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- W2318380068 abstract "A panel of six different murine hybridoma clones secreting IgG monoclonal antibodies (MAbs) specific for the human IgM Fc receptor (FcμR) was generated. All MAbs specifically precipitated a major protein of ∼60 kDa from membrane lysates of FcμR-bearing, but not FcμR-negative, cells as did IgM-ligands. Pre-incubation of membrane lysate of FcμR-bearing cells with these MAbs completely removed the ∼60 kDa IgM-reactive protein. By using recombinant human/mouse chimeric FcμR proteins, the epitope recognized by HM7 and HM10 MAbs was mapped to the Ig-like domain of human FcμR, whereas the other MAbs recognized the stalk region. Pre-incubation of FcμR+ cells with the Ig-like domain-specific MAbs, but not with others, markedly inhibited subsequent IgM-ligand binding. A similar, but much weaker, inhibition was also observed when the incubation order was reversed. When FcμR+ cells were simultaneously incubated with both IgM-ligands and MAbs, HM7 MAb efficiently competed with IgM for FcμR binding. Unlike control Jurkat cells, FcμR-bearing cells were resistant to apoptosis induced by agonistic IgM anti-Fas MAb (CH11); however, addition of the HM7 MAb inhibited the interaction of the Fc portion of CH11 MAb with FcμR, thereby promoting apoptosis of FcμR-bearing Jurkat cells. The variable regions of the HM7 MAb were composed of Ighv14-3, Ighd1-2, and Ighj2 for the γ2b heavy chain and Igk3-4 and Igkj2 for the κ light chain. These findings suggest that HM7 MAb efficiently blocks the ligand-binding activity of FcμR." @default.
- W2318380068 created "2016-06-24" @default.
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- W2318380068 date "2014-12-01" @default.
- W2318380068 modified "2023-10-16" @default.
- W2318380068 title "Monoclonal Antibodies Specific for Human IgM Fc Receptor Inhibit Ligand-binding Activity" @default.
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- W2318380068 doi "https://doi.org/10.1089/mab.2014.0053" @default.
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