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Identification and characterization of a polysaccharide-containing antigen from Schistosoma mansoni eggs which cross-reacts with the surface of schistosomula

  • D. W. Dunne (a1) and Q. D. Bickle (a1)


Antisera were produced by immunizing rabbits with either a trichloroacetic acid-soluble fraction, or a high molecular weight (Mr) fraction of Schistosoma mansoni SEA (a salinesoluble fraction of homogenized egg). Both of these sera reacted monospecifically in immunoelectrophoresis against unfractionated SEA, recognizing a cathodally migrating antigen. This antigen had been identified previously as being responded to by S. mansoni-infected mouse sera, and has been designated K3 (Kappa 3). The rabbit antisera were used to partially characterize antigen K3 as having Mr in the range > 750 – 70 K, and being resistant to boiling, resistant to the action of proteases, but sensitive to periodate. It partially binds to Concanavalin A. In addition to SEA, the antigen was present in homogenized cercariae and schistosomula, but not adult worms, and it was also present in detergent extracts of intact cercariae and schistosomula. Using an antibody-dependent cell adherence assay, anti-K3 serum was found to react with the surface of live cercariae and with the surface of schistosomula recovered from the skin of mice infected up to 48 h previously. Anti-K3 serum also reacted with the surface of S. bovis, S. haematobium and to a lesser extent S. japonicum schistosomula.



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Identification and characterization of a polysaccharide-containing antigen from Schistosoma mansoni eggs which cross-reacts with the surface of schistosomula

  • D. W. Dunne (a1) and Q. D. Bickle (a1)


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