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J. Biol. Chem., Vol. 275, Issue 37, 28750-28756, September 15, 2000
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From the Tissue factor (TF), apart from activating the
extrinsic pathway of the blood coagulation, is a principal regulator of
embryonic angiogenesis and oncogenic neoangiogenesis, but also
influences inflammation, leukocyte diapedesis and tumor progression.
The intracellular domain of TF lacks homology to other classes of receptors and hence the signaling mechanism is poorly understood. Here
we demonstrate that factor VIIa (the natural ligand for TF) induces the
activation of the Src family members c-Src, Lyn, and Yes, and
subsequently phosphatidylinositol 3-kinase (PI3K), followed by
stimulation of c-Akt/protein kinase B as well as the small GTPases Rac
and Cdc42. In turn Rac mediates p38 mitogen-activated protein (MAP)
kinase activation and cytoskeletal reorganization, whereas factor
VIIa-induced p42/p44 MAP kinase stimulation required PI3K enzymatic
activity but was not inhibited by dominant negative Rac proteins. We
propose that this Src family member/PI3K/Rac-dependent signaling pathway is a major mediator of factor VIIa/TF effects in pathophysiology.
Factor VIIa/Tissue Factor-induced Signaling via Activation of
Src-like Kinases, Phosphatidylinositol 3-Kinase, and Rac*
§,
,
,
,
, and
**
Laboratory for Experimental Internal
Medicine, G2-130, Academic Medical Center, Meibergdreef 9, 1105 AZ
Amsterdam, The Netherlands, the ¶ Institute of Biomembranes,
Department of Molecular Cell Biology, Utrecht University, Padualaan
8, 3584 CH Utrecht, The Netherlands, and the
Department of
Pathology, Meibergdreef 9, 1105 AZ Amsterdam, The Netherlands
*
This study was supported in part by a grant (UVA 98-1855)
from the Dutch Cancer Society (Koningin Wilhelmina Fonds).The costs of publication of this
article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in
accordance with 18 U.S.C. Section
1734 solely to indicate this fact.
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