Perturbation of the Tight Junction Permeability Barrier by Occludin Loop Peptides Activates Beta-catenin/TCF/LEF-mediated Transcription

Overview

Journal EMBO Rep

Specialty Molecular Biology

Date 2001 Apr 18

PMID 11306551

Citations 19

Authors

I Vietor

T Bader

K Paiha

L A Huber

Affiliations

Soon will be listed here.

Abstract

Here we show that interference with the integrity of the transepithelial permeability barrier of mouse mammary epithelial cells by treatment with synthetic peptides, homologous to the second extracellular domain of occludin, decreased the amount of occludin protein present at tight junctions and led to the formation of multilayered, unpolarized cell clusters. In addition, transcription of the adherens junction protein beta-catenin was induced. Following accumulation of soluble beta-catenin protein, transcription by beta-catenin/TCF/LEF was increased, as revealed by transcriptional assays following transient transfection of the reporter construct. Furthermore, treatment with occludin-II peptides up-regulated RNA levels of the known beta-catenin/TCF/LEF downstream target gene c-myc. The data presented imply a functional cross-talk between tight and adherens junctions that possibly contributes to the stepwise transformation during oncogenesis.

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