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Tegumental surface modulation in Schistosoma mansoni primary sporocysts in response to ligand binding
Author(s) -
DUNN TERRY S.,
YOSHINO TIMOTHY P.
Publication year - 1991
Publication title -
parasite immunology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.795
H-Index - 75
eISSN - 1365-3024
pISSN - 0141-9838
DOI - 10.1111/j.1365-3024.1991.tb00269.x
Subject(s) - biology , schistosoma mansoni , viral tegument , monoclonal antibody , antibody , epitope , ligand (biochemistry) , microbiology and biotechnology , immunology , receptor , biomphalaria glabrata , trematoda , in vitro , immune system , primary and secondary antibodies , schistosomiasis , biochemistry , virology , helminths
Summary The clearance of host molecules from the surface of a parasite constitutes a potential immune evasive strategy. The possibility that certain ligands. when bound to the tegument of Schistosoma mansoni primary sporocysts, could induce such a modulating effect was investigated. Live, in vitro cultured primary sporocysts were first treated with either snail host Biomphataria glabrata plasma, an anti‐sporocyst monoclonal antibody (MoAb III‐1), or concanavalin A (con A). The capacity of these primary ligands to produce a modulating effect alone, or when subsequently crosslinked by secondary or tertiary ligands, was measured using quantitative fluorescence microscopy. Snail plasma alone, or plasma crosslinked at the sporocyst surface with a mouse anti‐plasma MoAb had little or no modulating effect. However, a tertiary level of ligand crosslinking with an anti‐mouse IgG antibody produced an average 1.8‐fold decrease in surface fluorescence within 1 h post‐labelling. The anti‐sporocyst MoAb III‐1 also required secondary antibody reactivity to induce an average 1.5‐fold decrease in MoAb III‐1 recognized epitopes. Sporocysts labelled wilh con A crosslinkcd by secondary and tertiary ligands showed inconsistent modulation, with a 1.5‐fold decrease in fluorescence in one out of three replicates. Overall, however, analysis of combined data revealed no significant effect of tertiary ligand level crosslinkage on modulation of con A‐tegumental receptor complexes. In contrast, con A binding alone to tegumental determinants induced a small, but significant, reduction in surface con A complexes. Modulation of ligand‐receptor complexes on the sporocyst tegumental membrane appears to be an energy‐requiring event, since clearance of surface complexes was inhibited in the presence of sodium azidc and/or sodium iodoacetate, or when larvae were incubated at 4°C. It is concluded that alterations in sporocysl tegumenlal surface components may be triggered by specific (but as yet undefined) signals. Sporocysts are capable of exhibiting different responses depending on the nature of the binding signal and reactive tegumental receptor, and the degree of ligand crosslinkage.