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pubmed-article:12670494pubmed:abstractTextThis study investigated the effect of oleic acid on the expression levels of endothelin-1 (ET-1) and on the signaling pathways mediating it in human aortic endothelial cells (HAECs). ET-1 mRNA expression was significantly increased by oleic acid in a dose- and time-dependent manner. Elevation of ET-1 expression in response to oleic acid was inhibited by the protein kinase C (PKC) inhibitor, GF109203X, or the NF-kappa B inhibitor, pyrrolidine dithiocarbamate. In addition, both PKC and NF-kappa B activities were significantly increased by oleic acid. Immunoblot analysis revealed that conventional PKCs (PKC-alpha and -beta II isoforms) were significantly increased in the membranous fractions of HAECs treated with oleic acid. PKC inhibitor completely abolished oleic acid-induced NF-kappa B activation, suggesting that PKC activation is upstream of NF-kappa B activation in oleic acid-induced ET-1 expression. These data suggest that elevated plasma oleic acid levels observed in obese, insulin-resistant subjects result in endothelial dysfunction, at least in part, through an increase in ET-1 expression.lld:pubmed
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pubmed-article:12670494pubmed:articleTitleOleic acid induces endothelin-1 expression through activation of protein kinase C and NF-kappa B.lld:pubmed
pubmed-article:12670494pubmed:affiliationDepartment of Internal Medicine, University of Ulsan College of Medicine, Poongnap-dong, Songpa-ku, 138-736, Seoul, South Korealld:pubmed
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pubmed-article:12670494pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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