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Fasciola hepatica and Schistosoma mansoni: immunofluorescent antigen localization and cross-reactivity.

Abstract：

:In an attempt to identify the tissue sources of biochemically purified antigenic fractions of Fasciola hepatica and Schistosoma mansoni, antisera were tested against plastic-embedded sections of worms of various ages by an indirect fluorescent-antibody-labeling technique. Antibodies prepared against antigens purified by chromatography of F. hepatica whole worm extract through concanavalin A-Sepharose 4B labeled the parenchyma and tegument of adult F. hepatica strongly while antibodies developed against antigens purified by antibody-affinity chromatography against antibodies of S. mansoni labeled only the parenchyma. Antigens common to these two groups clearly originated from F. hepatica parenchyma. Certain of these common antigens are known to provide significant protection in mice to challenge with S. mansoni cercariae, and in the present study antisera against F. hepatica extracts cross-labeled S. mansoni adult male parenchyma. Reciprocal cross-reactions between antisera against S. mansoni and the parenchyma of adult F. hepatica were also noted. FhFIIb, an extract of F. hepatica which Tailliez described as not cross-reacting with S. mansoni, was found to contain no F. hepatica parenchymal antigens. Antigenic fractions of F. hepatica and S. mansoni collected from the surface of worms after incubation in nonionic detergent were unexpectedly found to contain much parenchymal antigen, suggesting leakage of internal components into the supernatant during preparation. Antisera to F. hepatica developed during a natural infection in rabbits labeled tegumental components and gut strongly but did not react with parenchymal tissue. Antisera against extracts of adult schistosomes labeled the parenchyma of male worms and the glycocalyx of the cercarial tegument, indicating the presence of common antigens in the adult and the cercarial stage. Reciprocal reactions between anticercarial sera and adult sections provided further evidence of shared antigenicity. Antisera against S. mansoni egg antigens strongly labeled sections of eggs in liver tissue and cross-reacted with cercarial glycocalyx, indicating the existence of common antigens between these two stages. The antisera also cross-reacted with what appeared to be non-membrane-bound protein in the tegument of F. hepatica. The soluble egg antigen extract shared antigenicity with the parenchyma of both S. mansoni and F. hepatica but circumoval precipitin had no cross-reactivity with this tissue. Thus S. mansoni eggs contain nondiffusable components sharing antigenic specificity with adult parenchymal tissue.(ABSTRACT TRUNCATED AT 400 WORDS)

journal_name

Exp Parasitol

journal_title

Experimental parasitology

authors

Hanna RE,Hillyer GV

doi

10.1016/0014-4894(84)90055-9

subject

Has Abstract

pub_date

1984-02-01 00:00:00

pages

1-14

issue

1

eissn

0014-4894

issn

1090-2449

pii

0014-4894(84)90055-9

journal_volume

57

pub_type

杂志文章

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