Browsing by Author "Corral, Marcelo Andreetta"

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    Immunoreactivity of proteins within 30-40 kDa range during the acute and the recovery phases in rats experimentally infected with Strongyloides venezuelensis.
    (2020) Fonseca, Priscilla Duarte Marques; Corral, Marcelo Andreetta; Meisel, Dirce Mary Correia Lima; Levi, Debora; Nascimento, Rafael Correa; Borges, William de Castro; Gryschek, Ronaldo Cesar Borges; Cruz, Julia Maria Costa; Paula, Fabiana Martins de
    In experimental infection with Strongyloides venezuelensis, the acute and recovery phases can be distinguished, unlike human infections caused by Strongyloides stercoralis. The objective of this study was to evaluate the production of anti-Strongyloides IgG antibodies and the recognition of immunogenic protein bands during the acute and the recovery phases in rats experimentally infected with S. venezuelensis. Rats were infected subcutaneously with 400 or 4,000 S. venezuelensis infective larvae. The acute phase was characterized by elimination of a large number of eggs in the faeces on days 6-14 post infection; the recovery phase was characterized by the resolution of the infection between days 30 and 35 post infection. Differences in IgG levels were observed in the acute and the recovery phases. Different antigenic fractions were recognized in both phases of infection. It is concluded that proteins within the 30-40 kDa range are immunoreactive markers for both the acute and the recovery phases in rats experimentally infected with S. venezuelensis, particularly using membrane antigen.
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    Shotgun proteomics of Strongyloides venezuelensis infective third stage larvae : insights into host-parasite interaction and novel targets for diagnostics.
    (2020) Fonseca, Priscilla Duarte Marques; Corral, Marcelo Andreetta; Cosenza Contreras, Miguel de Jesus; Meisel, Dirce Mary Correia Lima; Melo, Gessica Baptista de; Antunes, Milena Monteiro de Souza; Santo, Maria C. E.; Gryschek, Ronaldo Cesar Borges; Cruz, Julia Maria Costa; Borges, William de Castro; Paula, Fabiana Martins de
    Strongyloides venezuelensis is an important alternative source of antigen for the serologic diagnosis of human strongyloidiasis. Proteomics techniques applied to the analysis of the protein content of infective third stage larvae (iL3) of S. venezuelensis provide a powerful tool for the discovery of new candidates for immunodiagnosis. This study presents an overview of the protein iL3 S. venezuelensis focusing on the diagnosis of strongyloidiasis. A total of 877 proteins were identified by shotgun proteomics. Many of these proteins are involved in different cellular processes, metabolic as well as structural maintenance. Our results point to a catalog of possible diagnostic targets for human strongyloidiasis and highlight the need for evaluation of uncharacterized proteins, especially the proteins within the CAP domain, transthyretin, and BTPI inhibitor domains, as a repertoire as yet unexplored in the context of strongyloidiasis diagnostic markers. We believe that the protein profile presented in this shotgun analysis extends our understanding of the protein composition within the Strongyloides genus, opening up new perspectives for research on biomarkers that may help with the diagnosis of human strongyloidiasis. Data are available via ProteomeXchange with identifier PXD013703.