54 research outputs found

    Subtractive phage display selection from canine visceral leishmaniasis identifies novel epitopes that mimic leishmania infantum antigens with potential serodiagnosis applications

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    Visceral leishmaniasis (VL) is a zoonotic disease that is endemic to Brazil, where dogs are the main domestic parasite reservoirs, and the percentages of infected dogs living in regions where canine VL (CVL) is endemic have ranged from 10% to 62%. Despite technological advances, some problems have been reported with CVL serodiagnosis. The present study describes a sequential subtractive selection through phage display technology from polyclonal antibodies of negative and positive sera that resulted in the identification of potential bacteriophage-fused peptides that were highly sensitive and specific to antibodies of CVL. A negative selection was performed in which phage clones were adhered to purified IgGs from healthy and Trypanosoma cruzi-infected dogs to eliminate cross-reactive phages. The remaining supernatant nonadhered phages were submitted to positive selection against IgG from the blood serum of dogs that were infected with Leishmania infantum. Phage clones that adhered to purified IgGs from the CVL-infected serum samples were selected. Eighteen clones were identified and their reactivities tested by a phage enzyme-linked immunosorbent assay (phage-ELISA) against the serum samples from infected dogs (n 31) compared to those from vaccinated dogs (n 21), experimentally infected dogs with cross-reactive parasites (n 23), and healthy controls (n 17). Eight clones presented sensitivity, specificity, and positive and negative predictive values of 100%, and they showed no crossreactivity with T. cruzi- or Ehrlichia canis-infected dogs or with dogs vaccinated with two different commercial CVL vaccines in Brazil. Our study identified eight mimotopes of L. infantum antigens with 100% accuracy for CVL serodiagnosis. The use of these mimotopes by phage-ELISA proved to be an excellent assay that was reproducible, simple, fast, and inexpensive, and it can be applied in CVL-monitoring programsThis work was supported by grants from the PrĂł-Reitoria de Pesquisa of UFMG (supported 03/2013), the Instituto Nacional de CiĂȘncia e Tecnologia em Nano-BiofarmacĂȘutica (INCT Nano-Biofar), Rede Nanobiotec/Brasil-UFU (CAPES), PRONEX-FAPEMIG (APQ-01019- 09), FAPEMIG (APQ-00496-11 and APQ-00819-12), and CNPq (APQ- 472090/2011-9 and APQ-482976/2012-8). E.A.F.C. and L.R.G. are recipients of grants from CNPq. M.A.C.-F. is the recipient of a grant from FAPEMIG/CAPE

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    Este nĂșmero da Revista EstĂșdio assinala a crescente maturação de um espaço de comunicação algo alternativo, onde artistas falam de artistas, dĂŁo a conhecer obras menos conhecidas, e ocupam uma ĂĄrea de curadoria expontĂąnea e paralela aos centros do arte world. DĂĄ-se a palavra aos prĂłprios criadores, e hĂĄ seis anos que o seu olhar vem enriquecendo um patrimĂłnio crescente, com especiais ligaçÔes aos paĂ­ses onde se fala as lĂ­nguas ibĂ©ricas. A presença de obras de Portugal, Espanha, Brasil, Angola, Argentina, PerĂș, Venezuela, BolĂ­via e muitos outros paĂ­ses tornou-se habitual, fazendo da EstĂșdio uma instĂąncia da semiosfera (Lotman). Mais do que a presença, Ă© a dimensĂŁo do conhecimento transmitido, a que se segue, naturalmente, o estabelecimento de novas teias de referĂȘncia entre os artistas destes paĂ­ses: hĂĄ novos grupos, novas cumplicidades, novas realizaçÔes dentro deste EstĂșdio, que completa seis anos de publicação persistente. A Revista EstĂșdio Ă© tambĂ©m mais uma via disponĂ­vel para o exercĂ­cio da interpretação, atravĂ©s de descodificaçÔes mais informadas, mais negociadas, dos textos artĂ­sticos, pois sĂŁo efectuadas por outros artistas. Reuniram-se nesta edição 24 artigos originais, mantendo a sua linha editorial inicial. O projecto mantĂ©m a sua componente de resistĂȘncia, de plataforma de conhecimento para os pares, nĂŁo abdicando tambĂ©m da validação externa, ou seja, do uso de protocolos de produção e transmissĂŁo de conhecimento. Falamos pois das normas de redação, de referenciação, de estruturação de textos e de articulação de argumentos, visuais ou verbais. Estabelece-se neste volume uma articulação entre cinema, vĂ­deo, redes, escultura, instalação, fotografia, performance, banda desenhada, pintura, cerĂąmica, poesia concreta, livros de artista, sendo este conjunto nĂŁo exaustivo testemunha do grau de hibridação que hoje o discurso artĂ­stico convoca. Apanhando-lhe o pulso, a EstĂșdio acompanha a arte desde os seus produtores, dos seus procedimentos, dos seus recursos, dos seus resultados. A EstĂșdio permite visitar muitos estĂșdios.info:eu-repo/semantics/publishedVersio

    2 nd Brazilian Consensus on Chagas Disease, 2015

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    Abstract Chagas disease is a neglected chronic condition with a high burden of morbidity and mortality. It has considerable psychological, social, and economic impacts. The disease represents a significant public health issue in Brazil, with different regional patterns. This document presents the evidence that resulted in the Brazilian Consensus on Chagas Disease. The objective was to review and standardize strategies for diagnosis, treatment, prevention, and control of Chagas disease in the country, based on the available scientific evidence. The consensus is based on the articulation and strategic contribution of renowned Brazilian experts with knowledge and experience on various aspects of the disease. It is the result of a close collaboration between the Brazilian Society of Tropical Medicine and the Ministry of Health. It is hoped that this document will strengthen the development of integrated actions against Chagas disease in the country, focusing on epidemiology, management, comprehensive care (including families and communities), communication, information, education, and research
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