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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
Evaluation of immunoglobulin purification methods and their impact on quality and yield of antigen-specific antibodies
Malaria Journal, Volume 7, Article 129, Year 2008
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Description
Background. Antibodies 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. Methods. To 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). Results. This 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. Conclusion. Consequently, 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. © 2008 Bergmann-Leitner et al; licensee BioMed Central Ltd.
Authors & Co-Authors
Bergmann-Leitner, Elke S.
United States, Silver Spring
Wrair
Mease, Ryan M.
United States, Silver Spring
Wrair
Duncan, Elizabeth H.
United States, Silver Spring
Wrair
Khan, Farhat A.
United States, Silver Spring
Wrair
Waitumbi, John Njenga
Kenya, Nairobi
Kenya Medical Research Institute
Angov, Evelina
United States, Silver Spring
Wrair
Statistics
Citations: 68
Authors: 6
Affiliations: 2
Identifiers
Doi:
10.1186/1475-2875-7-129
e-ISSN:
14752875
Research Areas
Infectious Diseases