Glycosylation changes in different developmental stages of Trichinella |
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Authors: | Rositsa S. Milcheva Svetlozara L. Petkova Pavol Dubinsky Zuzana Hurniková Pavel Babál |
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Affiliation: | (1) Institute of Experimental Pathology and Parasitology, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., block 25, 1113 Sofia, Bulgaria;(2) Parasitological Institute, Slovak Academy of Sciences, Hlinkova 3, SK-04001 Košice, Slovakia;(3) Department of Pathology, Faculty of Medicine, Comenius University, Sasinkova 4, SK-81372 Bratislava, Slovakia |
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Abstract: | The in situ identification of carbohydrate structures in Trichinella spiralis intestinal larvae, adults and L1 muscular larvae was carried out by lectin histochemistry, with emphasis on the O-linked glycans. The absence of reactivity with two lectins-TML and MAL indicated that Trichinella spiralis does not synthesize sialic acid. Reactivity with HPA, VVL-B4, PNA and UEA-I staining suggested that T. spiralis synthesizes and expresses on its cuticle O-linked glycans analogous to Tn-antigen (GalNAc-α-Ser/Thr), T-antigen (Gal-β1,3-GalNAc-α-Ser/Thr) and also structures analogous to A-blood group antigens (GalNAc-α1,3-Gal-β1,3(4)-(Fuc-α1,2-)-R). Expression of the saccharidic moieties is stage-specific. Blood group-A and T-antigen structures were identified on the cuticle of the intestinal and muscular larvae. The Tn-antigen structure was missing in the intestinal larvae. Appropriate ligands for WGA were not identified in the adult individuals. The obtained results may contribute to a better understanding of the glycobiology of this parasitic nematode in relation to occupation of its intracellular niche. The presence of saccharidic structures analogous to some of those expressed on the intestinal epithelial cells may serve as a protective shield on the surface of the parasite. |
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Keywords: | Trichinella spiralis lectin histochemistry T-antigen Tn-antigen O-glycans |
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