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Molecular and Cellular Biology, September 2005, p. 7432-7440, Vol. 25, No. 17
0270-7306/05/$08.00+0     doi:10.1128/MCB.25.17.7432-7440.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Role of Stat3 in Regulating p53 Expression and Function{dagger}

Guilian Niu,1 Kenneth L. Wright,1 Yihong Ma,2 Gabriela M. Wright,1 Mei Huang,2 Rosalyn Irby,2 Jon Briggs,1 James Karras,3 W. Douglas Cress,2 Drew Pardoll,4 Richard Jove,2* Jiangdong Chen,2 and Hua Yu1*

Immunology,1 Molecular Oncology Programs, H. Lee Moffitt Cancer Center and Research Institute, Tampa, Florida 33612,2 Antisense Drug Discovery, Isis Pharmaceuticals, Inc., Carlsbad, California 92008,3 Department of Oncology, Johns Hopkins University School of Medicine, Baltimore, Maryland 212054

Received 8 November 2004/ Returned for modification 20 December 2004/ Accepted 19 May 2005

Loss of p53 function by mutation is common in cancer. However, most natural p53 mutations occur at a late stage in tumor development, and many clinically detectable cancers have reduced p53 expression but no p53 mutations. It remains to be fully determined what mechanisms disable p53 during malignant initiation and in cancers without mutations that directly affect p53. We show here that oncogenic signaling pathways inhibit the p53 gene transcription rate through a mechanism involving Stat3, which binds to the p53 promoter in vitro and in vivo. Site-specific mutation of a Stat3 DNA-binding site in the p53 promoter partially abrogates Stat3-induced inhibition. Stat3 activity also influences p53 response genes and affects UV-induced cell growth arrest in normal cells. Furthermore, blocking Stat3 in cancer cells up-regulates expression of p53, leading to p53-mediated tumor cell apoptosis. As a point of convergence for many oncogenic signaling pathways, Stat3 is constitutively activated at high frequency in a wide diversity of cancers and is a promising molecular target for cancer therapy. Thus, repression of p53 expression by Stat3 is likely to have an important role in development of tumors, and targeting Stat3 represents a novel therapeutic approach for p53 reactivation in many cancers lacking p53 mutations.

* Corresponding author. Mailing address: Immunology and Molecular Oncology Programs, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL 33612. Phone: (813) 979-6711. Fax: (813) 632-1436. E-mail for Hua Yu: huayu{at}moffitt.usf.edu. E-mail for Richard Jove: richjove{at}moffitt.usf.edu.

{dagger} Supplemental material for this paper can be found at http://mcb.asm.org/.

Molecular and Cellular Biology, September 2005, p. 7432-7440, Vol. 25, No. 17
0022-538X/05/$08.00+0     doi:10.1128/MCB.25.17.7432-7440.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.



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