The Role of Peroxisome Proliferator-Activated Receptor ? Coactivator-1 ? in the Pathogenesis of Fructose-Induced Insulin Resistance

Yoshio Nagai, Shin Yonemitsu, Derek M Erion, Takanori Iwasaki, Romana Stark, Dirk Weismann, Jianying Dong, Dongyan Zhang, Michael J Jurczak, Michael G Loffler, James Cresswell, Xingxian Yu, Susan F Murray, Sanjay Bhanot, Brett P Monia, Jonathan S Bogan, Varman T Samuel, Gerald I Shulman

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Peroxisome proliferator-activated receptor ? coactivator-1 ? (PGC-1?) is known to be a transcriptional coactivator for SREBP-1, the master regulator of hepatic lipogenesis. Here, we evaluated the role of PGC-1? in the pathogenesis of fructose-induced insulin resistance by using an antisense oligonucletoide (ASO) to knockdown PGC-1? in liver and adipose tissue. PGC-1? ASO improved the metabolic phenotype induced by fructose feeding by reducing expression of SREBP-1 and downstream lipogenic genes in liver. PGC-1? ASO also reversed hepatic insulin resistance induced by fructose in both basal and insulin-stimulated states. Furthermore, PGC-1? ASO increased insulin-stimulated whole-body glucose disposal due to a threefold increase in glucose uptake in white adipose tissue. These data support an important role for PGC-1? in the pathogenesis of fructose-induced insulin resistance and suggest that PGC-1? inhibition may be a therapeutic target for treatment of NAFLD, hypertriglyceridemia, and insulin resistance associated with increased de novo lipogenesis.
Original languageEnglish
Pages (from-to)252 - 264
Number of pages13
JournalCell Metabolism
Issue number3
Publication statusPublished - 2009
Externally publishedYes

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