Send to

Choose Destination
Oncogene. 2006 Mar 30;25(14):2040-7.

The phosphoinositide 3-kinase/Akt pathway is essential for the retinoic acid-induced differentiation of F9 cells.

Author information

Department of Cell Biology and Signal Transduction. Institut de Génétique et de Biologie Moléculaire et Cellulaire CNRS/INSERM /ULP, Illkirch Cedex, France.


Retinoic acid (RA) induces cell growth arrest and differentiation through two families of nuclear receptors, the RARs and the RXRs. The phosphoinositide 3-kinase (PI3K)/Akt pathway also plays key roles in these processes, that is, cell cycle progression, cell differentiation and cell survival. We report that, in mouse embryocarcinoma cells (F9 cells), RA induces an early activation of PI3K and Akt via an increase in the expression of the p85alpha regulatory subunit. This effect is followed by an inhibition of Akt. Both effects require the integrity of the RA pathway as they are not observed in RA-resistant RARgamma null cells. We propose a model through which RA induces a biphasic regulation of Akt with an activation participating to the differentiation process, followed by an inhibition, which has been correlated to the RA-induced growth arrest.

[Indexed for MEDLINE]

Supplemental Content

Full text links

Icon for Nature Publishing Group
Loading ...
Support Center