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Localization and characterization of the antigenic components of sparganum which induced IgG and IgM antibodies in the host were studied by immunohistochemical techniques and SDS-PAGE and Western blotting. The antigen recognized by IgG antibody of rats or mice which were immunized by infection or injection of crude extracts of metacestodes of Spirometra erinacei, was located in the parenchyma of sparganum, especially at the cortex and around the calcareous corpuscles. The immunoreaction was demonstrated not only in the encysted fibrous wall of host but around the arterioles or venules in the connective tissue of host. The antigen recognized by IgM antibody of rats or mice was also observed in the parenchyma of sparganum and in the connective tissue of host. By 5-20% gradient SDS-PAGE and EIBT, we detected antigenic components by IgG and IgM antibodies of the rat or mouse immunized by infection or injection of crude extract of spargana. Twenty-three antigenic bands from crude extracts of spargana were recognized by IgG antibody and 15 components by IgM antibody of immunized rats. Out of the bands recognized by IgG and IgM antibodies, 15 were cross-reacted each other. Twenty components of excretory-secretory proteins from spargana were recognized by IgG, and 5 components by IgM antibody of immunized rats. By IgG and IgM antibodies of immunized mice, 16 components of crude extracts were recognized by IgG antibody and 9 components by IgM antibody. Twenty components of excretory-secretory preparation were recognized by IgG antibody and 5 components by IgM antibody. Thirteen components of crude extracts were cross-reacted by IgG antibody of rats and mice.

Immunohistochemical observation on the antigens inducing IgG and IgM antibodies against sparganum