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- W2028260018 abstract "Furin belongs to a family of seven closely related subtilisin-like serine endoproteases, known as proprotein convertases (PCs), PC1/3, PC2, PC4, PC5/6, PACE4 and PC7. The physiological role of furin is to cleave and hence activate a large variety of proproteins. Therefore, it is not surprising that it plays a major role in many pathologies such as cancer and infectious diseases. Furin inhibition might be a good strategy for therapeutic intervention, and several furin inhibitors have been generated, although thus far none are entirely furin-specific. To reduce potential side effects caused by cross-reactivity with other proteases, dromedary heavy chain antibodies against catalytically active furin were developed as specific furin inhibitors. Nanobodies derived from these antibodies bind only to mouse and human furin but not to other PCs. In addition, upon overexpression in cell lines, these nanobodies can inhibit the cleavage of three different furin substrates, TGFβ, BAFF and GPC3. The purified nanobodies can also inhibit the cleavage of diphtheria toxin into its enzymatically active A fragment, but do not inhibit cleavage of a small synthetic peptide-based substrate, suggesting a mode of action based on steric hindrance. The inhibitory constant of the purified nanobodies was shown to be in the micromolar range and the nanobodies are non-competitive inhibitors as demonstrated by Dixon plot. Furthermore, anti-furin nanobodies can protect HEK293T cells from diphtheria toxin-induced cytotoxicity as efficiently as the well characterized PC inhibitor nona-D-arginine. In conclusion, these antibody-based single-chain nanobodies represent the first generation of highly specific, non-competitive furin inhibitors. Citation Format: {Authors}. {Abstract title} [abstract]. In: Proceedings of the 103rd Annual Meeting of the American Association for Cancer Research; 2012 Mar 31-Apr 4; Chicago, IL. Philadelphia (PA): AACR; Cancer Res 2012;72(8 Suppl):Abstract nr 4627. doi:1538-7445.AM2012-4627" @default.
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- W2028260018 date "2012-04-15" @default.
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- W2028260018 title "Abstract 4627: Generation and characterization of non-competitive furin-inhibiting nanobodies" @default.
- W2028260018 doi "https://doi.org/10.1158/1538-7445.am2012-4627" @default.
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