Molecular Cell
Volume 4, Issue 6, December 1999, Pages 893-902
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Article
Presenilin-1 Forms Complexes with the Cadherin/Catenin Cell–Cell Adhesion System and Is Recruited to Intercellular and Synaptic Contacts

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Abstract

In MDCK cells, presenilin-1 (PS1) accumulates at intercellular contacts where it colocalizes with components of the cadherin-based adherens junctions. PS1 fragments form complexes with E-cadherin, β-catenin, and α-catenin, all components of adherens junctions. In confluent MDCK cells, PS1 forms complexes with cell surface E-cadherin; disruption of Ca2+-dependent cell–cell contacts reduces surface PS1 and the levels of PS1-E-cadherin complexes. PS1 overexpression in human kidney cells enhances cell–cell adhesion. Together, these data show that PS1 incorporates into the cadherin/catenin adhesion system and regulates cell–cell adhesion. PS1 concentrates at intercellular contacts in epithelial tissue; in brain, it forms complexes with both E- and N-cadherin and concentrates at synaptic adhesions. That PS1 is a constituent of the cadherin/catenin complex makes that complex a potential target for PS1 FAD mutations.

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