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Immunochemical characterisation of Schistosoma mansoni glycolipid antigens.

Abstract：

:The aim of this study was to investigate the occurrence, distribution and immunochemical properties of antibody-defined carbohydrate epitopes in neutral glycolipid fractions of Schistosoma mansoni eggs, cercariae and adults. The amount of extractable, antigenic, neutral glycolipids was lowest in adult worms, increasing consecutively in cercariae and eggs. The immunoreactivity of the glycolipids resided in the carbohydrate moiety in that it was periodate-sensitive. Serological reactivity, and monosaccharide component analysis, anomeric configuration and methylation-linkage analyses indicated that there were two dominant epitopes, which could be partially defined immunologically. The first epitope was detected on egg, cercarial and adult glycolipids. It was strongly recognised by mouse chronic infection sera and rabbit hyperimmune sera raised against specific egg antigens, and was defined by the monoclonal antibody M2D3H (Bickle QD, Andrews BJ. Characterisation of Schistosoma mansoni monoclonal antibodies which block in-vitro killing: failure to demonstrate blockage of immunity in vivo. Parasite Immunol 1988;10:151-168). M2D3H appeared to have the same epitope specificity as monoclonal antibody 128C3/3 (Weiss J, Magnani JL, Strand M. Identification of Schistosoma mansoni glycolipids that share immunogenic carbohydrate epitopes with glycoproteins. J Immunol. 1986;136:4275-82). The internal epitope was defined structurally by the presence of fucose 3-linked to 3,4-disubstituted N-acetylglucosamine, which was itself partially substituted by a second fucose residue, to yield the determinant -4[Fucalpha1,2Fucalpha3]GlcNAcbeta1-. The second epitope was defined by the anti-LewisX monoclonal antibody 4D1 and was found primarily on cercarial glycolipids. It was chemically characterised as the LewisX epitope of Galbeta1,4[Fucalpha1,3]GlcNAcbeta1- in a terminal position. The removal of fucose greatly diminished the binding of the anti-LewisX and M2D3H monoclonal antibodies, as well as the polyclonal chronic infection sera, to glycolipids of all three life-cycle stages and thus revealed the epitopic importance of fucose.

journal_name

Mol Biochem Parasitol

journal_title

Molecular and biochemical parasitology

authors

Wuhrer M,Dennis RD,Doenhoff MJ,Bickle Q,Lochnit G,Geyer R

doi

10.1016/s0166-6851(99)00123-1

subject

Has Abstract

pub_date

1999-10-15 00:00:00

pages

155-69

issue

2

eissn

0166-6851

issn

1872-9428

pii

S0166-6851(99)00123-1

journal_volume

103

pub_type

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