NDLI: Urokinase-type Plasminogen Activator (uPA) Induces Pulmonary Microvascular Endothelial Permeability through Low Density Lipoprotein Receptor-related Protein (LRP)-dependent Activation of Endothelial Nitric-oxide Synthase*

Content Provider	PubMed Central
Author	Makarova, Anastasia M. Lebedeva, Tatiana V. Nassar, Taher Higazi, Abd Al-roof Xue, Jing Carinato, Maria E. Bdeir, Khalil Cines, Douglas B. Stepanova, Victoria
Copyright Year	2011
Abstract	Urokinase plasminogen activator (uPA) and PA inhibitor type 1 (PAI-1) are elevated in acute lung injury, which is characterized by a loss of endothelial barrier function and the development of pulmonary edema. Two-chain uPA and uPA-PAI-1 complexes (1–20 nm) increased the permeability of monolayers of human pulmonary microvascular endothelial cells (PMVECs) in vitro and lung permeability in vivo. The effects of uPA-PAI-1 were abrogated by the nitric-oxide synthase (NOS) inhibitor l-NAME (N D-nitro-l-arginine methyl ester). Two-chain uPA (1–20 nm) and uPA-PAI-1 induced phosphorylation of endothelial NOS-Ser1177 in PMVECs, which was followed by generation of NO and the nitrosylation and dissociation of β-catenin from VE-cadherin. uPA-induced phosphorylation of eNOS was decreased by anti-low density lipoprotein receptor-related protein-1 (LRP) antibody and an LRP antagonist, receptor-associated protein (RAP), and when binding to the uPA receptor was blocked by the isolated growth factor-like domain of uPA. uPA-induced phosphorylation of eNOS was also inhibited by the protein kinase A (PKA) inhibitor, myristoylated PKI, but was not dependent on PI3K-Akt signaling. LRP blockade and inhibition of PKA prevented uPA- and uPA-PAI-1-induced permeability of PMVEC monolayers in vitro and uPA-induced lung permeability in vivo. These studies identify a novel pathway involved in regulating PMVEC permeability and suggest the utility of uPA-based approaches that attenuate untoward permeability following acute lung injury while preserving its salutary effects on fibrinolysis and airway remodeling.
Related Links	http://dx.doi.org/10.1074/jbc.m110.210195
Ending Page	23053
Page Count	10
Starting Page	23044
File Format	PDF
ISSN	00219258
e-ISSN	1083351X
Journal	The Journal of Biological Chemistry
Issue Number	26
Volume Number	286
Language	English
Publisher	American Society for Biochemistry and Molecular Biology
Publisher Date	2011-07-01
Access Restriction	Open
Rights Holder	American Society for Biochemistry and Molecular Biology
Subject Keyword	Cell Biology Biochemistry Molecular Biology Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Cell Biology Biochemistry Molecular Biology

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