The homeobox gene Cdx1 belongs to the p53-p21(WAF)-Bcl-2 network in intestinal epithelial cells - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Biochemical and Biophysical Research Communications Année : 2002

The homeobox gene Cdx1 belongs to the p53-p21(WAF)-Bcl-2 network in intestinal epithelial cells

Virginie Moucadel
  • Fonction : Auteur
Maria Serena Totaro
  • Fonction : Auteur
Claire Domon-Dell
  • Fonction : Auteur
  • PersonId : 1101801
Philippe Soubeyran
  • Fonction : Auteur
Jean Charles Dagorn
  • Fonction : Auteur
Juan Lucio Iovanna
  • Fonction : Auteur

Résumé

Because the Cdx1 homeobox gene stimulates proliferation and induces transformation and tumorigenesis, it has been investigated whether it is involved in the complex network comprising p53, p21(WAF), and Bcl-2 in intestinal epithelial cells. Non-transformed intestinal IEC-6 cells and colon adenocarcinoma SW480 cells were used to study the putative molecular relationship between Cdx1, p53, p21(WAF), and Bcl-2. Wild-type p53 inhibited the transcriptional activity of the Cdx1 promoter whereas the inactive mutant p53(mut22/23) had no effect. Induction of Cdx1 expression had no direct effect on p53 expression and activity. However, it inhibited the transcriptional activity of the p21(WAF) promoter through Cdx1 binding to the p21(WAF) TATA-box and increased the transcriptional activity of the Bcl-2 promoter P2 through a consensus Cdx-binding site. Finally, compared to control cells, Cdx1-overexpressing cells were more resistant to adriamycin-induced apoptosis, probably because they do not show concomitant decrease in endogenous Bcl-2 level. In conclusion, Cdx1 is a negatively regulated target of p53 in intestinal cells. Its regulation of p21(WAF) and Bcl-2 is opposite to that of p53 and is p53-independent. Cdx1 belongs to the regulatory networks of apoptosis, proliferation, and differentiation. These results emphasize the oncogenic potential of Cdx1.
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Dates et versions

hal-03812793 , version 1 (12-10-2022)

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Virginie Moucadel, Maria Serena Totaro, Claire Domon-Dell, Philippe Soubeyran, Jean Charles Dagorn, et al.. The homeobox gene Cdx1 belongs to the p53-p21(WAF)-Bcl-2 network in intestinal epithelial cells. Biochemical and Biophysical Research Communications, 2002, 297 (3), pp.607-615. ⟨10.1016/s0006-291x(02)02250-7⟩. ⟨hal-03812793⟩
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