The zonula adherens matura redefines the apical junction of intestinal epithelia.
Proc Natl Acad Sci U S A
; 121(9): e2316722121, 2024 Feb 27.
Article
en En
| MEDLINE
| ID: mdl-38377188
ABSTRACT
Cell-cell apical junctions of epithelia consist of multiprotein complexes that organize as belts regulating cell-cell adhesion, permeability, and mechanical tension the tight junction (zonula occludens), the zonula adherens (ZA), and the macula adherens. The prevailing dogma is that at the ZA, E-cadherin and catenins are lined with F-actin bundles that support and transmit mechanical tension between cells. Using super-resolution microscopy on human intestinal biopsies and Caco-2 cells, we show that two distinct multiprotein belts are basal of the tight junctions as the intestinal epithelia mature. The most apical is populated with nectins/afadin and lined with F-actin; the second is populated with E-cad/catenins. We name this dual-belt architecture the zonula adherens matura. We find that the apical contraction apparatus and the dual-belt organization rely on afadin expression. Our study provides a revised description of epithelial cell-cell junctions and identifies a module regulating the mechanics of epithelia.
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MEDLINE
Asunto principal:
Actinas
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Uniones Adherentes
Límite:
Humans
Idioma:
En
Año:
2024
Tipo del documento:
Article