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The signaling pathways that mediate the ability of NGF to support survival of dependent neurons are not yet completely clear. However previous work has shown that the c-Jun pathway is activated after NGF withdrawal, and blocking this pathway blocks neuronal cell death. In this paper we show that over-expression in sympathetic neurons of phosphatidylinositol (PI) 3-kinase or its downstream effector Akt kinase blocks cell death after NGF withdrawal, in spite of the fact that the c-Jun pathway is activated. Yet, neither the PI 3-kinase inhibitor LY294002 nor a dominant negative PI 3-kinase cause sympathetic neurons to die if they are maintained in NGF. Thus, although NGF may regulate multiple pathways involved in neuronal survival, stimulation of the PI 3-kinase pathway is sufficient to allow cells to survive in the absence of this factor.

Activated Phosphatidylinositol 3-Kinase and Akt Kinase Promote Survival of Superior Cervical Neurons