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- W2007017138 abstract "Background Urokinase (uPA) modulates cellular and extracellular matrix responses within the microenvironment of the vessel wall and has been shown to activate the epidermal growth factor receptor (EGFR). This study examines the role of the protease domain of uPA during EGFR activation in human vascular smooth muscle cells (VSMC). Methods Human coronary VSMC were cultured in vitro. Assays of cell proliferation and EGFR phosphorylation were examined in response to the carboxyterminal fragment of uPA (CTF) in the presence and absence of the plasmin, metalloprotease and a disintegrin and metalloproteinase (ADAM) inhibitors, heparin-bound epidermal growth factor (HB-EGF), and EGFR inhibitors, and small interfering RNA to EGFR and ADAMs. Results CTF produced a dose-dependent increase in DNA synthesis and cell proliferation in human VSMC, which was blocked in a dose-dependent manner by both plasmin inhibitors and the EGFR inhibitor, AG1478. CTF induced time-dependent EGFR phosphorylation, which was blocked by inhibitors of plasmin and metalloproteinases activity. The presence of urokinase plasminogen activator receptor was not required. Inhibition of ADAM-10 and -12, and of HB-EGF blocked EGFR activation in response to CTF. CTF-mediated activation of EGFR was mediated through Gβγ, src, and NAD(P)H oxidase. Conclusions In human coronary VSMC, uPA induces uPAR-independent, domain-dependent smooth muscle cell proliferation through transactivation of EGFR by a plasmin-mediated, ADAM-induced, and HB-EGF–dependent process, which is mediated by the intracellular pathways involving Gαi, Gβγ, src, and NAD(P)H oxidase." @default.
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- W2007017138 date "2014-12-01" @default.
- W2007017138 modified "2023-09-28" @default.
- W2007017138 title "Protease-mediated human smooth muscle cell proliferation by urokinase requires epidermal growth factor receptor transactivation by triple membrane signaling" @default.
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- W2007017138 doi "https://doi.org/10.1016/j.jss.2014.06.054" @default.
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