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Trypanosoma cruzi

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https://www.readbyqxmd.com/read/28333926/performance-of-tci-tcvi-tcii-chagas-flow-ate-igg2a-for-universal-and-genotype-specific-serodiagnosis-of-trypanosoma-cruzi-infection
#1
Glaucia Diniz Alessio, Fernanda Fortes de Araújo, Denise Fonseca Côrtes, Policarpo Ademar Sales Júnior, Daniela Cristina Lima, Matheus de Souza Gomes, Laurence Rodrigues do Amaral, Marcelo Antônio Pascoal Xavier, Andréa Teixeira-Carvalho, Olindo Assis Martins-Filho, Marta de Lana
Distinct Trypanosoma cruzi genotypes have been considered relevant for patient management and therapeutic response Chagas disease. However, typing strategies for genotype-specific serodiagnosis of Chagas disease are still unavailable and requires standardization for practical application. In this study, an innovative TcI/TcVI/TcII Chagas Flow ATE-IgG2a technique was developed with applicability for universal and genotype-specific diagnosis of T. cruzi infection. For this purpose, the reactivity of serum samples (percentage of positive fluorescent parasites-PPFP) obtained from mice chronically infected with TcI/Colombiana, TcVI/CL or TcII/Y strain as well as non-infected controls were determined using amastigote-AMA, trypomastigote-TRYPO and epimastigote-EPI in parallel batches of TcI, TcVI and TcII target antigens...
March 23, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28333923/interdisciplinary-approach-at-the-primary-healthcare-level-for-bolivian-immigrants-with-chagas-disease-in-the-city-of-s%C3%A3-o-paulo
#2
Maria Aparecida Shikanai Yasuda, Camila Gonçalves Sátolo, Noemia Barbosa Carvalho, Magda Maya Atala, Rosario Quiroga Ferrufino, Ruth Moreira Leite, Célia Regina Furucho, Expedito Luna, Rubens Antonio Silva, Marcia Hage, Caroline Medeji Ramos de Oliveira, Felipe Delatorre Busser, Vera Lucia Teixeira de Freitas, Dalva Marli Valerio Wanderley, Luzia Martinelli, Sonia Regina Almeida, Pedro Albajar Viñas, Nivaldo Carneiro
BACKGROUND/METHODS: In a pioneering cross-sectional study among Bolivian immigrants in the city of São Paulo, Brazil, the epidemiological profile, clinical manifestations and morbidity of Chagas disease were described. The feasibility of the management of Chagas disease at primary healthcare clinics using a biomedical and psychosocial interdisciplinary approach was also tested. Previously, a Trypanosoma cruzi (T. cruzi) infection rate of 4.4% among 633 immigrants was reported. The samples were screened using two commercial enzyme-linked immunoassay (ELISA) tests generated with epimastigote antigens, and those with discrepant or seropositive results were analyzed by confirmatory tests: indirect immunofluorescence (IFI), TESA-blot and a commercial recombinant ELISA...
March 23, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28329730/synthesis-of-novel-quinoline-based-4-5-dihydro-1h-pyrazoles-as-potential-anticancer-antifungal-antibacterial-and-antiprotozoal-agents
#3
Jonathan Ramírez-Prada, Sara M Robledo, Iván D Vélez, María Del Pilar Crespo, Jairo Quiroga, Rodrigo Abonia, Alba Montoya, Laura Svetaz, Susana Zacchino, Braulio Insuasty
A new series of N-substituted 2-pyrazolines 9a-f, 10a-f, 11a-f, 12a-f and 13a-f were obtained from the cyclocondensation reaction of [(7-chloroquinolin-4-yl)amino]chalcones 8a-f with hydrazine hydrate and its derivatives. Fourteen of the synthesized compounds including the starting chalcones were selected by US National Cancer Institute (NCI) for testing their anticancer activity against 60 different human cancer cell lines, with the most important GI50 values ranging from 0.28 to 11.7 μM (0.13-6.05 μg/mL) and LC50 values ranging from 2...
March 16, 2017: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28328108/ex-vivo-infection-of-human-placental-chorionic-villi-explants-with-trypanosoma-cruzi-and-toxoplasma-gondii-induces-different-toll-like-receptor-expression-and-cytokine-chemokine-profiles
#4
Christian Castillo, Lorena Muñoz, Ileana Carrillo, Ana Liempi, Christian Gallardo, Norbel Galanti, Juan Diego Maya, Ulrike Kemmerling
PROBLEM: Trypanosoma cruzi and Toxoplasma gondii present, respectively, low and high congenital transmission rates. The placenta as an immune regulatory organ expresses TLRs, leading to the secretion of cytokines. Both parasites are recognized by TLR-2, TLR-4, and TLR-9. Here, we studied if the parasites induce differences in TLR protein expression, cytokine profiles, and whether receptor inhibition is related to parasite infection. METHOD OF STUDY: Placental tissue explants were infected ex vivo with each parasite, TLRs protein expression, cytokine profile and parasite infection were determined by Western blotting, ELISA and qPCR...
March 22, 2017: American Journal of Reproductive Immunology: AJRI
https://www.readbyqxmd.com/read/28327801/analysis-of-the-seroprevalence-of-and-factors-associated-with-chagas-disease-in-an-endemic-area-in-northeastern-brazil
#5
Erlane Chaves Freitas, Maria de Fátima Oliveira, Arduina Sofia Ortet de Barros Vasconcelos, José Damião da Silva, Carlos Eduardo Menezes Viana, Kátia Cristina Morais Soares Gomes, Luciano Pamplona de Góes Cavalcanti
INTRODUCTION: Chagas disease (CD) is currently considered a neglected disease; hence, identifying the factors associated with its high prevalence is essential. This study aimed to identify the seroprevalence of and the possible factors associated with CD in inhabitants of the City of Limoeiro do Norte, Northeastern Brazil. METHODS: Between April and November 2013, blood collection was conducted and a semi-structured questionnaire was administered. Blood samples that showed positive or possible serology for anti-Trypanosoma cruzi antibodies based on indirect immunofluorescence, hemagglutination indirect, and an enzyme-linked immunosorbent assay were analyzed...
January 2017: Revista da Sociedade Brasileira de Medicina Tropical
https://www.readbyqxmd.com/read/28327800/trypanosoma-cruzi-i-genotype-among-isolates-from-patients-with-chronic-chagas-disease-followed-at-the-evandro-chagas-national-institute-of-infectious-diseases-fiocruz-brazil
#6
Tatiana da Silva Fonseca de Oliveira, Barbara Neves Dos Santos, Tainah Silva Galdino, Alejandro Marcel Hasslocher-Moreno, Otilio Machado Pereira Bastos, Maria Auxiliadora de Sousa
INTRODUCTION: Trypanosoma cruzi is the etiologic agent of Chagas disease in humans, mainly in Latin America. Trypanosome stocks were isolated by hemoculture from patients followed at Evandro Chagas National Institute of Infectious Diseases (FIOCRUZ) and studied using different approaches. METHODS: For species and genotype identification, the stocks were analyzed by parasitological techniques, polymerase chain reaction assays targeted to specific DNA sequences, isoenzyme patterns, besides sequencing of a polymorphic locus of TcSC5D gene (one stock)...
January 2017: Revista da Sociedade Brasileira de Medicina Tropical
https://www.readbyqxmd.com/read/28327099/differential-cytokine-profiling-in-chagasic-patients-according-to-their-arrhythmogenic-status
#7
Héctor Rodríguez-Angulo, Juan Marques, Ivan Mendoza, Marco Villegas, Alfredo Mijares, Núria Gironès, Manuel Fresno
BACKGROUND: Chagas disease is caused by the protozoan Trypanosoma cruzi and is characterized by heart failure and sudden death. Identifying which factors are involved in evolution and treatment response is actually challenging. Thus, the aim of this work was to determine the Th1/Th17 (IL-6, IL-2, TNF, IL-17 and IFN-γ) and Th2 (IL-4 and IL-10) serum profile in Venezuelan Chagasic patients stratified according amiodarone treatment, hypertension and arrhythmias. METHODS: Sera from 38 chagasic patients were analyzed to determine the level of cytokines by Multiplexed Bead-Based Immunoassays...
March 21, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28325373/host-parasite-relationships-and-life-histories-of-trypanosomes-in-australia
#8
C Cooper, P L Clode, C Peacock, R C A Thompson
Trypanosomes constitute a group of flagellate protozoan parasites responsible for a number of important, yet neglected, diseases in both humans and livestock. The most significantly studied include the causative agents of African sleeping sickness (Trypanosoma brucei) and Chagas disease (Trypanosoma cruzi) in humans. Much of our knowledge about trypanosome host-parasite relationships and life histories has come from these two human pathogens. Recent investigations into the diversity and life histories of wildlife trypanosomes in Australia highlight that there exists a great degree of biological and behavioural variation within and between trypanosomes...
2017: Advances in Parasitology
https://www.readbyqxmd.com/read/28325368/chagas-disease-diagnostic-applications-present-knowledge-and-future-steps
#9
V Balouz, F Agüero, C A Buscaglia
Chagas disease, caused by the protozoan Trypanosoma cruzi, is a lifelong and debilitating illness of major significance throughout Latin America and an emergent threat to global public health. Being a neglected disease, the vast majority of Chagasic patients have limited access to proper diagnosis and treatment, and there is only a marginal investment into R&D for drug and vaccine development. In this context, identification of novel biomarkers able to transcend the current limits of diagnostic methods surfaces as a main priority in Chagas disease applied research...
2017: Advances in Parasitology
https://www.readbyqxmd.com/read/28323069/minicircle-classes-heterogeneity-within-the-tciii-and-tciv-discrete-typing-units-of-trypanosoma-cruzi
#10
S Ortiz, G Osorio, A Solari
The taxon Trypanosoma cruzi, causative agent of Chagas disease, is composed of several discrete typing units (DTUs) named TcI-TcVI, and Tcbat. The history of the taxon T. cruzi is known, even though several controversial aspects remain as the relationships between TcIII and TcIV. We analyzed cloned T. cruzi stocks pertaining to the seven DTUs by filter hybridization tests of PCR amplicons from minicircle variable regions and kinetoplast DNA probes. Minicircle DNA blots from the cloned stocks and filter hybridization with one TcI, one TcII, one TcV, one TcVI, three TcIII, one TcIV from North America and one TcIV kinetoplast DNA probes from South America revealed minicircle variable region cross-reaction in some T...
March 16, 2017: Infection, Genetics and Evolution
https://www.readbyqxmd.com/read/28322302/mechanistic-insights-into-the-anti-angiogenic-activity-of-trypanosoma-cruzi-protein-21-and-its-potential-impact-on-the-onset-of-chagasic-cardiomyopathy
#11
Samuel Cota Teixeira, Daiana Silva Lopes, Sarah Natalie Cirilo Gimenes, Thaise Lara Teixeira, Marcelo Santos da Silva, Rebecca Tavares E Silva Brígido, Felipe Andrés Cordero da Luz, Aline Alves da Silva, Makswell Almeida Silva, Pilar Veras Florentino, Paula Cristina Brígido Tavares, Marlus Alves Dos Santos, Veridiana de Melo Rodrigues Ávila, Marcelo José Barbosa Silva, Maria Carolina Elias, Renato Arruda Mortara, Claudio Vieira da Silva
Chronic chagasic cardiomyopathy (CCC) is arguably the most important form of the Chagas Disease, caused by the intracellular protozoan Trypanosoma cruzi; it is estimated that 10-30% of chronic patients develop this clinical manifestation. The most common and severe form of CCC can be related to ventricular abnormalities, such as heart failure, arrhythmias, heart blocks, thromboembolic events and sudden death. Therefore, in this study, we proposed to evaluate the anti-angiogenic activity of a recombinant protein from T...
March 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28322201/association-of-cardiac-galectin-3-expression-myocarditis-and-fibrosis-in-chronic-chagas-disease-cardiomyopathy
#12
Bruno Solano de Freitas Souza, Daniela Nascimento Silva, Rejane Hughes Carvalho, Gabriela Louise de Almeida Sampaio, Bruno Diaz Paredes, Luciana Aragão França, Carine Machado Azevedo, Juliana Fraga Vasconcelos, Cassio Santana Meira, Paulo Chenaud Neto, Simone Garcia Macambira, Kátia Nunes da Silva, Kyan James Allahdadi, Fabio Tavora, João David de Souza Neto, Ricardo Ribeiro Dos Santos, Milena Botelho Pereira Soares
Chronic Chagas disease cardiomyopathy, caused by Trypanosoma cruzi infection, is a major cause of heart failure in Latin America. Galectin-3 (Gal-3) has been linked to cardiac remodeling and poor prognosis in heart failure of different etiologies. Herein, we investigated the involvement of Gal-3 in the disease pathogenesis and its role as a target for disease intervention. Gal-3 expression in mouse hearts was evaluated during T. cruzi infection by confocal microscopy and flow cytometry analysis, showing a high expression in macrophages, T cells, and fibroblasts...
March 16, 2017: American Journal of Pathology
https://www.readbyqxmd.com/read/28320630/early-polymerase-chain-reaction-detection-of-chagas-disease-reactivation-in-heart-transplant-patients
#13
Priscilla Almeida da Costa, Marcela Segatto, Danielle Fernandes Durso, Wagson José de Carvalho Moreira, Lucas Lodi Junqueira, Fábio Morato de Castilho, Silvio Amadeu de Andrade, Cláudio Léo Gelape, Egler Chiari, Andréa Teixeira-Carvalho, Sergio Danilo Junho Pena, Carlos Renato Machado, Gloria Regina Franco, Geraldo Brasileiro Filho, Maria da Consolação Vieira Moreira, Andréa Mara Macedo
BACKGROUND: Heart transplantation is a valuable therapeutic option for Chagas disease patients with severe cardiomyopathy. During patient follow-up, the differential diagnosis between cardiac transplant rejection and Chagas disease infection reactivation remains a challenging task, which hinders rapid implementation of the appropriate treatment. Herein we investigate whether polymerase chain reaction (PCR) strategies could facilitate early detection of Trypanosoma cruzi (T cruzi) in transplanted endomyocardial biopsies (EMBs)...
February 24, 2017: Journal of Heart and Lung Transplantation
https://www.readbyqxmd.com/read/28316976/mutagenic-and-cytotoxicity-lqb-123-profile-safety-and-tripanocidal-effect-of-a-phenyl-t-butylnitrone-derivative
#14
Mauricio Peixoto Cupello, Francis Monique Saraiva, Pedro Ippolito, Andréia da Silva Fernandes, Rubem Figueiredo Sadoko Menna-Barreto, Debora de Sousa Dos Santos Costa, Jessica Isis Oliveira Paula, Paulo Roberto Ribeiro Costa, Natália Pereira Nogueira, Israel Felzenswalb, Ayres Guimarães Dias, Marcia Cristina Paes
The therapeutic options for Chagas disease are limited and its treatment presents a number of drawbacks including toxicity, drug resistance, and insufficient effectiveness against the chronic stage of the disease. Therefore, new therapeutical options are mandatory. In the present work, we evaluated the effect of a phenyl-tert-butylnitrone (PBN) derivate, LQB 123, against Trypanosoma cruzi forms. LQB 123 presented a trypanocidal effect against bloodstream trypomastigotes (IC50 = 259.4 ± 6.1 μM) and intracellular amastigotes infecting peritoneal macrophages (IC50 = 188...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28306713/trypanocidal-effect-of-isotretinoin-through-the-inhibition-of-polyamine-and-amino-acid-transporters-in-trypanosoma-cruzi
#15
Chantal Reigada, Edward A Valera-Vera, Melisa Sayé, Andrea E Errasti, Carla C Avila, Mariana R Miranda, Claudio A Pereira
Polyamines are essential compounds to all living organisms and in the specific case of Trypanosoma cruzi, the causative agent of Chagas disease, they are exclusively obtained through transport processes since this parasite is auxotrophic for polyamines. Previous works reported that retinol acetate inhibits Leishmania growth and decreases its intracellular polyamine concentration. The present work describes a combined strategy of drug repositioning by virtual screening followed by in vitro assays to find drugs able to inhibit TcPAT12, the only polyamine transporter described in T...
March 17, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28304254/clinical-trypanosoma-cruzi-disease-after-cardiac-transplantation-in-a-cynomolgus-macaque-macaca-fascicularis
#16
Elana R Rybak, Steve Shipley, Ivan Tatarov, Tianshu Zhang, Wenji Sun, Gheorghe Braileanu, Lars Burdorf, Evelyn Sievert, Agnes M Azimzadeh, Louis J DeTolla, Richard N Pierson Iii
A cynomolgus macaque received a heterotopic cardiac allograft as part of a transplant study, with monoclonal antibodies targeted to specific immune costimulation molecules (CD154, CD28) but no traditional immunosuppressive therapy after surgery. Clinical anemia was detected on postoperative day (POD) 35 and had worsened (Hgb, 2.3 g/dL; Hct = 7.3%) by POD 47, despite type-matched whole-blood transfusions. After a total of 4 blood transfusions, hematologic parameters were improved (Hgb, 5.9 g/dL; Hct, 18.7%)...
December 1, 2016: Comparative Medicine
https://www.readbyqxmd.com/read/28302040/trypanothione-reductase-a-target-for-the-development-of-anti-trypanosoma-cruzi-drugs
#17
Karina Vázquez, Margot Paulino, Cristian O Salas, Juan J Zarate-Ramos, Brenda Vera, Gildardo Rivera
Chagas disease or American trypanosomiasis is a major parasitic disease in Latin America with treatment available via two drugs: nifurtimox and benznidazole. These two treatments are ineffective in the chronic phase of the disease. Therefore, there is a need for the development of new, efficient and safe drugs for the treatment of these diseases. With this goal, one of the promising targets proposed is the trypanothione reductase (TR), a key enzyme important in the metabolism of Trypanosoma cruzi. In this review, we analyze the importance of TR as a drug target, as well as their compounds inhibitors reported in the last decade as potential therapeutic agents for Chagas disease...
March 15, 2017: Mini Reviews in Medicinal Chemistry
https://www.readbyqxmd.com/read/28300547/computer-aided-quantification-of-microvascular-networks-application-to-alterations-due-to-pathological-angiogenesis-in-the-hamster
#18
Carlos A Bulant, Pablo J Blanco, Lucas O Müller, Julio Scharfstein, Erik Svensjö
Angiogenesis is both a physiological and a pathological process of great complexity, which is difficult to measure objectively and automatically. The hamster cheek pouch (HCP) prepared for intravital-microscopy (IVM) has been used to characterize microvascular functions in many studies and was chosen to investigate microvascular characteristics observed in normal non-infected hamsters as compared to those HCPs parasitized by Trypanosoma cruzi. Images of HCPs captured at IVM were subjected to computer based measurements of angiogenesis and histamine-induced macromolecular (FITC-dextran) leakage with an image segmentation approach that has the capacity to discriminate between fluorescence emitted by macromolecular tracers inside the vasculature and in the extravascular space...
March 12, 2017: Microvascular Research
https://www.readbyqxmd.com/read/28295355/frequency-of-trypanosoma-cruzi-parasitemia-among-infected-blood-donors-with-a-potential-association-between-parasite-lineage-and-transfusion-transmission
#19
David A Leiby, Megan L Nguyen, Melanie C Proctor, Rebecca L Townsend, Susan L Stramer
BACKGROUND: Trypanosoma cruzi is endemic to the Americas where it demonstrates multiple lineages over a vast geographic range (i.e., United States to Argentina). These lineages possess divergent geographic and biologic characteristics, including variations in disease manifestations. Herein, we report the frequency of parasitemia among seropositive US blood donors and the potential association between parasite lineage and transfusion transmission. STUDY DESIGN AND METHODS: Blood donors identified as T...
March 14, 2017: Transfusion
https://www.readbyqxmd.com/read/28294160/immune-complexes-in-chronic-chagas-disease-patients-are-formed-by-exovesicles-from-trypanosoma-cruzi-carrying-the-conserved-masp-n-terminal-region
#20
Isabel María Díaz Lozano, Luis Miguel De Pablos, Silvia Andrea Longhi, María Paola Zago, Alejandro Gabriel Schijman, Antonio Osuna
The exovesicles (EVs) are involved in pathologic host-parasite immune associations and have been recently used as biomarkers for diagnosis of infectious diseases. The release of EVs by Trypanosoma cruzi, the causative agent of Chagas disease, has recently been described, with different protein cargoes including the MASP multigene family of proteins MASPs are specific to this parasite and characterized by a conserved C-terminal (C-term) region and an N-terminal codifying for a signal peptide (SP). In this investigation, we identified immature MASP proteins containing the MASP SP in EVs secreted by the infective forms of the parasite...
March 15, 2017: Scientific Reports
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