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• W2068578399 abstract "Insulin-like growth factor-I (IGF-I) plays an important role in proliferation of vascular smooth muscle cells (VSMCs). However, the mechanism that IGF-I induces VSMCs proliferation is not completely understood. In this study, we determined (a) whether and how IGF-I induces transactivation of epidermal growth factor receptor (EGFR) in primary rat aortic VSMCs, (b) the contribution of EGFR to IGF-I-stimulated activation of extracellular signal-regulated kinase (ERK) and cell proliferation, and (c) the role of reactive oxygen species (ROS) in the cellular function. We showed that IGF-I induced phosphorylation of EGFR and ERK1/2 in VSMCs. AG1478, an EGFR inhibitor, inhibited IGF-I-induced phoshorylation of EGFR and ERK1/2. IGF-I stimulated ROS production and Src activation. Antioxidants inhibited IGF-I-induced ROS generation and activation of EGFR, ERK, and Src. Src kinase inhibitor PP1 and Src siRNA blocked IGF-I-induced activation of EGFR and ERK1/2. Inhibition of IGF-I-stimulated EGFR activation inhibited IGF-I-induced VSMC proliferation. These results suggest that (1) IGF-I induces EGFR activation through production of ROS and ROS-mediated Src activation in VSMCs, and (2) EGFR transactivation is required for IGF-I-induced VSMC proliferation." @default.
• W2068578399 created "2016-06-24" @default.
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• W2068578399 date "2007-06-01" @default.
• W2068578399 modified "2023-09-27" @default.
• W2068578399 title "Insulin-like growth factor-I (IGF-I) induces epidermal growth factor receptor transactivation and cell proliferation through reactive oxygen species" @default.
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• W2068578399 doi "https://doi.org/10.1016/j.freeradbiomed.2007.01.037" @default.
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