Naturally-acquired humoral immune responses against the N- and C- termini of the Plasmodium vivax MSP1 protein in endemic regions of Brazil and Papua New Guinea using a multiplex assay

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Title Naturally-acquired humoral immune responses against the N- and C- termini of the Plasmodium vivax MSP1 protein in endemic regions of Brazil and Papua New Guinea using a multiplex assay
Author Fernandez-Becerra, Carmen; Sanz, Sergi; Brucet, Marina; Stanisic, Danielle; Alves, Fabiana P; Camargo, Erney P; Alonso, Pedro L; Mueller, Ivo; Portillo, Hernando A del
Journal Name Malaria Journal
Year Published 2010
Place of publication United Kingdom
Publisher Biomed Central
Abstract Background Progress towards the development of a malaria vaccine against Plasmodium vivax, the most widely distributed human malaria parasite, will require a better understanding of the immune responses that confer clinical protection to patients in regions where malaria is endemic. Methods Glutathione S-transferase (GST) and GST-fusion proteins representing the N- terminus of the merozoite surface protein 1 of P. vivax, PvMSP1-N, and the C-terminus, PvMSP1-C, were covalently coupled to BioPlex carboxylated beads. Recombinant proteins and coupled beads were used, respectively, in ELISA and Bioplex assays using immune sera of P. vivax patients from Brazil and PNG to determine IgG and subclass responses. Concordances between the two methods in the seropositivity responses were evaluated using the Kappa statistic and the Spearman's rank correlation. Results The results using this methodology were compared with the classical microtitre enzyme-linked immnosorbent assay (ELISA), showing that the assay was sensitive, reproducible and had good concordance with ELISA; yet, further research into different statistical analyses seems desirable before claiming conclusive results exclusively based on multiplex assays. As expected, results demonstrated that PvMSP1 was immunogenic in natural infections of patients from different endemic regions of Brazil and Papua New Guinea (PNG), and that age correlated only with antibodies against the C-terminus part of the molecule. Furthermore, the IgG subclass profiles were different in these endemic regions having IgG3 predominantly recognizing PvMSP1 in Brazil and IgG1 predominantly recognizing PvMSP1 in PNG. Conclusions This study validates the use of the multiplex assay to measure naturally-acquired IgG antibodies against the merozoite surface protein 1 of P. vivax.
Peer Reviewed Yes
Published Yes
Alternative URI http://dx.doi.org/10.1186/1475-2875-9-29
Copyright Statement Copyright 2010 Fernandez-Becerra et al; licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Volume 9
Issue Number 1
Page from 1
Page to 8
ISSN 1475-2875
Date Accessioned 2011-03-22
Language en_AU
Research Centre Institute for Glycomics
Faculty Faculty of Science, Environment, Engineering and Technology
Subject Humoural Immunology and Immunochemistry
URI http://hdl.handle.net/10072/37992
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1x

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