Abstract：
:Using alternative reading frames, the human ARF-INK4a locus encodes two unrelated proteins that both function in tumor suppression. p16(INK4a) maintains the retinoblastoma protein in its growth-suppressive state through inhibition of cyclin D-dependent kinase activity, whereas ARF binds with MDM2 and stabilizes p53. The majority of the activity of ARF to date is ascribed to its ability to activate p53, resulting in a G(1) cell cycle arrest or apoptosis. We show here that ARF colocalizes with DNA replication protein A (RPA32) and that overexpression of ARF reduces the rate of DNA synthesis resulting in accumulation of an S-phase cell population. Impediment of DNA synthesis by ARF can occur and becomes more evident in the absence of p53. Hence, the biological consequence of ARF induction varies dependent on cellular p53 status, inducing predominantly a G(1) arrest or apoptosis in p53-positive cells or causing S-phase retardation when p53 function is comprised.
journal_name
Cancer Resjournal_title
Cancer researchauthors
Yarbrough WG,Bessho M,Zanation A,Bisi JE,Xiong Ysubject
Has Abstractpub_date
2002-02-15 00:00:00pages
1171-7issue
4eissn
0008-5472issn
1538-7445journal_volume
62pub_type
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