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Padilla AM, Rosenberg C, Cook P, Sanchez-Valdez F, McElhannon C, Tarleton RL. Delayed Activation of T Cells at the Site of Infection Facilitates the Establishment of Trypanosoma cruzi in Both Naive and Immune Hosts. mSphere 2023; 8:e0060122. [PMID: 36695605 PMCID: PMC9942555 DOI: 10.1128/msphere.00601-22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2022] [Accepted: 12/16/2022] [Indexed: 01/26/2023] Open
Abstract
Although parasite entry through breaks in the skin or mucosa is one of the main routes of natural transmission of Trypanosoma cruzi, little is known about the host cell types initially invaded nor the ability of those host cells to initiate immune responses at the site of infection. To gain insights into these early events, we studied the fate of fluorescently tagged T. cruzi delivered subcutaneously in mouse footpads or ears. We demonstrate that the majority of parasites introduced into the skin initially proliferate there until 8 to 10 days postinfection, when the parasite load decreases. This decline in parasite numbers is dependent on the presence of an intact T cell compartment and on the ability of hosts to produce gamma interferon (IFN-γ). Many of the parasite-containing cells at the initial infection site display a macrophage/monocyte phenotype but with low expression of activation markers, suggesting that these cells provide an early niche for T. cruzi proliferation, rather than being active in parasite control. It is only after the first round of T. cruzi replication and release from host cells that signs of immune activation and control of parasites become apparent. The delay in the activation and failure to rapidly control parasite replication are observed even when T. cruzi-primed T cells are present, such as in chronically infected mice. This failure of a primed immune system to recognize and react prior to extensive parasite expansion at the infection site likely poses a significant challenge for the development of vaccines aiming to prevent T. cruzi infection. IMPORTANCE Trypanosoma cruzi, the parasite causing Chagas disease, usually infects through the mucosa or breaks in the skin, but little is known about the parasite's fate at the site of entry or the early events involving immune control there. Here, we track the local proliferation and subsequent dissemination of fluorescently tagged T. cruzi and the initial immune response at the point of entry. We show that T. cruzi preferentially infects innate immune cells in the skin and that the stimulation of an adaptive T cell response does not occur until after the release of parasites from this first round of infected host cells. This first immunologically "silent" proliferation occurs even in the presence of a strong immune T cell memory generated by previous infection. This capacity of T. cruzi to establish infections while avoiding initial immune recognition has important implications for the potential to develop vaccines to prevent T. cruzi infection.
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Affiliation(s)
- Angel M. Padilla
- Department of Cellular Biology, University of Georgia, Athens, Georgia, USA
- Center for Tropical and Emerging Global Diseases, University of Georgia, Athens, Georgia, USA
| | - Charles Rosenberg
- Center for Tropical and Emerging Global Diseases, University of Georgia, Athens, Georgia, USA
- Department of Microbiology, University of Georgia, Athens, Georgia, USA
| | - Peter Cook
- Medical Research Council Centre for Medical Mycology, University of Exeter, Exeter, United Kingdom
| | - Fernando Sanchez-Valdez
- Center for Tropical and Emerging Global Diseases, University of Georgia, Athens, Georgia, USA
| | - Caroline McElhannon
- Department of Cellular Biology, University of Georgia, Athens, Georgia, USA
- Center for Tropical and Emerging Global Diseases, University of Georgia, Athens, Georgia, USA
| | - Rick L. Tarleton
- Department of Cellular Biology, University of Georgia, Athens, Georgia, USA
- Center for Tropical and Emerging Global Diseases, University of Georgia, Athens, Georgia, USA
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Rigazio CS, Mariz-Ponte N, Caballero EP, Penas FN, Goren NB, Santamaría MH, Corral RS. Involvement of glycoinositolphospholipid from Trypanosoma cruzi and macrophage migration inhibitory factor in proinflammatory mechanisms promoting cardiovascular injury mechanisms promoting cardiovascular inflammation tThe combined action of glycoinositolphospholipid from Trypanosoma cruzi and macrophage migration inhibitory factor increases proinflammatory mediator production by cardiomyocytes and vascular endothelial cells. Microb Pathog 2022; 173:105881. [DOI: 10.1016/j.micpath.2022.105881] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2022] [Revised: 11/08/2022] [Accepted: 11/09/2022] [Indexed: 11/14/2022]
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Characterisation of Macrophage Polarisation in Mice Infected with Ninoa Strain of Trypanosoma cruzi. Pathogens 2021; 10:pathogens10111444. [PMID: 34832600 PMCID: PMC8622189 DOI: 10.3390/pathogens10111444] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2021] [Revised: 10/09/2021] [Accepted: 10/26/2021] [Indexed: 11/16/2022] Open
Abstract
Macrophages (MΦ) play a key role in the development of the protective immune response against Trypanosoma cruzi infection. To determine the role of MΦ subtypes M1 and M2 in the development of immunity against the Mexican strain of T. cruzi (Ninoa strain), we have analysed in a time course the infection and characterised the M1 and M2 subtypes in two mouse models, BALB/c and C57BL/6. After infection, BALB/c mice developed an increased blood parasite load and the parasites were cleared from the blood one week later than in C57BL/6 mice. However, similar cellular infiltrate and cardiac alterations were observed between BALB/c and C57BL/6 mice. At 36 days, the T. cruzi infection differentially modulated the expression of immune cells, and both the BALB/c and C57BL/6 mice significantly reduced TCD4+ cells. However, BALB/c mice produced significantly more TCD8+ than C57BL/6 mice in the spleen and lymph nodes. Furthermore, BALB/c mice produce significantly more MΦ in the spleen, while C57BL/6 produce similar levels to uninfected mice. The M1 MΦ ratio increased significantly at 3-5 days post-infection (dpi), but then decreased slightly. On the contrary, the M2 MΦ were low at the beginning of the infection, but the proportion of M1 and M2 MΦ at 36 dpi was similar. Importantly, the MΦ subtypes M2c and M2d significantly increased the induction of tissue repair by the end of the acute phase of the infection. These results indicate that the Ninoa strain has developed strategies to modulate the immune response, with fine differences depending on the genetic background of the host.
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Nájera CA, Batista MF, Meneghelli I, Bahia D. Mixed signals - how Trypanosoma cruzi exploits host-cell communication and signaling to establish infection. J Cell Sci 2021; 134:134/5/jcs255687. [PMID: 33692153 DOI: 10.1242/jcs.255687] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Chagas disease (American trypanosomiasis) is a 'neglected' pathology that affects millions of people worldwide, mainly in Latin America. Trypanosoma cruzi, the causative agent, is an obligate intracellular parasite with a complex and diverse biology that infects several mammalian species, including humans. Because of genetic variability among strains and the presence of four biochemically and morphologically distinct parasite forms, the outcome of T. cruzi infection varies considerably depending on host cell type and parasite strain. During the initial contact, cellular communication is established by host-recognition-mediated responses, followed by parasite adherence and penetration. For this purpose, T. cruzi expresses a variety of proteins that modify the host cell, enabling it to safely reach the cytoplasm. After entry into the host cell, T. cruzi forms a transitory structure termed 'parasitophorous vacuole' (PV), followed by its cytoplasmic replication and differentiation after PV rupture, and subsequent invasion of other cells. The success of infection, maintenance and survival inside host cells is facilitated by the ability of T. cruzi to subvert various host signaling mechanisms. We focus in this Review on the various mechanisms that induce host cytoskeletal rearrangements, activation of autophagy-related proteins and crosstalk among major immune response regulators, as well as recent studies on the JAK-STAT pathway.
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Affiliation(s)
- Carlos Acides Nájera
- Departamento de Genética, Ecologia e Evolução, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, 486, Brazil
| | - Marina Ferreira Batista
- Departamento de Genética, Ecologia e Evolução, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, 486, Brazil
| | - Isabela Meneghelli
- Departamento de Genética, Ecologia e Evolução, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, 486, Brazil
| | - Diana Bahia
- Departamento de Genética, Ecologia e Evolução, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, 486, Brazil
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Medina-Buelvas DM, Estrada-Muñiz E, Rodríguez-Sosa M, Shibayama M, Vega L. Increased heart fibrosis and acute infection in a murine Chagas disease model associated with organophosphorus pesticide metabolite exposure. Sci Rep 2019; 9:17539. [PMID: 31772338 PMCID: PMC6879754 DOI: 10.1038/s41598-019-54218-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2019] [Accepted: 11/10/2019] [Indexed: 12/16/2022] Open
Abstract
Some reports suggest that exposure to organophosphorus (OP) pesticides increases the incidence of infections. Ethylated dialkylphosphates (EtDAPs) are metabolites of OP pesticides widely distributed with immunomodulatory potential. Chagas disease is produced by Trypanosoma cruzi parasites, and resolution of this infection requires the activation of inflammatory macrophages (MΦ), which results in cardiac fibrosis. Some reports indicate that EtDAPs increase the amount of the anti-inflammatory alternatively activated MΦ (M2; CD206+F4/80+). Therefore, we analyzed the course of T. cruzi infection, MΦ profiles from peritoneal exudate cells (PECs), inflammatory cell infiltration and fibrosis in the heart of BALB/c mice exposed to diethyldithiophosphate (DEDTP), diethylthiophosphate (DETP) or diethylphosphate (DEP, 0.01 g/kg), common DAPs produced by OP pesticides, 24 h before infection with T. cruzi. We found that DEDTP increased the parasite burden in blood by 99% at the peak of the infection and enhanced the myocardial damage due to an increase in infiltrated inflammatory cells (induced by DEDTP or DETP) and fibrosis (induced by EtDAPs). In the PECs, exposure to EtDAPs increased the proportion of the MΦ subpopulations of M2a, M2b and M2d, which are associated with tissue repair. These results indicate that exposure to EtDAPs can exacerbate the acute phase of a parasitic infection and increase the long-term damage to the heart.
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Affiliation(s)
- Dunia Margarita Medina-Buelvas
- Department of Toxicology, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Av. Instituto Politécnico Nacional 2508, San Pedro Zacatenco, CP 07360, Gustavo A. Madero, Ciudad de México, México
| | - Elizabet Estrada-Muñiz
- Department of Toxicology, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Av. Instituto Politécnico Nacional 2508, San Pedro Zacatenco, CP 07360, Gustavo A. Madero, Ciudad de México, México
| | - Miriam Rodríguez-Sosa
- Biomedicine Unit, Facultad de Estudios Superiores Iztacala, Universidad Nacional Autónoma de México (UNAM), Avenida de los Barrios 1, Los Reyes Iztacala, CP 54090, Tlalnepantla, Estado de México, México
| | - Mineko Shibayama
- Department of Infectomics and Molecular Pathogenesis, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Av. Instituto Politécnico Nacional 2508, San Pedro Zacatenco, CP 07360, Gustavo A. Madero, Ciudad de México, México
| | - Libia Vega
- Department of Toxicology, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Av. Instituto Politécnico Nacional 2508, San Pedro Zacatenco, CP 07360, Gustavo A. Madero, Ciudad de México, México.
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Napoletano C, Mattiucci S, Colantoni A, Battisti F, Zizzari IG, Rahimi H, Nuti M, Rughetti A. Anisakis pegreffii impacts differentiation and function of human dendritic cells. Parasite Immunol 2019; 40:e12527. [PMID: 29569735 DOI: 10.1111/pim.12527] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2017] [Accepted: 03/13/2018] [Indexed: 02/07/2023]
Abstract
Human dendritic cells (DCs) show remarkable phenotypic changes when matured in the presence of helminth-derived products. These modifications frequently elicited a polarization towards Th2 cells and regulatory T cells thus contributing to immunological tolerance against these pathogens. In this study, the interaction between DCs and larvae of the zoonotic anisakid nematode Anisakis pegreffii was investigated. A. pegreffii larvae were collected from fish hosts, and monocyte-derived DCs were cocultured in the presence of the live larvae (L) or its crude extracts (CE). In both experimental conditions, A. pegreffii impacted DC viability, hampered DC maturation by reducing the expression of molecules involved in antigen presentation and migration (ie HLA-DR, CD86, CD83 and CCR7), increased the phagosomal radical oxygen species (ROS) levels and modulated the phosphorylation of ERK1,2 pathway. These biological changes were accompanied by the impairment of DCs to activate a T-cell-mediated IFNγ. Interestingly, live larvae appeared to differently modulate DC secretion of cytokines and chemokines as compared to CE. These results demonstrate, for the first time, the immunomodulatory role of A. pegreffii on DCs biology and functions. In addition, they suggest a dynamic contribution of DCs to the induction and maintenance of the inflammatory response against A. pegreffii.
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Affiliation(s)
- C Napoletano
- Department of Experimental Medicine, "Sapienza" University of Rome, Rome, Italy
| | - S Mattiucci
- Department of Public Health and Infectious Diseases, Laboratory affiliated to Istituto Pasteur Italia - Fondazione Cenci Bolognetti, University Hospital "Policlinico Umberto I", "Sapienza" University of Rome, Rome, Italy
| | - A Colantoni
- Department of Public Health and Infectious Diseases, Laboratory affiliated to Istituto Pasteur Italia - Fondazione Cenci Bolognetti, University Hospital "Policlinico Umberto I", "Sapienza" University of Rome, Rome, Italy
| | - F Battisti
- Department of Experimental Medicine, "Sapienza" University of Rome, Rome, Italy
| | - I G Zizzari
- Department of Experimental Medicine, "Sapienza" University of Rome, Rome, Italy
| | - H Rahimi
- Department of Experimental Medicine, "Sapienza" University of Rome, Rome, Italy
| | - M Nuti
- Department of Experimental Medicine, "Sapienza" University of Rome, Rome, Italy
| | - A Rughetti
- Department of Experimental Medicine, "Sapienza" University of Rome, Rome, Italy
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Zhou DN, Li SJ, Ding JL, Yin TL, Yang J, Ye H. MIF May Participate in Pathogenesis of Polycystic Ovary Syndrome in Rats through MAPK Signalling Pathway. Curr Med Sci 2018; 38:853-860. [PMID: 30341520 DOI: 10.1007/s11596-018-1953-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2017] [Revised: 09/04/2018] [Indexed: 12/20/2022]
Abstract
The polycystic ovary syndrome (PCOS) model was established in rats and correlation between the expression of macrophage migration inhibitory factor (MIF) and cytokinesis with the MAPK signalling pathway in the rat ovary was measured. The PCOS model in rats was established by dehydroepiandrosterone (DHEA). Thirty sexually immature female Sprague-Dawley rats were randomly and equally assigned to three groups: control group, PCOS group, and PCOS with high-fat diet (HFD) group. Serum hormones were assayed by radioimmunoassay (RIA). The ovaries were immunohistochemically stained with MIF, and the expression of MIF, p-JNK and p-p38 was detected by Western blotting in ovaries. The serum testosterone level, LH concentration, LH/FSH ratio, fasting insulin level and HOMA IR index in the PCOS group (6.077±0.478, 13.809±1.701, 1.820±0.404, 10.83±1.123 and 1.8692±0.1096) and PCOS with HFD group (6.075±0.439, 14.075±1.927, 1.779±0.277, 10.20±1.377 and 1.7736±0.6851) were significantly higher than those in the control group (4.949±0.337, 2.458±0.509, 1.239±0.038, 9.53±0.548 and 1.5329±0.7363), but there was no significant difference between the PCOS group and PCOS with HFD group. The expression levels of MIF, p-JNK, and p-p38 in the PCOS group (0.4048±0.013, 0.6233±0.093 and 0.7987±0.061) and PCOS with HFD group (0.1929±0.012, 0.3346±0.103 and 0.3468±0.031) were obviously higher than those in control group (0.2492±0.013, 0.3271±0.093 and 0.3393±0.061), but no significant difference was observed between PCOS group and PCOS with HFD group. It was suggested that MIF may participate in the pathogenesis of PCOS through the MAPK signalling pathway in PCOS rats induced by DHEA.
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Affiliation(s)
- Dan-Ni Zhou
- Chongqing Institute of Reproduction and Genetics, Chongqing Health Center for Women and Children, Chongqing, 400010, China
| | - Sai-Jiao Li
- Reproductive Medical Center, Hubei Clinic Research Center for Assisted Reproductive Technology and Embryonic Development, Renmin Hospital of Wuhan University, Wuhan, 430060, China
| | - Jin-Li Ding
- Reproductive Medical Center, Hubei Clinic Research Center for Assisted Reproductive Technology and Embryonic Development, Renmin Hospital of Wuhan University, Wuhan, 430060, China
| | - Tai-Lang Yin
- Reproductive Medical Center, Hubei Clinic Research Center for Assisted Reproductive Technology and Embryonic Development, Renmin Hospital of Wuhan University, Wuhan, 430060, China
| | - Jing Yang
- Reproductive Medical Center, Hubei Clinic Research Center for Assisted Reproductive Technology and Embryonic Development, Renmin Hospital of Wuhan University, Wuhan, 430060, China.
| | - Hong Ye
- Chongqing Institute of Reproduction and Genetics, Chongqing Health Center for Women and Children, Chongqing, 400010, China.
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Hügle B, Schippers A, Fischer N, Ohl K, Denecke B, Ticconi F, Vastert B, Costa IG, Haas JP, Tenbrock K. Transcription factor motif enrichment in whole transcriptome analysis identifies STAT4 and BCL6 as the most prominent binding motif in systemic juvenile idiopathic arthritis. Arthritis Res Ther 2018; 20:98. [PMID: 29848367 PMCID: PMC5977738 DOI: 10.1186/s13075-018-1603-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2018] [Accepted: 04/23/2018] [Indexed: 11/22/2022] Open
Abstract
Background The term systemic juvenile idiopathic arthritis (sJIA) describes an autoinflammatory condition characterized by arthritis and severe systemic inflammation, which in later stages can transform into interleukin (IL)-17-driven autoimmune arthritis. IL-1 antagonists have been used with good efficacy in the early stages of sJIA. Methods A whole transcriptome analysis of peripheral blood RNA samples was performed in six patients with sJIA and active systemic disease, before initiating treatment with the IL-1β receptor antagonist anakinra, and after induction of inactive disease, compared with a single-sample control cohort of 21 patients in several clinical stages of sJIA activity. Whole transcriptomes were compared longitudinally and interindividually including gene ontology and motif enrichment analysis of differentially expressed genes. Results There were 741 transcripts were identified using a threshold with a p value <0.01 and a fold change > 2. HLADRB1 and CD74 were identified as the most strongly upregulated genes in inactive compared to active disease; CD177 expression was significantly enhanced in active disease compared to inactive disease. Motif enrichment analysis revealed STAT4, BCL6, and STAT3 as the most prominent transcription factors that were present during active disease. In addition, strong upregulation of the major histocompatability complex II (MHCII) ligand CD74 was found in both active and inactive sJIA compared to healthy controls. Conclusion Using transcription factor motif enrichment, this study identifies novel putative pathways in sJIA (STAT4, BCL6) implicating B cell activation at an earlier stage than predicted in refractory disease. The implication of BCL-6 dependent pathways argues for occurrence of autoimmunity early within the process of sJIA chronification. Transcriptional regulation of HLA-DRB1, a recently described independent genetic risk factor, in combination with its cooperating partner CD74 in patients where sJIA is confirmed, supports pathogenic involvement in alterations in antigen presentation during sJIA. Electronic supplementary material The online version of this article (10.1186/s13075-018-1603-2) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Boris Hügle
- German Center for Pediatric and Adolescent Rheumatology, Gehfeldstrasse 24, 82467, Garmisch-Partenkirchen, Germany.
| | | | - Nadine Fischer
- German Center for Pediatric and Adolescent Rheumatology, Gehfeldstrasse 24, 82467, Garmisch-Partenkirchen, Germany
| | - Kim Ohl
- Department of Pediatrics, Universitätsklinikum Aachen, Aachen, Germany
| | - Bernd Denecke
- Department of Pediatrics, Universitätsklinikum Aachen, Aachen, Germany
| | - Fabio Ticconi
- IZKF Research Group Bioinformatics, RWTH Aachen Medical Faculty, Aachen, Germany
| | - Bas Vastert
- University Medical Center Utrecht, Utrecht, Netherlands
| | - Ivan G Costa
- IZKF Research Group Bioinformatics, RWTH Aachen Medical Faculty, Aachen, Germany
| | - Johannes-Peter Haas
- German Center for Pediatric and Adolescent Rheumatology, Gehfeldstrasse 24, 82467, Garmisch-Partenkirchen, Germany
| | - Klaus Tenbrock
- Department of Pediatrics, Universitätsklinikum Aachen, Aachen, Germany
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MIF-driven activation of macrophages induces killing of intracellular Trypanosoma cruzi dependent on endogenous production of tumor necrosis factor, nitric oxide and reactive oxygen species. Immunobiology 2017; 222:423-431. [DOI: 10.1016/j.imbio.2016.08.007] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2016] [Revised: 08/08/2016] [Accepted: 08/19/2016] [Indexed: 12/12/2022]
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10
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Mota CM, Oliveira ACM, Davoli-Ferreira M, Silva MV, Santiago FM, Nadipuram SM, Vashisht AA, Wohlschlegel JA, Bradley PJ, Silva JS, Mineo JR, Mineo TWP. Neospora caninum Activates p38 MAPK as an Evasion Mechanism against Innate Immunity. Front Microbiol 2016; 7:1456. [PMID: 27679624 PMCID: PMC5020094 DOI: 10.3389/fmicb.2016.01456] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2016] [Accepted: 08/31/2016] [Indexed: 01/08/2023] Open
Abstract
Due to the high prevalence and economic impact of neosporosis, the development of safe and effective vaccines and therapies against this parasite has been a priority in the field and is crucial to limit horizontal and vertical transmission in natural hosts. Limited data is available regarding factors that regulate the immune response against this parasite and such knowledge is essential in order to understand Neospora caninum induced pathogenesis. Mitogen-activated protein kinases (MAPKs) govern diverse cellular processes, including growth, differentiation, apoptosis, and immune-mediated responses. In that sense, our goal was to understand the role of MAPKs during the infection by N. caninum. We found that p38 phosphorylation was quickly triggered in macrophages stimulated by live tachyzoites and antigen extracts, while its chemical inhibition resulted in upregulation of IL-12p40 production and augmented B7/MHC expression. In vivo blockade of p38 resulted in an amplified production of cytokines, which preceded a reduction in latent parasite burden and enhanced survival against the infection. Additionally, the experiments indicate that the p38 activation is induced by a mechanism that depends on GPCR, PI3K and AKT signaling pathways, and that the phenomena here observed is distinct that those induced by Toxoplasma gondii’s GRA24 protein. Altogether, these results showed that N. caninum manipulates p38 phosphorylation in its favor, in order to downregulate the host’s innate immune responses. Additionally, those results infer that active interference in this signaling pathway may be useful for the development of a new therapeutic strategy against neosporosis.
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Affiliation(s)
- Caroline M Mota
- Laboratory of Immunoparasitology "Dr. Mário Endsfeldz Camargo," Department of Immunology, Institute of Biomedical Sciences, Federal University of Uberlândia Uberlândia, Brazil
| | - Ana C M Oliveira
- Laboratory of Immunoparasitology "Dr. Mário Endsfeldz Camargo," Department of Immunology, Institute of Biomedical Sciences, Federal University of Uberlândia Uberlândia, Brazil
| | - Marcela Davoli-Ferreira
- Department of Biochemistry and Immunology, School of Medicine of Ribeirão Preto, University of São Paulo Ribeirão Preto, Brazil
| | - Murilo V Silva
- Laboratory of Immunoparasitology "Dr. Mário Endsfeldz Camargo," Department of Immunology, Institute of Biomedical Sciences, Federal University of Uberlândia Uberlândia, Brazil
| | - Fernanda M Santiago
- Laboratory of Immunoparasitology "Dr. Mário Endsfeldz Camargo," Department of Immunology, Institute of Biomedical Sciences, Federal University of Uberlândia Uberlândia, Brazil
| | - Santhosh M Nadipuram
- Department of Microbiology, Immunology and Molecular Genetics, University of California, Los Angeles, Los Angeles CA, USA
| | - Ajay A Vashisht
- Department of Biological Chemistry and Institute of Genomics and Proteomics, University of California, Los Angeles, Los Angeles CA, USA
| | - James A Wohlschlegel
- Department of Biological Chemistry and Institute of Genomics and Proteomics, University of California, Los Angeles, Los Angeles CA, USA
| | - Peter J Bradley
- Department of Microbiology, Immunology and Molecular Genetics, University of California, Los Angeles, Los AngelesCA, USA; Molecular Biology Institute, University of California, Los Angeles, Los AngelesCA, USA
| | - João S Silva
- Department of Biochemistry and Immunology, School of Medicine of Ribeirão Preto, University of São Paulo Ribeirão Preto, Brazil
| | - José R Mineo
- Laboratory of Immunoparasitology "Dr. Mário Endsfeldz Camargo," Department of Immunology, Institute of Biomedical Sciences, Federal University of Uberlândia Uberlândia, Brazil
| | - Tiago W P Mineo
- Laboratory of Immunoparasitology "Dr. Mário Endsfeldz Camargo," Department of Immunology, Institute of Biomedical Sciences, Federal University of Uberlândia Uberlândia, Brazil
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Motran CC, Ambrosio LF, Volpini X, Celias DP, Cervi L. Dendritic cells and parasites: from recognition and activation to immune response instruction. Semin Immunopathol 2016; 39:199-213. [DOI: 10.1007/s00281-016-0588-7] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2016] [Accepted: 08/22/2016] [Indexed: 12/20/2022]
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12
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Gil-Jaramillo N, Motta FN, Favali CBF, Bastos IMD, Santana JM. Dendritic Cells: A Double-Edged Sword in Immune Responses during Chagas Disease. Front Microbiol 2016; 7:1076. [PMID: 27471496 PMCID: PMC4943928 DOI: 10.3389/fmicb.2016.01076] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2016] [Accepted: 06/27/2016] [Indexed: 01/24/2023] Open
Abstract
Dendritic cells (DCs) are the most important member of the antigen presenting cells group due to their ability to recognize antigen at the infection site and their high specialized antigen internalization capacity. These cells have central role in connecting the innate and adaptive immune responses against Trypanosoma cruzi, the causative agent of Chagas disease. These first line defense cells modulate host immune response depending on type, maturation level, cytokine milieu and DC receptor involved in the interactions with T. cruzi, influencing the development of the disease clinic forms. Here, we present a review of DCs-T. cruzi interactions both in human and murine models, pointing out the parasite ability to manipulate DCs activity for the purpose of evading innate immune response and assuring its own survival and persistence.
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Affiliation(s)
- Natalia Gil-Jaramillo
- Laboratório de Interação Patógeno-Hospedeiro, Instituto de Biologia, Universidade de BrasíliaBrasília, Brazil
| | - Flávia N. Motta
- Laboratório de Interação Patógeno-Hospedeiro, Instituto de Biologia, Universidade de BrasíliaBrasília, Brazil
- Faculdade de Ceilândia, Universidade de BrasíliaBrasília, Brazil
| | - Cecília B. F. Favali
- Laboratório de Biologia do Gene, Instituto de Biologia, Universidade de BrasíliaBrasília, Brazil
| | - Izabela M. D. Bastos
- Laboratório de Interação Patógeno-Hospedeiro, Instituto de Biologia, Universidade de BrasíliaBrasília, Brazil
| | - Jaime M. Santana
- Laboratório de Interação Patógeno-Hospedeiro, Instituto de Biologia, Universidade de BrasíliaBrasília, Brazil
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13
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Soares-Silva M, Diniz FF, Gomes GN, Bahia D. The Mitogen-Activated Protein Kinase (MAPK) Pathway: Role in Immune Evasion by Trypanosomatids. Front Microbiol 2016; 7:183. [PMID: 26941717 PMCID: PMC4764696 DOI: 10.3389/fmicb.2016.00183] [Citation(s) in RCA: 128] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2015] [Accepted: 02/02/2016] [Indexed: 01/08/2023] Open
Abstract
Leishmania spp. and Trypanosoma cruzi are the causative agents of leishmaniasis and Chagas disease, respectively, two neglected tropical diseases that affect about 25 million people worldwide. These parasites belong to the family Trypanosomatidae, and are both obligate intracellular parasites that manipulate host signaling pathways and the innate immune system to establish infection. Mitogen-activated protein kinases (MAPKs) are serine and threonine protein kinases that are highly conserved in eukaryotes, and are involved in signal transduction pathways that modulate physiological and pathophysiological cell responses. This mini-review highlights existing knowledge concerning the mechanisms that Leishmania spp. and T. cruzi have evolved to target the host’s MAPK signaling pathways and highjack the immune response, and, in this manner, promote parasite maintenance in the host.
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Affiliation(s)
- Mercedes Soares-Silva
- Departamento de Biologia Geral, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais Minas Gerais, Brazil
| | - Flavia F Diniz
- Departamento de Biologia Geral, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais Minas Gerais, Brazil
| | - Gabriela N Gomes
- Departamento de Biologia Geral, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais Minas Gerais, Brazil
| | - Diana Bahia
- Departamento de Biologia Geral, Instituto de Ciências Biológicas, Universidade Federal de Minas GeraisMinas Gerais, Brazil; Departamento de Microbiologia, Imunologia e Parasitologia, Escola Paulista de Medicina, Universidade Federal de São PauloSão Paulo, Brazil
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14
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Sánchez-Zamora YI, Juarez-Avelar I, Vazquez-Mendoza A, Hiriart M, Rodriguez-Sosa M. Altered Macrophage and Dendritic Cell Response in Mif-/- Mice Reveals a Role of Mif for Inflammatory-Th1 Response in Type 1 Diabetes. J Diabetes Res 2016; 2016:7053963. [PMID: 27699180 PMCID: PMC5028830 DOI: 10.1155/2016/7053963] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/31/2016] [Accepted: 07/10/2016] [Indexed: 12/13/2022] Open
Abstract
Macrophage migration inhibitory factor (Mif) is highly expressed in type 1 diabetes mellitus (T1DM). However, there is limited information about how Mif influences the activation of macrophages (Mφ) and dendritic cells (DC) in T1DM. To address this issue, we induced T1DM by administering multiple low doses of streptozotocin (STZ) to Mif-/- or wild-type (Wt) BALB/c mice. We found that Mif-/- mice treated with STZ (Mif-/-STZ) developed lower levels of hyperglycemia, inflammatory cytokines, and specific pancreatic islet antigen- (PIAg-) IgG and displayed reduced cellular infiltration into the pancreatic islets compared to Wt mice treated with STZ (WtSTZ). Moreover, Mφ and DC from Mif-/-STZ displayed lower expression of MHC-II, costimulatory molecules CD80, CD86, and CD40, Toll-like receptor- (TLR-) 2, and TLR-4 than WtSTZ. These changes were associated with a reduced capacity of Mφ and DC from Mif-/-STZ to induce proliferation in ovalbumin-specific T cells. All the deficiencies observed in Mif-/-STZ were recovered by exogenous administration of recombinant Mif. These findings suggest that Mif plays a role in the molecular mechanisms of Mφ and DC activation and drives T cell responses involved in the pathology of T1DM. Therefore, Mif is a potential therapeutic target to reduce the pathology of T1DM.
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Affiliation(s)
- Yuriko Itzel Sánchez-Zamora
- Unidad de Biomedicina, Facultad de Estudios Superiores (FES) Iztacala, Universidad Nacional Autónoma de México (UNAM), 54090 Tlalnepantla, MEX, Mexico
| | - Imelda Juarez-Avelar
- Unidad de Biomedicina, Facultad de Estudios Superiores (FES) Iztacala, Universidad Nacional Autónoma de México (UNAM), 54090 Tlalnepantla, MEX, Mexico
| | | | - Marcia Hiriart
- Departamento de Neurodesarrollo y Fisiología, Instituto de Fisiología Celular, UNAM, 04510 Coyoacán, MEX, Mexico
| | - Miriam Rodriguez-Sosa
- Unidad de Biomedicina, Facultad de Estudios Superiores (FES) Iztacala, Universidad Nacional Autónoma de México (UNAM), 54090 Tlalnepantla, MEX, Mexico
- *Miriam Rodriguez-Sosa:
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15
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Soares-Silva M, Diniz FF, Gomes GN, Bahia D. The Mitogen-Activated Protein Kinase (MAPK) Pathway: Role in Immune Evasion by Trypanosomatids. Front Microbiol 2016. [PMID: 26941717 DOI: 10.3389/fmicb.2016.00183/abstract] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/29/2023] Open
Abstract
Leishmania spp. and Trypanosoma cruzi are the causative agents of leishmaniasis and Chagas disease, respectively, two neglected tropical diseases that affect about 25 million people worldwide. These parasites belong to the family Trypanosomatidae, and are both obligate intracellular parasites that manipulate host signaling pathways and the innate immune system to establish infection. Mitogen-activated protein kinases (MAPKs) are serine and threonine protein kinases that are highly conserved in eukaryotes, and are involved in signal transduction pathways that modulate physiological and pathophysiological cell responses. This mini-review highlights existing knowledge concerning the mechanisms that Leishmania spp. and T. cruzi have evolved to target the host's MAPK signaling pathways and highjack the immune response, and, in this manner, promote parasite maintenance in the host.
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Affiliation(s)
- Mercedes Soares-Silva
- Departamento de Biologia Geral, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais Minas Gerais, Brazil
| | - Flavia F Diniz
- Departamento de Biologia Geral, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais Minas Gerais, Brazil
| | - Gabriela N Gomes
- Departamento de Biologia Geral, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais Minas Gerais, Brazil
| | - Diana Bahia
- Departamento de Biologia Geral, Instituto de Ciências Biológicas, Universidade Federal de Minas GeraisMinas Gerais, Brazil; Departamento de Microbiologia, Imunologia e Parasitologia, Escola Paulista de Medicina, Universidade Federal de São PauloSão Paulo, Brazil
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16
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Johnson JC, Martinez O, Honko AN, Hensley LE, Olinger GG, Basler CF. Pyridinyl imidazole inhibitors of p38 MAP kinase impair viral entry and reduce cytokine induction by Zaire ebolavirus in human dendritic cells. Antiviral Res 2014; 107:102-9. [PMID: 24815087 DOI: 10.1016/j.antiviral.2014.04.014] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2013] [Revised: 04/23/2014] [Accepted: 04/25/2014] [Indexed: 01/03/2023]
Abstract
Antigen presenting cells (APCs), including macrophages and dendritic cells, are early and sustained targets of Ebola virus (EBOV) infection in vivo. Because EBOV activates mitogen-activated protein kinase (MAPK) signaling upon infection of APCs, we evaluated the effect of pyridinyl imidazole inhibitors of p38 MAPK on EBOV infection of human APCs and EBOV mediated cytokine production from human DCs. The p38 MAPK inhibitors reduced viral replication in PMA-differentiated macrophage-like human THP-1 cells with an IC50 of 4.73μM (SB202190), 8.26μM (p38kinhIII) and 8.21μM (SB203580) and primary human monocyte-derived dendritic cells (MDDCs) with an IC50 of 2.67μM (SB202190). Furthermore, cytokine production from EBOV-treated MDDCs was inhibited in a dose-dependent manner. A control pyridinyl imidazole compound failed to inhibit either EBOV infection or cytokine induction. Using an established EBOV virus-like particle (VLP) entry assay, we demonstrate that inhibitor pretreatment blocked VLP entry suggesting that the inhibitors blocked infection and replication at least in part by blocking EBOV entry. Taken together, our results indicate that pyridinyl imidazole p38 MAPK inhibitors may serve as leads for the development of therapeutics to treat EBOV infection.
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Affiliation(s)
- Joshua C Johnson
- Virology Division, United States Army Medical Research Institute of Infectious Diseases, Ft. Detrick, MD 21702, United States
| | - Osvaldo Martinez
- Dept. of Microbiology, Icahn School of Medicine at Mount Sinai, New York, NY 10029, United States
| | - Anna N Honko
- Virology Division, United States Army Medical Research Institute of Infectious Diseases, Ft. Detrick, MD 21702, United States
| | - Lisa E Hensley
- Virology Division, United States Army Medical Research Institute of Infectious Diseases, Ft. Detrick, MD 21702, United States
| | - Gene G Olinger
- Virology Division, United States Army Medical Research Institute of Infectious Diseases, Ft. Detrick, MD 21702, United States
| | - Christopher F Basler
- Dept. of Microbiology, Icahn School of Medicine at Mount Sinai, New York, NY 10029, United States.
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17
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Barbosa B, Paulesu L, Ietta F, Bechi N, Romagnoli R, Gomes A, Favoreto-Junior S, Silva D, Mineo J, Mineo T, Ferro E. Susceptibility to Toxoplasma gondii proliferation in BeWo human trophoblast cells is dose-dependent of macrophage migration inhibitory factor (MIF), via ERK1/2 phosphorylation and prostaglandin E2 production. Placenta 2014; 35:152-62. [DOI: 10.1016/j.placenta.2013.12.013] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/13/2013] [Revised: 12/19/2013] [Accepted: 12/24/2013] [Indexed: 12/21/2022]
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Sánchez-Zamora YI, Rodriguez-Sosa M. The role of MIF in type 1 and type 2 diabetes mellitus. J Diabetes Res 2014; 2014:804519. [PMID: 24527464 PMCID: PMC3910331 DOI: 10.1155/2014/804519] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/09/2013] [Accepted: 12/11/2013] [Indexed: 11/17/2022] Open
Abstract
Autoimmunity and chronic low-grade inflammation are hallmarks of diabetes mellitus type one (T1DM) and type two (T2DM), respectively. Both processes are orchestrated by inflammatory cytokines, including the macrophage migration inhibitory factor (MIF). To date, MIF has been implicated in both types of diabetes; therefore, understanding the role of MIF could affect our understanding of the autoimmune or inflammatory responses that influence diabetic pathology. This review highlights our current knowledge about the involvement of MIF in both types of diabetes in the clinical environment and in experimental disease models.
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Affiliation(s)
- Yuriko I. Sánchez-Zamora
- Unidad de Biomedicina, Facultad de Estudios Superiores-Iztacala, Universidad Nacional Autónoma de México, Avenida de los Barrios No. 1, Los Reyes Iztacala, 54090 Tlalnepantla, MEX, Mexico
| | - Miriam Rodriguez-Sosa
- Unidad de Biomedicina, Facultad de Estudios Superiores-Iztacala, Universidad Nacional Autónoma de México, Avenida de los Barrios No. 1, Los Reyes Iztacala, 54090 Tlalnepantla, MEX, Mexico
- *Miriam Rodriguez-Sosa:
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Terrazas CA, Alcántara-Hernández M, Bonifaz L, Terrazas LI, Satoskar AR. Helminth-excreted/secreted products are recognized by multiple receptors on DCs to block the TLR response and bias Th2 polarization in a cRAF dependent pathway. FASEB J 2013; 27:4547-60. [PMID: 23907435 DOI: 10.1096/fj.13-228932] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Dendritic cells (DCs) recognize pathogens and initiate the T-cell response. The DC-helminth interaction induces an immature phenotype in DCs; as a result, these DCs display impaired responses to TLR stimulation and prime Th2-type responses. However, the DC receptors and intracellular pathways targeted by helminth molecules and their importance in the initiation of the Th2 response are poorly understood. In this report, we found that products excreted/secreted by Taenia crassiceps (TcES) triggered cRAF phosphorylation through MGL, MR, and TLR2. TcES interfered with the LPS-induced NFκB p65 and p38 MAPK signaling pathways. In addition, TcES-induced cRAF signaling pathway was critical for down-regulation of the TLR-mediated DC maturation and secretion of IL-12 and TNF-α. Finally, we show for the first time that blocking cRAF in DCs abolishes their ability to induce Th2 polarization in vitro after TcES exposure. Our data demonstrate a new mechanism by which helminths target intracellular pathways to block DC maturation and efficiently program Th2 polarization.
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Affiliation(s)
- César A Terrazas
- 1A.S., Department of Pathology, The Ohio State University, Columbus, OH 43210, USA.
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20
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Cutrullis RA, Petray PB, Schapachnik E, Sánchez R, Postan M, González MN, Martín V, Corral RS. Elevated serum levels of macrophage migration inhibitory factor are associated with progressive chronic cardiomyopathy in patients with Chagas disease. PLoS One 2013; 8:e57181. [PMID: 23451183 PMCID: PMC3579792 DOI: 10.1371/journal.pone.0057181] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2012] [Accepted: 01/18/2013] [Indexed: 12/27/2022] Open
Abstract
Clinical symptoms of chronic Chagas disease occur in around 30% of the individuals infected with Trypanosoma cruzi and are characterized by heart inflammation and dysfunction. The pathogenesis of chronic chagasic cardiomyopathy (CCC) is not completely understood yet, partially because disease evolution depends on complex host-parasite interactions. Macrophage migration inhibitory factor (MIF) is a pleiotropic proinflammatory cytokine that promotes numerous pathophysiological processes. In the current study, we investigated the link between MIF and CCC progression. Immunohistochemical analysis demonstrated MIF overexpression in the hearts from chronically T. cruzi-infected mice, particularly those showing intense inflammatory infiltration. We also found that MIF exogenously added to parasite-infected murine macrophage cultures is capable of enhancing the production of TNF-α and reactive oxygen species, both with pathogenic roles in CCC. Thus, the integrated action of MIF and other cytokines and chemokines may account for leukocyte influx to the infected myocardium, accompanied by enhanced local production of multiple inflammatory mediators. We further examined by ELISA the level of MIF in the sera from chronic indeterminate and cardiomyopathic chagasic patients, and healthy subjects. CCC patients displayed significantly higher MIF concentrations than those recorded in asymptomatic T. cruzi-infected and uninfected individuals. Interestingly, increased MIF levels were associated with severe progressive Chagas heart disease, in correlation with elevated serum concentration of high sensitivity C-reactive protein and also with several echocardiographic indicators of left ventricular dysfunction, one of the hallmarks of CCC. Our present findings represent the first evidence that enhanced MIF production is associated with progressive cardiac impairment in chronic human infection with T. cruzi, strengthening the relationship between inflammatory response and parasite-driven pathology. These observations contribute to unravel the elements involved in the pathogenesis of CCC and may also be helpful for the design of novel therapies aimed to control long-term morbidity in chagasic patients.
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Affiliation(s)
- Romina A. Cutrullis
- Servicio de Parasitología-Chagas, Hospital de Niños ‘Dr. Ricardo Gutiérrez’, Buenos Aires, Argentina
| | - Patricia B. Petray
- Servicio de Parasitología-Chagas, Hospital de Niños ‘Dr. Ricardo Gutiérrez’, Buenos Aires, Argentina
| | - Edgardo Schapachnik
- Servicio de Cardiología, Hospital General de Agudos ‘Dr. Cosme Argerich’, Buenos Aires, Argentina
| | - Rubén Sánchez
- Servicio de Cardiología, Hospital General de Agudos ‘Dr. José María Ramos Mejía’, Buenos Aires, Argentina
| | - Miriam Postan
- Instituto Nacional de Parasitología ‘Dr. Mario Fatala Chabén’/ANLIS/Malbrán, Buenos Aires, Argentina
| | - Mariela N. González
- Instituto Nacional de Parasitología ‘Dr. Mario Fatala Chabén’/ANLIS/Malbrán, Buenos Aires, Argentina
| | - Valentina Martín
- Laboratorio de Inmunología, Centro de Salud y Medio Ambiente (CESyMA), Escuela de Ciencia y Tecnología (ECyT), Universidad Nacional de San Martín, Buenos Aires, Argentina
| | - Ricardo S. Corral
- Servicio de Parasitología-Chagas, Hospital de Niños ‘Dr. Ricardo Gutiérrez’, Buenos Aires, Argentina
- * E-mail:
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Parasitic infections: a role for C-type lectins receptors. BIOMED RESEARCH INTERNATIONAL 2013; 2013:456352. [PMID: 23509724 PMCID: PMC3581113 DOI: 10.1155/2013/456352] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/09/2012] [Accepted: 10/12/2012] [Indexed: 02/04/2023]
Abstract
Antigen-presenting cells (APCs) sense the microenvironment through several types of receptors that recognize pathogen-associated molecular patterns. In particular, C-type lectins receptors (CLRs), which are expressed by distinct subsets of dendritic cells (DCs) and macrophages (MØs), recognize and internalize specific carbohydrate antigens in a Ca2+-dependent manner. The targeting of these receptors is becoming an efficient strategy for parasite recognition. However, relatively little is known about how CLRs are involved in both pathogen recognition and the internalization of parasites. The role of CLRs in parasite infections is an area of considerable interest because this research will impact our understanding of the initiation of innate immune responses, which influences the outcome of specific immune responses. This paper attempts to summarize our understanding of the effects of parasites' interactions with CLRs.
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Trypanosoma cruzi activates cord blood myeloid dendritic cells independently of cell infection. Med Microbiol Immunol 2012; 201:287-96. [PMID: 22327272 DOI: 10.1007/s00430-012-0230-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2011] [Accepted: 01/25/2012] [Indexed: 10/28/2022]
Abstract
We recently showed that T. cruzi parasites enhance expression of co-stimulatory surface molecules on cord blood myeloid dendritic cells (mDCs). This study aims to gain insight into the role of live parasites and intracellular infection in mDC activation using CSFE-labelled parasites. First, we observed that only a low proportion of mDCs was infected by T. cruzi after overnight culture of whole blood samples and trypomastigotes, as compared with monocytes and granulocytes. Cord blood mDCs were also less infected than their adult counterpart. Second, expression levels of HLA-DR and co-stimulatory molecules CD80, CD83 and CD86 were similar on infected and uninfected mDCs. Parasite lysate also triggered mDCs phenotypic maturation of both cord and adult blood cells, though in a lower extent than live parasites. These results strongly support a central role for extracellular trypomastigotes in activation of mDCs when parasites are incubated with whole blood cells. However, viability of trypomastigotes was not absolutely required for mDC activation.
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