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- W1998530900 abstract "In patients with refractory infections, reliable markers that monitor the severity and healing process are needed. The expression level of toll-like receptor 2 (TLR2) on monocytes is such candidate. In the conventional assay system, the whole IgG (wIgG) form of anti-TLR2 mAb has been used with control IgG, which blocks nonantigen-specific bindings. However, the competitive reactions against Fcγ receptors (FcγRs) between labeled anti-TLR2 mAbs and control IgG should be considered. Our goal was to precisely quantify TLR2 expression level on monocytes by flow cytometry (FCM). In this study, we prepared anti-TLR2 mAbs, D45 (IgG2a), and D29 (IgG1), as well as their fragment antigen-binding [F(ab')(2) ] fragments to avoid nonantigen-specific binding to FcγRs. And then, we determined TLR2 expression levels on monocytes by using these mAbs/fragments and our calibration system using recombinant TLR2 beads. The binding of PE-labeled D45 wIgG to monocytes was completely blocked with unlabeled D45 wIgG, but not with unlabeled D45 F(ab')(2) fragment. Although the nonantigen-specific binding of D29 wIgG to nonstimulated monocytes was negligible, it was enhanced in interleukin-10-stimulated monocytes. It proved difficult to completely block nonantigen-specific binding of D45 and D29 wIgGs by treatment with control IgG. It was demonstrated that the use of fluorescent-labeled antigen-binding region lacking the fragment crystallizable portion of anti-TLR2 mAb [such as the PE-labeled F(ab')(2) fragment] is indispensible for quantification of TLR2 levels on monocytes in flow cytometry. ." @default.
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- W1998530900 date "2010-12-23" @default.
- W1998530900 modified "2023-10-10" @default.
- W1998530900 title "Reevaluation of quantitative flow cytometric analysis for TLR2 on monocytes using F(ab′)2 fragments of monoclonal antibodies" @default.
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- W1998530900 doi "https://doi.org/10.1002/cyto.a.21000" @default.
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