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-catenin
1 Departments of Dermatology, Cell Biology, and Emory Skin Diseases Research Center, Emory University School of Medicine, Atlanta, Georgia 30322; and 2 Center for Cardiovascular Sciences and 3 Center for Cell Biology and Cancer Research, Albany Medical College, Albany, New York 12208
VE-cadherin is an
endothelial-specific cadherin that plays a central role in vascular
barrier function and angiogenesis. The cytoplasmic domain of
VE-cadherin is linked to the cytoskeleton through interactions with the
armadillo family proteins
-catenin and plakoglobin. Growing evidence
indicates that
-catenin and plakoglobin play important roles
in epithelial growth and morphogenesis. To test the role of these
proteins in vascular cells, a replication-deficient retroviral system
was used to express intercellular junction proteins and mutants in the
human dermal microvascular endothelial cell line (HMEC-1). A mutant
VE-cadherin lacking an adhesive extracellular domain disrupted
endothelial barrier function and inhibited endothelial growth. In
contrast, expression of exogenous plakoglobin or metabolically stable
mutants of
-catenin stimulated HMEC-1 cell growth, which suggests
that the
-catenin signaling pathway was active in HMEC-1 cells. This
possibility was supported by the finding that a dominant-negative mutant of the transcription factor TCF-4, designed to inhibit
-catenin signaling, also inhibited HMEC-1 cell growth. These observations suggest that intercellular junction proteins function as
components of an adhesion and signaling system that regulates vascular
barrier function and growth.
adherens junction; angiogenesis; Wnt signaling
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