Differential p53-independent outcomes of p19(arf) loss in oncogenesis Journal Article
| Authors: | Chen, Z.; Carracedo, A.; Lin, H. K.; Koutcher, J. A.; Behrendt, N.; Egia, A.; Alimonti, A.; Carver, B. S.; Gerald, W.; Teruya-Feldstein, J.; Loda, M.; Pandolfi, P. P. |
| Article Title: | Differential p53-independent outcomes of p19(arf) loss in oncogenesis |
| Abstract: | One reported function of the tumor suppressor p19(Arf) is to stabilize p53, providing a critical checkpoint in the response to oncogenic insults. Acute loss of Pten leads to an increase in the abundance of p19 (Arf), p53, and p21 proteins as part of a fail-safe senescence response. Here, we report that loss of p19(Arf) in prostate epithelium does not accelerate-but rather partially inhibits-the prostate cancer phenotype of Pten-deficient mice. Moreover, cellular senescence and a further decrease in the number of pre-neoplastic glands were observed in prostates of the Pten-p19(Arf) double-mutant mice. In both prostate epithelium and primary mouse embryo fibroblasts (MEFs), the increase in p53 protein abundance found upon loss of Pten was unaffected by the simultaneous loss of p19 (Arf). However, in contrast to that in the prostate epithelium, p19(Arf) deficiency in MEFs lacking Pten abolished cell senescence and promoted hyperproliferation and transformation despite the unabated increase in p53 abundance. Consistent with the effect of p19(Arf) loss in Pten-deficientmouse prostate,we found that in human prostate cancers, loss of PTENwas not associated with loss of p14(ARF) (the human equivalent of mouse p19(Arf)). Collectively, these data reveal differential consequences of p19(Arf) inactivation in prostate cancer and MEFs upon Pten loss that are independent of the p53 pathway. Copyright 2008 by the American Association for the Advancement of Science; all rights reserved. |
| Keywords: | immunohistochemistry; controlled study; protein expression; genetics; histopathology; cancer growth; nonhuman; cell proliferation; animal cell; mouse; animal; cytology; metabolism; mouse mutant; animals; mice; mice, knockout; cells, cultured; mus; animal experiment; animal model; pathology; protein p53; carcinogenesis; prostate cancer; kaplan-meiers estimate; prostatic neoplasms; animal embryo; blotting, western; prostate; cell culture; prostate tumor; western blotting; phosphatidylinositol 3,4,5 trisphosphate 3 phosphatase; pten phosphohydrolase; fibroblast; fibroblasts; tumor suppressor protein p53; embryo, mammalian; senescence; arf protein; protein p19; cdkn1a protein, mouse; cdkn2a protein, mouse; cyclin dependent kinase inhibitor 1a; cyclin dependent kinase inhibitor 2a; pten protein, mouse; kaplan meier method; cyclin-dependent kinase inhibitor p16; cyclin-dependent kinase inhibitor p21; tumor suppressor protein p14arf |
| Journal Title: | Science Signaling |
| Volume: | 2 |
| Issue: | 84 |
| ISSN: | 1945-0877 |
| Publisher: | American Association for the Advancement of Science |
| Date Published: | 2009-08-18 |
| Start Page: | ra44 |
| Language: | English |
| DOI: | 10.1126/scisignal.2000053 |
| PUBMED: | 19690330 |
| PROVIDER: | scopus |
| PMCID: | PMC2928478 |
| DOI/URL: | |
| Notes: | --- - "Cited By (since 1996): 6" - "Export Date: 30 November 2010" - "Source: Scopus" |
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