Please use this identifier to cite or link to this item: https://doi.org/10.1038/nature07255
Title: FcRn-mediated antibody transport across epithelial cells revealed by electron tomography
Authors: He, W. 
Ladinsky, M.S.
Huey-Tubman, K.E.
Jensen, G.J.
McIntosh, J.R.
Björkman, P.J.
Issue Date: 25-Sep-2008
Citation: He, W., Ladinsky, M.S., Huey-Tubman, K.E., Jensen, G.J., McIntosh, J.R., Björkman, P.J. (2008-09-25). FcRn-mediated antibody transport across epithelial cells revealed by electron tomography. Nature 455 (7212) : 542-546. ScholarBank@NUS Repository. https://doi.org/10.1038/nature07255
Abstract: The neonatal Fc receptor (FcRn) transports maternal IgG across epithelial barriers, thereby providing the fetus or newborn with humoral immunity before its immune system is fully functional. In newborn rats, FcRn transfers IgG from milk to blood by apical-to-basolateral transcytosis across intestinal epithelial cells. The pH difference between the apical (pH 6.0-6.5) and basolateral (pH 7.4) sides of intestinal epithelial cells facilitates the efficient unidirectional transport of IgG, because FcRn binds IgG at pH 6.0-6.5 but not at pH 7 or more. As milk passes through the neonatal intestine, maternal IgG is removed by FcRn-expressing cells in the proximal small intestine (duodenum and jejunum); remaining proteins are absorbed and degraded by FcRn-negative cells in the distal small intestine (ileum). Here we use electron tomography to make jejunal transcytosis visible directly in space and time, developing new labelling and detection methods to map individual nanogold-labelled Fc within transport vesicles and simultaneously to characterize these vesicles by immunolabelling. Combining electron tomography with a non-perturbing endocytic label allowed us to conclusively identify receptor-bound ligands, resolve interconnecting vesicles, determine whether a vesicle was microtubule- associated, and accurately trace FcRn-mediated transport of IgG. Our results present a complex picture in which Fc moves through networks of entangled tubular and irregular vesicles, only some of which are microtubule-associated, as it migrates to the basolateral surface. New features of transcytosis are elucidated, including transport involving multivesicular body inner vesicles/tubules and exocytosis through clathrin-coated pits. Markers for early, late and recycling endosomes each labelled vesicles in different and overlapping morphological classes, revealing spatial complexity in endo-lysosomal trafficking. ©2008 Macmillan Publishers Limited. All rights reserved.
Source Title: Nature
URI: http://scholarbank.nus.edu.sg/handle/10635/100668
ISSN: 00280836
DOI: 10.1038/nature07255
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.

SCOPUSTM   
Citations

125
checked on Jan 24, 2022

WEB OF SCIENCETM
Citations

115
checked on Jan 24, 2022

Page view(s)

97
checked on Jan 27, 2022

Google ScholarTM

Check

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.