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- W2119906430 abstract "Objective— Growth factors may play a permissive role in atherosclerosis initiation and progression, in part via their promotion of vascular smooth muscle cell (VSMC) accumulation in plaques. However, unstable human plaques often have a relative paucity of VSMC, which has been suggested to contribute to plaque rupture and erosion and to clinical events. Insulin-like growth factor-1 (IGF-1) is an endocrine and autocrine/paracrine growth factor that is a mitogen for VSMC, but when infused into Apoe −/− mice it paradoxically reduces atherosclerosis burden. Methods and Results— To determine the effect of stimulation of VSMC growth on atherosclerotic plaque development and to understand mechanisms of IGF-1’s atheroprotective effect, we assessed atherosclerotic plaques in mice overexpressing IGF-1 in smooth muscle cells (SMC) under the control of the α-smooth muscle actin promoter, after backcrossing to the Apoe −/− background (SMP8/ Apoe −/− ). Compared with Apoe −/− mice, these SMP8/ Apoe −/− mice developed a comparable plaque burden after 12 weeks on a Western diet, suggesting that the ability of increased circulating IGF-1 to reduce plaque burden was mediated in large part via non-SMC target cells. However, advanced plaques in SMP8/ Apoe −/− mice displayed several features of plaque stability, including increased fibrous cap area, α-smooth muscle actin–positive SMC and collagen content, and reduced necrotic cores. Conclusion— These findings indicate that stimulation of VSMC IGF-1 signaling does not alter total atherosclerotic plaque burden and may improve atherosclerotic plaque stability." @default.
- W2119906430 created "2016-06-24" @default.
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- W2119906430 date "2010-10-01" @default.
- W2119906430 modified "2023-10-14" @default.
- W2119906430 title "Smooth Muscle Cell–Specific Insulin-Like Growth Factor-1 Overexpression in <i>Apoe</i> <sup>−/−</sup> Mice Does Not Alter Atherosclerotic Plaque Burden but Increases Features of Plaque Stability" @default.
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- W2119906430 doi "https://doi.org/10.1161/atvbaha.110.210831" @default.
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