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Malaria Journal

, 7:129

First Online: 14 July 2008Received: 07 May 2008Accepted: 14 July 2008

Abstract

BackgroundAntibodies are the main effectors against malaria blood-stage parasites. Evaluation of functional activities in immune sera from Phase 2a-b vaccine trials may provide invaluable information in the search for immune correlates of protection. However, the presence of anti-malarial-drugs, improper collection-storage conditions or concomitant immune responses against other pathogens can contribute to non-specific anti-parasite activities when the sera-plasma are tested in vitro. Purification of immunoglobulin is a standard approach for reducing such non-specific background activities, but the purification method itself can alter the quality and yield of recovered Ag-specific antibodies.

MethodsTo address this concern, various immunoglobulin Ig purification methods protein G Sepharose, protein A-G Sepharose, polyethylene glycol and caprylic acid-ammonium sulphate precipitation were evaluated for their impact on the quality, quantity and functional activity of purified rabbit and human Igs. The recovered Igs were analysed for yield and purity by SDS-PAGE, for quality by Ag-specific ELISAs determining changes in titer, avidity and isotype distribution and for functional activity by in vitro parasite growth inhibition assay GIA.

ResultsThis comparison demonstrated that overall polyethylene glycol purification of human serum-plasma samples and protein G Sepharose purification of rabbit sera are optimal for recovering functional Ag-specific antibodies.

ConclusionConsequently, critical consideration of the purification method is required to avoid selecting non-representative populations of recovered Ig, which could influence interpretations of vaccine efficacy, or affect the search for immune correlates of protection.

Electronic supplementary materialThe online version of this article doi:10.1186-1475-2875-7-129 contains supplementary material, which is available to authorized users.

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Autor: Elke S Bergmann-Leitner - Ryan M Mease - Elizabeth H Duncan - Farhat Khan - John Waitumbi - Evelina Angov

Fuente: https://link.springer.com/



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