Cited by 162Blood Coagulation and Thrombosis MechanismsAngiogenesis and VEGF in CancerProtease and Inhibitor Mechanisms

Activated protein C induces endothelial cell proliferation by mitogen-activated protein kinase activation in vitro and angiogenesis in vivo

Uchiba, Mitsuhiro, Okajima, Kenji, Oike, Yuichi, Ito, Yasuhiro, Fukudome, Kenji, Isobe, Hirotaka, Suda, Toshio·2004·Circulation Research

Abstract

Activated protein C (APC), a natural anticoagulant, has recently been demonstrated to activate the mitogen-activated protein kinase (MAPK) pathway in endothelial cells in vitro. Because the MAPK pathway is implicated in endothelial cell proliferation, it is possible that APC induces endothelial cell proliferation, thereby causing angiogenesis. We examined this possibility in the present study. APC activated the MAPK pathway, increased DNA synthesis, and induced proliferation in cultured human umbilical vein endothelial cells dependent on its serine protease activity. Antibody against the endothelial protein C receptor (EPCR) inhibited these events. Early activation of the MAPK pathway was inhibited by an antibody against protease-activated receptor-1, whereas neither late and complete activation of the MAPK pathway nor endothelial cell proliferation were inhibited by this antibody. APC activated endothelial nitric oxide synthase (eNOS) via phosphatidylinositol 3-kinase–dependent phosphorylation, followed by activation of protein kinase G, suggesting that APC bound to EPCR might activate the endothelial MAPK pathway by a mechanism similar to that of VEGF. APC induced morphogenetic changes resembling tube-like structures of endothelial cells, whereas DIP-APC did not. When applied topically to the mouse cornea, APC clearly induced angiogenesis in wild-type mice, but not in eNOS knockout mice. These in vitro events induced by APC might at least partly explain the angiogenic activity in vivo. This angiogenic activity of APC might contribute to maintain proper microcirculation in addition to its antithrombotic activity.

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Authors
Uchiba, M., Okajima, K., Oike, Y., Ito, Y., Fukudome, K., Isobe, H., & Suda, T.
Affiliations
Saga University (JP)
Venue
Circulation Research
Published
2004-07-09
Volume
95
Issue
1
Pages
34-41
ISSN
  • 0009-7330 (ISSN-L)
  • 1524-4571
OpenAlex
W2105823536
Cited by
162
References
31
Citations by year
2026: 1 · 2025: 2 · 2024: 8 · 2023: 5 · 2022: 8 · 2021: 5 · 2020: 5 · 2019: 7 · 2018: 3 · 2017: 6 · 2016: 3 · 2015: 6 · 2014: 8 · 2013: 5 · 2012: 8
FWCI
8.86
Type
journal article
Language
en
Open access
closed
Locations
  • Circulation Research (publishedVersion)
  • PubMed (publishedVersion)
  • Institutional Repositories DataBase (IRDB) (submittedVersion)
Topics
  • Health Sciences › Medicine › Hematology › Blood Coagulation and Thrombosis Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Angiogenesis and VEGF in Cancer
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Protease and Inhibitor Mechanisms
Keywords
activated protein C, endothelial cell proliferation, angiogenesis, MAPK signaling, endothelial protein C receptor, protease-activated receptor 1, endothelial nitric oxide synthase, phosphatidylinositol 3-kinase, protein kinase G, serine protease activity, human umbilical vein endothelial cells, corneal neovascularization, microcirculation, antithrombotic activity
MeSH terms
Animals, Antibodies, Blood Coagulation Factors, Cells, Cultured, DNA, Endothelium, Vascular, Enzyme Activation, Cyclic GMP, Humans, Nitric Oxide, Protein C, Receptors, Cell Surface, Neovascularization, Physiologic, MAP Kinase Signaling System, Endothelial Cells, Receptor, PAR-1, Protein Kinase Inhibitors, Extracellular Signal-Regulated MAP Kinases, Cell Proliferation, Mice

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