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Ppar-Alpha in Lipid and Lipoprotein Metabolism, Vascular Inflammation and Atherosclerosis

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Atherosclerosis, Hypertension and Diabetes

Part of the book series: Progress in Experimental Cardiology ((PREC,volume 8))

Abstract

Peroxisome proliferator-activated receptors (PPARs) are ligand-activated transcription factors belonging to the nuclear receptor superfamily, PPAR-alpha is highly expressed in liver, skeletal muscle, kidney, heart and the vascular wall. PPARs are activated by fattyacid derivatives and pharmacological agents such as fibrates for PPAR-alpha. PPAR- alpha controls intra-and extracellular lipid metabolisms. Fibric acids decrease triglyceride concentrations by increasing the expression of lipoprotein lipase and decreasing apo C-III concentration. Furthermore, they increase HDL-cholesterol by increasing the expression of apo A-I and apo A-II. In addition, PPARs also modulate the inflammatory response. PPAR activators have been shown to exert anti-inflammatory activities in various cell types by inhibiting the expression of proinflammatory genes such as cytokines, metalloproteases and acute-phase proteins. PPARs negatively regulate the transcription of inflammatory response genes by antagonizing the AP-1, nuclear factor-κB (NF-κB), signal transducer and activator of transcription (STAT) and nuclear factor of activated T-cells (NFAT) signalling pathways and by stimulating the catabolism of proinflammatory eicosanoids. PPAR-alpha activators (gemfibrozil) decrease the risk of coronary heart disease in patients with normal LDL-cholesterol and low HDL-cholesterol (VA-HIT) and they slow the progression of premature coronary atherosclerosis (BECAIT) (bezafibrate), particularly in patients with type 2 diabetes (DAIS) (fenofibrate).

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Fruchart, JC., Staels, B., Duriez, P. (2003). Ppar-Alpha in Lipid and Lipoprotein Metabolism, Vascular Inflammation and Atherosclerosis. In: Pierce, G.N., Nagano, M., Zahradka, P., Dhalla, N.S. (eds) Atherosclerosis, Hypertension and Diabetes. Progress in Experimental Cardiology, vol 8. Springer, Boston, MA. https://doi.org/10.1007/978-1-4419-9232-1_1

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