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. 1995 Nov;63(11):4307–4311. doi: 10.1128/iai.63.11.4307-4311.1995

Immune response to Schistosoma mansoni phosphoglycerate kinase during natural and experimental infection: identification of a schistosome-specific B-cell epitope.

K W Lee 1, A Thakur 1, A M Karim 1, P T LoVerde 1
PMCID: PMC173612  PMID: 7591063

Abstract

A cDNA clone encoding Schistosoma mansoni phosphoglycerate kinase (SmPGK) was previously identified by affinity-purified antibodies which are specific for 3-h-old schistosomula tegumental antigens. Antibodies to the recombinant SmPGK which has enzymatic activity were localized to various tissues including the tegument of the 3-h-old schistosomula and 42-day-old adult worms. In this study, we show that SmPGK is an immunogenic molecule in both natural infection in humans and experimental vaccination in animals. To understand the role that a highly conserved molecule like SmPGK played during schistosome infection, we affinity purified antibodies to SmPGK from patients with chronic schistosomiasis and demonstrated that they did not cross-react with human PGK. However, affinity-purified rabbit anti-SmPGK antibodies did show immunoreactivity to both human PGK and rabbit PGK. Thus, during natural infection antibodies that cross-react with human PGK are not produced; however, as a result of active immunization with an intact conserved molecule, such cross-reacting antibodies are produced. Immunological analysis of cyanogen bromide digests of SmPGK with monoclonal antibodies that recognize SmPGK but not human PGK identifies a B-cell epitope on a 12.2-kDa fragment represented by amino acids 61 to 174.

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Selected References

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