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Arruda IR, Souza MP, Soares PA, Albuquerque PB, Silva TD, Medeiros PL, Silva MV, Correia MT, Vicente AA, Carneiro-da-Cunha MG. Xyloglucan and Concanavalin A based dressings in the topical treatment of mice wound healing process. CARBOHYDRATE POLYMER TECHNOLOGIES AND APPLICATIONS 2021. [DOI: 10.1016/j.carpta.2021.100136] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
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2
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Cardoso da Silva CD, Lagos de Melo CM, Matoso Maciel Carvalho EV, Lino da Silva MA, Bezerra RF, Guerra Dos Santos AJ, Alves Pereira VR, Breitenbach Barroso Coelho LC. Proliferative Effect of Tilapia Fish (Oreochromis niloticus) Lectin on BALB/c Mice Splenocytes. Protein Pept Lett 2019; 26:887-892. [PMID: 31544688 DOI: 10.2174/0929866526666190911144057] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2018] [Revised: 07/10/2019] [Accepted: 08/02/2019] [Indexed: 11/22/2022]
Abstract
BACKGROUND Lectins have been studied in recent years due to their immunomodulatory activities. OBJECTIVE We purified a lectin named OniL from tilapia fish (Oreochromis niloticus) and here we analyzed the cell proliferation and cytokine production in Balb/c mice splenocytes. METHODS Cells were stimulated in vitro in 24, 48, 72 hours and 6 days with different concentrations of OniL and Con A. Evaluation of cell proliferation was performed through [3H]-thymidine incorporation, cytokines were investigated using ELISA assay and cell viability assay was performed by investigation of damage through signals of apoptosis and necrosis. RESULTS OniL did not promote significant cell death, induced high mitogenic activity in relation to control and Con A and stimulated the cells to release high IL-2 and IL-6 cytokines. CONCLUSION These findings suggest that, like Con A, OniL lectin can be used as a mitogenic agent in immunostimulatory assays.
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Affiliation(s)
| | | | | | - Mércia Andréa Lino da Silva
- Departamento de Bioquímica, Centro de Biociências, Universidade Federal de Pernambuco, Recife, Pernambuco, Brazil
| | - Rosiely Félix Bezerra
- Departamento de Bioquímica, Centro de Biociências, Universidade Federal de Pernambuco, Recife, Pernambuco, Brazil
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de Oliveira SA, de Oliveira Barbosa M, Filho CALM, Oliveira AR, de Sousa FA, de Farias Santiago E, de Oliveira Filho GB, de Moraes Gomes PAT, da Conceição JM, Brayner FA, Alves LC, Leite ACL. Phthalimido-thiazole as privileged scaffold: activity against immature and adult worms of Schistosoma mansoni. Parasitol Res 2018; 117:2105-2115. [DOI: 10.1007/s00436-018-5897-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2018] [Accepted: 04/25/2018] [Indexed: 12/26/2022]
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Evaluation of the anti-Schistosoma mansoni activity of thiosemicarbazones and thiazoles. Antimicrob Agents Chemother 2013; 58:352-63. [PMID: 24165185 DOI: 10.1128/aac.01900-13] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Schistosomiasis is a chronic and debilitating disease caused by a trematode of the genus Schistosoma and affects over 207 million people. Chemotherapy is the only immediate recourse for minimizing the prevalence of this disease and involves predominately the administration of a single drug, praziquantel (PZQ). Although PZQ has proven efficacy, there is a recognized need to develop new drugs as schistosomicides since studies have shown that repeated use of this drug in areas of endemicity may cause a temporary reduction in susceptibility in isolates of Schistosoma mansoni. Hydrazones, thiosemicarbazones, phthalimides, and thiazoles are thus regarded as privileged structures used for a broad spectrum of activities and are potential candidates for sources of new drug prototypes. The present study determined the in vitro schistosomicidal activity of 10 molecules containing these structures. During the assays, parameters such motility and mortality, oviposition, morphological changes in the tegument, cytotoxicity, and immunomodulatory activity caused by these compounds were evaluated. The results showed that compounds formed of thiazole and phthalimide led to higher mortality of worms, with a significant decline in motility, inhibition of pairing and oviposition, and a mortality rate of 100% starting from 144 h of exposure. These compounds also stimulated the production of nitric oxide and tumor necrosis factor alpha (TNF-α), thereby demonstrating the presence of immunomodulatory activity. The phthalyl thiazole LpQM-45 caused significant ultrastructural alterations, with destruction of the tegument in both male and female worms. According to the present study, phthalyl thiazole compounds possess antischistosomal activities and should form the basis for future experimental and clinical trials.
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Evaluation of antioxidant, immunomodulatory, and cytotoxic action of fractions from Eugenia uniflora L. and Eugenia malaccensis L.: correlation with polyphenol and flavanoid content. ScientificWorldJournal 2013; 2013:125027. [PMID: 24089599 PMCID: PMC3780708 DOI: 10.1155/2013/125027] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2013] [Accepted: 06/29/2013] [Indexed: 11/18/2022] Open
Abstract
An increasing number of biological activities presented by medicinal plants has been investigated over the years, and they are used in the search for new substances with lower side effects. Eugenia uniflora L. and Eugenia malaccensis L. (Myrtaceae) have many folk uses in various countries. This current study was designed to quantify the polyphenols and flavonoids contents and evaluate the immunomodulatory, antioxidant, and cytotoxic potentials of fractions from E. uniflora L. and E. malaccensis L. It was observed that the polyphenol content was higher in ethyl acetate fractions. These fractions have high antioxidant potential. E. malaccensis L. seeds showed the largest DPPH radical scavenger capacity (EC50 = 22.62). The fractions of E. malaccensis L. leaves showed lower antioxidant capacity. The samples did not alter the profile of proinflammatory cytokines and nitric oxide release. The results indicate that species of the family Myrtaceae are rich in compounds with antioxidant capacity, which can help reduce the inflammatory response.
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Coriolano MC, de Melo CML, Santos AJG, Pereira VRA, Coelho LCBB. Rachycentron canadum (cobia) lectin promoted mitogenic response in mice BALB/c splenocytes. Scand J Immunol 2013; 76:567-72. [PMID: 22946764 DOI: 10.1111/j.1365-3083.2012.02774.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The mitogenic lectins are invaluable tools to study the biochemical changes associated with lymphocyte activation and proliferation of various immune cells. Rachycentron canadum lectin (RcaL) was detected and purified from serum of cobia fish. The aim of this study was to evaluate the proliferative response and cytokine production in splenocytes of mice in vitro stimulated with RcaL lectin; Canavalia ensiformis lectin (Con A) was used as positive control. A high proliferation index was induced by RcaL in relation to control cells. Furthermore, RcaL induced higher IL-2 and IL-6 production in relation to control. The cell viability was 90% in splenocytes treated with RcaL lectin, but RcaL promoted significant late apoptosis after 24 and 48 h in relation to control. RcaL induced proliferative responses suggesting that this lectin can be used as a mitogenic agent in immunostimulatory assays.
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Affiliation(s)
- M C Coriolano
- Departamento de Bioquímica, Laboratório de Glicoproteínas da Universidade Federal de Pernambuco-UFPE, Recife, Brazil
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7
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Immunomodulatory response of mice splenocytes induced by RcaL, a lectin isolated from cobia fish (Rachycentron canadum) serum. Appl Biochem Biotechnol 2012; 168:1335-48. [PMID: 22941310 DOI: 10.1007/s12010-012-9861-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2012] [Accepted: 08/21/2012] [Indexed: 01/05/2023]
Abstract
This work reports the isolation of a serum lectin from cobia fish (Rachycentron canadum) named RcaL. Immunomodulatory activity on mice splenocyte experimental cultures through cytotoxic assays and cytokine production were also performed. RcaL was obtained through precipitation with ammonium sulphate and affinity chromatography on a Concanavalin A-Sepharose 4B column. The ammonium sulphate fraction F3 showed the highest specific hemagglutinating activity and was applied to affinity chromatography. The lectin was eluted with methyl-α-D-mannopyranoside. RcaL showed highest affinity for methyl-α-D-mannopyranoside and D-mannose; eluted fractions of RcaL agglutinated rabbit erythrocytes (titre, 128(-1)) retained 66 % of chromatographed lectin activity, and the obtained purification factor was 1.14. Under reducing conditions, a polypeptide band of 19.2 kDa was revealed in sodium dodecyl sulphate polyacrylamide gel electrophoresis (PAGE). PAGE confirmed RcaL as an acidic protein revealed in a single band. Cytotoxic and immunomodulatory assays with RcaL in mice splenocyte cultures showed that the lectin was not cytotoxic and induced higher interferon gamma and nitric oxide production in splenocyte cultures. Purified RcaL induced preferential Th1 response, suggesting that it acts as an immunomodulatory compound.
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da Silva CDC, Coriolano MC, da Silva Lino MA, de Melo CML, de Souza Bezerra R, de Carvalho EVMM, Dos Santos AJG, Pereira VRA, Coelho LCBB. Purification and characterization of a mannose recognition lectin from Oreochromis niloticus (tilapia fish): cytokine production in mice splenocytes. Appl Biochem Biotechnol 2011; 166:424-35. [PMID: 22081327 DOI: 10.1007/s12010-011-9438-1] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2011] [Accepted: 10/26/2011] [Indexed: 01/17/2023]
Abstract
The aim of this work was to purify and partially characterize a mannose recognition lectin from Nile tilapia (Oreochromis niloticus) serum, named OniL. OniL was isolated through precipitation with ammonium sulfate and affinity chromatography (Concanavalin A-Sepharose 4B). In addition, we evaluated carbohydrate specificity, sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) profiles, and in vitro immunomodulatory activity on mice splenocyte experimental cultures through cytotoxic assays and cytokine production. The ammonium sulfate fraction F2 showed the highest specific hemagglutinating activity (331) and was applied to affinity matrix. Adsorbed proteins (OniL) were eluted with methyl-α-D: -mannopyranoside. OniL, a 17-kDa protein by SDS-PAGE constituted by subunits of 11 and 6.6 kDa, showed highest affinity for methyl-α-D: -mannopyranoside and D: -mannose. Immunological assays, in vitro, showed that OniL did not show cytotoxicity against splenocytes, induced higher IFN-γ production and lower IL-10 as well as nitrite release. In conclusion, OniL lectin was successfully purified and showed a preferential Th1 response in mice splenocytes.
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Affiliation(s)
- Cynarha Daysy Cardoso da Silva
- Departamento de Bioquímica, Laboratório de Glicoproteínas, Universidade Federal de Pernambuco/UFPE, Av. Prof. Moraes Rego s/n, Cidade Universitária, CEP 50670-420, Recife, Pernambuco, Brazil
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Galetović A, Souza RT, Santos MRM, Cordero EM, Bastos IMD, Santana JM, Ruiz JC, Lima FM, Marini MM, Mortara RA, da Silveira JF. The repetitive cytoskeletal protein H49 of Trypanosoma cruzi is a calpain-like protein located at the flagellum attachment zone. PLoS One 2011; 6:e27634. [PMID: 22096606 PMCID: PMC3214072 DOI: 10.1371/journal.pone.0027634] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2011] [Accepted: 10/20/2011] [Indexed: 12/27/2022] Open
Abstract
Background Trypanosoma cruzi has a single flagellum attached to the cell body by a network of specialized cytoskeletal and membranous connections called the flagellum attachment zone. Previously, we isolated a DNA fragment (clone H49) which encodes tandemly arranged repeats of 68 amino acids associated with a high molecular weight cytoskeletal protein. In the current study, the genomic complexity of H49 and its relationships to the T. cruzi calpain-like cysteine peptidase family, comprising active calpains and calpain-like proteins, is addressed. Immunofluorescence analysis and biochemical fractionation were used to demonstrate the cellular location of H49 proteins. Methods and Findings All of H49 repeats are associated with calpain-like sequences. Sequence analysis demonstrated that this protein, now termed H49/calpain, consists of an amino-terminal catalytic cysteine protease domain II, followed by a large region of 68-amino acid repeats tandemly arranged and a carboxy-terminal segment carrying the protease domains II and III. The H49/calpains can be classified as calpain-like proteins as the cysteine protease catalytic triad has been partially conserved in these proteins. The H49/calpains repeats share less than 60% identity with other calpain-like proteins in Leishmania and T. brucei, and there is no immunological cross reaction among them. It is suggested that the expansion of H49/calpain repeats only occurred in T. cruzi after separation of a T. cruzi ancestor from other trypanosomatid lineages. Immunofluorescence and immunoblotting experiments demonstrated that H49/calpain is located along the flagellum attachment zone adjacent to the cell body. Conclusions H49/calpain contains large central region composed of 68-amino acid repeats tandemly arranged. They can be classified as calpain-like proteins as the cysteine protease catalytic triad is partially conserved in these proteins. H49/calpains could have a structural role, namely that of ensuring that the cell body remains attached to the flagellum by connecting the subpellicular microtubule array to it.
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Affiliation(s)
- Alexandra Galetović
- Departamento de Microbiologia, Imunologia e Parasitologia, Escola Paulista de Medicina, Universidade Federal de São Paulo, São Paulo, São Paulo, Brasil
- Laboratorio de Bioquímica, Departamento Biomédico, Universidad de Antofagasta, Antofagasta, Chile
| | - Renata T. Souza
- Departamento de Microbiologia, Imunologia e Parasitologia, Escola Paulista de Medicina, Universidade Federal de São Paulo, São Paulo, São Paulo, Brasil
| | | | - Esteban M. Cordero
- Departamento de Microbiologia, Imunologia e Parasitologia, Escola Paulista de Medicina, Universidade Federal de São Paulo, São Paulo, São Paulo, Brasil
| | - Izabela M. D. Bastos
- Departamento de Biologia Celular, Instituto de Biologia, Universidade de Brasilia, Brasilia, Brasil
| | - Jaime M. Santana
- Departamento de Biologia Celular, Instituto de Biologia, Universidade de Brasilia, Brasilia, Brasil
| | - Jeronimo C. Ruiz
- Centro de Pesquisa René Rachou (CPqRR), FIOCRUZ, Belo Horizonte, Minas Gerais, Brasil
| | - Fabio M. Lima
- Departamento de Microbiologia, Imunologia e Parasitologia, Escola Paulista de Medicina, Universidade Federal de São Paulo, São Paulo, São Paulo, Brasil
| | - Marjorie M. Marini
- Departamento de Microbiologia, Imunologia e Parasitologia, Escola Paulista de Medicina, Universidade Federal de São Paulo, São Paulo, São Paulo, Brasil
| | - Renato A. Mortara
- Departamento de Microbiologia, Imunologia e Parasitologia, Escola Paulista de Medicina, Universidade Federal de São Paulo, São Paulo, São Paulo, Brasil
| | - José Franco da Silveira
- Departamento de Microbiologia, Imunologia e Parasitologia, Escola Paulista de Medicina, Universidade Federal de São Paulo, São Paulo, São Paulo, Brasil
- * E-mail:
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Neves JKAL, de Lima MDCA, Pereira VRA, de Melo CML, Peixoto CA, Pitta IDR, Albuquerque MCPA, Galdino SL. Antischistosomal action of thioxo-imidazolidine compounds: An ultrastructural and cytotoxicity study. Exp Parasitol 2011; 128:82-90. [PMID: 21315071 DOI: 10.1016/j.exppara.2011.01.021] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2010] [Revised: 01/19/2011] [Accepted: 01/25/2011] [Indexed: 11/18/2022]
Affiliation(s)
- Juliana Kelle A L Neves
- Laboratório de Planejamento e Síntese de Fármacos (LPSF), Departamento de Antibióticos, Centro de Ciências Biológicas, Universidade Federal de Pernambuco (UFPE), Av. Prof. Moraes Rego s/n, Cidade Universitária, Recife, PE, Brazil.
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11
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Lessa JA, Reis DC, Mendes IC, Speziali NL, Rocha LF, Pereira VR, Melo CM, Beraldo H. Antimony(III) complexes with pyridine-derived thiosemicarbazones: Structural studies and investigation on the antitrypanosomal activity. Polyhedron 2011. [DOI: 10.1016/j.poly.2010.11.004] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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12
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Reis DC, Pinto MCX, Souza-Fagundes EM, Rocha LF, Pereira VRA, Melo CML, Beraldo H. Investigation on the pharmacological profile of antimony(III) complexes with hydroxyquinoline derivatives: anti-trypanosomal activity and cytotoxicity against human leukemia cell lines. Biometals 2011; 24:595-601. [PMID: 21221718 DOI: 10.1007/s10534-011-9407-8] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2010] [Accepted: 01/02/2011] [Indexed: 10/18/2022]
Abstract
Complexes [Sb(QN)(2)Cl] (1), [Sb(QC)(2)Cl] (2) and [Sb(QI)(2)Cl] (3) were obtained with 8-hydroxyquinoline (HQN), 5-chloro-8-hydroxyquinoline (HQC) and 5-chloro-7-iodo-8-hydroxyquinoline (clioquinol, HQI). The quinoline derivatives and their antimony(III) complexes were evaluated for their anti-trypanosomal activity as well as for their cytotoxicity against HL-60 and Jurkat human leukemia cell lines. Upon coordination to antimony(III) the anti-trypanosomal activity of HQC and HQI increases, the highest improvement being observed for complex (3), which was the most active among all studied compounds against both epimastigote and trypomastigote forms of Trypanosoma cruzi. All quinoline derivatives proved to be cytotoxic against both leukemia cell lineages. Upon coordination to antimony(III) the cytotoxicity of HQN improved against Jurkat leukemia cells. While SbCl(3) proved to be cytotoxic against HL-60 cells, it was not active against Jurkat cells. However, its coordination to the quinoline derivatives resulted in complexes with significant cytotoxicity against Jurkat cells.
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Affiliation(s)
- Débora C Reis
- Departamento de Química, Universidade Federal de Minas Gerais, Belo Horizonte, MG 31270-901, Brazil
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Biological and immunological activity of new imidazolidines against adult worms of Schistosoma mansoni. Parasitol Res 2010; 107:531-8. [DOI: 10.1007/s00436-010-1886-y] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2010] [Accepted: 04/18/2010] [Indexed: 10/19/2022]
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14
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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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Chou B, Hisaeda H, Shen J, Duan X, Imai T, Tu L, Murata S, Tanaka K, Himeno K. Critical contribution of immunoproteasomes in the induction of protective immunity against Trypanosoma cruzi in mice vaccinated with a plasmid encoding a CTL epitope fused to green fluorescence protein. Microbes Infect 2007; 10:241-50. [PMID: 18321749 DOI: 10.1016/j.micinf.2007.11.010] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2007] [Revised: 10/30/2007] [Accepted: 11/24/2007] [Indexed: 11/17/2022]
Abstract
Acquired immunity against infection with Trypanosoma cruzi is dependent on CD8(+)T cells. Here, to develop a vaccine strategy taking advantage of activated CD8(+)T cells, we constructed a DNA vaccine, designated pGFP-TSA1, encoding a fusion protein linking GFP to a single CTL epitope of TSA1, a leading candidate for vaccine against T. cruzi. C57BL/6 mice vaccinated with this plasmid showed suppressed parasitemia and prolonged survival. Vaccination with pGFP-TSA1 enhanced epitope-specific cytotoxicity and IFN-gamma secretion by CD8(+)T cells. Furthermore, the depletion of CD8(+)T cells prior to challenge infection with T. cruzi completely abolished this protection, indicating that CD8(+)T cells are the principal effector T cells involved. When mice deficient in the proteasome activator PA28alpha/beta or the immunoproteasome subunits LMP2 and LMP7 were used, the protective immunity against infection was profoundly attenuated. Our findings clearly demonstrate that vaccination with pGFP-TSA1 successfully induces protection dependent on CD8(+)T cell activation, in which immunoproteasomes play a crucial role. It is noteworthy to document that physical binding of the epitope and GFP is required for induction of this protection, since mice vaccinated with pTSA1-IRES-GFP failed to acquire resistance, probably because the epitope and GFP are separately expressed in the antigen-presenting cells.
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Affiliation(s)
- Bin Chou
- Department of Parasitology, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
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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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