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

and
*Department of Immunology and Oncology, Centro Nacional de
Biotecnología, Universidad Autónoma, Campus de
Cantoblanco, E-28049 Madrid, Spain;
We have shown previously that interleukin-4 (IL-4)
protects TS1
Laboratoire
d'Oncologie Cellulaire et Moleculaire, Institut National de la
Santé et de la Recherche Médicale-363, Hôpital
Cochin, F-75014 Paris, France; and
Department of
Pharmacology, Columbia University, New York, New York 10032

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 TS1
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, TS1
survival is independent of Bcl-2,
Bcl-x, or Bax.
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