Arf-bp1 as mediator of p53-dependent and independent tumor...

C - Chemistry – Metallurgy – 12 – Q

Patent

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C12Q 1/68 (2006.01) C07H 21/04 (2006.01) C12N 9/64 (2006.01) C12P 21/06 (2006.01) G01N 33/574 (2006.01)

Patent

CA 2580662

The present invention relates to the mechanism of ARF-mediated cell growth suppression. ARF-BP1 is identified as a novel ubiquitin ligase, and a major component of ARF-containing nuclear complexes in human cells. The present invention discloses a novel mechanism of ARF-mediated p53 activation and that ARF-BP1 is a critical mediator of both p53-independent and p53-dependent tumor suppression functions of ARF. Inactivation of ARF-BP1 in normal cells stabilizes p53 and induces p53-dependent apoptosis. Inactivation of ARF-BP1, but not Mdm2, in p53-wildtype cells promotes cell growth inhibition in a manner reminiscent of ARF induction. ARF-BP1 directly binds and ubiquitinates p53 and inactivation of endogenous ARF-BP1 is crucial for ARF-mediated p53 stabilization in Mdm2-null cells. ARF-BP1 is advantageous over Mdm2 as a target for suppressing tumor cell growth regardless of p53 status.

La présente invention concerne le mécanisme de suppression de croissance cellulaire médiée par ARF. ARF-BP1 est identifié comme nouvelle ubiquitine ligase, et un composant principal de complexes nucléaires à ARF des cellules humaines. La présente invention concerne un nouveau mécanisme d'activation de p53 médiée par ARF, ARF-BP1 étant un médiateur critique des fonctions de suppression tumorale dépendant de p53 et indépendant de p53 de l'ARF. La désactivation de ARF-BP1 dans des cellules normales stabilise p53 et induit l'apoptose dépendant de p53. La désactivation de ARF-BP1, mais pas de Mdm2, dans des cellules de type sauvage p53 favorise l'inhibition de la croissance cellulaire d'une manière rappelant l'induction par ARF. ARF-BP1 se fixe directement à p53 et permet l'ubiquitination de celui-ci, la désactivation de l'ARF-BP1 endogène étant cruciale pour la stabilisation de p53 médiée par ARF dans les cellules nulles Mdm2. ARF-BP1 est avantageux par rapport à Mdm2 comme cible de suppression de la croissance cellulaire tumorale indépendamment de l'état de p53.

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