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United States Department of Agriculture

Agricultural Research Service

Title: Differential influence of distinct fatty acids on cardiomyocyte metabolic gene expression

Authors
item Lockbridge, Joseph - BAYLOR COLLEGE MED
item Durgan, David - BAYLOR COLLEGE MED
item Egbejimi, Oluwaseun - BAYLOR COLLEGE MED
item Stanley, William - CASE WESTERN RESERVE UNIV
item Young, Martin

Submitted to: Circulation
Publication Type: Abstract Only
Publication Acceptance Date: July 20, 2006
Publication Date: October 31, 2006
Citation: Lockbridge, J.B., Durgan, D.J., Egbejimi, O., Stanley, W.C., Young, M.E. 2006. Differential influence of distinct fatty acids on cardiomyocyte metabolic gene expression [abstract]. Circulation. 114(18):209

Technical Abstract: Diabetes mellitus increases risk for cardiovascular disease, and exposes the heart to high plasma fatty acid (FA) levels, which induce genes promoting FA oxidation (e.g., malonyl-CoA decarboxylase; mcd), as well as those suppressing carbohydrate oxidation (e.g., pyruvate dehydrogenase kinase 4; pdk4). Little is known regarding the time course and magnitude of the effects of distinct FA species on the expression of metabolic genes in the cardiomyocytes of the heart. As such, the time- (3, 6, 12, 24, and 48 hrs) and concentration- (0.1, 0.2, and 0.4 mM) dependent effects of octanoate (8:0), palmitate (16:0), stearate (18:0), oleate (18:1), and linoleic acid (18:2) on metabolic gene expression were investigated in isolated adult rat cardiomyocytes (ARCs). Five known FA-responsive genes were studied: cytosolic thioesterase 1 (cte1), mitochondrial thioesterase 1 (mte1), mcd, pdk4, and uncoupling protein 3 (ucp3). The general order of responsiveness of ARCs to the FAs investigated, in terms of initial rates of induction of FA-responsive genes, was oleate>stearate>palmitate>=linoleic>octanoate. The effects of stearate and palmitate tended to be transient (i.e., initial high induction, followed by subsequent repression), while oleate and linoleic acid caused relatively sustained induction of metabolic genes. Gene-specific effects were also observed; palmitate exhibited relatively small effects on ucp3, as compared to the other genes investigated. These findings may explain why diets high in unsaturated FAs (e.g., oleate) are cardioprotective, while diets rich in saturated FAs (e.g., palmitate) are not.

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