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- W2002465493 abstract "SUMMARY We investigated the ability of six different pooled human immunoglobulin (PHIG) preparations to inhibit the binding of anti-myeloperoxidase (MPO) antibodies to MPO. All six PHIG preparations inhibited the binding of anti-MPO antibodies from six sera to MPO in a concentration-dependent manner in the concentration range 0·016 10 mg/ml. There was considerable variation in the ability of each PHIG preparation to inhibit the binding of anti-MPO antibody in a given serum. Further differences were seen in the ability of a given PHIG to inhibit anti-MPO binding in different sera. F(ab′)2: fragments from two PHIG preparations also inhibited in a concentration-dependent manner anti-MPO binding to MPO in all six sera in the concentration range 0·002 2·65 mg/ml, with a maximum inhibition of 42%. Little inhibition was seen with F(ab′)2 of normal human IgG from individual donors (1·8–12·2% al the maximum concentration of 2 mg/ml). F(ab′)2 fragments from three anti-MPO containing sera and two affinity-purified anti-MPO antibodies were eluted by affinity chromatography from Sepharose-bound PHIG F(ab′)2 and showed anti-MPO antibody activity. We have shown that PHIG and F(ab′)2 fragments of PHIG inhibit anti-MPO binding to MPO, and further that F(ab′)2 fragments of PHIG bind to F(ab′)2 fragments of anti-MPO antibodies. These observations indicate binding between the variable regions of PHIG and the antigen binding site of anti-MPO antibodies, and are consistent with an anti-idiotypic reaction. The variability seen in the inhibitory effect of the different PHIG preparations in anti-MPO-positive sera implies differences in their anti-idiotype content, while the variability of the inhibitory effect of a particular PHIG preparation between different sera suggests heterogeneity in the idiotypic repertoire of anti-MPO antibodies. Such variations in the inhibitory effect of different PHIG preparations on antibody binding may be an important determinant of their therapeutic effect." @default.
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- W2002465493 date "1994-02-01" @default.
- W2002465493 modified "2023-09-27" @default.
- W2002465493 title "Anti-idiotypic activity against anti-myeloperoxidase antibodies in pooled human immunoglobulin" @default.
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- W2002465493 doi "https://doi.org/10.1111/j.1365-2249.1994.tb06520.x" @default.
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