Akt as a mediator of cell death.

TitleAkt as a mediator of cell death.
Publication TypeJournal Article
Year of Publication2003
AuthorsLuo HR, Hattori H, Hossain MA, Hester L, Huang Y, Lee-Kwon W, Donowitz M, Nagata E, Snyder SH
JournalProceedings of the National Academy of Sciences of the United States of America
Date Published2003 Sep 30

Protein kinase B/Akt possesses prosurvival and antiapoptotic activities and is involved in growth factor-mediated neuronal protection. In this study we establish Akt deactivation as a causal mediator of cell death. Akt deactivation occurs in multiple models of cell death including N-methyl-d-aspartate excitotoxicity, vascular stroke, and nitric oxide (NO)- and hydrogen peroxide (H2O2)-elicited death of HeLa, PC12, and Jurkat T cells. Akt deactivation characterizes both caspase-dependent and -independent cell death. Conditions rescuing cell death, such as treatment with poly(ADP-ribose) polymerase or NO synthase inhibitors and preconditioning with sublethal concentrations of N-methyl-d-aspartate, restore Akt activity. Infection of neurons with adenovirus expressing constitutively active Akt prevents excitotoxicity, whereas phosphatidylinositol 3-kinase inhibitors or infection with dominant negative Akt induce death of untreated neuronal cells.

Alternate JournalProc. Natl. Acad. Sci. U.S.A.