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Vol. 9, Issue 11, 3107-3118, November 1998

Role of Akt and c-Jun N-terminal Kinase 2 in Apoptosis Induced by Interleukin-4 Deprivation

Ana Cerezo,* Carlos Martínez-A,* Diego Lanzarot,* Siegmund Fischer,dagger Thomas F. Franke,Dagger and Angelita Rebollo*§

 *Department of Immunology and Oncology, Centro Nacional de Biotecnología, Universidad Autónoma, Campus de Cantoblanco, E-28049 Madrid, Spain;  dagger Laboratoire d'Oncologie Cellulaire et Moleculaire, Institut National de la Santé et de la Recherche Médicale-363, Hôpital Cochin, F-75014 Paris, France; and  Dagger Department of Pharmacology, Columbia University, New York, New York 10032

We have shown previously that interleukin-4 (IL-4) protects TS1alpha beta cells from apoptosis, but very little is known about the mechanism by which IL-4 exerts this effect. We found that Akt activity, which is dependent on phosphatidylinositol 3 kinase, is reduced in IL-4-deprived TS1alpha beta cells. Overexpression of wild-type Akt or a constitutively active Akt mutant protects cells from IL-4 deprivation-induced apoptosis. Readdition of IL-4 before the commitment point is able to restore Akt activity. We also show expression and c-Jun N-terminal kinase 2 activation after IL-4 deprivation. Overexpression of the constitutively activated Akt mutant in IL-4-deprived cells correlates with inhibition of c-Jun N-terminal kinase 2 activity. Finally, TS1alpha beta survival is independent of Bcl-2, Bcl-x, or Bax.


§   Corresponding author. E-mail address: arebollo{at}cnb.uam.es.


Molecular Biology of the Cell
Vol. 9, 3107-3118, November 1998
Copyright © 1998 by The American Society for Cell Biology



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