Journal
ONCOGENE
Volume 26, Issue 44, Pages 6396-6405Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/sj.onc.1210469
Keywords
Gadd45a; cell-cell adhesion; cell contact; inhibition; beta-catenin
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Gadd45a, a growth arrest and DNA-damage gene, plays important roles in the control of cell cycle checkpoints, DNA repair and apoptosis. We show here that Gadd45a is involved in the control of cell contact inhibition and cell cell adhesion. Gadd45a can serve as an adapter to enhance the interaction between beta-catenin and Caveolin-1, and in turn induces beta-catenin translocation to cell membrane for maintaining cell - cell adhesion/contact inhibition. This is coupled with reduction of b-catenin in cytoplasm and nucleus following Gadd45a induction, which is reflected by the downregulation of cyclin D1, one of the beta-catenin targeted genes. Additionally, Gadd45a facilitates ultraviolet radiation-induced degradation of cytoplasmic and nuclear beta-catenin in a p53-dependent manner via activation of p38 kinase. These findings define a novel link that connects Gadd45a to cell - cell adhesion and cell contact inhibition, which might contribute to the role of Gadd45a in inhibiting tumorigenesis.
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