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Type: Artigo de periódico
Title: Fibrates And Fish Oil, But Not Corn Oil, Up-regulate The Expression Of The Cholesteryl Ester Transfer Protein (cetp) Gene.
Author: Raposo, Helena F
Patrício, Patrícia R
Simões, Mariana C
Oliveira, Helena C F
Abstract: Cholesteryl ester transfer protein (CETP) is a plasma protein that reduces high density lipoprotein (HDL)-cholesterol (chol) levels and may increase atherosclerosis risk. n-3 and n-6 polyunsaturated fatty acids (PUFAs) are natural ligands, and fibrates are synthetic ligands for peroxisome proliferator activated receptor-alpha (PPARα), a transcription factor that modulates lipid metabolism. In this study, we investigated the effects of PUFA oils and fibrates on CETP expression. Hypertriglyceridemic CETP transgenic mice were treated with gemfibrozil, fenofibrate, bezafibrate or vehicle (control), and normolipidemic CETP transgenic mice were treated with fenofibrate or with fish oil (FO; n-3 PUFA rich), corn oil (CO, n-6 PUFA rich) or saline. Compared with the control treatment, only fenofibrate significantly diminished triglyceridemia (50%), whereas all fibrates decreased the HDL-chol level. Elevation of the CETP liver mRNA levels and plasma activity was observed in the fenofibrate (53%) and gemfibrozil (75%) groups. Compared with saline, FO reduced the plasma levels of nonesterified fatty acid (26%), total chol (15%) and HDL-chol (20%). Neither of the oil treatments affected the plasma triglyceride levels. Compared with saline, FO increased the plasma adiponectin level and reduced plasma leptin levels, whereas CO increased the leptin levels. FO, but not CO, significantly increased the plasma CETP mass (90%) and activity (23%) as well as increased the liver level of CETP mRNA (28%). In conclusion, fibrates and FO, but not CO, up-regulated CETP expression at both the mRNA and protein levels. We propose that these effects are mediated by the activation of PPARα, which acts on a putative PPAR response element in the CETP gene.
Subject: Animals
Cholesterol Ester Transfer Proteins
Combined Modality Therapy
Corn Oil
Crosses, Genetic
Dietary Supplements
Fibric Acids
Fish Oils
Hypolipidemic Agents
Mice, Transgenic
Rna, Messenger
Random Allocation
Cetp Expression
Fish Oil
Omega-3 Polyunsaturated Fatty Acids
Citation: The Journal Of Nutritional Biochemistry. v. 25, n. 6, p. 669-74, 2014-Jun.
Rights: fechado
Identifier DOI: 10.1016/j.jnutbio.2014.02.008
Date Issue: 2014
Appears in Collections:Unicamp - Artigos e Outros Documentos

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