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Virulence Induction in Pseudomonas aeruginosa under Inorganic Phosphate Limitation: a Proteomics Perspective. Microbiol Spectr 2022; 10:e0259022. [PMID: 36354317 PMCID: PMC9769906 DOI: 10.1128/spectrum.02590-22] [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] [Indexed: 11/12/2022] Open
Abstract
Inorganic phosphate (Pi) is a central nutrient and signal molecule for bacteria. Pi limitation was shown to increase the virulence of several phylogenetically diverse pathogenic bacteria with different lifestyles. Hypophosphatemia enhances the risk of death in patients due to general bacteremia and was observed after surgical injury in humans. Phosphate therapy, or the reduction of bacterial virulence by the administration of Pi or phosphate-containing compounds, is a promising anti-infective therapy approach that will not cause cytotoxicity or the emergence of antibiotic-resistant strains. The proof of concept of phosphate therapy has been obtained using primarily Pseudomonas aeruginosa (PA). However, a detailed understanding of Pi-induced changes at protein levels is missing. Using pyocyanin production as proxy, we show that the Pi-mediated induction of virulence is a highly cooperative process that occurs between 0.2 to 0.6 mM Pi. We present a proteomics study of PA grown in minimal medium supplemented with either 0.2 mM or 1 mM Pi and rich medium. About half of the predicted PA proteins could be quantified. Among the 1,471 dysregulated proteins comparing growth in 0.2 mM to 1 mM Pi, 1,100 were depleted under Pi-deficient conditions. Most of these proteins are involved in general and energy metabolism, different biosynthetic and catabolic routes, or transport. Pi depletion caused accumulation of proteins that belong to all major families of virulence factors, including pyocyanin synthesis, secretion systems, quorum sensing, chemosensory signaling, and the secretion of proteases, phospholipases, and phosphatases, which correlated with an increase in exoenzyme production and antibacterial activity. IMPORTANCE Antibiotics are our main weapons to fight pathogenic bacteria, but the increase in antibiotic-resistant strains and their consequences represents a major global health challenge, revealing the necessity to develop alternative antimicrobial strategies that do not involve the bacterial killing or growth inhibition. P. aeruginosa has been placed second on the global priority list to guide research on the development of new antibiotics. One of the most promising alternative strategies is the phosphate therapy for which the proof of concept has been obtained for P. aeruginosa. This article reports the detailed changes at the protein levels comparing P. aeruginosa grown under Pi-abundant and Pi-depleted conditions. These data describe in detail the molecular mechanisms underlying phosphate therapy. Apart from Pi, several other phosphate-containing compounds have been used for phosphate therapy and this study will serve as a reference for comparative studies aimed at evaluating the effect of alternative compounds.
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Wang H, Smith A, Lovelace A, Kvitko BH. In planta transcriptomics reveals conflicts between pattern-triggered immunity and the AlgU sigma factor regulon. PLoS One 2022; 17:e0274009. [PMID: 36048876 PMCID: PMC9436044 DOI: 10.1371/journal.pone.0274009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2022] [Accepted: 08/20/2022] [Indexed: 11/18/2022] Open
Abstract
In previous work, we determined the transcriptomic impacts of flg22 pre-induced Pattern Triggered Immunity (PTI) in Arabidopsis thaliana on the pathogen Pseudomonas syringae pv. tomato DC3000 (Pto). During PTI exposure we observed expression patterns in Pto reminiscent of those previously observed in a Pto algU mutant. AlgU is a conserved extracytoplasmic function sigma factor which has been observed to regulate over 950 genes in Pto in growth media. We sought to identify the AlgU regulon when the bacteria are inside the plant host and which PTI-regulated genes overlapped with AlgU-regulated genes. In this study, we analyzed transcriptomic data from RNA-sequencing to identify the AlgU regulon (while in the host) and its relationship with PTI. Our results showed that the upregulation of 224 genes while inside the plant host require AlgU, while another 154 genes are downregulated dependent on AlgU in Arabidopsis during early infection. Both stress response and virulence-associated genes were upregulated in a manner dependent on AlgU, while the flagellar motility genes are downregulated in a manner dependent on AlgU. Under the pre-induced PTI condition, more than half of these AlgU-regulated genes have lost induction/suppression in contrast to mock treated plants, and almost all function groups regulated by AlgU were affected by PTI.
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Affiliation(s)
- Haibi Wang
- Department of Plant Pathology, University of Georgia, Athens, Georgia, United States of America
| | - Amy Smith
- Department of Plant Pathology, University of Georgia, Athens, Georgia, United States of America
| | - Amelia Lovelace
- The Sainsbury Laboratory, Norwich Research Park, Norwich, United Kingdom
| | - Brian H. Kvitko
- Department of Plant Pathology, University of Georgia, Athens, Georgia, United States of America
- The Plant Center, University of Georgia, Athens, Georgia, United States of America
- * E-mail:
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Constantino-Teles P, Jouault A, Touqui L, Saliba AM. Role of Host and Bacterial Lipids in Pseudomonas aeruginosa Respiratory Infections. Front Immunol 2022; 13:931027. [PMID: 35860265 PMCID: PMC9289105 DOI: 10.3389/fimmu.2022.931027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2022] [Accepted: 06/07/2022] [Indexed: 11/13/2022] Open
Abstract
The opportunistic pathogen Pseudomonas aeruginosa is one of the most common agents of respiratory infections and has been associated with high morbidity and mortality rates. The ability of P. aeruginosa to cause severe respiratory infections results from the coordinated action of a variety of virulence factors that promote bacterial persistence in the lungs. Several of these P. aeruginosa virulence mechanisms are mediated by bacterial lipids, mainly lipopolysaccharide, rhamnolipid, and outer membrane vesicles. Other mechanisms arise from the activity of P. aeruginosa enzymes, particularly ExoU, phospholipase C, and lipoxygenase A, which modulate host lipid signaling pathways. Moreover, host phospholipases, such as cPLA2α and sPLA2, are also activated during the infectious process and play important roles in P. aeruginosa pathogenesis. These mechanisms affect key points of the P. aeruginosa-host interaction, such as: i) biofilm formation that contributes to bacterial colonization and survival, ii) invasion of tissue barriers that allows bacterial dissemination, iii) modulation of inflammatory responses, and iv) escape from host defenses. In this mini-review, we present the lipid-based mechanism that interferes with the establishment of P. aeruginosa in the lungs and discuss how bacterial and host lipids can impact the outcome of P. aeruginosa respiratory infections.
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Affiliation(s)
- Pamella Constantino-Teles
- Department of Microbiology, Immunology and Parasitology, Faculty of Medical Sciences, Rio de Janeiro State University, Rio de Janeiro, Brazil
| | - Albane Jouault
- Sorbonne Université, Centre de Recherche Saint-Antoine, Inserm, Institut Pasteur, Mucoviscidose et Bronchopathies Chroniques, Département Santé Globale, Paris, France
| | - Lhousseine Touqui
- Sorbonne Université, Centre de Recherche Saint-Antoine, Inserm, Institut Pasteur, Mucoviscidose et Bronchopathies Chroniques, Département Santé Globale, Paris, France
| | - Alessandra Mattos Saliba
- Department of Microbiology, Immunology and Parasitology, Faculty of Medical Sciences, Rio de Janeiro State University, Rio de Janeiro, Brazil
- *Correspondence: Alessandra Mattos Saliba,
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Peng Y, Gao M, Liu Y, Qiu X, Cheng X, Yang X, Chen F, Wang E. Bacterial outer membrane vesicles induce disseminated intravascular coagulation through the caspase-11-gasdermin D pathway. Thromb Res 2020; 196:159-166. [PMID: 32882448 DOI: 10.1016/j.thromres.2020.08.013] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Revised: 07/18/2020] [Accepted: 08/06/2020] [Indexed: 12/21/2022]
Abstract
BACKGROUND Disseminated intravascular coagulation (DIC), a severe complication of sepsis, promotes multiple organ dysfunctions and lethality. Bacterial infection is the most common cause of sepsis. We previously show an important role of bacteria-released outer membrane vesicles (OMVs) in bacterial infection-induced DIC. In the light of recent advance that activation of caspase-11 and its enzymatic substrate gasdermin D (GSDMD) is able to trigger coagulation, we postulate that OMVs might induce DIC through the caspase-11-GSDMD pathway. METHODS Caspase-11- or GSDMD-deficient mice and their wild-type (WT) controls were injected with purified Escherichia coli-derived OMVs. Blood samples were then collected. The development of DIC was assessed in terms of the occurrence of coagulopathy, the organ injuries and the lethality. Peritoneal macrophages derived from WT, Caspase-11- or GSDMD-deficient mice were stimulated with OMVs. Then the cell surface tissue factor (TF) activity and thrombin generation were assessed. RESULTS Genetic deletion of Caspase-11 or GSDMD or pharmacological inhibition of caspase-11 markedly attenuated OMVs-induced coagulopathy, multiple organ injuries and mortality. Caspase-11- or GSDMD-deficient macrophages exhibited markedly reduced TF activity after OMVs stimulation. CONCLUSION OMVs induce DIC through the caspase-11-GSDMD pathway. These findings might open a new avenue to prevent or treat bacterial infection-induced DIC.
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Affiliation(s)
- Yue Peng
- Department of Critical Care Medicine, The Third Xiangya Hospital, Central South University, Changsha, Hunan, PR China
| | - Min Gao
- Department of Critical Care Medicine, The Third Xiangya Hospital, Central South University, Changsha, Hunan, PR China
| | - Yukun Liu
- Department of Hematology, The Third Xiangya Hospital, Central South University, Changsha, Hunan, PR China
| | - Xianhui Qiu
- Department of Hematology, The Third Xiangya Hospital, Central South University, Changsha, Hunan, PR China
| | - Xiaoye Cheng
- Department of Hematology, The Third Xiangya Hospital, Central South University, Changsha, Hunan, PR China
| | - Xinyu Yang
- Department of Hematology, The Third Xiangya Hospital, Central South University, Changsha, Hunan, PR China
| | - Fangping Chen
- Department of Hematology, The Third Xiangya Hospital, Central South University, Changsha, Hunan, PR China
| | - Erhua Wang
- Department of Hematology, The Third Xiangya Hospital, Central South University, Changsha, Hunan, PR China.
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Wang E, Liu Y, Qiu X, Tang Y, Wang H, Xiao X, Chen F, Lu B. Bacteria-released outer membrane vesicles promote disseminated intravascular coagulation. Thromb Res 2019; 178:26-33. [PMID: 30953960 DOI: 10.1016/j.thromres.2019.03.019] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2018] [Revised: 03/14/2019] [Accepted: 03/27/2019] [Indexed: 02/05/2023]
Abstract
INTRODUCTION Sepsis is frequently complicated by disseminated intravascular coagulation (DIC), which promotes multiple organ dysfunctions and significantly increase the mortality of patients with sepsis. How bacteria cause DIC is not fully understood. Outer membrane vesicles (OMVs) are membrane-enclosed microvesicles released by variety of bacteria. The aim of this study is to determine whether OMVs contribute to the pathogenesis of DIC during bacterial infection. METHODS Wild-type (WT) or Toll-like receptor 4 (TLR4) knock-out mice were intraperitoneally injected with purified Escherichia coli (E.coli) derived OMVs, or with either wild type E.coli or E.coli with genetic deletion of ypjA, which is critical for OMV's production. Blood samples, liver and lung tissues were collected. The development of DIC was assessed in terms of the occurrence of coagulopathy, the thrombi deposition in livers and lungs, the multiple organ injuries, and the lethality. RESULTS Genetic deletion of ypjA significantly attenuated E.coli-induced coagulopathy, intravascular thrombi deposition, multiple organ injuries and mortality, whereas injection of purified E.coli-derived OMVs resulted in the development of DIC in a TLR4-dependent manner. CONCLUSIONS OMVs importantly contribute to the pathogenesis of DIC during Gram-negative bacterial infection. These findings might open a new avenue to prevent infection-associated coagulopathy by targeting OMVs production.
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Affiliation(s)
- Erhua Wang
- Department of Hematology, The 3rd Xiangya Hospital, Central South University, Changsha, PR China; Key Laboratory of Non-resolving Inflammation and Cancer of Hunan Province, The 3rd Xiangya Hospital, Central South University, Changsha, PR China
| | - Yukun Liu
- Department of Hematology, The 3rd Xiangya Hospital, Central South University, Changsha, PR China; Key Laboratory of Non-resolving Inflammation and Cancer of Hunan Province, The 3rd Xiangya Hospital, Central South University, Changsha, PR China
| | - Xianhui Qiu
- Department of Hematology, The 3rd Xiangya Hospital, Central South University, Changsha, PR China; Key Laboratory of Non-resolving Inflammation and Cancer of Hunan Province, The 3rd Xiangya Hospital, Central South University, Changsha, PR China
| | - Yiting Tang
- Department of Physiology, School of Basic Medical Science, Central South University, Changsha, Hunan Province, PR China; State Key Laboratory of Medical Genetics, School of Biological Science and Technology, Central South University, Changsha, Hunan Province, PR China
| | - Huadong Wang
- Department of Pathophysiology, School of Basic Medical Science, Jinan University, Guangzhou, Guangdong Province, PR China
| | - Xianzhong Xiao
- Department of Pathophysiology, School of Basic Medical Science, Central South University, Changsha, Hunan Province, PR China
| | - Fangping Chen
- Department of Hematology, The 3rd Xiangya Hospital, Central South University, Changsha, PR China; Key Laboratory of Non-resolving Inflammation and Cancer of Hunan Province, The 3rd Xiangya Hospital, Central South University, Changsha, PR China
| | - Ben Lu
- Department of Hematology, The 3rd Xiangya Hospital, Central South University, Changsha, PR China; State Key Laboratory of Medical Genetics, School of Biological Science and Technology, Central South University, Changsha, Hunan Province, PR China; Department of Pathophysiology, School of Basic Medical Science, Jinan University, Guangzhou, Guangdong Province, PR China; Key Laboratory of Non-resolving Inflammation and Cancer of Hunan Province, The 3rd Xiangya Hospital, Central South University, Changsha, PR China.
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Elhosseiny NM, Elhezawy NB, Attia AS. Comparative proteomics analyses of Acinetobacter baumannii strains ATCC 17978 and AB5075 reveal the differential role of type II secretion system secretomes in lung colonization and ciprofloxacin resistance. Microb Pathog 2019; 128:20-27. [DOI: 10.1016/j.micpath.2018.12.039] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2018] [Revised: 11/16/2018] [Accepted: 12/19/2018] [Indexed: 12/20/2022]
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