Polarized expression of HD1: relationship with the cytoskeleton in cultured human colonic carcinoma cells.

Abstract	Hemidesmosomes (HDs) mediate adhesion of epithelial cells to the extracellular matrix and have morphological associations with intermediate-size filaments (IFs). Hemidesmosomal molecular components including HD1, the two bullous pemphigoid antigens, and the integrin alpha 6 beta 4 have been identified in HDs of stratified and complex epithelium. In this study, we report that HT29-Fu cells, a human colonic tumor cell line, express two hemidesmosomal components (HD1, alpha 6 beta 4) associated in an adhesion structure termed type II HDs. Immunofluorescence studies showed a colocalization of HD1 and alpha 6 beta 4 in basal patches between actin stress fibers. Using cytochalasin B or vinblastine, two drugs which disrupt the cytoskeleton, we demonstrate that the redistribution of HD1 was probably induced by the reorganization of the basal cytokeratin network. We also show that in vitro HD1 binds to polymerized cytokeratin intermediate filaments; this suggests that HD1 in intestinal epithelial cells functions as a linker protein connecting cytokeratin filaments to the basal plasma membrane, probably through the beta 4 subunit of the integrin alpha 6 beta 4.
Authors	L Fontao, S Dirrig, K Owaribe, M Kedinger, J F Launay
Journal	Experimental cell research (Exp Cell Res) Vol. 231 Issue 2 Pg. 319-27 (Mar 15 1997) ISSN: 0014-4827 [Print] United States
PMID	9087173 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
Chemical References	Actins Homeodomain Proteins Intermediate Filament Proteins Neoplasm Proteins Cytochalasin B Vinblastine Keratins
Topics	Actins (analysis) Adenocarcinoma (metabolism, pathology) Cell Adhesion Cell Differentiation Cell Polarity Colonic Neoplasms (metabolism, pathology) Cytochalasin B (pharmacology) Cytoskeleton (drug effects, metabolism) Gene Expression Regulation, Neoplastic Homeodomain Proteins (biosynthesis, genetics) Humans Intermediate Filament Proteins (biosynthesis, genetics) Intermediate Filaments (metabolism) Keratins (metabolism) Neoplasm Proteins (biosynthesis, genetics) Organelles (metabolism, ultrastructure) Tumor Cells, Cultured (drug effects) Vinblastine (pharmacology)

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