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- W2012254242 abstract "Summary Complement (C) activation induced by Entamoeba histolytica in normal non-immune human serum was studied by testing in vitro the ability of different fractions of the trophozoites to cause C3 breakdown. Whole trophozoites were found to activate both alternative and classical C pathways. The antibody-independent classical pathway (MgEGTA inhibitable) C activating capacity was found to greatly increase after disruption of the cell membrane by sonication. Subsequent analysis after differential centrifugation and ion exchange chromatography of the membrane/particulate fractions showed, that this activity was not due to DNA, which has been shown to have the similar characteristics, but to other, as yet unidentified components. A rather homogenous membrane fraction obtained by elution with 0·4 M Tris-HCl, pH 8·1 (described as 4M) and some cytoplasmic constituents obtained after gel chromatography retained a moderate degree of alternative pathway C3 activating capacity seen with intact trophozoites. Thus, it seems, that serum contact to the outer surface of E. histolytica trophozoites leads to C activation via both pathways with cell death as the result and to subsequent release of more efficiently classical pathway activating components. These phenomena probably have an important role in the inflammatory process in invasive amoebiasis." @default.
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- W2012254242 date "1985-03-01" @default.
- W2012254242 modified "2023-09-26" @default.
- W2012254242 title "Complement activation by antigenic fractions of Entamoeba histolytica" @default.
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- W2012254242 doi "https://doi.org/10.1111/j.1365-3024.1985.tb00066.x" @default.
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