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Mota LAM, Roberto Neto J, Monteiro VG, Lobato CSS, Oliveira MAD, Cunha MD, D'Ávila H, Seabra SH, Bozza PT, DaMatta RA. Culture of mouse peritoneal macrophages with mouse serum induces lipid bodies that associate with the parasitophorous vacuole and decrease their microbicidal capacity against Toxoplasma gondii. Mem Inst Oswaldo Cruz 2014; 109:767-74. [PMID: 25317704 PMCID: PMC4238769 DOI: 10.1590/0074-0276140119] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2014] [Accepted: 06/26/2014] [Indexed: 11/22/2022] Open
Abstract
Lipid bodies [lipid droplets (LBs)] are lipid-rich organelles involved in lipid metabolism, signalling and inflammation. Recent findings suggest a role for LBs in host response to infection; however, the potential functions of this organelle in Toxoplasma gondii infection and how it alters macrophage microbicidal capacity during infection are not well understood. Here, we investigated the role of host LBs in T. gondii infection in mouse peritoneal macrophages in vitro. Macrophages cultured with mouse serum (MS) had higher numbers of LBs than those cultured in foetal bovine serum and can function as a model to study the role of LBs during intracellular pathogen infection. LBs were found in association with the parasitophorous vacuole, suggesting that T. gondii may benefit from this lipid source. Moreover, increased numbers of macrophage LBs correlated with high prostaglandin E2 (PGE2) production and decreased nitric oxide (NO) synthesis. Accordingly, LB-enriched macrophages cultured with MS were less efficient at controlling T. gondii growth. Treatment of macrophages cultured with MS with indomethacin, an inhibitor of PGE2 production, increased the microbicidal capacity against T. gondii. Collectively, these results suggest that culture with MS caused a decrease in microbicidal activity of macrophages against T. gondii by increasing PGE2 while lowering NO production.
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Affiliation(s)
- Laura Azeredo Miranda Mota
- Laboratório de Biologia Celular e Tecidual, Universidade Estadual do Norte Fluminense, Campos dos Goytacazes, RJ, Brasil
| | - João Roberto Neto
- Laboratório de Biologia Celular e Tecidual, Universidade Estadual do Norte Fluminense, Campos dos Goytacazes, RJ, Brasil
| | - Verônica Gomes Monteiro
- Laboratório de Biologia Celular e Tecidual, Universidade Estadual do Norte Fluminense, Campos dos Goytacazes, RJ, Brasil
| | - Caroliny Samary Silva Lobato
- Laboratório de Biologia Celular e Tecidual, Universidade Estadual do Norte Fluminense, Campos dos Goytacazes, RJ, Brasil
| | - Marco Antonio de Oliveira
- Laboratório de Biologia Celular e Tecidual, Universidade Estadual do Norte Fluminense, Campos dos Goytacazes, RJ, Brasil
| | - Maura da Cunha
- Laboratório de Biologia Celular e Tecidual, Universidade Estadual do Norte Fluminense, Campos dos Goytacazes, RJ, Brasil
| | - Heloisa D'Ávila
- Laboratório de Imunofarmacologia, Fundação Oswaldo Cruz, Rio de Janeiro, RJ, Brasil
| | - Sérgio Henrique Seabra
- Laboratório de Tecnologia em Bioquímica e Microscopia, Centro Universitário Estadual da Zona Oeste, Rio de Janeiro, RJ, Brasil
| | | | - Renato Augusto DaMatta
- Laboratório de Biologia Celular e Tecidual, Universidade Estadual do Norte Fluminense, Campos dos Goytacazes, RJ, Brasil
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Lustgarten J, Eshhar Z. Specific elimination of IgE production using T cell lines expressing chimeric T cell receptor genes. Eur J Immunol 1995; 25:2985-91. [PMID: 7589102 DOI: 10.1002/eji.1830251041] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
B cells that are destined to secrete IgE express a membrane-bound form of IgE (mIgE) on their cell surface. Thus, elimination of such mIgE-positive cells should result in the suppression of IgE production, thereby alleviating the symptoms of IgE-mediated allergy. In this study, we examined, in a model system, whether IgE-specific effector T cells can be used specifically to eradicate IgE-producing B cells. To this end, we endowed T cells with anti-IgE specificity using chimeric T cell receptors (cTCR) containing the variable region domain (Fv) of the 84.1c non-anaphylactic anti-mouse IgE monoclonal antibody (mAb). Two configurations of chimeric receptor were used: in the first, we combined the heavy and light variable region chains of 84.1c with the constant (C) regions of the TCR alpha and beta chains. The second construct consisted of a chimeric single-chain receptor (scFvR), composed of a single-chain Fv region of the 84.1c antibody and the C beta domain of the TCR. Following transfection of the cTCR or the scFvR genes into the murine MD.45 cytotoxic T cell hybridoma or the Jurkat human T cell line, functional expression of IgE-specific chimeric receptors was detected on the cell surface. The transfected cells secreted interleukin-2 upon stimulation with immobilized IgE or fixed IgE-producing hybridoma cells. Moreover, cytotoxic T cell hybridomas expressing the chimeric receptor genes specifically eliminated IgE-secreting B cells in vitro, resulting in isotype-specific suppression of IgE production.
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MESH Headings
- Animals
- Antibodies, Anti-Idiotypic/genetics
- Antibodies, Anti-Idiotypic/immunology
- Antibodies, Monoclonal/genetics
- Antibodies, Monoclonal/immunology
- B-Lymphocyte Subsets/immunology
- Clonal Deletion
- Cricetinae
- Humans
- Hybridomas/immunology
- Hypersensitivity, Immediate/immunology
- Hypersensitivity, Immediate/prevention & control
- Immunoglobulin E/biosynthesis
- Immunoglobulin Fragments/genetics
- Immunoglobulin Fragments/immunology
- Immunoglobulin G/biosynthesis
- Interleukin-2/immunology
- Interleukin-4/pharmacology
- Leukemia-Lymphoma, Adult T-Cell/pathology
- Lipopolysaccharides/pharmacology
- Lymphocyte Activation
- Mice
- Mice, Inbred BALB C
- Receptors, Antigen, B-Cell/biosynthesis
- Receptors, Antigen, T-Cell, alpha-beta/genetics
- Receptors, Antigen, T-Cell, alpha-beta/immunology
- Recombinant Fusion Proteins/immunology
- T-Lymphocyte Subsets/immunology
- T-Lymphocyte Subsets/metabolism
- T-Lymphocytes, Regulatory/immunology
- Transfection
- Tumor Cells, Cultured
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Affiliation(s)
- J Lustgarten
- Department of Chemical Immunology, Weizmann Institute of Science, Rehovot, Israel
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