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The Journal of Neuroscience, April 15, 1998, 18(8):2933-2943
Phosphatidylinositol 3-Kinase and Akt Protein Kinase Are
Necessary and Sufficient for the Survival of Nerve Growth
Factor-Dependent Sympathetic Neurons
Robert J.
Crowder and
Robert S.
Freeman
Department of Pharmacology and Physiology, University of Rochester,
School of Medicine, Rochester, New York 14642
Recent studies have suggested a role for phosphatidylinositol (PI)
3-kinase in cell survival, including the survival of neurons. We used
rat sympathetic neurons maintained in vitro to
characterize the potential survival signals mediated by PI 3-kinase and
to test whether the Akt protein kinase, a putative effector of PI 3-kinase, functions during nerve growth factor (NGF)-mediated survival.
Two PI 3-kinase inhibitors, LY294002 and wortmannin, block NGF-mediated
survival of sympathetic neurons. Cell death caused by LY294002
resembles death caused by NGF deprivation in that it is blocked by a
caspase inhibitor or a cAMP analog and that it is accompanied by the
induction of c-jun, c-fos, and
cyclin D1 mRNAs. Treatment of neurons with NGF activates
endogenous Akt protein kinase, and LY294002 or wortmannin blocks this
activation. Expression of constitutively active Akt or PI 3-kinase in
neurons efficiently prevents death after NGF withdrawal. Conversely,
expression of dominant negative forms of PI 3-kinase or Akt induces
apoptosis in the presence of NGF. These results demonstrate that PI
3-kinase and Akt are both necessary and sufficient for the survival of NGF-dependent sympathetic neurons.
Key words:
apoptosis; phosphatidylinositol 3-kinase; NGF; neuronal
survival; Akt; neurotrophic factor
Copyright © 1998 Society for Neuroscience 0270-6474/98/1882933-11$05.00/0
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