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Menezes-Garcia Z, Do Nascimento Arifa RD, Acúrcio L, Brito CB, Gouvea JO, Lima RL, Bastos RW, Fialho Dias AC, Antunes Dourado LP, Bastos LFS, Queiroz-Júnior CM, Igídio CED, Bezerra RDO, Vieira LQ, Nicoli JR, Teixeira MM, Fagundes CT, Souza DG. Colonization by Enterobacteriaceae is crucial for acute inflammatory responses in murine small intestine via regulation of corticosterone production. Gut Microbes 2020; 11:1531-1546. [PMID: 32573321 PMCID: PMC7524327 DOI: 10.1080/19490976.2020.1765946] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
Although dysbiosis in the gut microbiota is known to be involved in several inflammatory diseases, whether any specific bacterial taxa control host response to inflammatory stimuli is still elusive. Here, we hypothesized that dysbiotic indigenous taxa could be involved in modulating host response to inflammatory triggers. To test this hypothesis, we conducted experiments in germ-free (GF) mice and in mice colonized with dysbiotic taxa identified in conventional (CV) mice subjected to chemotherapy-induced mucositis. First, we report that the absence of microbiota decreased inflammation and damage in the small intestine after administration of the chemotherapeutic agent 5-fluorouracil (5-FU). Also, 5-FU induced a shift in CV microbiota resulting in higher amounts of Enterobacteriaceae, including E. coli, in feces and small intestine and tissue damage. Prevention of Enterobacteriaceae outgrowth by treating mice with ciprofloxacin resulted in diminished 5-FU-induced tissue damage, indicating that this bacterial group is necessary for 5-FU-induced inflammatory response. In addition, monocolonization of germ-free (GF) mice with E. coli led to reversal of the protective phenotype during 5-FU chemotherapy. E. coli monocolonization decreased the basal plasma corticosterone levels and blockade of glucocorticoid receptor in GF mice restored inflammation upon 5-FU treatment. In contrast, treatment of CV mice with ciprofloxacin, that presented reduction of Enterobacteriaceae and E. coli content, induced an increase in corticosterone levels. Altogether, these findings demonstrate that Enterobacteriaceae outgrowth during dysbiosis impacts inflammation and tissue injury in the small intestine. Importantly, indigenous Enterobacteriaceae modulates host production of the anti-inflammatory steroid corticosterone and, consequently, controls inflammatory responsiveness in mice.
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Affiliation(s)
- Zélia Menezes-Garcia
- Departament of Microbiology, Universidade Federal De Minas Gerais, Minas Gerais, Brazil
| | | | - Leonardo Acúrcio
- Departament of Microbiology, Universidade Federal De Minas Gerais, Minas Gerais, Brazil
| | - Camila Bernardo Brito
- Departament of Microbiology, Universidade Federal De Minas Gerais, Minas Gerais, Brazil
| | - Júlia Oliveira Gouvea
- Departament of Microbiology, Universidade Federal De Minas Gerais, Minas Gerais, Brazil
| | - Renata Lacerda Lima
- Departament of Microbiology, Universidade Federal De Minas Gerais, Minas Gerais, Brazil
| | - Rafael Wesley Bastos
- Departament of Microbiology, Universidade Federal De Minas Gerais, Minas Gerais, Brazil
| | - Ana Carolina Fialho Dias
- Departament of Microbiology, Universidade Federal De Minas Gerais, Minas Gerais, Brazil,Departament of Biochemistry and Immunology, Universidade Federal de Minas Gerais, Minas Gerais, Brazil
| | | | - Leandro F. S. Bastos
- Departament of Biochemistry and Immunology, Universidade Federal de Minas Gerais, Minas Gerais, Brazil
| | | | | | | | - Leda Q. Vieira
- Departament of Biochemistry and Immunology, Universidade Federal de Minas Gerais, Minas Gerais, Brazil
| | - Jacques R. Nicoli
- Departament of Microbiology, Universidade Federal De Minas Gerais, Minas Gerais, Brazil
| | - Mauro Martins Teixeira
- Departament of Biochemistry and Immunology, Universidade Federal de Minas Gerais, Minas Gerais, Brazil
| | - Caio T. Fagundes
- Departament of Microbiology, Universidade Federal De Minas Gerais, Minas Gerais, Brazil,Caio T. Fagundes Departamento De Microbiologia, Instituto De Ciências Biológicas, Universidade Federal De Minas Gerais, Minas Gerais6627, Brazil
| | - Daniele G. Souza
- Departament of Microbiology, Universidade Federal De Minas Gerais, Minas Gerais, Brazil,CONTACT Daniele G. Souza
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Moraes CTP, Longo J, Silva LB, Pimenta DC, Carvalho E, Morone MSLC, da Rós N, Serrano SMT, Santos ACM, Piazza RMF, Barbosa AS, Elias WP. Surface Protein Dispersin of Enteroaggregative Escherichia coli Binds Plasminogen That Is Converted Into Active Plasmin. Front Microbiol 2020; 11:1222. [PMID: 32625178 PMCID: PMC7315649 DOI: 10.3389/fmicb.2020.01222] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2019] [Accepted: 05/14/2020] [Indexed: 01/24/2023] Open
Abstract
Dispersin is a 10.2 kDa-immunogenic protein secreted by enteroaggregative Escherichia coli (EAEC). In the prototypical EAEC strain 042, dispersin is non-covalently bound to the outer membrane, assisting dispersion across the intestinal mucosa by overcoming electrostatic attraction between the AAF/II fimbriae and the bacterial surface. Also, dispersin facilitates penetration of the intestinal mucus layer. Initially characterized in EAEC, dispersin has been detected in other E. coli pathotypes, including those isolated from extraintestinal sites. In this study we investigated the binding capacity of purified dispersin to extracellular matrix (ECM), since dispersin is exposed on the bacterial surface and is involved in intestinal colonization. Binding to plasminogen was also investigated due to the presence of conserved carboxy-terminal lysine residues in dispersin sequences, which are involved in plasminogen binding in several bacterial proteins. Moreover, some E. coli components can interact with this host protease, as well as with tissue plasminogen activator, leading to plasmin production. Recombinant dispersin was produced and used in binding assays with ECM molecules and coagulation cascade compounds. Purified dispersin bound specifically to laminin and plasminogen. Interaction with plasminogen occurred in a dose-dependent and saturable manner. In the presence of plasminogen activator, bound plasminogen was converted into plasmin, its active form, leading to fibrinogen and vitronectin cleavage. A collection of E. coli strains isolated from human bacteremia was screened for the presence of aap, the dispersin-encoding gene. Eight aap-positive strains were detected and dispersin production could be observed in four of them. Our data describe new attributes for dispersin and points out to possible roles in mechanisms of tissue adhesion and dissemination, considering the binding capacity to laminin, and the generation of dispersin-bound plasmin(ogen), which may facilitate E. coli spread from the colonization site to other tissues and organs. The cleavage of fibrinogen in the bloodstream, may also contribute to the pathogenesis of sepsis caused by dispersin-producing E. coli.
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Affiliation(s)
| | - Jonathan Longo
- Laboratory of Bacteriology, Butantan Institute, São Paulo, Brazil
| | - Ludmila B Silva
- Laboratory of Bacteriology, Butantan Institute, São Paulo, Brazil
| | - Daniel C Pimenta
- Laboratory of Biochemistry and Biophysics, Butantan Institute, São Paulo, Brazil
| | - Eneas Carvalho
- Laboratory of Bacteriology, Butantan Institute, São Paulo, Brazil
| | - Mariana S L C Morone
- Laboratory of Applied Toxinology - Center of Toxins, Immune-Response and Cell Signaling (CeTICS), Butantan Institute, São Paulo, Brazil
| | - Nancy da Rós
- Laboratory of Applied Toxinology - Center of Toxins, Immune-Response and Cell Signaling (CeTICS), Butantan Institute, São Paulo, Brazil
| | - Solange M T Serrano
- Laboratory of Applied Toxinology - Center of Toxins, Immune-Response and Cell Signaling (CeTICS), Butantan Institute, São Paulo, Brazil
| | - Ana Carolina M Santos
- Department of Microbiology, Immunology and Parasitology, Federal University of São Paulo, São Paulo, Brazil
| | | | - Angela S Barbosa
- Laboratory of Bacteriology, Butantan Institute, São Paulo, Brazil
| | - Waldir P Elias
- Laboratory of Bacteriology, Butantan Institute, São Paulo, Brazil
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Chao AW, Bhatti M, DuPont HL, Nataro JP, Carlin LG, Okhuysen PC. Clinical features and molecular epidemiology of diarrheagenic Escherichia coli pathotypes identified by fecal gastrointestinal multiplex nucleic acid amplification in patients with cancer and diarrhea. Diagn Microbiol Infect Dis 2017; 89:235-240. [PMID: 28931467 DOI: 10.1016/j.diagmicrobio.2017.08.004] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2017] [Accepted: 08/06/2017] [Indexed: 01/29/2023]
Abstract
Diarrheagenic Escherichia coli (DEC) pathotypes with differing epidemiology and clinical features, are known causes of disease with worldwide occurrence. At a major cancer center in the U.S., we studied patients with cancer and diarrhea for whom a GI Biofire FilmArray multiplex GI panel (BFM) was performed. An enteropathogen was identified in 382 of 2017 (19%) samples distributed across 311 patients. Of these, 60/311(19%) were positive for DEC. Patients receiving hematopoietic stem cell transplants (HSCT) 29/60 (48%) or with a hematologic malignancy 17/60 (28%) accounted for the majority of DEC cases. Enteropathogenic E. coli (EPEC, n=35 [58%]), enteroaggregative E. coli (EAEC, n=10 [17%]) and Shiga toxin producing E. coli (STEC, n=3 [5%]) were the most common DEC identified and peaked in the summer months. Stool cultures confirmed infections in 6/10 (60%) EAEC (five typical AggR+), and EPEC was recovered in 8/35 (22%) samples (all atypical eaeA+, bfp-). DEC was identified in 22 cases (37%) that developed diarrhea >48hours after admission suggesting health care acquisition. Chronic infections were found in 2 EPEC and 1 EAEC cases that were tested at 1month or beyond with shedding that ranged from 58 to >125days. Two patients that underwent hematopoietic stem cell transplantation carried EAEC strains resistant to multiple antibiotics including fluoroquinolones and expressed extended spectrum beta lactamases. While in some instances BFM results were not verified in culture and could represent false positives, DEC pathotypes, especially EPEC and EAEC, caused chronic infections with antimicrobial-resistant strains in a subset of immunosuppressed cancer patients.
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Affiliation(s)
- Andrew W Chao
- Department of Infectious Diseases, Infection Control and Employee Health, The University of Texas M.D. Anderson Cancer Center, Houston, TX; Section of Infectious Diseases, Baylor College of Medicine, Houston, TX
| | - Micah Bhatti
- Department of Laboratory Medicine, The University of Texas M.D. Anderson Cancer Center, Houston, TX
| | - Herbert L DuPont
- Section of Infectious Diseases, Baylor College of Medicine, Houston, TX; Department of Epidemiology, Human Genetics and Environmental Health, The University of Texas School of Public Health, Houston, TX
| | - James P Nataro
- Department of Pediatrics, The University of Virginia School of medicine, Charlottesville, VA
| | - Lily G Carlin
- Department of Infectious Diseases, Infection Control and Employee Health, The University of Texas M.D. Anderson Cancer Center, Houston, TX
| | - Pablo C Okhuysen
- Department of Infectious Diseases, Infection Control and Employee Health, The University of Texas M.D. Anderson Cancer Center, Houston, TX; Section of Infectious Diseases, Baylor College of Medicine, Houston, TX; Department of Epidemiology, Human Genetics and Environmental Health, The University of Texas School of Public Health, Houston, TX.
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