A previously uncharacterized two-component signaling system in uropathogenic Escherichia coli coordinates protection against host-derived oxidative stress with activation of hemolysin-mediated host cell pyroptosis

Uropathogenic Escherichia coli (UPEC) deploy an array of virulence factors to successfully establish urinary tract infections. Hemolysin is a pore-forming toxin, and its expression correlates with the severity of UPEC infection. Two-component signaling systems (TCSs) are a major mechanism by which b...

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Veröffentlicht in:PLoS pathogens 2021-10, Vol.17 (10), p.e1010005-e1010005
Hauptverfasser: Gu, Hongwei, Cai, Xuwang, Zhang, Xinyang, Luo, Jie, Zhang, Xiaoyang, Hu, Xiao, Cai, Wentong, Li, Ganwu
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container_issue 10
container_start_page e1010005
container_title PLoS pathogens
container_volume 17
creator Gu, Hongwei
Cai, Xuwang
Zhang, Xinyang
Luo, Jie
Zhang, Xiaoyang
Hu, Xiao
Cai, Wentong
Li, Ganwu
description Uropathogenic Escherichia coli (UPEC) deploy an array of virulence factors to successfully establish urinary tract infections. Hemolysin is a pore-forming toxin, and its expression correlates with the severity of UPEC infection. Two-component signaling systems (TCSs) are a major mechanism by which bacteria sense environmental cues and respond by initiating adaptive responses. Here, we began this study by characterizing a novel TCS (C3564/C3565, herein renamed orhK / orhR for o xidative r esistance and h emolysis k inase/ r egulator) that is encoded on a UPEC pathogenicity island, using bioinformatic and biochemical approaches. A prevalence analysis indicates that orhK / orhR is highly associated with the UPEC pathotype, and it rarely occurs in other E . coli pathotypes tested. We then demonstrated that OrhK/OrhR directly activates the expression of a putative methionine sulfoxide reductase system (C3566/C3567) and hemolysin (HlyA) in response to host-derived hydrogen peroxide (H 2 O 2 ) exposure. OrhK/OrhR increases UPEC resistance to H 2 O 2 in vitro and survival in macrophages in cell culture via C3566/C3567. Additionally, OrhK/OrhR mediates hemolysin-induced renal epithelial cell and macrophage death via a pyroptosis pathway. Reducing intracellular H 2 O 2 production by a chemical inhibitor impaired OrhK/OrhR-mediated activation of c3566-c3567 and hlyA . We also uncovered that UPEC links the two key virulence traits by cotranscribing the c3566-c3567 and hlyCABD operons. Taken together, our data suggest a paradigm in which a signal transduction system coordinates both bacterial pathogen defensive and offensive traits in the presence of host-derived signals; and this exquisite mechanism likely contributes to hemolysin-induced severe pathological outcomes.
doi_str_mv 10.1371/journal.ppat.1010005
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Hemolysin is a pore-forming toxin, and its expression correlates with the severity of UPEC infection. Two-component signaling systems (TCSs) are a major mechanism by which bacteria sense environmental cues and respond by initiating adaptive responses. Here, we began this study by characterizing a novel TCS (C3564/C3565, herein renamed orhK / orhR for o xidative r esistance and h emolysis k inase/ r egulator) that is encoded on a UPEC pathogenicity island, using bioinformatic and biochemical approaches. A prevalence analysis indicates that orhK / orhR is highly associated with the UPEC pathotype, and it rarely occurs in other E . coli pathotypes tested. We then demonstrated that OrhK/OrhR directly activates the expression of a putative methionine sulfoxide reductase system (C3566/C3567) and hemolysin (HlyA) in response to host-derived hydrogen peroxide (H 2 O 2 ) exposure. OrhK/OrhR increases UPEC resistance to H 2 O 2 in vitro and survival in macrophages in cell culture via C3566/C3567. Additionally, OrhK/OrhR mediates hemolysin-induced renal epithelial cell and macrophage death via a pyroptosis pathway. Reducing intracellular H 2 O 2 production by a chemical inhibitor impaired OrhK/OrhR-mediated activation of c3566-c3567 and hlyA . We also uncovered that UPEC links the two key virulence traits by cotranscribing the c3566-c3567 and hlyCABD operons. Taken together, our data suggest a paradigm in which a signal transduction system coordinates both bacterial pathogen defensive and offensive traits in the presence of host-derived signals; and this exquisite mechanism likely contributes to hemolysin-induced severe pathological outcomes.</description><identifier>ISSN: 1553-7374</identifier><identifier>ISSN: 1553-7366</identifier><identifier>EISSN: 1553-7374</identifier><identifier>DOI: 10.1371/journal.ppat.1010005</identifier><identifier>PMID: 34653218</identifier><language>eng</language><publisher>San Francisco: Public Library of Science</publisher><subject>Apoptosis ; Bacteria ; Biology and Life Sciences ; Causes of ; Cell activation ; Cell culture ; Cell death ; Cell survival ; Cellular signal transduction ; Development and progression ; E coli ; Epithelial cells ; Epithelium ; Escherichia coli ; Gene expression ; Genetic aspects ; Hemolysis and hemolysins ; Host-bacteria relationships ; Hydrogen peroxide ; Infections ; Kinases ; Macrophages ; Medicine and Health Sciences ; Methionine ; Mutation ; Neutrophils ; Operons ; Oxidation resistance ; Oxidative stress ; Pathogenicity ; Pathogens ; Phosphorylation ; Physiological aspects ; Pore formation ; Proteins ; Pyroptosis ; Reductases ; Signal transduction ; Signalling systems ; Toxins ; Urinary tract ; Urinary tract infections ; Virulence ; Virulence factors</subject><ispartof>PLoS pathogens, 2021-10, Vol.17 (10), p.e1010005-e1010005</ispartof><rights>COPYRIGHT 2021 Public Library of Science</rights><rights>2021 Gu et al. 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OrhK/OrhR increases UPEC resistance to H 2 O 2 in vitro and survival in macrophages in cell culture via C3566/C3567. Additionally, OrhK/OrhR mediates hemolysin-induced renal epithelial cell and macrophage death via a pyroptosis pathway. Reducing intracellular H 2 O 2 production by a chemical inhibitor impaired OrhK/OrhR-mediated activation of c3566-c3567 and hlyA . We also uncovered that UPEC links the two key virulence traits by cotranscribing the c3566-c3567 and hlyCABD operons. 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Hemolysin is a pore-forming toxin, and its expression correlates with the severity of UPEC infection. Two-component signaling systems (TCSs) are a major mechanism by which bacteria sense environmental cues and respond by initiating adaptive responses. Here, we began this study by characterizing a novel TCS (C3564/C3565, herein renamed orhK / orhR for o xidative r esistance and h emolysis k inase/ r egulator) that is encoded on a UPEC pathogenicity island, using bioinformatic and biochemical approaches. A prevalence analysis indicates that orhK / orhR is highly associated with the UPEC pathotype, and it rarely occurs in other E . coli pathotypes tested. We then demonstrated that OrhK/OrhR directly activates the expression of a putative methionine sulfoxide reductase system (C3566/C3567) and hemolysin (HlyA) in response to host-derived hydrogen peroxide (H 2 O 2 ) exposure. OrhK/OrhR increases UPEC resistance to H 2 O 2 in vitro and survival in macrophages in cell culture via C3566/C3567. Additionally, OrhK/OrhR mediates hemolysin-induced renal epithelial cell and macrophage death via a pyroptosis pathway. Reducing intracellular H 2 O 2 production by a chemical inhibitor impaired OrhK/OrhR-mediated activation of c3566-c3567 and hlyA . We also uncovered that UPEC links the two key virulence traits by cotranscribing the c3566-c3567 and hlyCABD operons. Taken together, our data suggest a paradigm in which a signal transduction system coordinates both bacterial pathogen defensive and offensive traits in the presence of host-derived signals; and this exquisite mechanism likely contributes to hemolysin-induced severe pathological outcomes.</abstract><cop>San Francisco</cop><pub>Public Library of Science</pub><pmid>34653218</pmid><doi>10.1371/journal.ppat.1010005</doi><orcidid>https://orcid.org/0000-0002-2282-302X</orcidid><oa>free_for_read</oa></addata></record>
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subjects Apoptosis
Bacteria
Biology and Life Sciences
Causes of
Cell activation
Cell culture
Cell death
Cell survival
Cellular signal transduction
Development and progression
E coli
Epithelial cells
Epithelium
Escherichia coli
Gene expression
Genetic aspects
Hemolysis and hemolysins
Host-bacteria relationships
Hydrogen peroxide
Infections
Kinases
Macrophages
Medicine and Health Sciences
Methionine
Mutation
Neutrophils
Operons
Oxidation resistance
Oxidative stress
Pathogenicity
Pathogens
Phosphorylation
Physiological aspects
Pore formation
Proteins
Pyroptosis
Reductases
Signal transduction
Signalling systems
Toxins
Urinary tract
Urinary tract infections
Virulence
Virulence factors
title A previously uncharacterized two-component signaling system in uropathogenic Escherichia coli coordinates protection against host-derived oxidative stress with activation of hemolysin-mediated host cell pyroptosis
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