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Almeida-Silva J, Menezes DS, Fernandes JMP, Almeida MC, Vasco-Dos-Santos DR, Saraiva RM, Viçosa AL, Perez SAC, Andrade SG, Suarez-Fontes AM, Vannier-Santos MA. The repositioned drugs disulfiram/diethyldithiocarbamate combined to benznidazole: Searching for Chagas disease selective therapy, preventing toxicity and drug resistance. Front Cell Infect Microbiol 2022; 12:926699. [PMID: 35967878 PMCID: PMC9372510 DOI: 10.3389/fcimb.2022.926699] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2022] [Accepted: 06/27/2022] [Indexed: 12/20/2022] Open
Abstract
Chagas disease (CD) affects at least 6 million people in 21 South American countries besides several thousand in other nations all over the world. It is estimated that at least 14,000 people die every year of CD. Since vaccines are not available, chemotherapy remains of pivotal relevance. About 30% of the treated patients cannot complete the therapy because of severe adverse reactions. Thus, the search for novel drugs is required. Here we tested the benznidazole (BZ) combination with the repositioned drug disulfiram (DSF) and its derivative diethyldithiocarbamate (DETC) upon Trypanosoma cruzi in vitro and in vivo. DETC-BZ combination was synergistic diminishing epimastigote proliferation and enhancing selective indexes up to over 10-fold. DETC was effective upon amastigotes of the BZ- partially resistant Y and the BZ-resistant Colombiana strains. The combination reduced proliferation even using low concentrations (e.g., 2.5 µM). Scanning electron microscopy revealed membrane discontinuities and cell body volume reduction. Transmission electron microscopy revealed remarkable enlargement of endoplasmic reticulum cisternae besides, dilated mitochondria with decreased electron density and disorganized kinetoplast DNA. At advanced stages, the cytoplasm vacuolation apparently impaired compartmentation. The fluorescent probe H2-DCFDA indicates the increased production of reactive oxygen species associated with enhanced lipid peroxidation in parasites incubated with DETC. The biochemical measurement indicates the downmodulation of thiol expression. DETC inhibited superoxide dismutase activity on parasites was more pronounced than in infected mice. In order to approach the DETC effects on intracellular infection, peritoneal macrophages were infected with Colombiana trypomastigotes. DETC addition diminished parasite numbers and the DETC-BZ combination was effective, despite the low concentrations used. In the murine infection, the combination significantly enhanced animal survival, decreasing parasitemia over BZ. Histopathology revealed that low doses of BZ-treated animals presented myocardial amastigote, not observed in combination-treated animals. The picrosirius collagen staining showed reduced myocardial fibrosis. Aminotransferase de aspartate, Aminotransferase de alanine, Creatine kinase, and urea plasma levels demonstrated that the combination was non-toxic. As DSF and DETC can reduce the toxicity of other drugs and resistance phenotypes, such a combination may be safe and effective.
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Affiliation(s)
- Juliana Almeida-Silva
- Innovations in Therapies, Education and Bioproducts Laboratory, Oswaldo Cruz Institute, Oswaldo Cruz Foundation, Rio de Janeiro, RJ, Brazil
| | - Diego Silva Menezes
- Parasite Biology Laboratory, Gonçalo Moniz Institute, Oswaldo Cruz Foundation, Salvador, BA, Brazil
| | - Juan Mateus Pereira Fernandes
- Innovations in Therapies, Education and Bioproducts Laboratory, Oswaldo Cruz Institute, Oswaldo Cruz Foundation, Rio de Janeiro, RJ, Brazil
| | - Márcio Cerqueira Almeida
- Parasite Biology Laboratory, Gonçalo Moniz Institute, Oswaldo Cruz Foundation, Salvador, BA, Brazil
| | - Deyvison Rhuan Vasco-Dos-Santos
- Innovations in Therapies, Education and Bioproducts Laboratory, Oswaldo Cruz Institute, Oswaldo Cruz Foundation, Rio de Janeiro, RJ, Brazil
| | - Roberto Magalhães Saraiva
- Laboratory of Clinical Research on Chagas Disease, Evandro Chagas Infectious Disease Institute, Oswaldo Cruz Foundation, Rio de Janeiro, RJ, Brazil
| | - Alessandra Lifsitch Viçosa
- Experimental Pharmacotechnics Laboratory, Department of Galenic Innovation, Institute of Drug Technology - Farmanguinhos, Oswaldo Cruz Foundation, Rio de Janeiro, RJ, Brazil
| | - Sandra Aurora Chavez Perez
- Project Management Technical Assistance, Institute of Drug Technology - Farmanguinhos, Oswaldo Cruz Foundation, Rio de Janeiro, RJ, Brazil
| | - Sônia Gumes Andrade
- Experimental Chagas Disease Laboratory, Gonçalo Moniz Institute, Oswaldo Cruz Foundation, Salvador, BA, Brazil
| | - Ana Márcia Suarez-Fontes
- Innovations in Therapies, Education and Bioproducts Laboratory, Oswaldo Cruz Institute, Oswaldo Cruz Foundation, Rio de Janeiro, RJ, Brazil
| | - Marcos André Vannier-Santos
- Innovations in Therapies, Education and Bioproducts Laboratory, Oswaldo Cruz Institute, Oswaldo Cruz Foundation, Rio de Janeiro, RJ, Brazil
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Rosa RB, da Costa MS, Teixeira SC, de Castro EF, Dantas WM, Ferro EAV, da Silva MV. Calomys callosus: An Experimental Animal Model Applied to Parasitic Diseases Investigations of Public Health Concern. Pathogens 2022; 11:pathogens11030369. [PMID: 35335694 PMCID: PMC8948650 DOI: 10.3390/pathogens11030369] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2022] [Revised: 03/07/2022] [Accepted: 03/14/2022] [Indexed: 01/27/2023] Open
Abstract
The appearance and spread of parasitic diseases around the world aroused the interest of the scientific community to discover new animal models for improving the quality and specificity of surveys. Calomys callosus is a rodent native to South America, an easy handling model, with satisfactory longevity and reproducibility. C. callosus is susceptible to toxoplasmosis and can be used as experimental model for the study the pathogenesis, treatment, vertical transmission, and ocular toxoplasmosis. C. callosus can also be used to study cutaneous and visceral leishmaniasis, as the animals present cutaneous lesions, as well as parasites in the organs. C. callosus has epidemiological importance in Chagas disease, and since it is a Trypanosoma cruzi natural host in which rodents show high parasitemia and lethality, they are also effective as a model of congenital transmission. In the study of schistosomiasis, Schistosoma mansoni was proven to be a C. callosus natural host; thus, this rodent is a great model for fibrosis, hepatic granulomatous reaction, and celloma associated with lymphomyeloid tissue (CALT) during S. mansoni infection. In this review, we summarize the leading studies of parasitic diseases that used C. callosus as a rodent experimental model, describing the main uses and characteristics that led them to be considered an effective model.
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Affiliation(s)
- Rafael Borges Rosa
- Rodents Animal Facilities Complex, Federal University of Uberlandia, Uberlandia 38400-902, Brazil; (R.B.R.); (M.S.d.C.); (E.F.d.C.)
| | - Mylla Spirandelli da Costa
- Rodents Animal Facilities Complex, Federal University of Uberlandia, Uberlandia 38400-902, Brazil; (R.B.R.); (M.S.d.C.); (E.F.d.C.)
| | - Samuel Cota Teixeira
- Institute of Biomedical Sciences, Federal University of Uberlandia, Uberlandia 38405-318, Brazil; (S.C.T.); (E.A.V.F.)
| | - Emilene Ferreira de Castro
- Rodents Animal Facilities Complex, Federal University of Uberlandia, Uberlandia 38400-902, Brazil; (R.B.R.); (M.S.d.C.); (E.F.d.C.)
| | | | - Eloisa Amália Vieira Ferro
- Institute of Biomedical Sciences, Federal University of Uberlandia, Uberlandia 38405-318, Brazil; (S.C.T.); (E.A.V.F.)
| | - Murilo Vieira da Silva
- Rodents Animal Facilities Complex, Federal University of Uberlandia, Uberlandia 38400-902, Brazil; (R.B.R.); (M.S.d.C.); (E.F.d.C.)
- Correspondence:
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Pereira AV, Góis MB, Lera KRJL, Falkowski-Temporini GJ, Massini PF, Drozino RN, Aleixo DL, Miranda MM, da Silva Watanabe P, Conchon-Costa I, da Costa IN, Dos Anjos Neto Filho M, de Araújo SM, Pavanelli WR. Histopathological lesions in encephalon and heart of mice infected with Toxoplasma gondii increase after Lycopodium clavatum 200dH treatment. Pathol Res Pract 2016; 213:50-57. [PMID: 27894616 DOI: 10.1016/j.prp.2016.11.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/31/2015] [Revised: 10/26/2016] [Accepted: 11/03/2016] [Indexed: 02/07/2023]
Abstract
In many cases, symptoms of toxoplasmosis are mistaken for the ones of other infectious diseases. Clinical signs are rare in immunocompetent people. However, when they arise, in the acute phase of infection, several organs are affected due to the rapid spread of tachyzoites through the bloodstream. In the present study, the reduction of tachyzoites in peripheral blood of mice of G72 (infected 72h after treatment) and G48 (infected 48h after treatment and treated three more times), when compared with IC (infected and non-treated), suggests protective effect exerted by Lycopodium clavatum. If on the one hand L. clavatum brought benefits, reducing parasitemia, on the other hand, the parasitism became exacerbated. Histopathological analysis demonstrated focal, multifocal and diffuse inflammatory infiltrates, ranging from absent, discreet, moderate to intense, in heart and encephalon of mice of NIC (non-infected and non-treated), IC, G48 and G72 groups, respectively. In the perivascular region and meninges, the injuries were enlarged. The presence of tachyzoites was demonstrated through immunohistochemical (IHC) assay in myocardium. Toxoplasma gondii induced increase of collagen fibers in myocardium of mice of G72 and G48 groups, compared with IC (p<0.05) and NIC (p<0.001). The presence of inflammatory infiltrates, as well as the progressive fibrosis, caused myocardial remodeling in animals treated with L. clavatum. Counterstaining with H&E suggests TGF-β expression by mononuclear cells in the inflammatory infiltrate. Based on our results, we can conclude that the adopted regimen and potency exerted a protective effect, reducing parasitemia. However, it intensified the histopathological lesions in encephalon and heart of mice infected with T. gondii.
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Affiliation(s)
- Andréia Vieira Pereira
- Department of Experimental Pathology, State University of Londrina, Londrina, PR, Brazil
| | - Marcelo Biondaro Góis
- Department of Morphological Sciences, State University of Maringa, Maringa, PR, Brazil.
| | | | | | | | | | - Denise Lessa Aleixo
- Department of Health Sciences, State University of Maringa, Maringa, PR, Brazil
| | | | | | - Ivete Conchon-Costa
- Department of Experimental Pathology, State University of Londrina, Londrina, PR, Brazil
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Paracoccidioides brasiliensis pancreatic destruction in Calomys callosus experimentally infected. BMC Microbiol 2009; 9:84. [PMID: 19422699 PMCID: PMC2685139 DOI: 10.1186/1471-2180-9-84] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2009] [Accepted: 05/07/2009] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND The wild rodent Calomys callosus is notably resistant to Trypanosoma cruzi infection. In order to better characterize this animal model for experimental infections, we inoculated C. callosus intraperitoneally with Paracoccidioides brasiliensis, a thermally dimorphic fungus that causes a chronic disease with severe granuloma formation in the mouse and humans. The dissemination of P. brasiliensis cells through the lungs, liver, pancreas, and spleen was assessed by histological analysis. RESULTS The animals were susceptible to infection and showed a granulomatous reaction. C. callosus presented peritonitis characterized by the presence of exudates containing a large number of yeast cells. Extensive accumulation of yeast cells with intense destruction of the parenchyma was observed in the pancreas, which reduced the glucose levels of infected animals. These lesions were regressive in the liver, spleen, and lungs until complete recovery. The role of estrogen during C. callosus infection with P. brasiliensis was addressed by infecting ovariectomized animals. It was observed a reduced inflammatory response as well as reduced extension of tissue damage. Removal of ovaries reestablished the normal glucose levels during infection. CONCLUSION Taken together, the results presented here reveal the pancreas as being an important organ for the persistence of P. brasiliensis during infection of C. callosus and that estrogen plays an important role in the susceptibility of the animals to this pathogen.
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D'Ambrósio Fernandes R, Caetano LC, dos Santos CD, Abrahão AAC, Pinto ACH, Prado JC. Alterations triggered by steroid gonadal hormones in triglycerides and the cellular immune response of Calomys callosus infected with the Y strain of Trypanosoma cruzi. Vet Parasitol 2008; 152:21-7. [PMID: 18242862 DOI: 10.1016/j.vetpar.2007.12.011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2007] [Revised: 12/04/2007] [Accepted: 12/10/2007] [Indexed: 11/29/2022]
Abstract
Calomys callosus is a wild rodent found naturally infected with different Trypanosoma cruzi strains. In the work described here, groups of male and female C. callosus were subjected to orchiectomy, ovariectomy and sham operation. One month after surgery, animals were inoculated intraperitoneally (i.p.) with 4x10(4) blood trypomastigotes of the "Y" strain of T. cruzi. Parasitemia, triglycerides, nitric oxide (NO) and concanavalin A (ConA)-induced proliferation were evaluated. Parasitemia during the course of infection was significantly higher in infected and sham operated animals as compared to infected orchiectomized animals. The opposite was observed in the ovariectomized and infected group. Orchiectomized and infected animals displayed elevated triglyceride levels, as well as a more vigorous immune response, with higher splenocyte proliferation and elevated concentrations of NO. Ovariectomy resulted in an impaired immune response, as observed by a reduction of splenocyte proliferation and NO concentration. The results suggest a pivotal role for gonadal hormones in the modulation of triglyceride levels and the magnitude of the immune response during the acute phase of T. cruzi infection.
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Affiliation(s)
- Renata D'Ambrósio Fernandes
- Departamento de Análises Clínicas, Toxicológicas e Bromatológicas, Faculdade de Ciências Farmacêuticas de Ribeirão Preto FCFRP-USP, Universidade de São Paulo, Ribeirão Preto, SP, Brazil
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de Lima Pereira SA, dos Santos VM, Rodrigues DBR, da Cunha Castro EC, dos Reis MA, de Paula Antunes Teixeira V. Quantitative analysis of fibrosis and mast cells in the tongue of chronic chagasic patients: autopsy study. Med Mal Infect 2007; 37:229-33. [PMID: 17346914 DOI: 10.1016/j.medmal.2006.11.013] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2006] [Accepted: 11/27/2006] [Indexed: 10/23/2022]
Abstract
OBJECTIVE Recently, an orally transmitted outbreak of Chagas disease was reported in Santa Catarina, Brazil, after ingestion of sugar cane juice (garapa). This disease is caused by Trypanosoma cruzi, a parasite that stimulates the development of chronic inflammatory response, characterized by fibrous connective tissue neoformation (fibrosis). As the density of tissue mast cells (MC) may be an index of fibroblast proliferation and development of local fibrosis, the purpose of this autopsy study was to quantify the fibrosis rate and the number of MC in the tongues of chronic chagasic (CC) patients, compared with a non-chagasic (NC) control group. METHODOLOGY Twenty-four evaluations, with a quantitative assessment of fibrosis percentage and MC density were performed. RESULTS The percentage of fibrosis in the tongue was higher among CC than in the control group. In the CC group, a positive and significant correlation was found when the fibrosis rate was compared with the MC density. CONCLUSIONS These morphometric findings suggest that tongue biopsy may be useful to study specific changes associated with Chagas disease. They also suggest that the systematic analysis of oral cavity, including tongue histopathology changes, could be useful in forensic pathology of the orally acquired chronic Chagas disease.
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Berbert ALCV, Faria GG, Gennari-Cardoso ML, Silva MMMD, Mineo JR, Loyola AM. Histological and serological evidence of experimental paracoccidioidomycosis in Calomys callosus (Rodentia: Cricetidae). Int J Exp Pathol 2006; 88:55-62. [PMID: 17244339 PMCID: PMC2517285 DOI: 10.1111/j.1365-2613.2006.00513.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
The responses of animal experimental models related to the infectivity, virulence and pathogenicity of Paracoccidioides brasiliensis is constantly used to develop new perspectives of investigation. The rodent Calomys callosus, Rengger 1830 (Rodentia: Cricetidae) is an indigenous inhabitant of the savannah environment found in the central regions of Brazil. The aim of the present work was to evaluate the histopathological and serological features of C. callosus after inoculation with the Pb18 strain of P. brasiliensis. Furthermore, A/Sn and B10.A mice strains were also tested to compare the results obtained in C. callosus to these well-established experimental models of resistance and susceptibility respectively. In every instance, survival analysis was performed, and histopathological study of the lungs, liver and spleen was employed to investigate tissue involvement, degree of inflammation and fungal presence. Levels of antibodies to P. brasiliensis were measured by using an enzyme-linked immunosorbent assay after 4 weeks and at the advanced stage of infection. The mortality rate was proportional to inoculation dose in all groups, but overall it was much superior in C. callosus than in the B10.A-susceptible mice. Macroscopical and microscopical pathological alterations were also more extensive and remarkable for C. callosus, once again proportional to inoculation dose, but more noticeable differences among the studied groups were found with 0.6x10(5) inoculum. In addition, the serological profile of C. callosus was similar to that found for B10.A-susceptible mice. Infection of C. callosus with 0.6x10(8) Pb18 inoculum resulted in more serious illness, and it decreased in severity in proportion to the inoculum dose. This difference was more pronounced in C. callosus, and the clinical, serological and pathological findings in this animal were more intense and precocious compared with the B10.A-susceptible mice. The present results suggest that C. callosus is a potentially alternative experimental animal model for paracoccidioidomycosis infection.
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Affiliation(s)
- Alceu L C V Berbert
- Department of Dermatology, School of Medicine, Federal University of Uberlândia, Uberlândia (MG), Brazil
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Magalhães-Santos IF, Andrade SG. Participation of cytokines in the necrotic-inflammatory lesions in the heart and skeletal muscles of Calomys callosus infected with Trypanosoma cruzi. Mem Inst Oswaldo Cruz 2005; 100:555-61. [PMID: 16184235 DOI: 10.1590/s0074-02762005000500017] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Calomys callosus, a sylvatic reservoir of Trypanosoma cruzi, when infected with the Colombian strain (Biodeme Type III, T. cruzi I ) develops necrotic-inflammatory lesions and intense early fibrogenesis in the heart and skeletal muscles, that spontaneously regress. Participation of pro-inflammatory and pro-fibrogenic cytokines, such as tumor necrosis factor-alpha (TNF-alpha), gamma interferon (IFN-gamma) , and tumor growth factor-beta (TGF-beta), in the pathogenesis of the lesions is herein studied. Eighty C. callosus weighing 20 to 30 g were used. Seventy of them were inoculated with the Colombian strain (10(5) blood forms) and 10 were maintained as intact non-infected controls. After infection, C. callosus were sacrificed at different time-points from 15 to 70 days. The heart and skeletal muscle were processed for histopathology and cryopreserved for immunohistochemistry. Early necrotic lesions of parasitized skeletal muscle and myocardium with intense inflammatory lesions were present. Search for the in situ presence of TNF-alpha and IFN-gamma, was performed using rat-IgG anti-mouse antibodies against these cytokines. For the in situ search of TGF-beta, rabbit IgG anti-mouse antibodies were used. Immunolabeling of the cytokines in tissues of infected C. callosus was successful. The cytokines TNF-alpha, IFN-gamma , and TGF-beta were detected in the cytoplasm of macrophages and in the necrotic material from 15 to 45 days post-infection, decreasing their intensity until complete disappearance by the 65th day, which correlated with subsiding histopathological lesions. These findings suggest the participation of these cytokines in the control of parasite multiplication, in the development of an early fibrogenesis and in the regression of fibrotic-inflammatory lesions observed in C. callosus.
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Affiliation(s)
- Isis F Magalhães-Santos
- Laboratório de Chagas Experimental, Auto-imunidade e Imunologia Celular, Centro de Pesquisas Gonçalo Moniz, Fiocruz, Salvador, BA, 40295-001, Brazil
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Magalhães-Santos IF, Souza MM, Lima CSC, Andrade SG. Infection of Calomys callosus (Rodentia Cricetidae) with strains of different Trypanosoma cruzi biodemes: pathogenicity, histotropism, and fibrosis induction. Mem Inst Oswaldo Cruz 2004; 99:407-13. [PMID: 15322631 DOI: 10.1590/s0074-02762004000400011] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The influence of different Trypanosoma cruzi biodemes on the evolution of the infection and on the histopathological lesions of the heart and skeletal muscles, during the experimental infection of Calomys callosus, was investigated. Three groups of C. callosus were infected, respectively, with parasite strains representative of three different Biodemes: Type I (Y strain), Type II (21 SF strain), and Type III (Colombian strain). For each group, normal C. callosus were also used as controls. Marked differences have been detected in the responses of C. callosus to the infection with the three strains in this model. The strains Types I and II (Y and 21 SF) determined moderate lesions, mostly in the myocardium, with low parasitism, a rapid course, and total regression of the lesions by the 60th day of infection. Differently, Type III strain (Colombian), was more pathogenic for C. callosus and induced necrotic-inflammatory lesions in skeletal muscles and myocardium, in correspondence to intracellular parasitism. Proliferation of fibroblasts and amorphous matrix deposits, followed by interstitial fibrosis were present. Progressive regression of the inflammatory changes and collagen deposits occurred spontaneously. The progression and regression of both inflammation and fibrosis induced by the Colombian strain were further submitted to quantitative evaluation by morphometry. Results of the morphometric studies presented good correlation with the histopathological findings. The results confirm the importance of the different biodemes in the determination of tissue lesions and the peculiarities of response of C. callosus to infection with T. cruzi.
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Affiliation(s)
- Isis Fernandes Magalhães-Santos
- Laboratório de Doença de Chagas Experimental, Autoimunidade e Imunologia Celular e Laboratório de Patologia Experimental, Centro de Pesquisas Gonçalo Moniz-Fiocruz, Rua Valdemar Falcão 121, 40295-001 Salvador, BA, Brazil
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Magalhaes-Santos IF, Lima ES, Andrade SG. Fibrogenesis and collagen resorption in the heart and skeletal muscle of Calomys callosus experimentally infected with Trypanosoma cruzi: immunohistochemical identification of extracellular matrix components. Mem Inst Oswaldo Cruz 2002; 97:703-10. [PMID: 12219139 DOI: 10.1590/s0074-02762002000500021] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Intense inflammatory lesions and early development of interstitial fibrosis of the myocardium and skeletal muscle with spontaneous regression, have been described in Calomys callosus infected with Trypanosoma cruzi. The genetic types of collagen present in this model were investigated through immunohistochemistry using specific antibodies, combined with histopathology and Picro-Sirius staining of collagen. Thirty-five calomys were infected with the Colombian strain of T. cruzi and sacrificed at 24, 30, 40, 60 and 90 days post-infection. Inflammatory lesions and fibrogenesis were prominent at the early phase of infection and significantly decreased during late infection. Immunoisotyping of the matrix components was performed by indirect immunofluorescence on 5 micro m thick cryostat sections using specific antibodies against laminin, fibronectin and isotypes I, III and IV of collagen. In the early phase, positive deposits of all the matrix components were present, with predominance of fibronectin, laminin and collagens types I and III in the myocardium and of types III and IV in the skeletal muscles. From the 40th day, type IV collagen predominates in the heart. At the late phase of infection (60th to 90th day), a clear fragmentation and decrease of all the matrix components were detected. Findings of the present study indicate that a modulation of the inflammatory process occurs in the model of C. callosus, leading to spontaneous regression of fibrosis independent of the genetic types of collagen involved in this process.
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Affiliation(s)
- Isis F Magalhaes-Santos
- Laboratório de Doença de Chagas Experimental, Centro de Pesquisas Gonçalo Moniz, Fiocruz, Salvador, BA, 40295-001, Brasil
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Borges MM, Vassao R, Andrade SG, Pereira CA, Kloetzel JK. Interferon-gamma levels during the course of Trypanosoma cruzi infection of Calomys callosus (Rodentia-Cricetidae) and Swiss mice. Parasitol Res 1995; 81:498-504. [PMID: 7567909 DOI: 10.1007/bf00931793] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Serum levels of interferon-gamma (IFN-gamma) were evaluated in Calomys callosus and Swiss mice during the course of infection by four strains of Trypanosoma cruzi. All strains stimulated the production of this interleukine; however, the timing of its onset and permanence varied among strains and between the two animal models. When chronically infected animals with no detectable serum IFN-gamma were challenged with the homologous strain, they produced quantities comparable with those obtained during the acute phase of infection. In C. callosus there was a correlation between H2O2 liberation by peritoneal macrophages and serum IFN-gamma levels, whereas no such correlation was found in mice. C. callosus had a higher capacity to heal histopathological lesions, whereas lesions in mice were progressive. The results obtained suggest that C. callosus develops well-adapted immune mechanisms that may be important for its role as a reservoir of T. cruzi.
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Affiliation(s)
- M M Borges
- Instituto de Medicina Tropical de São Paulo, Brazil
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