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The ultrastructural organization of endoplasmic reticulum-plasma membrane contacts is conserved in epithelial cells

Chung, Gary Hong Chun; Lorvellec, Maëlle; Gissen, Paul; Pichaud, Franck; Burden, Jemima J; Stefan, Christopher J; (2022) The ultrastructural organization of endoplasmic reticulum-plasma membrane contacts is conserved in epithelial cells. Molecular Biology of the Cell 10.1091/mbc.E21-11-0534-T. (In press). Green open access

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Abstract

Contacts between the endoplasmic reticulum and plasma membrane (ER-PM contacts) have important roles in membrane lipid and calcium dynamics. Yet, their organization in polarized epithelial cells has not been thoroughly described. Here, we examine ER-PM contacts in hepatocytes in mouse liver using electron microscopy, providing the first comprehensive ultrastructural study of ER-PM contacts in a mammalian epithelial tissue. Our quantitative analyses reveal strikingly distinct ER-PM contact architectures spatially linked to apical, lateral, and basal PM domains. Notably, we find that an extensive network of ER-PM contacts exists at lateral PM domains that form inter-cellular junctions between hepatocytes. Moreover, the spatial organization of ER-PM contacts is conserved in epithelial spheroids, suggesting that ER-PM contacts may serve conserved roles in epithelial cell architecture. Consistent with this notion, we show that ORP5 activity at ER-PM contacts modulates apical-basolateral aspect ratio in HepG2 cells. Thus, ER-PM contacts have a conserved distribution and crucial roles in PM domain architecture across epithelial cell types. [Media: see text] [Media: see text] [Media: see text] [Media: see text] [Media: see text].

Type: Article
Title: The ultrastructural organization of endoplasmic reticulum-plasma membrane contacts is conserved in epithelial cells
Location: United States
Open access status: An open access version is available from UCL Discovery
DOI: 10.1091/mbc.E21-11-0534-T
Publisher version: https://doi.org/10.1091/mbc.E21-11-0534-T
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: apical domain, basal domain, bile canaliculi, cell-cell junctions, endoplasmic reticulum-plasma membrane contacts, epithelial cells, hepatocytes, lateral domain, xysterolbinding protein related proteins
UCL classification: UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Lab for Molecular Cell Bio MRC-UCL
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Population Health Sciences > UCL GOS Institute of Child Health > Genetics and Genomic Medicine Dept
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Population Health Sciences > UCL GOS Institute of Child Health
URI: https://discovery.ucl.ac.uk/id/eprint/10153951
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