10.1186/s40168-019-0746-y] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2019] [Accepted: 09/03/2019] [Indexed: 05/15/2023]
Abstract
BACKGROUND Recent evidence suggests that the commensal microbes act as a barrier against invading pathogens and enteric infections are the consequences of multi-layered interactions among commensals, pathogens, and the host intestinal tissue. However, it remains unclear how perturbations of the gut microbiota compromise host infection resistance, especially through changes at species and metabolite levels. RESULTS Here, we illustrate how Bacteroides vulgatus, a dominant species of the Bacteroidetes phylum in mouse intestine, suppresses infection by Vibrio cholerae, an important human pathogen. Clindamycin (CL) is an antibiotic that selectively kills anaerobic bacteria, and accordingly Bacteroidetes are completely eradicated from CL-treated mouse intestines. The Bacteroidetes-depleted adult mice developed severe cholera-like symptoms, when infected with V. cholerae. Germ-free mice mono-associated with B. vulgatus became resistant to V. cholerae infection. Levels of V. cholerae growth-inhibitory metabolites including short-chain fatty acids plummeted upon CL treatment, while levels of compounds that enhance V. cholerae proliferation were elevated. Furthermore, the intestinal colonization process of V. cholerae was well-simulated in CL-treated adult mice. CONCLUSIONS Overall, we provide insights into how a symbiotic microbe and a pathogenic intruder interact inside host intestine. We identified B. vulgatus as an indigenous microbial species that can suppress intestinal infection. Our results also demonstrate that commensal-derived metabolites are a critical determinant for host resistance against V. cholerae infection, and that CL pretreatment of adult mice generates a simple yet useful model of cholera infection.
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Affiliation(s)
- Jin Sun You
- Department of Microbiology and Immunology, Yonsei University College of Medicine, 50-1 Yonsei-ro, Seodaemun-gu Seoul, Seoul, 03722, Korea
- Brain Korea 21 PLUS Project for Medical Sciences, Yonsei University College of Medicine, Seoul, 03722, Korea
| | - Ji Hyun Yong
- Department of Microbiology and Immunology, Yonsei University College of Medicine, 50-1 Yonsei-ro, Seodaemun-gu Seoul, Seoul, 03722, Korea
- Brain Korea 21 PLUS Project for Medical Sciences, Yonsei University College of Medicine, Seoul, 03722, Korea
| | - Gwang Hee Kim
- Department of Microbiology and Immunology, Yonsei University College of Medicine, 50-1 Yonsei-ro, Seodaemun-gu Seoul, Seoul, 03722, Korea
- Brain Korea 21 PLUS Project for Medical Sciences, Yonsei University College of Medicine, Seoul, 03722, Korea
| | - Sungmin Moon
- Brain Korea 21 PLUS Project for Medical Sciences, Yonsei University College of Medicine, Seoul, 03722, Korea
- Severance Biomedical Science Institute, Yonsei University College of Medicine, Seoul, 03722, Korea
| | - Ki Taek Nam
- Brain Korea 21 PLUS Project for Medical Sciences, Yonsei University College of Medicine, Seoul, 03722, Korea
- Severance Biomedical Science Institute, Yonsei University College of Medicine, Seoul, 03722, Korea
| | - Ji Hwan Ryu
- Brain Korea 21 PLUS Project for Medical Sciences, Yonsei University College of Medicine, Seoul, 03722, Korea
- Severance Biomedical Science Institute, Yonsei University College of Medicine, Seoul, 03722, Korea
| | - Mi Young Yoon
- Department of Microbiology and Immunology, Yonsei University College of Medicine, 50-1 Yonsei-ro, Seodaemun-gu Seoul, Seoul, 03722, Korea.
- Brain Korea 21 PLUS Project for Medical Sciences, Yonsei University College of Medicine, Seoul, 03722, Korea.
- Institute for Immunology and Immunological Diseases, Yonsei University College of Medicine, Seoul, 03722, Korea.
| | - Sang Sun Yoon
- Department of Microbiology and Immunology, Yonsei University College of Medicine, 50-1 Yonsei-ro, Seodaemun-gu Seoul, Seoul, 03722, Korea.
- Brain Korea 21 PLUS Project for Medical Sciences, Yonsei University College of Medicine, Seoul, 03722, Korea.
- Institute for Immunology and Immunological Diseases, Yonsei University College of Medicine, Seoul, 03722, Korea.
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Basu P, Bhadra RK. Post-transcriptional regulation of cholera toxin production in Vibrio cholerae by the stringent response regulator DksA. MICROBIOLOGY-SGM 2018; 165:102-112. [PMID: 30444469 DOI: 10.1099/mic.0.000743] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Expression of cholera toxin (CT), the principal virulence factor of the cholera pathogen Vibrio cholerae, is positively modulated by the RNA polymerase binding unusual transcription factor DksA (DksAVc) of the stringent response pathway. Here we report that even though CT (encoded by the genes ctxAB) production is downregulated in the V. cholerae ΔdksA (ΔdksAVc) mutant, the expression of the ctxA gene as well as the genes encoding different virulence regulators, namely, AphA, TcpP and ToxT, were also upregulated. Since DksAVc positively regulates HapR, a known negative regulator of CT production, the increased expression of different virulence genes in ΔdksAVc was due most probably to downregulation of HapR. There was no secretion/transport-related defect in ΔdksAVc cells because whole cell lysates of the mutant showed a negligible amount of CT accumulation similar to WT cells. To understand further, the hapR gene was deleted in ΔdksAVc background, however, the double mutant failed to rescue the CT production defect suggesting strongly towards post-transcriptional/translational regulation by DksAVc. This hypothesis was further confirmed when the site-directed mutagenesis of each or both of the conserved aspartic acid residues at positions 68 and 71 of DksAVc, which are essential for transcription initiation during the stringent response, had no effect in the regulation of CT expression. Interestingly, progressive deletion analysis indicated that the C4-type Zn finger motif present in the C-terminus of DksAVc is essential for optimal CT production. Since this motif plays important roles in DNA/RNA binding, the present study indicates a novel complex post-transcriptional regulation of CT expression by DksAVc.
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Affiliation(s)
- Pallabi Basu
- Infectious Diseases and Immunology Division, CSIR-Indian Institute of Chemical Biology, Kolkata-700 032, India
| | - Rupak K Bhadra
- Infectious Diseases and Immunology Division, CSIR-Indian Institute of Chemical Biology, Kolkata-700 032, India
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Dorman MJ, Dorman CJ. Regulatory Hierarchies Controlling Virulence Gene Expression in Shigella flexneri and Vibrio cholerae. Front Microbiol 2018; 9:2686. [PMID: 30473684 PMCID: PMC6237886 DOI: 10.3389/fmicb.2018.02686] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2018] [Accepted: 10/22/2018] [Indexed: 12/13/2022] Open
Abstract
Gram-negative enteropathogenic bacteria use a variety of strategies to cause disease in the human host and gene regulation in some form is typically a part of the strategy. This article will compare the toxin-based infection strategy used by the non-invasive pathogen Vibrio cholerae, the etiological agent in human cholera, with the invasive approach used by Shigella flexneri, the cause of bacillary dysentery. Despite the differences in the mechanisms by which the two pathogens cause disease, they use environmentally-responsive regulatory hierarchies to control the expression of genes that have some features, and even some components, in common. The involvement of AraC-like transcription factors, the integration host factor, the Factor for inversion stimulation, small regulatory RNAs, the RNA chaperone Hfq, horizontal gene transfer, variable DNA topology and the need to overcome the pervasive silencing of transcription by H-NS of horizontally acquired genes are all shared features. A comparison of the regulatory hierarchies in these two pathogens illustrates some striking cross-species similarities and differences among mechanisms coordinating virulence gene expression. S. flexneri, with its low infectious dose, appears to use a strategy that is centered on the individual bacterial cell, whereas V. cholerae, with a community-based, quorum-dependent approach and an infectious dose that is several orders of magnitude higher, seems to rely more on the actions of a bacterial collective.
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Affiliation(s)
- Matthew J Dorman
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, United Kingdom
| | - Charles J Dorman
- Department of Microbiology, Moyne Institute of Preventive Medicine, Trinity College Dublin, Dublin, Ireland
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Mechanisms of Bacterial Tolerance and Persistence in the Gastrointestinal and Respiratory Environments. Clin Microbiol Rev 2018; 31:31/4/e00023-18. [PMID: 30068737 DOI: 10.1128/cmr.00023-18] [Citation(s) in RCA: 91] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
Pathogens that infect the gastrointestinal and respiratory tracts are subjected to intense pressure due to the environmental conditions of the surroundings. This pressure has led to the development of mechanisms of bacterial tolerance or persistence which enable microorganisms to survive in these locations. In this review, we analyze the general stress response (RpoS mediated), reactive oxygen species (ROS) tolerance, energy metabolism, drug efflux pumps, SOS response, quorum sensing (QS) bacterial communication, (p)ppGpp signaling, and toxin-antitoxin (TA) systems of pathogens, such as Escherichia coli, Salmonella spp., Vibrio spp., Helicobacter spp., Campylobacter jejuni, Enterococcus spp., Shigella spp., Yersinia spp., and Clostridium difficile, all of which inhabit the gastrointestinal tract. The following respiratory tract pathogens are also considered: Staphylococcus aureus, Pseudomonas aeruginosa, Acinetobacter baumannii, Burkholderia cenocepacia, and Mycobacterium tuberculosis Knowledge of the molecular mechanisms regulating the bacterial tolerance and persistence phenotypes is essential in the fight against multiresistant pathogens, as it will enable the identification of new targets for developing innovative anti-infective treatments.
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Kim HY, Go J, Lee KM, Oh YT, Yoon SS. Guanosine tetra- and pentaphosphate increase antibiotic tolerance by reducing reactive oxygen species production in Vibrio cholerae. J Biol Chem 2018; 293:5679-5694. [PMID: 29475943 PMCID: PMC5900777 DOI: 10.1074/jbc.ra117.000383] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2017] [Revised: 02/16/2018] [Indexed: 02/06/2023] Open
Abstract
The pathogen Vibrio cholerae is the causative agent of cholera. Emergence of antibiotic-resistant V. cholerae strains is increasing, but the underlying mechanisms remain unclear. Herein, we report that the stringent response regulator and stress alarmone guanosine tetra- and pentaphosphate ((p)ppGpp) significantly contributes to antibiotic tolerance in V. cholerae We found that N16961, a pandemic V. cholerae strain, and its isogenic (p)ppGpp-overexpressing mutant ΔrelAΔspoT are both more antibiotic-resistant than (p)ppGpp0 (ΔrelAΔrelVΔspoT) and ΔdksA mutants, which cannot produce or utilize (p)ppGpp, respectively. We also found that additional disruption of the aconitase B-encoding and tricarboxylic acid (TCA) cycle gene acnB in the (p)ppGpp0 mutant increases its antibiotic tolerance. Moreover, expression of TCA cycle genes, including acnB, was increased in (p)ppGpp0, but not in the antibiotic-resistant ΔrelAΔspoT mutant, suggesting that (p)ppGpp suppresses TCA cycle activity, thereby entailing antibiotic resistance. Importantly, when grown anaerobically or incubated with an iron chelator, the (p)ppGpp0 mutant became antibiotic-tolerant, suggesting that reactive oxygen species (ROS) are involved in antibiotic-mediated bacterial killing. Consistent with that hypothesis, tetracycline treatment markedly increased ROS production in the antibiotic-susceptible mutants. Interestingly, expression of the Fe(III) ABC transporter substrate-binding protein FbpA was increased 10-fold in (p)ppGpp0, and fbpA gene deletion restored viability of tetracycline-exposed (p)ppGpp0 cells. Of note, FbpA expression was repressed in the (p)ppGpp-accumulating mutant, resulting in a reduction of intracellular free iron, required for the ROS-generating Fenton reaction. Our results indicate that (p)ppGpp-mediated suppression of central metabolism and iron uptake reduces antibiotic-induced oxidative stress in V. cholerae.
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Affiliation(s)
- Hwa Young Kim
- From the Department of Microbiology and Immunology, Brain Korea 21 PLUS Project for Medical Science, and ,the Institute for Immunology and Immunological Diseases, Yonsei University College of Medicine, Seoul 03722, Korea and
| | - Junhyeok Go
- From the Department of Microbiology and Immunology, Brain Korea 21 PLUS Project for Medical Science, and ,the Institute for Immunology and Immunological Diseases, Yonsei University College of Medicine, Seoul 03722, Korea and
| | - Kang-Mu Lee
- From the Department of Microbiology and Immunology, Brain Korea 21 PLUS Project for Medical Science, and ,the Institute for Immunology and Immunological Diseases, Yonsei University College of Medicine, Seoul 03722, Korea and
| | - Young Taek Oh
- From the Department of Microbiology and Immunology, Brain Korea 21 PLUS Project for Medical Science, and ,the Freshwater Bioresources Utilization Division, Nakdonggang National Institute of Biological Resources, SangJu 37242, Korea, To whom correspondence may be addressed:
Freshwater Bioresources Utilization Division, Nakdonggang National Institute of Biological Resources, SangJu-si 37242, Korea. Tel.:
82-54-530-0932; Fax:
82-54-530-0949; E-mail:
| | - Sang Sun Yoon
- From the Department of Microbiology and Immunology, Brain Korea 21 PLUS Project for Medical Science, and ,the Institute for Immunology and Immunological Diseases, Yonsei University College of Medicine, Seoul 03722, Korea and , To whom correspondence may be addressed:
Dept. of Microbiology and Immunology, Yonsei University College of Medicine, 250 Seongsanno, Seodaemun-gu Seoul 120-752, Korea. Tel.:
82-2-2228-1824; Fax:
82-2-392-7088; E-mail:
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Abstract
Infectious diseases kill nearly 9 million people annually. Bacterial pathogens are responsible for a large proportion of these diseases, and the bacterial agents of pneumonia, diarrhea, and tuberculosis are leading causes of death and disability worldwide. Increasingly, the crucial role of nonhost environments in the life cycle of bacterial pathogens is being recognized. Heightened scrutiny has been given to the biological processes impacting pathogen dissemination and survival in the natural environment, because these processes are essential for the transmission of pathogenic bacteria to new hosts. This chapter focuses on the model environmental pathogen Vibrio cholerae to describe recent advances in our understanding of how pathogens survive between hosts and to highlight the processes necessary to support the cycle of environmental survival, transmission, and dissemination. We describe the physiological and molecular responses of V. cholerae to changing environmental conditions, focusing on its survival in aquatic reservoirs between hosts and its entry into and exit from human hosts.
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Oh YT, Kim HY, Kim EJ, Go J, Hwang W, Kim HR, Kim DW, Yoon SS. Selective and Efficient Elimination of Vibrio cholerae with a Chemical Modulator that Targets Glucose Metabolism. Front Cell Infect Microbiol 2016; 6:156. [PMID: 27900286 PMCID: PMC5111416 DOI: 10.3389/fcimb.2016.00156] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2016] [Accepted: 11/02/2016] [Indexed: 12/16/2022] Open
Abstract
Vibrio cholerae, a Gram-negative bacterium, is the causative agent of pandemic cholera. Previous studies have shown that the survival of the seventh pandemic El Tor biotype V. cholerae strain N16961 requires production of acetoin in a glucose-rich environment. The production of acetoin, a neutral fermentation end-product, allows V. cholerae to metabolize glucose without a pH drop, which is mediated by the production of organic acid. This finding suggests that inhibition of acetoin fermentation can result in V. cholerae elimination by causing a pH imbalance under glucose-rich conditions. Here, we developed a simple high-throughput screening method and identified an inducer of medium acidification (iMAC). Of 8364 compounds screened, we identified one chemical, 5-(4-chloro-2-nitrobenzoyl)-6-hydroxy-1,3-dimethylpyrimidine-2,4(1H,3H)-dione, that successfully killed glucose-metabolizing N16961 by inducing acidic stress. When N16961 was grown with abundant glucose in the presence of iMAC, acetoin production was completely suppressed and concomitant accumulation of lactate and acetate was observed. Using a beta-galactosidase activity assay with a single-copy palsD::lacZ reporter fusion, we show that that iMAC likely inhibits acetoin production at the transcriptional level. Thin-layer chromatography revealed that iMAC causes a significantly reduced accumulation of intracellular (p)ppGpp, a bacterial stringent response alarmone known to positively regulate acetoin production. In vivo bacterial colonization and fluid accumulation were also markedly decreased after iMAC treatment. Finally, we demonstrate iMAC-induced bacterial killing for 22 different V. cholerae strains belonging to diverse serotypes. Together, our results suggest that iMAC, acting as a metabolic modulator, has strong potential as a novel antibacterial agent for treatment against cholera.
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Affiliation(s)
- Young Taek Oh
- Department of Microbiology and Immunology, Yonsei University College of Medicine Seoul, South Korea
| | - Hwa Young Kim
- Department of Microbiology and Immunology, Yonsei University College of MedicineSeoul, South Korea; Brain Korea 21 Project for Medical Science, Yonsei University College of MedicineSeoul, South Korea
| | - Eun Jin Kim
- Department of Pharmacy, College of Pharmacy, Hanyang University Ansan, South Korea
| | - Junhyeok Go
- Department of Microbiology and Immunology, Yonsei University College of MedicineSeoul, South Korea; Brain Korea 21 Project for Medical Science, Yonsei University College of MedicineSeoul, South Korea
| | - Wontae Hwang
- Department of Microbiology and Immunology, Yonsei University College of MedicineSeoul, South Korea; Brain Korea 21 Project for Medical Science, Yonsei University College of MedicineSeoul, South Korea
| | - Hyoung Rae Kim
- Bio and Drug Discovery Division, Korea Research Institute of Chemical Technology Daejeon, South Korea
| | - Dong Wook Kim
- Department of Pharmacy, College of Pharmacy, Hanyang UniversityAnsan, South Korea; Institute of Pharmacological Research, Hanyang UniversityAnsan, South Korea
| | - Sang Sun Yoon
- Department of Microbiology and Immunology, Yonsei University College of MedicineSeoul, South Korea; Brain Korea 21 Project for Medical Science, Yonsei University College of MedicineSeoul, South Korea; Institute for Immunology and Immunological Diseases, Yonsei University College of MedicineSeoul, South Korea
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Wallace N, Zani A, Abrams E, Sun Y. The Impact of Oxygen on Bacterial Enteric Pathogens. ADVANCES IN APPLIED MICROBIOLOGY 2016; 95:179-204. [PMID: 27261784 DOI: 10.1016/bs.aambs.2016.04.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Bacterial enteric pathogens are responsible for a tremendous amount of foodborne illnesses every year through the consumption of contaminated food products. During their transit from contaminated food sources to the host gastrointestinal tract, these pathogens are exposed and must adapt to fluctuating oxygen levels to successfully colonize the host and cause diseases. However, the majority of enteric infection research has been conducted under aerobic conditions. To raise awareness of the importance in understanding the impact of oxygen, or lack of oxygen, on enteric pathogenesis, we describe in this review the metabolic and physiological responses of nine bacterial enteric pathogens exposed to environments with different oxygen levels. We further discuss the effects of oxygen levels on virulence regulation to establish potential connections between metabolic adaptations and bacterial pathogenesis. While not providing an exhaustive list of all bacterial pathogens, we highlight key differences and similarities among nine facultative anaerobic and microaerobic pathogens in this review to argue for a more in-depth understanding of the diverse impact oxygen levels have on enteric pathogenesis.
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Affiliation(s)
- N Wallace
- University of Dayton, Dayton, OH, United States
| | - A Zani
- University of Dayton, Dayton, OH, United States
| | - E Abrams
- University of Dayton, Dayton, OH, United States
| | - Y Sun
- University of Dayton, Dayton, OH, United States
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Luche S, Eymard-Vernain E, Diemer H, Van Dorsselaer A, Rabilloud T, Lelong C. Zinc oxide induces the stringent response and major reorientations in the central metabolism of Bacillus subtilis. J Proteomics 2015. [PMID: 26211718 DOI: 10.1016/j.jprot.2015.07.018] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Microorganisms, such as bacteria, are one of the first targets of nanoparticles in the environment. In this study, we tested the effect of two nanoparticles, ZnO and TiO2, with the salt ZnSO4 as the control, on the Gram-positive bacterium Bacillus subtilis by 2D gel electrophoresis-based proteomics. Despite a significant effect on viability (LD50), TiO2 NPs had no detectable effect on the proteomic pattern, while ZnO NPs and ZnSO4 significantly modified B. subtilis metabolism. These results allowed us to conclude that the effects of ZnO observed in this work were mainly attributable to Zn dissolution in the culture media. Proteomic analysis highlighted twelve modulated proteins related to central metabolism: MetE and MccB (cysteine metabolism), OdhA, AspB, IolD, AnsB, PdhB and YtsJ (Krebs cycle) and XylA, YqjI, Drm and Tal (pentose phosphate pathway). Biochemical assays, such as free sulfhydryl, CoA-SH and malate dehydrogenase assays corroborated the observed central metabolism reorientation and showed that Zn stress induced oxidative stress, probably as a consequence of thiol chelation stress by Zn ions. The other patterns affected by ZnO and ZnSO4 were the stringent response and the general stress response. Nine proteins involved in or controlled by the stringent response showed a modified expression profile in the presence of ZnO NPs or ZnSO4: YwaC, SigH, YtxH, YtzB, TufA, RplJ, RpsB, PdhB and Mbl. An increase in the ppGpp concentration confirmed the involvement of the stringent response during a Zn stress. All these metabolic reorientations in response to Zn stress were probably the result of complex regulatory mechanisms including at least the stringent response via YwaC.
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Affiliation(s)
- Sylvie Luche
- Pro-MD team, Université Joseph Fourier, CEA Grenoble, iRTSV, Laboratoire de Chimie et Biologie des Métaux, UMR CNRS-CEA-UJF, Grenoble, France
| | - Elise Eymard-Vernain
- Pro-MD team, Université Joseph Fourier, CEA Grenoble, iRTSV, Laboratoire de Chimie et Biologie des Métaux, UMR CNRS-CEA-UJF, Grenoble, France
| | - Hélène Diemer
- Laboratoire de Spectrométrie de Masse Bio-Organique, IPHC, Université de Strasbourg, 25 rue Becquerel, 67087 Strasbourg, France; CNRS, UMR7178, 67087 Strasbourg, France
| | - Alain Van Dorsselaer
- Laboratoire de Spectrométrie de Masse Bio-Organique, IPHC, Université de Strasbourg, 25 rue Becquerel, 67087 Strasbourg, France; CNRS, UMR7178, 67087 Strasbourg, France
| | - Thierry Rabilloud
- Pro-MD team, UMR CNRS 5249, Laboratoire de Chimie et Biologie des Métaux, UMR CNRS-CEA-UJF, Grenoble, France
| | - Cécile Lelong
- Pro-MD team, Université Joseph Fourier, CEA Grenoble, iRTSV, Laboratoire de Chimie et Biologie des Métaux, UMR CNRS-CEA-UJF, Grenoble, France.
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Oh YT, Lee KM, Bari W, Raskin DM, Yoon SS. (p)ppGpp, a Small Nucleotide Regulator, Directs the Metabolic Fate of Glucose in Vibrio cholerae. J Biol Chem 2015; 290:13178-90. [PMID: 25882848 DOI: 10.1074/jbc.m115.640466] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2015] [Indexed: 12/20/2022] Open
Abstract
When V. cholerae encounters nutritional stress, it activates (p)ppGpp-mediated stringent response. The genes relA and relV are involved in the production of (p)ppGpp, whereas the spoT gene encodes an enzyme that hydrolyzes it. Herein, we show that the bacterial capability to produce (p)ppGpp plays an essential role in glucose metabolism. The V. cholerae mutants defective in (p)ppGpp production (i.e. ΔrelAΔrelV and ΔrelAΔrelVΔspoT mutants) lost their viability because of uncontrolled production of organic acids, when grown with extra glucose. In contrast, the ΔrelAΔspoT mutant, a (p)ppGpp overproducer strain, exhibited better growth in the presence of the same glucose concentration. An RNA sequencing analysis demonstrated that transcriptions of genes consisting of an operon for acetoin biosynthesis were markedly elevated in N16961, a seventh pandemic O1 strain, but not in its (p)ppGpp(0) mutant during glucose-stimulated growth. Transposon insertion in acetoin biosynthesis gene cluster resulted in glucose-induced loss of viability of the ΔrelAΔspoT mutant, further suggesting the crucial role of acetoin production in balanced growth under glucose-rich environments. Additional deletion of the aphA gene, encoding a negative regulator for acetoin production, failed to rescue the (p)ppGpp(0) mutant from the defective glucose-mediated growth, suggesting that (p)ppGpp-mediated acetoin production occurs independent of the presence of AphA. Overall, our results reveal that (p)ppGpp, in addition to its well known role as a stringent response mediator, positively regulates acetoin production that contributes to the successful glucose metabolism and consequently the proliferation of V. cholerae cells under a glucose-rich environment, a condition that may mimic the human intestine.
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Affiliation(s)
- Young Taek Oh
- From the Department of Microbiology and Immunology, Brain Korea 21 PLUS Project for Medical Science and
| | - Kang-Mu Lee
- From the Department of Microbiology and Immunology, Brain Korea 21 PLUS Project for Medical Science and
| | - Wasimul Bari
- From the Department of Microbiology and Immunology, Brain Korea 21 PLUS Project for Medical Science and
| | - David M Raskin
- the Marian University College of Osteopathic Medicine, Indianapolis, Indiana 46222
| | - Sang Sun Yoon
- From the Department of Microbiology and Immunology, Brain Korea 21 PLUS Project for Medical Science and the Institute for Immunology and Immunological Diseases, Yonsei University College of Medicine, Seoul, 120-752, Korea and
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