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Basso P, Wallet P, Elsen S, Soleilhac E, Henry T, Faudry E, Attrée I. Multiple Pseudomonas species secrete exolysin-like toxins and provoke Caspase-1-dependent macrophage death. Environ Microbiol 2017; 19:4045-4064. [PMID: 28654176 DOI: 10.1111/1462-2920.13841] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2017] [Revised: 06/02/2017] [Accepted: 06/19/2017] [Indexed: 12/19/2022]
Abstract
Pathogenic bacteria secrete protein toxins that provoke apoptosis or necrosis of eukaryotic cells. Here, we developed a live-imaging method, based on incorporation of a DNA-intercalating dye into membrane-damaged host cells, to study the kinetics of primary bone marrow-derived macrophages (BMDMs) mortality induced by opportunistic pathogen Pseudomonas aeruginosa expressing either Type III Secretion System (T3SS) toxins or the pore-forming toxin, Exolysin (ExlA). We found that ExlA promotes the activation of Caspase-1 and maturation of interleukin-1β. BMDMs deficient for Caspase-1 and Caspase-11 were resistant to ExlA-induced death. Furthermore, by using KO BMDMs, we determined that the upstream NLRP3/ASC complex leads to the Caspase-1 activation. We also demonstrated that Pseudomonas putida and Pseudomonas protegens and the Drosophila pathogen Pseudomonas entomophila, which naturally express ExlA-like toxins, are cytotoxic toward macrophages and provoke the same type of pro-inflammatory death as does ExlA+ P. aeruginosa. These results demonstrate that ExlA-like toxins of two-partner secretion systems from diverse Pseudomonas species activate the NLRP3 inflammasome and provoke inflammatory pyroptotic death of macrophages.
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Affiliation(s)
- Pauline Basso
- CNRS-ERL5261, INSERM, U1036, CEA, Bacterial Pathogenesis and Cellular Responses, Biosciences and Biotechnology Institute of Grenoble, University Grenoble Alpes, France
| | - Pierre Wallet
- CIRI, Centre International de Recherche en Infectiologie, INSERM, U1111, Université Claude Bernard Lyon 1, CNRS, UMR5308, École Normale Supérieure de Lyon, Univ Lyon, Lyon, F-69007, France
| | - Sylvie Elsen
- CNRS-ERL5261, INSERM, U1036, CEA, Bacterial Pathogenesis and Cellular Responses, Biosciences and Biotechnology Institute of Grenoble, University Grenoble Alpes, France
| | - Emmanuelle Soleilhac
- CMBA Platform, Biosciences and Biotechnology Institute of Grenoble, University Grenoble Alpes, CEA, INSERM; Genetics & Chemogenomics, France
| | - Thomas Henry
- CIRI, Centre International de Recherche en Infectiologie, INSERM, U1111, Université Claude Bernard Lyon 1, CNRS, UMR5308, École Normale Supérieure de Lyon, Univ Lyon, Lyon, F-69007, France
| | - Eric Faudry
- CNRS-ERL5261, INSERM, U1036, CEA, Bacterial Pathogenesis and Cellular Responses, Biosciences and Biotechnology Institute of Grenoble, University Grenoble Alpes, France
| | - Ina Attrée
- CNRS-ERL5261, INSERM, U1036, CEA, Bacterial Pathogenesis and Cellular Responses, Biosciences and Biotechnology Institute of Grenoble, University Grenoble Alpes, France
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Magalhães MJTL, Pontes G, Serra PT, Balieiro A, Castro D, Pieri FA, Crainey JL, Nogueira PA, Orlandi PP. Multidrug resistant Pseudomonas aeruginosa survey in a stream receiving effluents from ineffective wastewater hospital plants. BMC Microbiol 2016; 16:193. [PMID: 27558582 PMCID: PMC4995675 DOI: 10.1186/s12866-016-0798-0] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2015] [Accepted: 08/03/2016] [Indexed: 01/08/2023] Open
Abstract
BACKGROUND Multi-drug resistant forms of Pseudomonas aeruginosa (MDRPA) are a major source of nosocomial infections and when discharged into streams and rivers from hospital wastewater treatment plants (HWWTP) they are known to be able to persist for extended periods. In the city of Manaus (Western Brazilian Amazon), the effluent of three HWWTPs feed into the urban Mindu stream which crosses the city from its rainforest source before draining into the Rio Negro. The stream is routinely used by Manaus residents for bathing and cleaning (of clothes as well as domestic utensils) and, during periods of flooding, can contaminate wells used for drinking water. RESULTS 16S rRNA metagenomic sequence analysis of 293 cloned PCR fragments, detected an abundance of Pseudomonas aeruginosa (P. aeruginosa) at the stream's Rio Negro drainage site, but failed to detect it at the stream's source. An array of antimicrobial resistance profiles and resistance to all 14 tested antimicrobials was detected among P. aeruginosa cultures prepared from wastewater samples taken from water entering and being discharged from a Manaus HWWTP. Just one P. aeruginosa antimicrobial resistance profile, however, was detected from cultures made from Mindu stream isolates. Comparisons made between P. aeruginosa isolates' genomic DNA restriction enzyme digest fingerprints, failed to determine if any of the P. aeruginosa found in the Mindu stream were of HWWTP origin, but suggested that Mindu stream P. aeruginosa are from diverse origins. Culturing experiments also showed that P. aeruginosa biofilm formation and the extent of biofilm formation produced were both significantly higher in multi drug resistant forms of P. aeruginosa. CONCLUSIONS Our results show that a diverse range of MDRPA are being discharged in an urban stream from a HWWTP in Manaus and that P. aeruginosa strains with ampicillin and amikacin can persist well within it.
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Affiliation(s)
| | - Gemilson Pontes
- Instituto Nacional de Pesquisa da Amazônia - INPA, 2936 André Araújo Av, 69060-001, Manaus, AM, Brazil
| | - Paula Takita Serra
- Instituto de Pesquisa Leônidas e Maria Deane - FIOCRUZ AMAZONIA, 476 Teresina St, Adrianópolis, 69057-070, Manaus, AM, Brazil
| | - Antonio Balieiro
- Instituto de Pesquisa Leônidas e Maria Deane - FIOCRUZ AMAZONIA, 476 Teresina St, Adrianópolis, 69057-070, Manaus, AM, Brazil
| | - Diogo Castro
- Instituto de Pesquisa Leônidas e Maria Deane - FIOCRUZ AMAZONIA, 476 Teresina St, Adrianópolis, 69057-070, Manaus, AM, Brazil
| | - Fabio Alessandro Pieri
- Departamento Básico - Área de Saúde; Campus Governador Valadares, Universidade Federal de Juiz de Fora, Rua Israel Pinheiro, 2000, Bairro Universitário, Governador Valadares, MG, Brazil
| | - James Lee Crainey
- Instituto de Pesquisa Leônidas e Maria Deane - FIOCRUZ AMAZONIA, 476 Teresina St, Adrianópolis, 69057-070, Manaus, AM, Brazil
| | - Paulo Afonso Nogueira
- Programa de Pós-Graduação Sociedade e Endemias na Amazônia, ILMD, 476, Teresina St, Adrianópolis, 69057-070, Manaus, AM, Brazil.,Instituto de Pesquisa Leônidas e Maria Deane - FIOCRUZ AMAZONIA, 476 Teresina St, Adrianópolis, 69057-070, Manaus, AM, Brazil
| | - Patricia Puccinelli Orlandi
- Programa de Pós-Graduação Sociedade e Endemias na Amazônia, ILMD, 476, Teresina St, Adrianópolis, 69057-070, Manaus, AM, Brazil. .,Instituto de Pesquisa Leônidas e Maria Deane - FIOCRUZ AMAZONIA, 476 Teresina St, Adrianópolis, 69057-070, Manaus, AM, Brazil.
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Martiny JBH, Jones SE, Lennon JT, Martiny AC. Microbiomes in light of traits: A phylogenetic perspective. Science 2015; 350:aac9323. [PMID: 26542581 DOI: 10.1126/science.aac9323] [Citation(s) in RCA: 399] [Impact Index Per Article: 44.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
A focus on the phenotypic characteristics of microorganisms-their traits-offers a path for interpreting the growing amount of microbiome data. We review key aspects of microbial traits, as well as approaches used to assay their phylogenetic distribution. Recent studies reveal that microbial traits are differentially conserved across the tree of life and appear to be conserved in a hierarchical fashion, possibly linked to their biochemical complexity. These results suggest a predictive framework whereby the genetic (or taxonomic) resolution of microbiome variation among samples provides information about the traits under selection. The organizational parallels seen among human and free-living microbiomes seem to support this idea. Developments in this framework may offer predictions not only for how microbial composition responds to changing environmental conditions, but also for how these changes may alter the health or functioning in human, engineered, and environmental systems.
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Affiliation(s)
- Jennifer B H Martiny
- Department of Ecology and Evolutionary Biology, University of California, Irvine, CA, USA.
| | - Stuart E Jones
- Department of Biological Sciences, University of Notre Dame, Notre Dame, IN, USA
| | - Jay T Lennon
- Department of Biology, Indiana University, Bloomington, IN, USA
| | - Adam C Martiny
- Department of Ecology and Evolutionary Biology, University of California, Irvine, CA, USA. Department of Earth System Science, University of California, Irvine, CA, USA
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