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Silva LOS, Baeza LC, Pigosso LL, Silva KSFE, Pereira M, de Carvalho Júnior MAB, de Almeida Soares CM. The Response of Paracoccidioides lutzii to the Interaction with Human Neutrophils. J Fungi (Basel) 2023; 9:1088. [PMID: 37998893 PMCID: PMC10672145 DOI: 10.3390/jof9111088] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2023] [Revised: 10/14/2023] [Accepted: 10/24/2023] [Indexed: 11/25/2023] Open
Abstract
The fungal pathogen Paracoccidioides lutzii causes systemic mycosis Paracoccidioidomycosis (PCM), which presents a broad distribution in Latin America. Upon infection, the fungus undergoes a morphological transition to yeast cells and provokes an inflammatory granulomatous reaction with a high number of neutrophils in the lungs. In this work, we employed proteomic analysis to investigate the in vitro response of the fungus to the interaction with human neutrophils. Proteomic profiling of P. lutzii yeast cells harvested at 2 and 4 h post interaction with human polymorphonuclear cells allowed the identification of 505 proteins differentially accumulated. The data indicated that P. lutzii yeast cells underwent a shift in metabolism from glycolysis to Beta oxidation, increasing enzymes of the glyoxylate cycle and upregulating enzymes related to the detoxification of oxidative and heat shock stress. To our knowledge, this is the first study employing proteomic analysis in the investigation of the response of a member of the Paracoccidioides genus to the interaction with neutrophils.
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Affiliation(s)
- Lana O’Hara Souza Silva
- Laboratório de Biologia Molecular, Instituto de Ciências Biológicas, Universidade Federal de Goiás, Goiania 74690-900, GO, Brazil; (L.O.S.S.); (L.L.P.); (K.S.F.e.S.); (M.P.); (M.A.B.d.C.J.)
| | - Lilian Cristiane Baeza
- Laboratório de Bacteriologia e Micologia Médica, Centro de Ciências Médicas e Farmacêuticas, Universidade Estadual do Oeste do Paraná, Cascavel 85819-110, PR, Brazil;
| | - Laurine Lacerda Pigosso
- Laboratório de Biologia Molecular, Instituto de Ciências Biológicas, Universidade Federal de Goiás, Goiania 74690-900, GO, Brazil; (L.O.S.S.); (L.L.P.); (K.S.F.e.S.); (M.P.); (M.A.B.d.C.J.)
| | - Kleber Santiago Freitas e Silva
- Laboratório de Biologia Molecular, Instituto de Ciências Biológicas, Universidade Federal de Goiás, Goiania 74690-900, GO, Brazil; (L.O.S.S.); (L.L.P.); (K.S.F.e.S.); (M.P.); (M.A.B.d.C.J.)
| | - Maristela Pereira
- Laboratório de Biologia Molecular, Instituto de Ciências Biológicas, Universidade Federal de Goiás, Goiania 74690-900, GO, Brazil; (L.O.S.S.); (L.L.P.); (K.S.F.e.S.); (M.P.); (M.A.B.d.C.J.)
| | - Marcos Antonio Batista de Carvalho Júnior
- Laboratório de Biologia Molecular, Instituto de Ciências Biológicas, Universidade Federal de Goiás, Goiania 74690-900, GO, Brazil; (L.O.S.S.); (L.L.P.); (K.S.F.e.S.); (M.P.); (M.A.B.d.C.J.)
| | - Célia Maria de Almeida Soares
- Laboratório de Biologia Molecular, Instituto de Ciências Biológicas, Universidade Federal de Goiás, Goiania 74690-900, GO, Brazil; (L.O.S.S.); (L.L.P.); (K.S.F.e.S.); (M.P.); (M.A.B.d.C.J.)
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2
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Zonta YR, Dezen ALO, Della Coletta AM, Yu KST, Carvalho L, Dos Santos LA, Deprá IDC, Kratofil RM, Willson ME, Zbytnuik L, Kubes P, Ximenes VF, Dias-Melicio LA. Paracoccidioides brasiliensis Releases a DNase-Like Protein That Degrades NETs and Allows for Fungal Escape. Front Cell Infect Microbiol 2021; 10:592022. [PMID: 33643928 PMCID: PMC7902888 DOI: 10.3389/fcimb.2020.592022] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Accepted: 12/28/2020] [Indexed: 12/22/2022] Open
Abstract
Paracoccidioidomycosis is a systemic fungal disease, considered endemic in Latin America. Its etiological agents, fungi of the Paracoccidioides complex, have restricted geographic habitat, conidia as infecting form, and thermo-dimorphic characteristics. Polymorphonuclear neutrophils (PMNs) are responsible for an important defense response against fungus, releasing Neutrophil Extracellular Traps (NETs), which can wrap and destroy the yeasts. However, it has been described that some pathogens are able to evade from these DNA structures by releasing DNase as an escape mechanism. As different NETs patterns have been identified in PMNs cultures challenged with different isolates of Paracoccidioides brasiliensis, the general objective of this study was to identify if different patterns of NETs released by human PMNs challenged with Pb18 (virulent) and Pb265 (avirulent) isolates would be correlated with fungal ability to produce a DNase-like protein. To this end, PMNs from healthy subjects were isolated and challenged in vitro with both fungal isolates. The production, release, and conformation of NETs in response to the fungi were evaluated by Confocal Microscopy, Scanning Microscopy, and NETs Quantification. The identification of fungal DNase production was assessed by DNase TEST Agar, and the relative gene expression for hypothetical proteins was investigated by RT-qPCR, whose genes had been identified in the fungal genome in the GenBank (PADG_11161 and PADG_08285). It was possible to verify the NETs release by PMNs, showing different NETs formation when in contact with different isolates of the fungus. The Pb18 isolate induced the release of looser, larger, and more looking like degraded NETs compared to the Pb265 isolate, which induced the release of denser and more compact NETs. DNase TEST Agar identified the production of a DNase-like protein, showing that only Pb18 showed the capacity to degrade DNA in these plates. Besides that, we were able to identify that both PADG_08528 and PADG_11161 genes were more expressed during interaction with neutrophil by the virulent isolate, being PADG_08528 highly expressed in these cultures, demonstrating that this gene could have a greater contribution to the production of the protein. Thus, we identified that the virulent isolate is inducing more scattered and loose NETs, probably by releasing a DNase-like protein. This factor could be an important escape mechanism used by the fungus to escape the NETs action.
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Affiliation(s)
- Yohan Ricci Zonta
- Laboratory of Immunopathology and Infectious Agents - LIAI, UNIPEX - Experimental Research Unity, Sector 5, Medical School of Botucatu, São Paulo State University (UNESP), Botucatu, Brazil
| | - Ana Laura Ortega Dezen
- Laboratory of Immunopathology and Infectious Agents - LIAI, UNIPEX - Experimental Research Unity, Sector 5, Medical School of Botucatu, São Paulo State University (UNESP), Botucatu, Brazil
| | - Amanda Manoel Della Coletta
- Laboratory of Immunopathology and Infectious Agents - LIAI, UNIPEX - Experimental Research Unity, Sector 5, Medical School of Botucatu, São Paulo State University (UNESP), Botucatu, Brazil
| | - Kaio Shu Tsyr Yu
- Laboratory of Immunopathology and Infectious Agents - LIAI, UNIPEX - Experimental Research Unity, Sector 5, Medical School of Botucatu, São Paulo State University (UNESP), Botucatu, Brazil
| | - Larissa Carvalho
- Laboratory of Immunopathology and Infectious Agents - LIAI, UNIPEX - Experimental Research Unity, Sector 5, Medical School of Botucatu, São Paulo State University (UNESP), Botucatu, Brazil
| | - Leandro Alves Dos Santos
- Confocal Microscopy Laboratory, UNIPEX - Experimental Research Unity, Medical School of Botucatu, São Paulo State University (UNESP), Botucatu, Brazil
| | - Igor de Carvalho Deprá
- Laboratory of Genetic Basis of Endocrinological Diseases, Experimental Research Unity (UNIPEX), Sector 5, São Paulo State University (UNESP), Botucatu, Brazil
| | - Rachel M Kratofil
- Calvin, Phoebe, and Joan Snyder Institute for Chronic Diseases, University of Calgary, Calgary, AB, Canada.,Department of Physiology and Pharmacology, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada.,Department of Microbiology, Immunology and Infectious Diseases, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada
| | - Michelle Elizabeth Willson
- Calvin, Phoebe, and Joan Snyder Institute for Chronic Diseases, University of Calgary, Calgary, AB, Canada.,Department of Physiology and Pharmacology, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada.,Department of Microbiology, Immunology and Infectious Diseases, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada
| | - Lori Zbytnuik
- Calvin, Phoebe, and Joan Snyder Institute for Chronic Diseases, University of Calgary, Calgary, AB, Canada.,Department of Physiology and Pharmacology, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada.,Department of Microbiology, Immunology and Infectious Diseases, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada
| | - Paul Kubes
- Calvin, Phoebe, and Joan Snyder Institute for Chronic Diseases, University of Calgary, Calgary, AB, Canada.,Department of Physiology and Pharmacology, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada.,Department of Microbiology, Immunology and Infectious Diseases, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada
| | | | - Luciane Alarcão Dias-Melicio
- Laboratory of Immunopathology and Infectious Agents - LIAI, UNIPEX - Experimental Research Unity, Sector 5, Medical School of Botucatu, São Paulo State University (UNESP), Botucatu, Brazil.,Confocal Microscopy Laboratory, UNIPEX - Experimental Research Unity, Medical School of Botucatu, São Paulo State University (UNESP), Botucatu, Brazil.,Department of Pathology, Medical School of Botucatu, São Paulo State University (UNESP), Botucatu, Brazil
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3
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Identification and Analysis of the Role of Superoxide Dismutases Isoforms in the Pathogenesis of Paracoccidioides spp. PLoS Negl Trop Dis 2016; 10:e0004481. [PMID: 26963091 PMCID: PMC4786090 DOI: 10.1371/journal.pntd.0004481] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2015] [Accepted: 02/01/2016] [Indexed: 12/03/2022] Open
Abstract
The ability of Paracoccidioides to defend itself against reactive oxygen species (ROS) produced by host effector cells is a prerequisite to survive. To counteract these radicals, Paracoccidioides expresses, among different antioxidant enzymes, superoxide dismutases (SODs). In this study, we identified six SODs isoforms encoded by the Paracoccidioides genome. We determined gene expression levels of representative isolates of the phylogenetic lineages of Paracoccidioides spp. (S1, PS2, PS3 and Pb01-like) using quantitative RT-PCR. Assays were carried out to analyze SOD gene expression of yeast cells, mycelia cells, the mycelia-to-yeast transition and the yeast-to-mycelia germination, as well as under treatment with oxidative agents and during interaction with phagocytic cells. We observed an increased expression of PbSOD1 and PbSOD3 during the transition process, exposure to oxidative agents and interaction with phagocytic cells, suggesting that these proteins could assist in combating the superoxide radicals generated during the host-pathogen interaction. Using PbSOD1 and PbSOD3 knockdown strains we showed these genes are involved in the response of the fungus against host effector cells, particularly the oxidative stress response, and in a mouse model of infection. Protein sequence analysis together with functional analysis of knockdown strains seem to suggest that PbSOD3 expression is linked with a pronounced extracellular activity while PbSOD1 seems more related to intracellular requirements of the fungus. Altogether, our data suggests that P. brasiliensis actively responds to the radicals generated endogenously during metabolism and counteracts the oxidative burst of immune cells by inducing the expression of SOD isoforms. Paracoccidioidomycosis is a health-threatening human systemic mycosis, endemic to some Latin America countries. The disease is caused by species belonging to the Paracoccidioides genus. Once inside the human host, Paracoccidioides must face the host innate immune system, escaping from the cytotoxic capacity of innate immune cells (ROS production and liberation of polypeptide antibiotics). To do so, they express and synthetize superoxide dismutases (SODs). We aimed to identify and characterize the SOD isoforms present in the Paracoccidioides genome. We identified six isoforms, among which we found an increased expression of PbSOD1 and PbSOD3 during the transition-to-yeast process, exposure to oxidative agents and interaction with phagocytic cells. Additionally, we found that PbSOD3 expression might be linked with a pronounced extracellular activity while PbSOD1 and the other isoforms seem more related to intracellular requirements of the fungus. We propose that the defence against endogenous-produced ROS may depend on intracellular Sods (mostly SOD1, but possibly also SOD2, SOD4 and SOD5), but defence against extracellular ROS (produced during host-pathogen interactions) might rely to a greater extent on SOD3, which is endowed with an extracellular activity.
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Mejía SP, Cano LE, López JA, Hernandez O, González Á. Human neutrophils produce extracellular traps against Paracoccidioides brasiliensis. MICROBIOLOGY-SGM 2015; 161:1008-1017. [PMID: 25701733 DOI: 10.1099/mic.0.000059] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Received: 12/11/2014] [Accepted: 02/13/2015] [Indexed: 12/20/2022]
Abstract
Neutrophils play an important role as effector cells and contribute to the resistance of the host against microbial pathogens. Neutrophils are able to produce extracellular traps (NETs) in response to medically important fungi, including Aspergillus spp., Candida albicans and Cryptococcus gattii. However, NET production in response to Paracoccidioides brasiliensis has yet to be studied. We have demonstrated that human neutrophils produce NETs against both conidia and yeasts of P. brasiliensis. Although the NADPH oxidase inhibitor diphenyleneiodonium chloride (DPI) did not alter NET production against conidia, it partially suppressed NET formation against P. brasiliensis yeasts. Cytochalasin D or IFN-γ did not affect the production of NETs against the fungus. Additionally, a mutant strain of P. brasiliensis with reduced expression of an alternative oxidase induced significantly higher levels of NETs in comparison with the WT strain. Finally, c.f.u. quantification of P. brasiliensis showed no significant differences when neutrophils were treated with DPI, DNase I or cytochalasin D as compared with untreated cells. These data establish that NET formation by human neutrophils appears to be either dependent or independent of reactive oxygen species production, correlating with the fungal morphotype used for stimulation. However, this mechanism was ineffective in killing the fungus.
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Affiliation(s)
- Susana P Mejía
- School of Microbiology, Universidad de Antioquia, Calle 70 no. 52-51, Medellín, Colombia.,Medical and Experimental Mycology Group, Corporación para Investigaciones Biológicas (CIB), Carrera 72A no. 78B 141, Medellín, Colombia
| | - Luz E Cano
- School of Microbiology, Universidad de Antioquia, Calle 70 no. 52-51, Medellín, Colombia.,Medical and Experimental Mycology Group, Corporación para Investigaciones Biológicas (CIB), Carrera 72A no. 78B 141, Medellín, Colombia
| | - Juan A López
- Basic and Applied Microbiology Research Group (MICROBA), School of Microbiology, Universidad de Antioquia, Calle 70 no. 52-51, Medellín, Colombia
| | - Orville Hernandez
- Cellular and Molecular Biology Unit, Corporación para Investigaciones Biológicas (CIB), Carrera 72A no. 78B 141, Medellín, Colombia.,Basic and Applied Microbiology Research Group (MICROBA), School of Microbiology, Universidad de Antioquia, Calle 70 no. 52-51, Medellín, Colombia
| | - Ángel González
- Basic and Applied Microbiology Research Group (MICROBA), School of Microbiology, Universidad de Antioquia, Calle 70 no. 52-51, Medellín, Colombia
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Burger E, Mendes ACSC, Bani GMAC, Brigagão MRPL, Santos GB, Malaquias LCC, Chavasco JK, Verinaud LM, de Camargo ZP, Hamblin MR, Sperandio FF. Low-level laser therapy to the mouse femur enhances the fungicidal response of neutrophils against Paracoccidioides brasiliensis. PLoS Negl Trop Dis 2015; 9:e0003541. [PMID: 25675431 PMCID: PMC4326423 DOI: 10.1371/journal.pntd.0003541] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2014] [Accepted: 01/14/2015] [Indexed: 12/23/2022] Open
Abstract
Neutrophils (PMN) play a central role in host defense against the neglected fungal infection paracoccidioidomycosis (PCM), which is caused by the dimorphic fungus Paracoccidioides brasiliensis (Pb). PCM is of major importance, especially in Latin America, and its treatment relies on the use of antifungal drugs. However, the course of treatment is lengthy, leading to side effects and even development of fungal resistance. The goal of the study was to use low-level laser therapy (LLLT) to stimulate PMN to fight Pb in vivo. Swiss mice with subcutaneous air pouches were inoculated with a virulent strain of Pb or fungal cell wall components (Zymosan), and then received LLLT (780 nm; 50 mW; 12.5 J/cm2; 30 seconds per point, giving a total energy of 0.5 J per point) on alternate days at two points on each hind leg. The aim was to reach the bone marrow in the femur with light. Non-irradiated animals were used as controls. The number and viability of the PMN that migrated to the inoculation site was assessed, as well as their ability to synthesize proteins, produce reactive oxygen species (ROS) and their fungicidal activity. The highly pure PMN populations obtained after 10 days of infection were also subsequently cultured in the presence of Pb for trials of protein production, evaluation of mitochondrial activity, ROS production and quantification of viable fungi growth. PMN from mice that received LLLT were more active metabolically, had higher fungicidal activity against Pb in vivo and also in vitro. The kinetics of neutrophil protein production also correlated with a more activated state. LLLT may be a safe and non-invasive approach to deal with PCM infection. PCM triggers a typical granulomatous inflammatory reaction with PMN playing a major role; these inflammatory cells are crucial in the initial stages of PCM, participating in the innate immune reaction and also directing the acquired immune response in the later stages. In some PCM patients, these immune mechanisms are insufficient to eradicate the infection, and need to be boosted with antifungal drugs that have to be administered for long periods and can show serious side-effects. We aimed to develop a novel and safe way to activate PMN through low-level laser irradiation of the bone marrow in the mouse femoral medulla. LLLT increased PMN viability and activation, shown by a significantly greater production of protein and ROS, as well as a higher fungicidal capacity; PMN even retained their higher metabolic activity and fungicidal ability after a second exposure to the pathogenic fungus in vitro. This is the first time that LLLT has been shown to increase the immune response against a fungal infection, and could be a promising and safe technique to be used with antifungal drugs in PCM.
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Affiliation(s)
- Eva Burger
- Department of Microbiology and Immunology, Institute of Biomedical Sciences, Federal University of Alfenas (UNIFAL-MG), Alfenas, Minas Gerais, Brazil
| | - Ana Carolina S. C. Mendes
- Department of Microbiology and Immunology, Institute of Biomedical Sciences, Federal University of Alfenas (UNIFAL-MG), Alfenas, Minas Gerais, Brazil
| | - Giulia M. A. C. Bani
- Department of Microbiology and Immunology, Institute of Biomedical Sciences, Federal University of Alfenas (UNIFAL-MG), Alfenas, Minas Gerais, Brazil
| | - Maísa R. P. L. Brigagão
- Department of Biochemistry, Institute of Biomedical Sciences, Federal University of Alfenas (UNIFAL-MG), Alfenas, Minas Gerais, Brazil
| | - Gérsika B. Santos
- Department of Biochemistry, Institute of Biomedical Sciences, Federal University of Alfenas (UNIFAL-MG), Alfenas, Minas Gerais, Brazil
| | - Luiz Cosme C. Malaquias
- Department of Microbiology and Immunology, Institute of Biomedical Sciences, Federal University of Alfenas (UNIFAL-MG), Alfenas, Minas Gerais, Brazil
| | - Jorge Kleber Chavasco
- Department of Microbiology and Immunology, Institute of Biomedical Sciences, Federal University of Alfenas (UNIFAL-MG), Alfenas, Minas Gerais, Brazil
| | - Liana M. Verinaud
- Department of Structural and Functional Biology, Institute of Biology, State University of Campinas (UNICAMP), Campinas, São Paulo, Brazil
| | - Zoilo P. de Camargo
- Department of Microbiology, Immunology and Parasitology, Federal University of São Paulo (UNIFESP), São Paulo, São Paulo, Brazil
| | - Michael R. Hamblin
- Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, Massachusetts, United States of America
- Department of Dermatology, Harvard Medical School, Boston, Massachusetts, United States of America
- Harvard—MIT Division of Health Sciences and Technology, Cambridge, Massachusetts, United States of America
| | - Felipe F. Sperandio
- Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, Massachusetts, United States of America
- Department of Dermatology, Harvard Medical School, Boston, Massachusetts, United States of America
- Department of Pathology and Parasitology, Institute of Biomedical Sciences, Federal University of Alfenas (UNIFAL-MG), Alfenas, Minas Gerais, Brazil
- * E-mail: ,
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Tavares AH, Magalhães KG, Almeida RDN, Correa R, Burgel PH, Bocca AL. NLRP3 inflammasome activation by Paracoccidioides brasiliensis. PLoS Negl Trop Dis 2013; 7:e2595. [PMID: 24340123 PMCID: PMC3855149 DOI: 10.1371/journal.pntd.0002595] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2013] [Accepted: 10/31/2013] [Indexed: 12/11/2022] Open
Abstract
Paracoccidioides brasiliensis is the etiologic agent of paracoccidioidomycosis (PCM), the most prevalent systemic mycosis that is geographically confined to Latin America. The pro-inflammatory cytokine IL-1β that is mainly derived from the activation of the cytoplasmic multiprotein complex inflammasome is an essential host factor against opportunistic fungal infections; however, its role in infection with a primary fungal pathogen, such as P. brasiliensis, is not well understood. In this study, we found that murine bone marrow-derived dendritic cells responded to P. brasiliensis yeast cells infection by releasing IL-1β in a spleen tyrosine kinase (Syk), caspase-1 and NOD-like receptor (NLR) family member NLRP3 dependent manner. In addition, P. brasiliensis-induced NLRP3 inflammasome activation was dependent on potassium (K+) efflux, reactive oxygen species production, phagolysosomal acidification and cathepsin B release. Finally, using mice lacking the IL-1 receptor, we demonstrated that IL-1β signaling has an important role in killing P. brasiliensis by murine macrophages. Altogether, our results demonstrate that the NLRP3 inflammasome senses and responds to P. brasiliensis yeast cells infection and plays an important role in host defense against this fungus. Paracoccidioidomycosis is a systemic disease that has an important mortality and morbidity impact in Latin America. It mainly affects rural workers of Argentina, Colombia, Venezuela and Brazil. Upon host infection, one of the most important aspects that contribute to the disease outcome is the initial interaction of the Paracoccidioides brasiliensis fungus with the phagocytic cells and the induction of the inflammatory process. Among several inflammatory mediators, the cytokine interleukin-1β is of pivotal importance in this complex process. Here, we demonstrate that P. brasiliensis is sensed by the NLRP3 inflammasome, a cytoplasmatic multiprotein complex that lead to the processing and secretion of IL-1β. In addition, we described the intracellular perturbations that may be associated with NLRP3 activation such as potassium efflux, production of reactive oxygen species, and lysosomal damage. Finally, our work provides evidence for the protective role of IL-1β during fungal infection of murine macrophages.
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Affiliation(s)
- Aldo Henrique Tavares
- Faculdade de Ceilândia, Universidade de Brasília, Brasília, Distrito Federal, Brasil
- Laboratorio de Imunologia Aplicada, Departamento de Biologia Celular, Instituto de Biologia, Universidade de Brasília, Brasília, Distrito Federal, Brasil
- * E-mail: .
| | - Kelly Grace Magalhães
- Laboratorio de Imunologia e Inflamação, Departamento de Biologia Celular, Instituto de Biologia, Universidade de Brasília, Brasília, Distrito Federal, Brasil
| | - Raquel Das Neves Almeida
- Laboratorio de Imunologia e Inflamação, Departamento de Biologia Celular, Instituto de Biologia, Universidade de Brasília, Brasília, Distrito Federal, Brasil
| | - Rafael Correa
- Laboratorio de Imunologia e Inflamação, Departamento de Biologia Celular, Instituto de Biologia, Universidade de Brasília, Brasília, Distrito Federal, Brasil
| | - Pedro Henrique Burgel
- Laboratorio de Imunologia Aplicada, Departamento de Biologia Celular, Instituto de Biologia, Universidade de Brasília, Brasília, Distrito Federal, Brasil
| | - Anamélia Lorenzetti Bocca
- Laboratorio de Imunologia Aplicada, Departamento de Biologia Celular, Instituto de Biologia, Universidade de Brasília, Brasília, Distrito Federal, Brasil
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7
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Acorci MJ, Dias-Melicio LA, Golim MA, Bordon-Graciani AP, Peraçoli MTS, Soares AMVC. Inhibition of human neutrophil apoptosis by Paracoccidioides brasiliensis: role of interleukin-8. Scand J Immunol 2008; 69:73-9. [PMID: 19144080 DOI: 10.1111/j.1365-3083.2008.02199.x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Paracoccidioidomycosis (PCM) is a systemic mycosis caused by Paracoccidiodes brasiliensis that presents a wide spectrum of clinical manifestations. Because of the great number of neutrophils polymorphonuclear neutrophils (PMN) found in the P. brasiliensis granuloma, studies have been done to evaluate the role of these cells during the development of the infection. This fungus is found intracellularly in PMN and monocytes/macrophages, suggesting that it is capable of evading damage and surviving inside these cells. Thus, in the present study, we investigated whether P. brasiliensis can prolong the lifetime of PMN, and if this process would be related with IL-8 levels. PMN apoptosis and intracellular levels of IL-8 were analysed by flow cytometry and culture supernatants IL-8 levels were evaluated by enzyme-linked immunosorbent assay. We found that coincubation with P. brasiliensis yeast cells results in an inhibition of PMN apoptosis, which was associated with increase in IL-8 production by these cells. Cocultures treatment with monoclonal antibody anti-IL-8 reversed the inhibitory effect of P. brasiliensis on PMN apoptosis, besides to increase spontaneous apoptosis of these cells. These data show that, in contrast to other microbial pathogens that drive phagocytes into apoptosis to escape killing, P. brasiliensis can extend the lifetime of normal human PMN by inducing autocrine IL-8 production.
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Affiliation(s)
- M J Acorci
- Department of Microbiology and Immunology, Biosciences Institute, São Paulo State University, Botucatu, SP, Brazil
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8
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Fernanda Reis Gavazzoni Dias M, Mesquita J, Lima Filgueira A, De Souza W. Human neutrophils susceptibility toParacoccidioides brasiliensis: an ultrastructural and cytochemical assay. Med Mycol 2008; 46:241-9. [DOI: 10.1080/13693780701824411] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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9
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Calich VLG, Pina A. Response to “Unfair to ignore long-established line of published research”. J Leukoc Biol 2007; 81:858-859. [DOI: 10.1189/jlb.1206740] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2006] [Accepted: 12/20/2006] [Indexed: 11/24/2022] Open
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