Open Access

The cell type-specific effect of TAp73 isoforms on the cell cycle and apoptosis

  • Jitka Holcakova1,
  • Pavla Ceskova1,
  • Roman Hrstka1,
  • Petr Muller1,
  • Lenka Dubska2,
  • Philip J. Coates3,
  • Emil Palecek4 and
  • Borivoj Vojtesek1Email author
Cellular & Molecular Biology LettersAn International Journal200813:11

https://doi.org/10.2478/s11658-008-0011-z

Received: 5 September 2007

Accepted: 11 January 2008

Published: 18 March 2008

Abstract

p73, a member of the p53 family, exhibits activities similar to those of p53, including the ability to induce growth arrest and apoptosis. p73 influences chemotherapeutic responses in human cancer patients, in association with p53. Alternative splicing of the TP73 gene produces many p73 C- and N-terminal isoforms, which vary in their transcriptional activity towards p53-responsive promoters. In this paper, we show that the C-terminal spliced isoforms of the p73 protein differ in their DNA-binding capacity, but this is not an accurate predictor of transcriptional activity. In different p53-null cell lines, p73β induces either mitochondrial-associated or death receptor-mediated apoptosis, and these differences are reflected in different gene expression profiles. In addition, p73 induces cell cycle arrest and p21WAF1 expression in H1299 cells, but not in Saos-2. This data shows that TAp73 isoforms act differently depending on the tumour cell background, and have important implications for p73-mediated therapeutic responses in individual human cancer patients.

Key words

p53 TAp73 ΔTAp73 DNA binding Transactivation Cell cycle Apoptosis

Notes

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