Tumor suppressor VDUP1 increases p27kip1 stability by inhibiting JAB1

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Title
Tumor suppressor VDUP1 increases p27kip1 stability by inhibiting JAB1
Author(s)
Jun Ho Jeon; Kee Nyung Lee; Chae Young Hwang; Ki Sun Kwon; K H You; In Pyo Choi
Bibliographic Citation
Cancer Research, vol. 65, no. 11, pp. 4485-4489
Publication Year
2005
Abstract
Vitamin D3 up-regulated protein 1 (VDUP1) is a stress-response gene that is up-regulated by 1,25(OH)3D3 in many cells. It has been reported that VDUP1 expression is reduced in many tumor cells and the enforced expression of VDUP1 inhibits cell proliferation by arresting cell cycle progression. Here, we found that VDUP1-/- fibroblast cells proliferated more rapidly compared with wild-type cells with reduced expression of p27kip1, a cyclin-dependent kinase inhibitor. JAB1 is known to interact with p27kip1 and to decrease the stability of p27 kip1. VDUP1 interacted with JAB1 and restored JAB1-induced suppression of p27kip1 stability. In this process, VDUP1 blocked the JAB1-mediated translocation of p27kip1 from the nucleus to the cytoplasm. In addition, VDUP1 inhibited JAB1-mediated activator protein-1 activation and cell proliferation. Taken together, these results indicate that VDUP1 is a novel factor of p27kip1 stability via regulating JAB1.
ISSN
0008-5472
Publisher
Amer Assoc Cancer Research
DOI
http://dx.doi.org/10.1158/0008-5472.CAN-04-2271
Type
Article
Appears in Collections:
Division of Research on National Challenges > Aging Research Center > 1. Journal Articles
Division of Biomedical Research > Immunotherapy Research Center > 1. Journal Articles
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