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• W2056580092 abstract "Abnormal proliferation of vascular smooth muscle cells (VSMCs) contributes to intima formation after stenting and balloon angioplasty. Pin1, a peptidyl prolyl isomerase recognizing phosphorylated Ser/Thr–Pro, isomerizes the peptide bond. Because Pin1 overexpression is associated with transformation and the uncontrolled cell growth of tumors, we hypothesized that Pin1 functions as a chronic stimulator of VSMC proliferation. Pin1-positive smooth muscle cells were seen in the neointimal region of the femoral artery after guidewire injury. Exposure of VSMCS to platelet-derived growth factor (PDGF) increased Pin1 expression in a concentration-dependent manner. Basal cell growth rate and cyclin D1 expression were enhanced in Pin1-overexpressing VSMCs (Pin1-VSMCs). Moreover, PDGF-induced production of reactive oxygen species (ROS) in Pin1-VSMCs was higher than in control VSMCs. In Pin1-VSMCs, heme oxygenase-1 (HO-1) induction in response to nitric oxide donor was suppressed compared to control VSMCs. Nuclear translocation of nuclear factor E2-related factor-2 (Nrf2) was also diminished in Pin1-VSMCs. In contrast, the activity of the inducible minimal antioxidant response element (ARE) was potentiated in Pin1-null mouse embryonic fibroblasts (MEFs), compared to Pin1-wild-type MEFs. Moreover, Nrf2 ubiquitination was stimulated by Pin1 overexpression. Intraperitoneal injection of juglone (a Pin1 inhibitor) for 3 weeks (1 mg/kg, two times a week) significantly suppressed neointimal formation induced by wire injury. In conclusion, Pin1 induction during neointimal formation may be associated with ROS-mediated VSMC proliferation via down-regulation of Nrf2/ARE-dependent HO-1 expression. Pin1 may be a novel therapeutic target for several vascular diseases including atherosclerosis and stenosis." @default.
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• W2056580092 date "2010-06-15" @default.
• W2056580092 modified "2023-09-25" @default.
• W2056580092 title "Role of Pin1 in neointima formation: Down-regulation of Nrf2-dependent heme oxygenase-1 expression by Pin1" @default.
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• W2056580092 doi "https://doi.org/10.1016/j.freeradbiomed.2010.03.013" @default.
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