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Castro VS, Ngo S, Stanford K. Influence of temperature and pH on induction of Shiga toxin Stx1a in Escherichia coli. Front Microbiol 2023; 14:1181027. [PMID: 37485504 PMCID: PMC10359099 DOI: 10.3389/fmicb.2023.1181027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2023] [Accepted: 06/20/2023] [Indexed: 07/25/2023] Open
Abstract
Shiga toxin-producing strains represent pathogenic group that is of concern in food production. The present study evaluated forty-eight E. coli isolates (11 with intact stx gene, while remaining isolates presented only stx-fragments) for Shiga toxin production. The four most expressive stx-producers (O26, O103, O145, and O157) were selected to evaluate effects of pH (3.5, 4.5, and 7) and temperature (35, 40, and 50°C). After determining acid stress effects in media on Stx-induction, we mimicked "in natura" conditions using milk, apple, and orange juices. Only isolates that showed the presence of intact stx gene (11/48) produced Shiga toxin. In addition, acid pH had a role in down-regulating the production of Shiga toxin, in both lactic acid and juices. In contrast, non-lethal heating (40°C), when in neutral pH and milk was a favorable environment to induce Shiga toxin. Lastly, two isolates (O26 and O103) showed a higher capacity to produce Shiga toxin and were included in a genomic cluster with other E. coli involved in worldwide foodborne outbreaks. The induction of this toxin when subjected to 40°C may represent a potential risk to the consumer, since the pathogenic effect of oral ingestion of Shiga toxin has already been proved in an animal model.
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Toppi V, Scattini G, Musa L, Stefanetti V, Pascucci L, Chiaradia E, Tognoloni A, Giovagnoli S, Franciosini MP, Branciari R, Proietti PC. Evaluation of β-Lactamase Enzyme Activity in Outer Membrane Vesicles (OMVs) Isolated from Extended Spectrum β-Lactamase (ESBL) Salmonella Infantis Strains. Antibiotics (Basel) 2023; 12:antibiotics12040744. [PMID: 37107107 PMCID: PMC10135247 DOI: 10.3390/antibiotics12040744] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2023] [Revised: 04/04/2023] [Accepted: 04/11/2023] [Indexed: 04/29/2023] Open
Abstract
Outer membrane vesicles (OMVs) are nanoparticles released by Gram-negative bacteria, which contain different cargo molecules and mediate several biological processes. Recent studies have shown that OMVs are involved in antibiotic-resistance (AR) mechanisms by including β-lactamase enzymes in their lumen. Since no studies have as yet been conducted on Salmonella enterica subs. enterica serovar Infantis' OMVs, the aim of the work was to collect OMVs from five S. Infantis β-lactam resistant strains isolated from a broiler meat production chain and to investigate whether β-lactamase enzymes are included in OMVs during their biogenesis. OMVs were isolated by means of ultrafiltration and a Nitrocefin assay quantified the presence of β-lactamase enzymes in the OMVs. Transmission electron microscopy (TEM) and dynamic light scattering (DLS) were used to identify the OMVs. The results showed that all strains release spherical OMVs, ranging from 60 to 230 nm. The Nitrocefin assay highlighted the presence of β-lactamase enzymes within the OMVs. This suggests that β-lactamase enzymes also get packaged into OMVs from bacterial periplasm during OMV biogenesis. An investigation into the possible role played by OMVs in AR mechanisms would open the door for an opportunity to develop new, therapeutic strategies.
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Affiliation(s)
- Valeria Toppi
- Department of Veterinary Medicine, University of Perugia, Via S. Costanzo 4, 06126 Perugia, Italy
| | - Gabriele Scattini
- Department of Veterinary Medicine, University of Perugia, Via S. Costanzo 4, 06126 Perugia, Italy
| | - Laura Musa
- Department of Veterinary Medicine, University of Perugia, Via S. Costanzo 4, 06126 Perugia, Italy
| | - Valentina Stefanetti
- Department of Veterinary Medicine, University of Perugia, Via S. Costanzo 4, 06126 Perugia, Italy
| | - Luisa Pascucci
- Department of Veterinary Medicine, University of Perugia, Via S. Costanzo 4, 06126 Perugia, Italy
| | - Elisabetta Chiaradia
- Department of Veterinary Medicine, University of Perugia, Via S. Costanzo 4, 06126 Perugia, Italy
| | - Alessia Tognoloni
- Department of Veterinary Medicine, University of Perugia, Via S. Costanzo 4, 06126 Perugia, Italy
| | - Stefano Giovagnoli
- Department of Pharmaceutical Sciences, University of Perugia, Via del Liceo 1, 06123 Perugia, Italy
| | - Maria Pia Franciosini
- Department of Veterinary Medicine, University of Perugia, Via S. Costanzo 4, 06126 Perugia, Italy
| | - Raffaella Branciari
- Department of Veterinary Medicine, University of Perugia, Via S. Costanzo 4, 06126 Perugia, Italy
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Noonin C, Peerapen P, Thongboonkerd V. Contamination of bacterial extracellular vesicles (bEVs) in human urinary extracellular vesicles (uEVs) samples and their effects on uEVs study. JOURNAL OF EXTRACELLULAR BIOLOGY 2022; 1:e69. [PMID: 38938597 PMCID: PMC11080850 DOI: 10.1002/jex2.69] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/08/2022] [Revised: 11/24/2022] [Accepted: 11/27/2022] [Indexed: 06/29/2024]
Abstract
Bacterial overgrowth is common for improperly stored urine. However, its effects on human urinary extracellular vesicles (uEVs) study had not been previously examined nor documented. This study investigated the presence of bacterial EVs (bEVs) contaminated in uEVs samples and their effects on uEVs study. Nanoscale uEVs were isolated from normal human urine immediately after collection (0-h) or after 25°C-storage with/without preservative (10 mM NaN3) for up to 24-h. Turbidity, bacterial count and total uEVs proteins abnormally increased in the 8-h and 24-h-stored urine without NaN3. NanoLC-ESI-LTQ-Orbitrap MS/MS identified 6-13 bacterial proteins in these contaminated uEVs samples. PCR also detected bacterial DNAs in these contaminated uEVs samples. Besides, uEVs derived from 8-h and 24-h urine without NaN3 induced macrophage activation (CD11b and phagocytosis) and secretion of cytokines (IFN-α, IL-8, and TGF-β) from macrophages and renal cells (HEK-293, HK-2, and MDCK). All of these effects induced by bacterial contamination were partially/completely prevented by NaN3. Interestingly, macrophage activation and cytokine secretion were also induced by bEVs purified from Escherichia coli. This study clearly shows evidence of bEVs contamination and their effects on human uEVs study when the urine samples were inappropriately stored, whereas NaN3 can partially/completely prevent such effects from the contaminated bEVs.
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Affiliation(s)
- Chadanat Noonin
- Medical Proteomics Unit, Office for Research and Development, Faculty of Medicine Siriraj HospitalMahidol UniversityBangkokThailand
| | - Paleerath Peerapen
- Medical Proteomics Unit, Office for Research and Development, Faculty of Medicine Siriraj HospitalMahidol UniversityBangkokThailand
| | - Visith Thongboonkerd
- Medical Proteomics Unit, Office for Research and Development, Faculty of Medicine Siriraj HospitalMahidol UniversityBangkokThailand
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4
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Li Y, Guo Z, Xu T, Zhang Y, Zeng L, Huang X, Liu Q. Extracellular vesicles, a novel model linking bacteria to ferroptosis in the future? Appl Microbiol Biotechnol 2022; 106:7377-7386. [PMID: 36216901 DOI: 10.1007/s00253-022-12228-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2022] [Revised: 10/03/2022] [Accepted: 10/04/2022] [Indexed: 11/29/2022]
Abstract
Ferroptosis is a recently discovered modulated cell death mechanism caused by the accumulation of iron-dependent lipid peroxides to toxic levels and plays an important role in tumor immunology and neurology. Recent studies have shown that ferroptosis may play a crucial role in bacterial infection pathogenesis, which may be useful in anti-infection therapies. However, how bacteria enter cells to induce ferroptosis after invading the host immune system remains largely unknown. In addition, the current studies only focus on the relationship between a single bacterial species or genus and host cell ferroptosis, and there is no systematic summary of its regulatory mechanism. Therefore, our review firstly sums up the role of ferroptosis in bacterial infection and its regulatory mechanism, and innovatively speculates on the function and potential mechanism of extracellular vesicles (EVs) in bacterial-induced ferroptosis, in order to provide possible novel directions and ideas for future anti-infection research. KEY POINTS: • Ferroptosis presents a novel mechanism for bacterial host interaction • EVs provide the potential mechanism for bacterial-induced ferroptosis • The relationship of EVs with ferroptosis provides possible directions for future treatment of bacterial infection.
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Affiliation(s)
- Yi Li
- Department of Medical Microbiology, School of Medicine, Jiangxi Medical College, Nanchang University, Nanchang, 330006, China.,The First Clinical Medical College, Nanchang University, Nanchang, 30006, China
| | - Zhicheng Guo
- Department of Medical Microbiology, School of Medicine, Jiangxi Medical College, Nanchang University, Nanchang, 330006, China.,The First Clinical Medical College, Nanchang University, Nanchang, 30006, China
| | - Tian Xu
- Department of Medical Microbiology, School of Medicine, Jiangxi Medical College, Nanchang University, Nanchang, 330006, China
| | - Yejia Zhang
- Department of Medical Microbiology, School of Medicine, Jiangxi Medical College, Nanchang University, Nanchang, 330006, China
| | - Lingbing Zeng
- Department of Medical Microbiology, School of Medicine, Jiangxi Medical College, Nanchang University, Nanchang, 330006, China.,The First Clinical Medical College, Nanchang University, Nanchang, 30006, China
| | - Xiaotian Huang
- Department of Medical Microbiology, School of Medicine, Jiangxi Medical College, Nanchang University, Nanchang, 330006, China.
| | - Qiong Liu
- Department of Medical Microbiology, School of Medicine, Jiangxi Medical College, Nanchang University, Nanchang, 330006, China.
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5
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Li Q, Li Z, Fei X, Tian Y, Zhou G, Hu Y, Wang S, Shi H. The role of TolA, TolB, and TolR in cell morphology, OMVs production, and virulence of Salmonella Choleraesuis. AMB Express 2022; 12:5. [PMID: 35075554 PMCID: PMC8787014 DOI: 10.1186/s13568-022-01347-4] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2021] [Accepted: 01/15/2022] [Indexed: 01/12/2023] Open
Abstract
The Tol–Pal system of Gram-negative bacteria is necessary for maintaining outer membrane integrity. It is a multiprotein complex of five envelope proteins, TolQ, TolR, TolA, TolB, and Pal. These proteins were first investigated in E. coli, and subsequently been identified in many other bacterial genera. However, the function of the Tol–Pal system in Salmonella Choleraesuis pathogenesis is still unclear. Here, we reported the role of three of these proteins in the phenotype and biology of S. Choleraesuis. We found that mutations in tolA, tolB, and tolR caused severe damage to the cell wall, which was supported by observing the microstructure of spherical forms, long chains, flagella defects, and membrane blebbing. We confirmed that all the mutants significantly decreased S. Choleraesuis survival when exposed to sodium deoxycholate and exhibited a high sensitivity to vancomycin, which may be explained by the disruption of envelope integrity. In addition, tolA, tolB, and tolR mutants displayed attenuated virulence in a mouse infection model. This could be interpreted as a series of defective phenotypes in the mutants, such as severe defects in envelope integrity, growth, and motility. Further investigation showed that all the genes participate in outer membrane vesicles (OMVs) biogenesis. Interestingly, immunization with OMVs from ΔtolB efficiently enhanced murine viability in contrast to OMVs from the wild-type S. Choleraesuis, suggesting its potential use in vaccination strategies. Collectively, this study provides an insight into the biological role of the S. Choleraesuis Tol–Pal system.
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Liang L, Fu Y, Deng S, Wu Y, Gao M. Genomic, Antimicrobial, and Aphicidal Traits of Bacillus velezensis ATR2, and Its Biocontrol Potential against Ginger Rhizome Rot Disease Caused by Bacillus pumilus. Microorganisms 2021; 10:microorganisms10010063. [PMID: 35056513 PMCID: PMC8778260 DOI: 10.3390/microorganisms10010063] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2021] [Revised: 12/10/2021] [Accepted: 12/23/2021] [Indexed: 11/27/2022] Open
Abstract
Ginger rhizome rot disease, caused by the pathogen Bacilluspumilus GR8, could result in severe rot of ginger rhizomes and heavily threaten ginger production. In this study, we identified and characterized a new Bacillus velezensis strain, designated ATR2. Genome analysis revealed B. velezensis ATR2 harbored a series of genes closely related to promoting plant growth and triggering plant immunity. Meanwhile, ten gene clusters involved in the biosynthesis of various secondary metabolites (surfactin, bacillomycin, fengycin, bacillibactin, bacilysin, difficidin, macrolactin, bacillaene, plantazolicin, and amylocyclicin) and two clusters encoding a putative lipopeptide and a putative phosphonate which might be explored as novel bioactive compounds were also present in the ATR2 genome. Moreover, B. velezensis ATR2 showed excellent antagonistic activities against multiple plant pathogenic bacteria, plant pathogenic fungi, human pathogenic bacteria, and human pathogenic fungus. B. velezensis ATR2 was also efficacious in control of aphids. The antagonistic compound from B. velezensis ATR2 against B.pumilus GR8 was purified and identified as bacillomycin D. In addition, B. velezensis ATR2 exhibited excellent biocontrol efficacy against ginger rhizome rot disease on ginger slices. These findings showed the potential of further applications of B. velezensis ATR2 as a biocontrol agent in agricultural diseases and pests management.
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Affiliation(s)
- Leiqin Liang
- Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan 430071, China; (L.L.); (Y.F.); (S.D.); (Y.W.)
- University of Chinese Academy of Sciences, Beijing 100039, China
| | - Yajuan Fu
- Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan 430071, China; (L.L.); (Y.F.); (S.D.); (Y.W.)
- University of Chinese Academy of Sciences, Beijing 100039, China
| | - Sangsang Deng
- Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan 430071, China; (L.L.); (Y.F.); (S.D.); (Y.W.)
- University of Chinese Academy of Sciences, Beijing 100039, China
| | - Yan Wu
- Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan 430071, China; (L.L.); (Y.F.); (S.D.); (Y.W.)
| | - Meiying Gao
- Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan 430071, China; (L.L.); (Y.F.); (S.D.); (Y.W.)
- Correspondence:
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7
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Zhang K, Chu P, Song S, Yang D, Bian Z, Li Y, Gou H, Jiang Z, Cai R, Li C. Proteome Analysis of Outer Membrane Vesicles From a Highly Virulent Strain of Haemophilus parasuis. Front Vet Sci 2021; 8:756764. [PMID: 34901247 PMCID: PMC8662722 DOI: 10.3389/fvets.2021.756764] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2021] [Accepted: 10/25/2021] [Indexed: 11/13/2022] Open
Abstract
Haemophilus parasuis has emerged as an important bacterial pathogen in pig husbandry, as H. parasuis can coinfect pigs with a variety of pathogenic microorganisms and further cause an aggravation of the disease. It is crucial to investigate its pathogenetic mechanism. Gram-negative bacteria naturally secrete outer membrane vesicles (OMVs), and their potent virulence factors play prominent roles that affect the interaction between bacteria and host. Still, the pathogenesis that is associated with the bacterial OMVs has not been well-elucidated. In this study, we investigated the secretion of OMVs from a clinical H. parasuis isolate strain (H45). In addition, we further analyzed the characterization, the comprehensive proteome, and the virulence potential of OMVs. Our data demonstrated that H. parasuis could secrete OMVs into the extracellular milieu during infection. Using liquid chromatography with tandem mass spectrometry (MS/MS) identification and bio-information analysis, we identified 588 different proteins associated with OMVs. Also, we also analyzed the subcellular location and biological function of those proteins. These proteins are mainly involved in immune and iron metabolism. Moreover, we confirmed the pathogenicity of H. parasuis OMVs by observing a strong inflammatory response in J774A.1 and porcine alveolar macrophages. Taken together, our findings suggested that OMVs from H. parasuis were involved in the pathogenesis of this bacterium during infection.
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Affiliation(s)
- Kunli Zhang
- Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Key Laboratory of Livestock Disease Prevention of Guangdong Province, Scientific Observation and Experiment Station of Veterinary Drugs and Diagnostic Techniques of Guangdong Province, Ministry of Agriculture and Rural Affairs, Guangzhou, China.,Maoming Branch, Guangdong Laboratory for Lingnan Modern Agriculture, Guangdong, China
| | - Pinpin Chu
- Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Key Laboratory of Livestock Disease Prevention of Guangdong Province, Scientific Observation and Experiment Station of Veterinary Drugs and Diagnostic Techniques of Guangdong Province, Ministry of Agriculture and Rural Affairs, Guangzhou, China.,Maoming Branch, Guangdong Laboratory for Lingnan Modern Agriculture, Guangdong, China
| | - Shuai Song
- Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Key Laboratory of Livestock Disease Prevention of Guangdong Province, Scientific Observation and Experiment Station of Veterinary Drugs and Diagnostic Techniques of Guangdong Province, Ministry of Agriculture and Rural Affairs, Guangzhou, China.,Maoming Branch, Guangdong Laboratory for Lingnan Modern Agriculture, Guangdong, China
| | - Dongxia Yang
- Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Key Laboratory of Livestock Disease Prevention of Guangdong Province, Scientific Observation and Experiment Station of Veterinary Drugs and Diagnostic Techniques of Guangdong Province, Ministry of Agriculture and Rural Affairs, Guangzhou, China.,Maoming Branch, Guangdong Laboratory for Lingnan Modern Agriculture, Guangdong, China
| | - Zhibiao Bian
- Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Key Laboratory of Livestock Disease Prevention of Guangdong Province, Scientific Observation and Experiment Station of Veterinary Drugs and Diagnostic Techniques of Guangdong Province, Ministry of Agriculture and Rural Affairs, Guangzhou, China.,Maoming Branch, Guangdong Laboratory for Lingnan Modern Agriculture, Guangdong, China
| | - Yan Li
- Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Key Laboratory of Livestock Disease Prevention of Guangdong Province, Scientific Observation and Experiment Station of Veterinary Drugs and Diagnostic Techniques of Guangdong Province, Ministry of Agriculture and Rural Affairs, Guangzhou, China.,Maoming Branch, Guangdong Laboratory for Lingnan Modern Agriculture, Guangdong, China
| | - Hongchao Gou
- Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Key Laboratory of Livestock Disease Prevention of Guangdong Province, Scientific Observation and Experiment Station of Veterinary Drugs and Diagnostic Techniques of Guangdong Province, Ministry of Agriculture and Rural Affairs, Guangzhou, China.,Maoming Branch, Guangdong Laboratory for Lingnan Modern Agriculture, Guangdong, China
| | - Zhiyong Jiang
- Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Key Laboratory of Livestock Disease Prevention of Guangdong Province, Scientific Observation and Experiment Station of Veterinary Drugs and Diagnostic Techniques of Guangdong Province, Ministry of Agriculture and Rural Affairs, Guangzhou, China.,Maoming Branch, Guangdong Laboratory for Lingnan Modern Agriculture, Guangdong, China
| | - Rujian Cai
- Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Key Laboratory of Livestock Disease Prevention of Guangdong Province, Scientific Observation and Experiment Station of Veterinary Drugs and Diagnostic Techniques of Guangdong Province, Ministry of Agriculture and Rural Affairs, Guangzhou, China.,Maoming Branch, Guangdong Laboratory for Lingnan Modern Agriculture, Guangdong, China
| | - Chunling Li
- Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Key Laboratory of Livestock Disease Prevention of Guangdong Province, Scientific Observation and Experiment Station of Veterinary Drugs and Diagnostic Techniques of Guangdong Province, Ministry of Agriculture and Rural Affairs, Guangzhou, China.,Maoming Branch, Guangdong Laboratory for Lingnan Modern Agriculture, Guangdong, China
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8
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Qiao L, Rao Y, Zhu K, Rao X, Zhou R. Engineered Remolding and Application of Bacterial Membrane Vesicles. Front Microbiol 2021; 12:729369. [PMID: 34690971 PMCID: PMC8532528 DOI: 10.3389/fmicb.2021.729369] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2021] [Accepted: 08/31/2021] [Indexed: 11/14/2022] Open
Abstract
Bacterial membrane vesicles (MVs) are produced by both Gram-positive and Gram-negative bacteria during growth in vitro and in vivo. MVs are nanoscale vesicular structures with diameters ranging from 20 to 400 nm. MVs incorporate bacterial lipids, proteins, and often nucleic acids, and can effectively stimulate host immune response against bacterial infections. As vaccine candidates and drug delivery systems, MVs possess high biosafety owing to the lack of self-replication ability. However, wild-type bacterial strains have poor MV yield, and MVs from the wild-type strains may be harmful due to the carriage of toxic components, such as lipopolysaccharides, hemolysins, enzymes, etc. In this review, we summarize the genetic modification of vesicle-producing bacteria to reduce MV toxicity, enhance vesicle immunogenicity, and increase vesicle production. The engineered MVs exhibit broad applications in vaccine designs, vaccine delivery vesicles, and drug delivery systems.
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Affiliation(s)
- Li Qiao
- Department of Emergency, Xinqiao Hospital, Army Medical University, Chongqing, China
| | - Yifan Rao
- Department of Emergency, Xinqiao Hospital, Army Medical University, Chongqing, China
| | - Keting Zhu
- Department of Emergency, Xinqiao Hospital, Army Medical University, Chongqing, China
| | - Xiancai Rao
- Department of Microbiology, College of Basic Medical Sciences, Key Laboratory of Microbial Engineering Under the Educational Committee in Chongqing, Army Medical University, Chongqing, China
| | - Renjie Zhou
- Department of Emergency, Xinqiao Hospital, Army Medical University, Chongqing, China
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9
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Schorey JS, Cheng Y, McManus WR. Bacteria- and host-derived extracellular vesicles - two sides of the same coin? J Cell Sci 2021; 134:268991. [PMID: 34081134 DOI: 10.1242/jcs.256628] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Intracellular bacterial pathogens spend portions of their life cycle both inside and outside host cells. While in these two distinct environments, they release or shed bacterial components, including virulence factors that promote their survival and replication. Some of these components are released through extracellular vesicles, which are either derived from the bacteria themselves or from the host cells. Bacteria- and host-derived vesicles have been studied almost exclusively in isolation from each other, with little discussion of the other type of secreted vesicles, despite the fact that both are generated during an in vivo infection and both are likely play a role in bacterial pathogenesis and host immunity. In this Review, we aim to bridge this gap and discuss what we know of bacterial membrane vesicles in their generation and composition. We will compare and contrast this with the composition of host-derived vesicles with regard to bacterial components. We will also compare host cell responses to the different vesicles, with a focus on how these vesicles modulate the immune response, using Mycobacterium, Listeria and Salmonella as specific examples for these comparisons.
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Affiliation(s)
- Jeffrey S Schorey
- Department of Biological Sciences, Galvin Life Science Center, University of Notre Dame, Notre Dame, IN 46556, USA
| | - Yong Cheng
- Department of Biochemistry and Molecular Biology, Noble Research Center, Oklahoma State University, Stillwater, OK 74078, USA
| | - William R McManus
- Department of Biological Sciences, Galvin Life Science Center, University of Notre Dame, Notre Dame, IN 46556, USA
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10
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Comparative proteomic analysis of outer membrane vesicles from Brucella suis, Brucella ovis, Brucella canis and Brucella neotomae. Arch Microbiol 2021; 203:1611-1626. [PMID: 33432377 PMCID: PMC7799404 DOI: 10.1007/s00203-020-02170-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2020] [Revised: 10/22/2020] [Accepted: 12/27/2020] [Indexed: 01/18/2023]
Abstract
Gram-negative bacteria release nanovesicles, called outer membrane vesicles (OMVs), from their outer membrane. Proteomics has been used to determine their composition. OMVs contain proteins able to elicit an immune response, so they have been proposed as a model to develop acellular vaccines. In this study, OMVs of Brucella suis, B. ovis, B. canis, and B. neotomae were purified and analyzed by SDS-PAGE, transmission electron microscopy and liquid chromatography coupled to mass spectrometry to determine the pan-proteome of these vesicles. In addition, antigenic proteins were detected by western blot with anti-Brucella sera. The in silico analysis of the pan-proteome revealed many homologous proteins, such as Omp16, Omp25, Omp31, SodC, Omp2a, and BhuA. Proteins contained in the vesicles from different Brucella species were detected by anti-Brucella sera. The occurrence of previously described immunogenic proteins derived from OMVs supports the use of these vesicles as candidates to be evaluated as an acellular brucellosis vaccine.
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11
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Rueter C, Bielaszewska M. Secretion and Delivery of Intestinal Pathogenic Escherichia coli Virulence Factors via Outer Membrane Vesicles. Front Cell Infect Microbiol 2020; 10:91. [PMID: 32211344 PMCID: PMC7068151 DOI: 10.3389/fcimb.2020.00091] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2019] [Accepted: 02/21/2020] [Indexed: 12/14/2022] Open
Abstract
Outer membrane vesicles (OMVs) are nanoscale proteoliposomes secreted from the cell envelope of all Gram-negative bacteria. Originally considered as an artifact of the cell wall, OMVs are now recognized as a general secretion system, which serves to improve the fitness of bacteria and facilitate bacterial interactions in polymicrobial communities as well as interactions between the microbe and the host. In general, OMVs are released in increased amounts from pathogenic bacteria and have been found to harbor much of the contents of the parental bacterium. They mainly encompass components of the outer membrane and the periplasm including various virulence factors such as toxins, adhesins, and immunomodulatory molecules. Numerous studies have clearly shown that the delivery of toxins and other virulence factors via OMVs essentially influences their interactions with host cells. Here, we review the OMV-mediated intracellular deployment of toxins and other virulence factors with a special focus on intestinal pathogenic Escherichia coli. Especially, OMVs ubiquitously produced and secreted by enterohemorrhagic E. coli (EHEC) appear as a highly advanced mechanism for secretion and simultaneous, coordinated and direct delivery of bacterial virulence factors into host cells. OMV-associated virulence factors are not only stabilized by the association with OMVs, but can also often target previously unknown target structures and perform novel activities. The toxins are released by OMVs in their active forms and are transported via cell sorting processes to their specific cell compartments, where they can develop their detrimental effects. OMVs can be considered as bacterial “long distance weapons” that attack host tissues and help bacterial pathogens to establish the colonization of their biological niche(s), impair host cell function, and modulate the defense of the host. Thus, OMVs contribute significantly to the virulence of the pathogenic bacteria.
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Affiliation(s)
- Christian Rueter
- Center for Molecular Biology of Inflammation (ZMBE), Institute of Infectiology, University of Muenster, Münster, Germany
| | - Martina Bielaszewska
- National Institute of Public Health, Reference Laboratory for E. coli and Shigellae, Prague, Czechia.,Institute for Hygiene, University Hospital of Muenster, University of Muenster, Münster, Germany
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12
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Sudhakar P, Jacomin AC, Hautefort I, Samavedam S, Fatemian K, Ari E, Gul L, Demeter A, Jones E, Korcsmaros T, Nezis IP. Targeted interplay between bacterial pathogens and host autophagy. Autophagy 2019; 15:1620-1633. [PMID: 30909843 PMCID: PMC6693458 DOI: 10.1080/15548627.2019.1590519] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2017] [Revised: 02/21/2019] [Accepted: 03/01/2019] [Indexed: 12/12/2022] Open
Abstract
Due to the critical role played by autophagy in pathogen clearance, pathogens have developed diverse strategies to subvert it. Despite previous key findings of bacteria-autophagy interplay, asystems-level insight into selective targeting by the host and autophagy modulation by the pathogens is lacking. We predicted potential interactions between human autophagy proteins and effector proteins from 56 pathogenic bacterial species by identifying bacterial proteins predicted to have recognition motifs for selective autophagy receptors SQSTM1/p62, CALCOCO2/NDP52 and MAP1LC3/LC3. Using structure-based interaction prediction, we identified bacterial proteins capable to modify core autophagy components. Our analysis revealed that autophagy receptors in general potentially target mostly genus-specific proteins, and not those present in multiple genera. The complementarity between the predicted SQSTM1/p62 and CALCOCO2/NDP52 targets, which has been shown for Salmonella, Listeria and Shigella, could be observed across other pathogens. This complementarity potentially leaves the host more susceptible to chronic infections upon the mutation of autophagy receptors. Proteins derived from enterotoxigenic and non-toxigenic Bacillus outer membrane vesicles indicated that autophagy targets pathogenic proteins rather than non-pathogenic ones. We also observed apathogen-specific pattern as to which autophagy phase could be modulated by specific genera. We found intriguing examples of bacterial proteins that could modulate autophagy, and in turn being targeted by autophagy as ahost defense mechanism. We confirmed experimentally an interplay between a Salmonella protease, YhjJ and autophagy. Our comparative meta-analysis points out key commonalities and differences in how pathogens could affect autophagy and how autophagy potentially recognizes these pathogenic effectors. Abbreviations: ATG5: autophagy related 5; CALCOCO2/NDP52: calcium binding and coiled-coil domain 2; GST: glutathione S-transferase; LIR: MAP1LC3/LC3-interacting region; MAP1LC3/LC3: microtubule associated protein 1 light chain 3 alpha; OMV: outer membrane vesicles; SQSTM1/p62: sequestosome 1; SCV: Salmonella containing vesicle; TECPR1: tectonin beta-propeller repeat containing 1; YhjJ: hypothetical zinc-protease.
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Affiliation(s)
- Padhmanand Sudhakar
- Earlham Institute, Norwich Research Park, Norwich, UK
- Gut Health and Microbes Programme, Quadram Institute, Norwich Research Park, Norwich, UK
- Department of Chronic Diseases, Metabolism and Ageing, KU Leuven, Leuven, Belgium
| | | | | | - Siva Samavedam
- School of Life Sciences, University of Warwick, Coventry, UK
| | - Koorosh Fatemian
- School of Life Sciences, University of Warwick, Coventry, UK
- Current affiliation:Exaelements LTD, Coventry, UK
| | - Eszter Ari
- Department of Genetics, Eotvos Lorand University, Budapest, Hungary
- Synthetic and System Biology Unit, Institute of Biochemistry, Biological Research Centre of the Hungarian Academy of Sciences, Szeged, Hungary
| | - Leila Gul
- Earlham Institute, Norwich Research Park, Norwich, UK
| | - Amanda Demeter
- Earlham Institute, Norwich Research Park, Norwich, UK
- Gut Health and Microbes Programme, Quadram Institute, Norwich Research Park, Norwich, UK
- Department of Genetics, Eotvos Lorand University, Budapest, Hungary
| | - Emily Jones
- Earlham Institute, Norwich Research Park, Norwich, UK
- Gut Health and Microbes Programme, Quadram Institute, Norwich Research Park, Norwich, UK
| | - Tamas Korcsmaros
- Earlham Institute, Norwich Research Park, Norwich, UK
- Gut Health and Microbes Programme, Quadram Institute, Norwich Research Park, Norwich, UK
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Wang H, Liang K, Kong Q, Liu Q. Immunization with outer membrane vesicles of avian pathogenic Escherichia coli O78 induces protective immunity in chickens. Vet Microbiol 2019; 236:108367. [PMID: 31500727 DOI: 10.1016/j.vetmic.2019.07.019] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2019] [Revised: 07/08/2019] [Accepted: 07/20/2019] [Indexed: 01/31/2023]
Abstract
Avian pathogenic Escherichia coli (APEC) typically causes colibacillosis and is a major concern for the poultry industry and public health. As a vaccine platform, the outer membrane vesicles (OMVs) derived from various gram-negative bacteria and even some gram-positive bacteria have been reported to be immunogenic in laboratories or upon commercial usage worldwide. Here, we purified OMVs from APEC serotype O78 strain by ultracentrifugation and gradient isolation. By SDS-PAGE and LC-MS/MS analysis, the 20 most abundant proteins located on OMVs were identified and analyzed; the lipopolysaccharide (LPS) profiles of OMVs were not different from those of the bacteria. Moreover, three groups of chickens were immunized with OMV-, outer membrane protein (OMP)- and PBS, with the latter two serving as positive and negative controls, respectively. By analyzing the anti-OMP and anti-LPS IgG titers stimulated by the tested vaccine candidates, the macrophage opsonophagocytic activity and the bactericidal activity mediated by serum antibodies in vaccinated chickens, we found that the OMV-vaccinated chicken group was superior to the two other groups. These findings were confirmed by additional chicken challenge tests, in which all OMV-vaccinated group chickens obtained complete protection but those of the other two groups were barely protected. Our data demonstrate that native APEC O78 OMVs can induce protective immunity in chickens and therefore be used as a candidate vaccine for APEC serotype O78 strain infections.
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Affiliation(s)
- Haoju Wang
- College of Veterinary Science and Technology, Southwest University, Chongqing, 400700, China; Chongqing Engineering Research Center for Herbivores Resource Protection and Utilization, Chongqing, 400700, China
| | - Kang Liang
- College of Veterinary Science and Technology, Southwest University, Chongqing, 400700, China
| | - Qingke Kong
- College of Veterinary Science and Technology, Southwest University, Chongqing, 400700, China
| | - Qing Liu
- College of Veterinary Science and Technology, Southwest University, Chongqing, 400700, China; Chongqing Engineering Research Center for Herbivores Resource Protection and Utilization, Chongqing, 400700, China.
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