title: Cellular levels of p120 catenin function as a set point for cadherin expression levels in microvascular endothelial cells.
abstract: The mechanisms by which catenins regulate cadherin function are not fully understood, and the precise function of p120 catenin (p120ctn) has remained particularly elusive. In microvascular endothelial cells, p120ctn colocalized extensively with cell surface VE-cadherin, but failed to colocalize with VE-cadherin that had entered intracellular degradative compartments. To test the possibility that p120ctn binding to VE-cadherin regulates VE-cadherin internalization, a series of approaches were undertaken to manipulate p120ctn availability to endogenous VE-cadherin. Expression of VE-cadherin mutants that competed for p120ctn binding triggered the degradation of endogenous VE-cadherin. Similarly, reducing levels of p120ctn using siRNA caused a dramatic and dose-related reduction in cellular levels of VE-cadherin. In contrast, overexpression of p120ctn increased VE-cadherin cell surface levels and inhibited entry of cell surface VE-cadherin into degradative compartments. These results demonstrate that cellular levels of p120ctn function as a set point mechanism that regulates cadherin expression levels, and that a major function of p120ctn is to control cadherin internalization and degradation.
authors: Department of Dermatology, School of Medicine, Emory University, Atlanta, GA 30322, USA.
authors: Kanyan
authors: K
authors: Xiao
authors: David F
authors: DF
authors: Allison
authors: Kathleen M
authors: KM
authors: Buckley
authors: Margaret D
authors: MD
authors: Kottke
authors: Peter A
authors: PA
authors: Vincent
authors: Victor
authors: V
authors: Faundez
authors: Andrew P
authors: AP
authors: Kowalczyk
mesh_terms: D015703:Antigens, CD; D015820:Cadherins / Q000235:genetics / Q000378:metabolism*; D051177:Catenins; D002448:Cell Adhesion / Q000235:genetics*; D015815:Cell Adhesion Molecules / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism*; D002460:Cell Line; D004705:Endocytosis / Q000235:genetics; D004730:Endothelium, Vascular / Q000378:metabolism*; D025461:Feedback, Physiological / Q000235:genetics; D006801:Humans; D009154:Mutation / Q000235:genetics; D010750:Phosphoproteins / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism*; D011485:Protein Binding / Q000187:drug effects / Q000235:genetics; D021381:Protein Transport / Q000235:genetics*; D034741:RNA, Small Interfering / Q000494:pharmacology; D000095002:Delta Catenin; D000099152:Cadherin 5
chemical_list: D015703:Antigens, CD; D015820:Cadherins; D051177:Catenins; D015815:Cell Adhesion Molecules; D010750:Phosphoproteins; D034741:RNA, Small Interfering; D000095002:Delta Catenin; D000099152:Cadherin 5; C000722347:CTNND1 protein, human