File:FcRn mechanism of inhibition-en.svg

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English: Simplified schematic illustration of the proposed mechanism of action of FcRn inhibitors, modified after D.D. Patel, J.B. Bussel: Neonatal Fc receptor in human immunity: Function and role in therapeutic intervention. Journal of Allergy and Clinical Immunology, 146(3), 2020, 467–478, doi:10.1016/j.jaci.2020.07.015.
Left: IgG molecules enter cells by pinocytosis (1) and are taken up into endosomes containing neonatal Fc receptors (FcRn) (2). Because of the acidic pH in the endosomes, the FcRn binds tightly to the Fc portion of IgG. Sorting follows (3): unbound (excess) IgG is submitted to lysosomes (4) where it is degraded. Bound IgG molecules are retained (5) and transported out of the cell by exocytosis (6). In the physiological (near neutral) pH of the blood, the FcRn releases the IgG (7). Right: FcRn inhibitors bind to the FcRn with greater affinity than endogenous IgG and thus compete with endogenous IgG for FcRn binding. As a result, more endogenous IgG molecules are targeted to lysosomal degradation and fewer are recycled.
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Author Benff
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current12:31, 19 January 2023Thumbnail for version as of 12:31, 19 January 20231,140 × 532 (109 KB)Polarlys (talk | contribs)=={{int:filedesc}}== {{Information |description={{en|1=Simplified schematic illustration of the proposed mechanism of action of FcRn inhibitors, modified after D.D. Patel, J.B. Bussel: ''Neonatal Fc receptor in human immunity: Function and role in therapeutic intervention.'' Journal of Allergy and Clinical Immunology, 146(3), 2020, 467–478, doi:10.1016/j.jaci.2020.07.015.<br /> ''Left:'' IgG molecules enter cells by pinocytosis ('''1''') and are taken up into endosomes containing neonatal Fc...

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