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• W4221004839 abstract "The neonatal Fc receptor (FcRn) is responsible for the recycling of endocytosed albumin and IgG, and contributes to their long plasma half-life. We recently identified an FcRn-dependent recycling pathway from macropinosomes in macrophages; however, little is known about the dynamics of intracellular FcRn-ligand interactions to promote recycling. Here we demonstrate a multiplexed biophysical fluorescent microscopy approach to resolve the spatiotemporal dynamics of albumin-FcRn interactions in living bone marrow-derived macrophages (BMDMs). We used the phasor approach to fluorescence lifetime imaging microscopy (FLIM) of Förster resonance energy transfer (FRET) to detect the interaction of a FcRn-mCherry fusion protein with endocytosed Alexa Fluor 488-labeled human serum albumin (HSA-AF488) in BMDMs, and raster image correlation spectroscopy (RICS) analysis of single fluorescent-labeled albumin molecules to monitor the diffusion kinetics of internalized albumin. Our data identified a major fraction of immobile HSA-AF488 molecules in endosomal structures of human FcRn-positive mouse macrophages and an increase in FLIM-FRET following endocytosis, including detection of FRET in tubular-like structures. A nonbinding mutant of albumin showed minimum FLIM-FRET and high mobility. These data reveal the kinetics of FcRn-ligand binding within endosomal structures for recruitment into transport carriers for recycling. These approaches have wide applicability for analyses of intracellular ligand-receptor interactions." @default.
• W4221004839 created "2022-04-03" @default.
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• W4221004839 date "2022-01-01" @default.
• W4221004839 modified "2023-10-18" @default.
• W4221004839 title "Dynamics of intracellular neonatal Fc receptor–ligand interactions in primary macrophages using biophysical fluorescence techniques" @default.
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• W4221004839 doi "https://doi.org/10.1091/mbc.e21-02-0061" @default.
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