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Soares AKDA, Neves PAF, Cavalcanti MDGADM, Marinho SM, Oliveira WD, Souza JRD, Lorena VMBD, Gomes YDM. Expression of co-stimulatory molecules CD80 and CD86 is altered in CD14 + HLA-DR + monocytes from patients with Chagas disease following induction by Trypanosoma cruzi recombinant antigens. Rev Soc Bras Med Trop 2016; 49:632-636. [PMID: 27812661 DOI: 10.1590/0037-8682-0149-2016] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2016] [Accepted: 07/22/2016] [Indexed: 11/22/2022] Open
Abstract
INTRODUCTION The relationships between monocytes and lymphocytes through MHC class II molecules and costimulatory, are of utmost importance for the production of an efficient immune response. In this work, we assessed the expression of surface molecules CD80 and CD86 on CD14+HLA-DR+ monocytes from patients with Chagas disease. METHODS: The study population consisted of 31 patients with chronic clinical forms of Chagas disease. Patient blood samples were cultured in the presence of recombinant cytoplasmic repetitive antigen (CRA) and flagellar repetitive antigen (FRA). RESULTS: We found considerable differences in the expression profile of surface molecules involved in antigen presentation. CONCLUSIONS: CRA and FRA may contribute to host immune response evasion by Trypanozoma cruzi.
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Affiliation(s)
| | | | - Maria da Glória Aureliano de Melo Cavalcanti
- Pronto-Socorro Cardiológico de Pernambuco (PROCAPE) - Universidade de Pernambuco, Recife Pernambuco, Brazil.,Programa Integrado de Doença de Chagas, Fundação Oswaldo Cruz, Rio de Janeiro, Rio de Janeiro, Brazil
| | - Sílvia Martins Marinho
- Pronto-Socorro Cardiológico de Pernambuco (PROCAPE) - Universidade de Pernambuco, Recife Pernambuco, Brazil.,Programa Integrado de Doença de Chagas, Fundação Oswaldo Cruz, Rio de Janeiro, Rio de Janeiro, Brazil
| | - Wilson de Oliveira
- Pronto-Socorro Cardiológico de Pernambuco (PROCAPE) - Universidade de Pernambuco, Recife Pernambuco, Brazil.,Programa Integrado de Doença de Chagas, Fundação Oswaldo Cruz, Rio de Janeiro, Rio de Janeiro, Brazil
| | - Joelma Rodrigues de Souza
- Departamento de Fisiologia e Patologia, Universidade Federal da Paraíba, João Pessoa, Paraíba, Brazil
| | - Virginia Maria Barros de Lorena
- Centro de Pesquisas Aggeu Magalhães, Fundação Oswaldo Cruz, Recife, Pernambuco, Brazil.,Programa Integrado de Doença de Chagas, Fundação Oswaldo Cruz, Rio de Janeiro, Rio de Janeiro, Brazil
| | - Yara de Miranda Gomes
- Centro de Pesquisas Aggeu Magalhães, Fundação Oswaldo Cruz, Recife, Pernambuco, Brazil.,Programa Integrado de Doença de Chagas, Fundação Oswaldo Cruz, Rio de Janeiro, Rio de Janeiro, Brazil
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Bottino CG, Gomes LP, Pereira JB, Coura JR, Provance DW, De-Simone SG. Chagas disease-specific antigens: characterization of epitopes in CRA/FRA by synthetic peptide mapping and evaluation by ELISA-peptide assay. BMC Infect Dis 2013; 13:568. [PMID: 24299278 PMCID: PMC3890492 DOI: 10.1186/1471-2334-13-568] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2013] [Accepted: 11/08/2013] [Indexed: 11/23/2022] Open
Abstract
Background The identification of epitopes in proteins recognized by medically relevant antibodies is useful for the development of peptide-based diagnostics and vaccines. In this study, epitopes in the cytoplasmic repetitive antigen (CRA) and flagellar repetitive antigen (FRA) proteins from Trypanosoma cruzi were identified using synthetic peptide techniques and pooled sera from Chagasic patients. The epitopes were further assayed with an ELISA assay based on synthetic peptides. Methods Twenty-two overlapping synthetic peptides representing the coding sequence of the T. cruzi CRA and FRA proteins were assessed by a Spot-synthesis array analysis using sera donated by patients with Chagas disease. Shorter peptides were selected that represented the determined epitopes and synthesized by solid phase synthesis to evaluate the patterns of cross-reactivities and discrimination through an ELISA-diagnostic assay. Results The peptide Spot-synthesis array successfully identified two IgG antigenic determinants in the CRA protein and four in FRA. Bioinformatics suggested that the CRA antigens were unique to T. cruzi while the FRA antigen showed similarity with sequences present within various proteins from Leishmania sp. Subsequently, shorter peptides representing the CRA-1, CRA-2 and FRA-1 epitopes were synthesized by solid phase synthesis and assayed by an ELISA-diagnostic assay. The CRA antigens gave a high discrimination between Chagasic, Leishmaniasis and T. cruzi-uninfected serum. A sensitivity and specificity of 100% was calculated for CRA. While the FRA antigen showed a slightly lower sensitivity (91.6%), its specificity was only 60%. Conclusions The epitopes recognized by human anti-T. cruzi antibodies have been precisely located in two biomarkers of T. cruzi, CRA and FRA. The results from screening a panel of patient sera through an ELISA assay based on peptides representing these epitopes strongly suggest that the sequences from CRA would be useful for the development of diagnostic reagents that could improve upon the sensitivity and specificity of currently available diagnostic tests. Overall, the results provide further evidence of the usefulness of identifying specific linear B-cell epitopes for improving diagnostic tools.
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Affiliation(s)
| | | | | | | | | | - Salvatore G De-Simone
- Centro de Desenvolvimento Tecnológico em Saúde (CDTS)/Instituto Nacional de Ciência e Tecnologia de Inovação em Doenças Negligenciadas (INCT-IDN), Fundação Oswaldo Cruz, Rio de Janeiro, RJ, Brazil.
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Lorena VMB, Verçosa AFA, Machado RCA, Moitinho-Silva L, Cavalcanti MGA, Silva ED, Ferreira AGP, Correa-Oliveira R, Pereira VRA, Gomes YM. Cellular immune response from Chagasic patients to CRA or FRA recombinant antigens of Trypanosoma cruzi. J Clin Lab Anal 2008; 22:91-8. [PMID: 18348314 DOI: 10.1002/jcla.20209] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
We propose to analyze the relation between the cellular immune response of Chagas' disease patients after in vitro stimulation of peripheral blood mononuclear cells (PBMC) with recombinant antigens cytoplasmatic repetitive antigen (CRA) or flagellar repetitive antigen (FRA) of T. cruzi and the chronic clinical forms of disease. Cells were stimulated using phytohemagglutinin, CRA, FRA, or a soluble antigen of Epimastigota (Ag-Epi) for 24 hr, 72 hr, or 6 days. The proliferation of cells was evaluated after 6 days of culture by quantification of incorporated 3H-thymidine. Cytokines were measured in the supernatants obtained after 24 hr (tumor necrosis factor [TNF]-alpha and interleukin [IL]-4), 72 hr (IL-10), and 6 days (interferon [IFN]-gamma) using enzyme-linked immunosorbent assay (ELISA). Cells of the Chagas patients stimulated with the recombinant antigens exhibited higher proliferation responses compared with that of non-Chagas (NC) individuals. However, when proliferation was compared between patients with the cardiac form (CF) or indeterminate form (IF), it was not possible to establish a difference in the response. So far as the cytokines secreted in the culture supernatants after stimulation in vitro with T. cruzi antigens were concerned, the results showed that CRA, as well as Epi-Ag, were able to stimulate the production of TNF-alpha and IFN-gamma in Chagas patients as compared with NC individuals. However, the cytokine levels after stimulation with the T. cruzi antigens were not different between the patients with CF and IF. CRA was capable of inducing a T helper type 1 (Th1) immune response, with elevated production of TNF-alpha and IFN-gamma in Chagas patients that are carriers of CF and IF clinical forms.
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Affiliation(s)
- Virginia M B Lorena
- Departamento de Imunologia, Centro de Pesquisas Aggeu Magalhães/Fiocruz, Recife-PE, Brazil
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Verçosa A, Lorena V, Carvalho C, Melo M, Cavalcanti M, Silva E, Ferreira A, Pereira V, Souza W, Gomes Y. Chagas' disease: IgG isotypes against cytoplasmic (CRA) and flagellar (FRA) recombinant repetitive antigens of Trypanosoma cruzi in chronic Chagasic patients. J Clin Lab Anal 2007; 21:271-6. [PMID: 17847109 PMCID: PMC6649189 DOI: 10.1002/jcla.20186] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
The wide range of clinical Chagas' disease manifestations, of which heart involvement is the most significant, because of its characteristics, frequency and consequences, and lack of treatment and cure, justify research in this area. Specific immunoglobulin G (IgG) antibody subclasses have been associated with human Chagas' disease. Thus, in this study, the profile of IgG subclasses against cytoplasmic (CRA) and flagellar (FRA) recombinant repetitive T. cruzi-specific antigens was correlated with cardiac (CARD, n=33), cardiodigestive (CD, n=7), and indeterminate (IND, n=20) forms of Chagas' disease by indirect enzyme-linked immunosorbent assay (ELISA). IgG subclasses were detected in almost all Chagas patients studied. Nevertheless, only specific IgG2 isotype FRA was found with a significant statistical difference in CARD patients when compared to IND patients. This result suggests the potential use of this isotype for prognostic purposes, for monitoring the progression of chronic Chagas' disease, and for predicting the risk of CARD damage. This is important information, as it could help physicians to evaluate and manage the treatment of their patients. However, a follow-up study is necessary to confirm our result.
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Affiliation(s)
- A.F.A. Verçosa
- Centro de Pesquisas Aggeu Magalhães (CPqAM)/Fiocruz, Recife‐PE, Brazil
| | - V.M.B. Lorena
- Centro de Pesquisas Aggeu Magalhães (CPqAM)/Fiocruz, Recife‐PE, Brazil
| | - C.L. Carvalho
- Centro de Pesquisas Aggeu Magalhães (CPqAM)/Fiocruz, Recife‐PE, Brazil
| | - M.F.A.D. Melo
- Centro de Pesquisas Aggeu Magalhães (CPqAM)/Fiocruz, Recife‐PE, Brazil
| | - M.G.A. Cavalcanti
- Hospital Oswaldo Cruz (HUOC)/Universidade de Pernambuco (UPE), Recife‐PE, Brazil
| | - E.D. Silva
- Bio‐Manguinhos/Fiocruz, Rio de Janeiro‐RJ, Brazil
| | | | - V.R.A. Pereira
- Centro de Pesquisas Aggeu Magalhães (CPqAM)/Fiocruz, Recife‐PE, Brazil
| | - W.V. Souza
- Centro de Pesquisas Aggeu Magalhães (CPqAM)/Fiocruz, Recife‐PE, Brazil
| | - Y.M. Gomes
- Centro de Pesquisas Aggeu Magalhães (CPqAM)/Fiocruz, Recife‐PE, Brazil
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Rocha GM, Brandão BA, Mortara RA, Attias M, de Souza W, Carvalho TMU. The flagellar attachment zone of Trypanosoma cruzi epimastigote forms. J Struct Biol 2006; 154:89-99. [PMID: 16414276 DOI: 10.1016/j.jsb.2005.11.008] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2005] [Revised: 11/16/2005] [Accepted: 11/22/2005] [Indexed: 10/25/2022]
Abstract
The flagellar attachment zone (FAZ) is an adhesion region of Trypanosoma cruzi epimastigote forms where the flagellum emerges from the flagellar pocket and remains attached to the cell body. This region shows a junctional complex which is formed by a linear series of apposed macular structures that are separated by amorphous material and clusters of intramembranous particles. Two protein groups appear to be important in the FAZ region: a membrane glycoprotein of 72kDa and several high molecular weight proteins. To gain a better understanding of the FAZ region, we compared wild-type Y strain T. cruzi epimastigotes with a mutant cell in which the 72-kDa surface glycoprotein (Gp72), involved in cell body-flagellum adhesion, had been deleted by target gene replacement. Using immunofluorescence confocal microscopy and electron microscopy techniques to analyze the FAZ region the results suggest that, in the absence of Gp72, other proteins involved in the formation of FAZ remain concentrated in the flagellar pocket region. The analysis of a 3-D reconstruction model of wild-type epimastigotes showed that the endoplasmic reticulum and mitochondrion are in intimate association with FAZ, in contrast to the null mutant cells where the endoplasmic reticulum was not visualized.
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Affiliation(s)
- Gustavo Miranda Rocha
- Laboratório de Ultraestrutura Celular Hertha Meyer, Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, CCS, Bloco G, llha do Fundão, Rio de Janeiro, RJ 21949-900, Brazil
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Pereira VRA, Lorena VMB, Da Silva APG, Coutinho EM, Silvas ED, Ferreira AGP, Miranda P, Krieger MA, Goldenberg S, Soares MBP, Correa-Oliveira R, Gomes YM. Immunization with cytoplasmic repetitive antigen and flagellar repetitive antigen of Trypanosoma cruzi stimulates a cellular immune response in mice. Parasitology 2005; 129:563-70. [PMID: 15552401 DOI: 10.1017/s0031182004006043] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
In previous studies, we demonstrated that CRA and FRA recombinant proteins, used for diagnosis of Chagas' disease, elicited a humoral immune response in susceptible and resistant mice. To understand better the immune response to these proteins, we have evaluated, the cellular immune response in CRA- and in FRA-immunized BALB/c and C57BL/6 mice. A specific cellular lymphoproliferative response was observed in both strains of mice. Spleen cell cultures mainly from CRA-immunized C57BL/6 and FRA-immunized BALB/c mice produced high levels of IFN-y, indicating the induction of a Type 1 immune response. Regarding the T cell subsets, CD4+ T cells were the major source of IFN-y in CRA- and FRA-immunized mice. These results suggest that CRA and FRA are important immunogens in inducing a Type 1 immune response and that they may be considered as potential vaccine antigens.
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Affiliation(s)
- V R A Pereira
- Centro de Pesquisas Aggeu Magalhães/FIOCRUZ, Recife, PE, Brazil
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Pereira VRA, Lorena VMB, Nakazawa M, Luna CF, Silva ED, Ferreira AGP, Krieger MA, Goldenberg S, Soares MBP, Coutinho EM, Correa-Oliveira R, Gomes YM. Humoral and cellular immune responses in BALB/c and C57BL/6 mice immunized with cytoplasmic (CRA) and flagellar (FRA) recombinant repetitive antigens, in acute experimental Trypanosoma cruzi infection. Parasitol Res 2005; 96:154-61. [PMID: 15856302 DOI: 10.1007/s00436-005-1336-4] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2005] [Accepted: 02/24/2005] [Indexed: 01/23/2023]
Abstract
In previous studies, cytoplasmic repetitive antigen (CRA) and flagellar repetitive antigen (FRA) proteins induced specific humoral and cellular immune responses in susceptible and resistant mice in the absence of Trypanosoma cruzi infection with a significant induction of the Interferon-gamma (IFN-gamma) production in those animals. In this follow-up paper, the immunostimulatory and protective effects of these proteins were evaluated by immunizing with CRA or FRA antigens, BALB/c and C57BL/6 mice and challenging with a T. cruzi (Y strain). Both proteins induced humoral response with high levels of IgG isotypes as well as cellular immunity with high levels of IFN-gamma when compared to controls. However, the lymphocyte proliferative response was minimal. The survival rate at 30 days post-infection was significant in CRA (60%) or FRA (50%)--immunized BALB/c mice and CRA (83.3%)--immunized C57BL/6 mice. Taken as a whole these findings indicate that CRA and FRA are immunogenic and potentially important for protective immunity.
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