Volume 40, Issue 6
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



In order to identify and characterize antigens in , we examined 19 murine monoclonal antibodies (Mabs) for specific binding to schistosome larvae. None of the murine Mabs induced by infection or by immunization with a crude cercarial antigen (CCA) served this purpose. Two Mabs out of 9 (KCSme22-3 and KCSme22-4) induced by soluble egg antigens reacted with CCA but not with normal snail (NSN) extract. We selected these 2 for studies on detection and characterization of schistosomal antigens in snails. When employed in an ELISA, they differentially detected schistosomal antigens in extracts and cell-free hemolymph (plasma) of infected snails. The selected Mabs bind to cercarial surface as demonstrated by the indirect fluorescent antibody technique (IFAT) with paraformaldehyde-fixed cercariae. The epitopes corresponding to the selected Mabs are periodate sensitive, suggesting the glycoprotein nature of the antigens recognized. Immunoblotting analysis employing the selected Mab revealed 1 antigen in CCA (M = 205 kDa) and 3 antigens in snail plasma (M = 220 kDa, 180 kDa, and 135 kDa). Schistosomal antigens were first detectable in the snails' plasma 2 weeks after snail infection, and their quantity increased afterwards.


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