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Cell Metab. 2009 Mar;9(3):252-64. doi: 10.1016/j.cmet.2009.01.011.

The role of peroxisome proliferator-activated receptor gamma coactivator-1 beta in the pathogenesis of fructose-induced insulin resistance.

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  • 1Department of Internal Medicine, Yale University School of Medicine, New Haven, CT 06536-8012, USA.

Abstract

Peroxisome proliferator-activated receptor gamma coactivator-1 beta (PGC-1beta) is known to be a transcriptional coactivator for SREBP-1, the master regulator of hepatic lipogenesis. Here, we evaluated the role of PGC-1beta in the pathogenesis of fructose-induced insulin resistance by using an antisense oligonucletoide (ASO) to knockdown PGC-1beta in liver and adipose tissue. PGC-1beta ASO improved the metabolic phenotype induced by fructose feeding by reducing expression of SREBP-1 and downstream lipogenic genes in liver. PGC-1beta ASO also reversed hepatic insulin resistance induced by fructose in both basal and insulin-stimulated states. Furthermore, PGC-1beta 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-1beta in the pathogenesis of fructose-induced insulin resistance and suggest that PGC-1beta inhibition may be a therapeutic target for treatment of NAFLD, hypertriglyceridemia, and insulin resistance associated with increased de novo lipogenesis.

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PMID:
19254570
[PubMed - indexed for MEDLINE]
PMCID:
PMC3131094
Free PMC Article

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