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pubmed-article:15489540pubmed:abstractTextThe resistin gene is expressed in adipocytes and encodes a protein proposed to link obesity and type 2 diabetes. Increased plasma FFA is associated with insulin resistance. We examined the effect of separate FFAs on the expression of resistin mRNA in cultured murine 3T3-L1 adipocytes. The FFAs tested did not increase resistin expression, whereas both arachidonic acid (AA) and eicosapentaenoic acid (EPA) reduced resistin mRNA levels. AA was by far the most potent FFA, reducing resistin mRNA levels to approximately 20% of control at 60-250 muM concentration. Selective inhibitors of cyclooxygenase-1 and of mitogen-activated protein kinase kinase counteracted AA-induced reduction in resistin mRNA levels. Transient overexpression of sterol-regulatory element binding protein-1a (SREBP-1a) activated the resistin promoter, but there was no reduction in the abundance of approximately 65 kDa mature SREBP-1 after AA exposure. Actinomycin D as well as cycloheximide abolished the AA-induced reduction of resistin mRNA levels, indicating dependence on de novo transcription and translation. Our data suggest that reductions in resistin mRNA levels involve a destabilization of the resistin mRNA molecule. An inhibitory effect of AA and EPA on resistin expression may explain the beneficial effect of ingesting PUFAs on insulin sensitivity.lld:pubmed
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pubmed-article:15489540pubmed:articleTitleResistin expression in 3T3-L1 adipocytes is reduced by arachidonic acid.lld:pubmed
pubmed-article:15489540pubmed:affiliationDepartment of Nutrition, Institute of Basic Medical Sciences, University of Oslo, Oslo, Norway.lld:pubmed
pubmed-article:15489540pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:15489540pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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