Transmembrane Protein PERP is a Component of Tessellate Junctions and of Other Junctional and Non-junctional Plasma Membrane Regions in Diverse Epithelial and Epithelium-derived Cells

Overview

Journal Cell Tissue Res

Specialties Anatomy & Histology
Cell Biology

Date 2013 May 22

PMID 23689684

Citations 11

Authors

Werner W Franke

Hans Heid

Ralf Zimbelmann

Caecilia Kuhn

Stefanie Winter-Simanowski

Yvette Dorflinger

Christine Grund

Steffen Rickelt

Affiliations

Soon will be listed here.

Abstract

Protein PERP (p53 apoptosis effector related to PMP-22) is a small (21.4 kDa) transmembrane polypeptide with an amino acid sequence indicative of a tetraspanin character. It is enriched in the plasma membrane and apparently contributes to cell-cell contacts. Hitherto, it has been reported to be exclusively a component of desmosomes of some stratified epithelia. However, by using a series of newly generated mono- and polyclonal antibodies, we show that protein PERP is not only present in all kinds of stratified epithelia but also occurs in simple, columnar, complex and transitional epithelia, in various types of squamous metaplasia and epithelium-derived tumors, in diverse epithelium-derived cell cultures and in myocardial tissue. Immunofluorescence and immunoelectron microscopy allow us to localize PERP predominantly in small intradesmosomal locations and in variously sized, junction-like peri- and interdesmosomal regions ("tessellate junctions"), mostly in mosaic or amalgamated combinations with other molecules believed, to date, to be exclusive components of tight and adherens junctions. In the heart, PERP is a major component of the composite junctions of the intercalated disks connecting cardiomyocytes. Finally, protein PERP is a cobblestone-like general component of special plasma membrane regions such as the bile canaliculi of liver and subapical-to-lateral zones of diverse columnar epithelia and upper urothelial cell layers. We discuss possible organizational and architectonic functions of protein PERP and its potential value as an immunohistochemical diagnostic marker.

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