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Schistosoma mansoni is a blood fluke that produces glycoconjugates containing the Lewis x antigen (Le(x)) Gal beta 1--&gt;4(Fuc alpha 1--&gt;3) GlcNAc beta 1--&gt;R. However, Le(x) antigen is also normally expressed in many tissues of adult rodents. We now report that mice and hamsters chronically infected with S.mansoni generate high titers of both IgM and IgG antibodies reactive with Le(x) and that no reactivity is present in sera from uninfected animals. Anti-Le(x) antibodies were detected by ELISA using the Le(x)-containing neoglycoprotein lacto-N-fucopentaoseIII-BSA. The IgG in infected animals consists of IgG1, IgG2a, and IgG2b subclasses and binds to Protein A-Sepharose. The sera of infected animals reacts only with Le(x) antigen and has no reactivity toward either Le(a) or sialyl Le(x). The IgM response to Le(x) is detectable at week 2, whereas the IgG response is detectable at weeks 5-6 following infection of mice. The sera of infected mice and hamsters can mediate the complement-dependent cytolysis (CDC) of cells expressing surface Le(x). This cytolytic activity is exclusively effected by the anti-Le(x) antibodies, since their removal from sera by adsorption depletes the sera of CDC activity. Thus, the abundant expression of the Le(x) antigens by the parasite elicits cytolytic antibodies reactive with a host antigen.

Rodents infected with Schistosoma mansoni produce cytolytic IgG and IgM antibodies to the Lewis x antigen