Abstract:
:Intact surface membrane vesicles were obtained and purified from the schistosomula of Schistosoma mansoni. The method of preparation of the vesicles involved treating the schistosomula in a buffered high salt medium for 1 h at 4 degrees C (Step 1), and then for 1 h at 25-37 degrees C (Step 2). Vesicles were formed from mechanically- and skin-transformed schistosomula, and their size and number depended on the temperature of Step 2. The majority of the vesicles expressed surface membrane concanavalin A receptors and parasite antigens on their outermost surfaces. When incubated with sensitized peripheral blood mononuclear cell preparations from humans exposed to schistosomal preparations, the vesicles stimulated lymphocyte transformation as effectively as soluble egg and adult worm antigens. Although both preparations contained identical proteins, small vesicles were less effective than large vesicles in stimulating lymphocyte transformation. Hence, vesicles prepared under a variety of conditions might be used to study those factors which influence the presentation of membrane-bound surface antigens to the immune system of the host.
journal_name
Parasitologyjournal_title
Parasitologyauthors
Kusel JR,Gazzinelli G,Colley DG,de Souza CP,Cordeiro MNdoi
10.1017/s0031182000056717subject
Has Abstractpub_date
1984-12-01 00:00:00pages
483-94eissn
0031-1820issn
1469-8161journal_volume
89 ( Pt 3)pub_type
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