Identification and characterization of a major surface antigen of Giardia lamblia (original) (raw)

Abstract

The surface antigens of Giardia lamblia trophozoites were characterized by crossed immunoelectrophoresis, radioiodination, and immunoprecipitation. Crossed immunoelectrophoretic analysis of trophozoites with hyperimmune rabbit anti-trophozoite antiserum revealed a prominent precipitin peak that disappeared upon adsorption of the antiserum with live or formaldehyde-fixed trophozoites. This peak was intensely labeled when the antigen was derived from surface-radioiodinated trophozoites. An antiserum monospecific for the antigen contained in this precipitin peak was prepared. The precipitin peak was shown to contain an antigen with an apparent molecular weight of 82,000 by Western blotting. The antiserum also detected this 82,000-molecular-weight antigen on nitrocellulose blots of trophozoites analyzed by sodium dodecyl sulfate-polyacrylamide gel electrophoresis. On radioiodination of live trophozoites, an iodinated molecule of 82,000 apparent molecular weight was resolved by sodium dodecyl sulfate-polyacrylamide gel electrophoresis and was immunoprecipitated by the monospecific antiserum. Preliminary characterization of this antigen with the monospecific antiserum in crossed immunoelectrophoresis revealed that the surface antigen is hydrophobic and thus may be anchored in the plasma membrane, and that it is heat sensitive, but only partially sensitive to pronase or periodate. This antigen was shared by the four G. lamblia strains examined.

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