Letter abstract


Nature Cell Biology 9, 698 - 706 (2007)
Published online: 13 May 2007 | doi:10.1038/ncb1598

p73 supports cellular growth through c-Jun-dependent AP-1 transactivation

Faina Vikhanskaya1, Wen Hong Toh1, Iqbal Dulloo1, Qiang Wu2, Lakshmanane Boominathan3, Huck Hui Ng4,2, Karen H. Vousden5 & Kanaga Sabapathy1,6

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The cause or consequence of overexpression of p73 (refs 1, 2), the structural and functional homologue of the tumour-suppressor gene product p53 (refs 3, 4), in human cancers is poorly understood. Here, we report a role for p73 in supporting cellular growth through the upregulation of AP-1 transcriptional activity. p73 suppresses growth when overexpressed alone, but synergises with the proto-oncogene c-Jun to promote cellular survival. Conversely, silencing of p73 expression compromises cellular proliferation. Molecular analysis revealed that expression of the AP-1 target-gene product cyclinD1 (ref. 5) is reduced concomitant with p73, but not p53, silencing. Moreover, cyclinD1 was induced by p73 expression in a c-Jun-dependent manner, and was required for p73-mediated cell survival. Furthermore, c-Jun-dependent AP-1 transcriptional activity was augmented by p73 and, consistently, induction of endogenous AP-1 target genes was compromised in the absence of p73. Chromatin immunoprecipitation and electrophoretic mobility shift analysis indicated that p73 enhanced the binding of phosphorylated c-Jun and Fra-1, another AP-1 family member, to AP-1 consensus DNA sequences, by regulating c-Jun phosphorylation and Fra-1 expression. Collectively, our data demonstrates a novel and unexpected role of p73 in augmenting AP-1 transcriptional activity through which it supports cellular growth.

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  1. Laboratory of Molecular Carcinogenesis, National Cancer Centre, 11 Hospital Drive, Singapore 169610, Singapore.
  2. Genome Institute of Singapore, Biopolis, Singapore 138672, Singapore.
  3. Department of Physiology, National University of Singapore, 10, Kent Ridge Crescent, Singapore 119260, Singapore.
  4. Department of Biological Sciences, National University of Singapore, 10, Kent Ridge Crescent, Singapore 119260, Singapore.
  5. Beatson Institute for Cancer Research, Garscube Estate, Switchback Road, Bearsden, Glasgow G61 1BD, UK.
  6. Department of Biochemistry, National University of Singapore, 10, Kent Ridge Crescent, Singapore 119260, Singapore.

Correspondence to: Kanaga Sabapathy1,6 e-mail: cmrksb@nccs.com.sg



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