Surface labelling of Strongyloides ratti: stage-specificity and cross-reactivity with S. stercoralis

Various methods of radioiodination were compared for their efficacy in labelling the surface of Strongyloides ratti infective larvae and adult worms. The Iodogen method was chosen as the optimal technique for this parasite. The surface location of 125-iodine was confirmed with light microscope autor...

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Bibliographic Details
Published in:Clinical and experimental immunology 1989-03, Vol.75 (3), p.487-492
Main Authors: NORTHERN, C, GROVE, D. I, WARTON, A, LOVEGROVE, F. T
Format: Article
Language:English
Subjects:
Animals
Antigens, Helminth - analysis
Antigens, Surface - analysis
Biochemistry. Physiology. Immunology. Molecular biology
Biological and medical sciences
Cross Reactions
Electrophoresis, Polyacrylamide Gel
Epitopes - analysis
Fundamental and applied biological sciences. Psychology
Invertebrates
Larva - immunology
Nemathelminthia. Plathelmintha
Physiology. Development
Precipitin Tests
Strongyloides - growth & development
Strongyloides - immunology
Strongyloides stercoralis
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Summary:Various methods of radioiodination were compared for their efficacy in labelling the surface of Strongyloides ratti infective larvae and adult worms. The Iodogen method was chosen as the optimal technique for this parasite. The surface location of 125-iodine was confirmed with light microscope autoradiography of transverse sections of labelled worms. Stage-specific surface components were identified when the sodium dodecyl sulphate polyacrylamide gel electrophoresis (SDS-PAGE) profiles of infective larvae and adult worms were compared. Labelled surface molecules were solubilized with either the non-ionic detergent Triton-X-100, the anionic detergents sodium deoxycholate (DOC) or sodium dodecyl sulphate (SDS), or the cationic detergent cetyl trimethyl-ammonium bromide (CTAB). The CTAB extract yielded most labelled proteins that retained their antigenicity in an immunoprecipitation assay with hyperimmune mouse sera. Immunoprecipitation analysis with stage-specific mouse sera revealed that the surface of infective larvae is immunogenic and that there are no cross-reactions with adult worms. Adult worms resident in the intestine were not found to be immunogenic and showed a complete absence of reactivity. Antigenic determinants shared between S. ratti and S. stercoralis were identified. Patients infected with S. stercoralis precipitated bands with molecular weights 32 and 34 kD which were not reactive with normal sera. These reactions suggest the potential usefulness of the surface of S. ratti as a source of diagnostic antigens.
ISSN:0009-9104
1365-2249