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J. Biol. Chem., Vol. 276, Issue 38, 35622-35628, September 21, 2001
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From the Departments of Phospholipase D (PLD), phosphatidylinositol
3-kinase (PI3K), and Akt are known to be involved in cellular signaling
related to proliferation and cell survival. In this report, we provide evidence that PLD links sphingosine 1-phosphate (S1P)-induced activation of the G protein-coupled EDG3 receptor to stimulation of
PI3K and its downstream effector Akt in Chinese hamster ovary (CHO)
cells. S1P stimulation of EDG3-overexpressing CHO cells but not
vector-transfected cells induced activation of PLD, PI3K, and Akt in a
time- and dose-dependent manner. Akt phosphorylation was
prevented by the PI3K inhibitors wortmannin and LY294002
(2-(4-monrpholinyl)-8-phenyl-4H-1-benzopyran-4-one), indicating that
Akt activation was dependent on PI3K. S1P-induced activation of PI3K
and Akt was abrogated by 1-butanol, which inhibited S1P-induced
accumulation of phosphatidic acid by serving as a phosphatidyl group
acceptor in the transphosphatidylation reaction catalyzed by PLD,
whereas both PI3K and Akt activation were not inhibited by
2-butanol without such reaction. Co-expression of wild-type PLD2 with
myc-Akt resulted in increased Akt activation in response to S1P. In
contrast, co-expression of a catalytically inactive mutant of PLD2
eliminated the S1P-induced Akt activation. The treatment of
EDG3-expressing CHO cells with exogenous Streptomyces chromofuscus PLD, which caused an accumulation of phosphatidic acid, resulted in increases in PI3K activity and the phosphorylation of
Akt, the latter of which was completely abolished by LY294002. Furthermore, S1P-induced membrane ruffling, which was dependent on PI3K
and Rac, was inhibited by 1-butanol, but not by 2-butanol. These
results demonstrate that PLD participates in the activation of PI3K and
Akt stimulation of EDG3 receptor.
Biochemistry and
** Internal Medicine, Gifu University School of Medicine,
Gifu 500-8705, Japan, ¶ Department of Physiology, Kanazawa
University School of Medicine, Kanazawa 920-8640, Japan,
Gifu
International Institute of Biotechnology and Institute of Applied
Biochemistry, Mitake, Gifu 505-0116, Japan, and

Department of Life Science, Division of
Molecular and Life Sciences, Pohang University of Science & Technology,
Pohang 790-784, South Korea
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