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• W2547099358 startingPage "1249" @default.
• W2547099358 abstract "ABSTRACT Elevation of free fatty acids (FFAs) is known to affect microvascular function and contribute to obesity‐associated insulin resistance, hypertension, and microangiopathy. Proliferative and synthetic vascular smooth muscle cells (VSMCs) increase intimal thickness and destabilize atheromatous plaques. This study aimed to investigate whether saturated palmitic acid (PA) and monounsaturated oleic acid (OA) modulate autophagy activity, cell proliferation, and vascular tissue remodeling in an aortic VSMC cell line. Exposure to PA and OA suppressed growth of VSMCs without apoptotic induction, but enhanced autophagy flux with elevation of Beclin‐1, Atg5, and LC3I/II. Cotreatment with autophagy inhibitors potentiated the FFA‐suppressed VSMC growth and showed differential actions of PA and OA in autophagy flux retardation. Both FFAs upregulated lectin‐like oxidized low‐density lipoprotein receptor 1 (LOX‐1) but only OA increased LDL uptake by VSMCs. Mechanistically, FFAs induced hyperphosphorylation of Akt, ERK1/2, JNK1/2, and p38 MAPK. All pathways, except OA‐activated PI3K/Akt cascade, were involved in the LOX‐1 upregulation, whereas blockade of PI3K/Akt and MEK/ERK cascades ameliorated the FFA‐induced growth suppression on VSMCs. Moreover, both FFAs exhibited tissue remodeling effect through increasing MMP‐2 and MMP‐9 expression and their gelatinolytic activities, whereas high‐dose OA significantly suppressed collagen type I expression. Conversely, siRNA‐mediated LOX‐1 knockdown significantly attenuated the OA‐induced tissue remodeling effects in VSMCs. In conclusion, OA and PA enhance autophagy flux, suppress aortic VSMC proliferation, and exhibit vascular remodeling effect, thereby leading to the loss of VSMCs and interstitial ECM in vascular walls and eventually the instability of atheromatous plaques. J. Cell. Biochem. 118: 1249–1261, 2017. © 2016 Wiley Periodicals, Inc." @default.
• W2547099358 created "2016-11-11" @default.
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• W2547099358 date "2017-01-10" @default.
• W2547099358 modified "2023-10-13" @default.
• W2547099358 title "Free Fatty Acids Induce Autophagy and LOX‐1 Upregulation in Cultured Aortic Vascular Smooth Muscle Cells" @default.
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• W2547099358 doi "https://doi.org/10.1002/jcb.25784" @default.
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