TY - JOUR
T1 - Crucial role of p53-dependent cellular senescence in suppression of Pten-deficient tumorigenesis
AU - Chen, Zhenbang
AU - Trotman, Lloyd C.
AU - Shaffer, David
AU - Lin, Hui Kuan
AU - Dotan, Zohar A.
AU - Niki, Masaru
AU - Koutcher, Jason A.
AU - Scher, Howard I.
AU - Ludwig, Thomas
AU - Gerald, William
AU - Cordon-Cardo, Carlos
AU - Pandolfi, Pier Paolo
N1 - Funding Information:
Acknowledgements We thank T. Maeda and T. Jacks for helpful suggestions; D. Peeper, C. Schmitt and M. Serrano for exchanging unpublished data and coordinating the submission of manuscripts; N. Hay, U. Greber and S. Hemmi for reagents; L. Cai and L. DiSantis for critical reading and editing of the manuscript; other members of the Pandolfi lab for advice and discussion; K. Manova and C. Farrell from the Molecular Cytology Core Facility for assistance with IHC analysis; and C. Le, C. Matei, D. Procissi and I. Buchanan for MRI analysis. This work was supported by NIH grants to P.P.P.
PY - 2005/8/4
Y1 - 2005/8/4
N2 - Cellular senescence has been theorized to oppose neoplastic transformation triggered by activation of oncogenic pathways in vitro, but the relevance of senescence in vivo has not been established. The PTEN and p53 tumour suppressors are among the most commonly inactivated or mutated genes in human cancer including prostate cancer. Although they are functionally distinct, reciprocal cooperation has been proposed, as PTEN is thought to regulate p53 stability, and p53 to enhance PTEN transcription. Here we show that conditional inactivation of Trp53 in the mouse prostate fails to produce a tumour phenotype, whereas complete Pten inactivation in the prostate triggers nonlethal invasive prostate cancer after long latency. Strikingly, combined inactivation of Pten and Trp53 elicits invasive prostate cancer as early as 2 weeks after puberty and is invariably lethal by 7 months of age. Importantly, acute Pten inactivation induces growth arrest through the p53-dependent cellular senescence pathway both in vitro and in vivo, which can be fully rescued by combined loss of Trp53. Furthermore, we detected evidence of cellular senescence in specimens from early-stage human prostate cancer. Our results demonstrate the relevance of cellular senescence in restricting tumorigenesis in vivo and support a model for cooperative tumour suppression in which p53 is an essential failsafe protein of Pten-deficient tumours.
AB - Cellular senescence has been theorized to oppose neoplastic transformation triggered by activation of oncogenic pathways in vitro, but the relevance of senescence in vivo has not been established. The PTEN and p53 tumour suppressors are among the most commonly inactivated or mutated genes in human cancer including prostate cancer. Although they are functionally distinct, reciprocal cooperation has been proposed, as PTEN is thought to regulate p53 stability, and p53 to enhance PTEN transcription. Here we show that conditional inactivation of Trp53 in the mouse prostate fails to produce a tumour phenotype, whereas complete Pten inactivation in the prostate triggers nonlethal invasive prostate cancer after long latency. Strikingly, combined inactivation of Pten and Trp53 elicits invasive prostate cancer as early as 2 weeks after puberty and is invariably lethal by 7 months of age. Importantly, acute Pten inactivation induces growth arrest through the p53-dependent cellular senescence pathway both in vitro and in vivo, which can be fully rescued by combined loss of Trp53. Furthermore, we detected evidence of cellular senescence in specimens from early-stage human prostate cancer. Our results demonstrate the relevance of cellular senescence in restricting tumorigenesis in vivo and support a model for cooperative tumour suppression in which p53 is an essential failsafe protein of Pten-deficient tumours.
UR - http://www.scopus.com/inward/record.url?scp=23244460597&partnerID=8YFLogxK
U2 - 10.1038/nature03918
DO - 10.1038/nature03918
M3 - ???researchoutput.researchoutputtypes.contributiontojournal.article???
C2 - 16079851
AN - SCOPUS:23244460597
SN - 0028-0836
VL - 436
SP - 725
EP - 730
JO - Nature
JF - Nature
IS - 7051
ER -