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J. Biol. Chem., Vol. 276, Issue 32, 30359-30365, August 10, 2001
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§¶,
§
,
,

From the Vascular endothelial growth factor
(VEGF) utilizes a phosphoinositide 3-kinase (PI 3-kinase)/Akt signaling
pathway to protect endothelial cells from apoptotic death. Here we show
that PI 3-kinase/Akt signaling promotes endothelial cell survival by
inhibiting p38 mitogen-activated protein kinase
(MAPK)-dependent apoptosis. Blockade of the PI 3-kinase or
Akt pathways in conjunction with serum withdrawal stimulates
p38-dependent apoptosis. Blockade of PI 3-kinase/Akt also
led to enhanced VEGF activation of p38 and apoptosis. In this context,
the pro-apoptotic effect of VEGF is attenuated by the p38 MAPK
inhibitor SB203580. VEGF stimulation of endothelial cells or infection
with an adenovirus expressing constitutively active Akt causes MEKK3
phosphorylation, which is associated with decreased MEKK3 kinase
activity and down-regulation of MKK3/6 and p38 MAPK activation.
Conversely, activation-deficient Akt decreases VEGF-stimulated MEKK3
phosphorylation and increases MKK/p38 activation. Activation of MKK3/6
is not dependent on Rac activation since dominant negative Rac does not
decrease p38 activation triggered by inhibition of PI 3-kinase. Thus,
cross-talk between the Akt and p38 MAPK pathways may regulate the level
of cytoprotection versus apoptosis and is a new
mechanism to explain the cytoprotective actions of Akt.
Department of Pharmacology and Molecular
Cardiobiology Program, Boyer Center for Molecular Medicine, Yale
University School of Medicine, New Haven, Connecticut 06536 and the
** Division of Cardiovascular Research, St. Elizabeth's Medical Center
of Boston, Boston, Massachusetts 02135
Supported by Ministerio de Educación y Cultura Grant
EX99-38446345 and a grant from the Asociación Española para
el Estudio del Hígado, Spain.

Established investigator of the American Heart Association. To
whom correspondence should be addressed. Tel.: 203-737-2291; Fax: 203-737-2290; E-mail: william.sessa@yale.edu.
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