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    Diabetes. 2004 Nov;53(11):2844-54.

    Pioglitazone reduces islet triglyceride content and restores impaired glucose-stimulated insulin secretion in heterozygous peroxisome proliferator-activated receptor-gamma-deficient mice on a high-fat diet.

    Matsui J, Terauchi Y, Kubota N, Takamoto I, Eto K, Yamashita T, Komeda K, Yamauchi T, Kamon J, Kita S, Noda M, Kadowaki T.

    Department of Metabolic Diseases, Graduate School of Medicine, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8655, Japan.

    Heterozygous peroxisome proliferator-activated receptor-gamma (PPAR-gamma)-deficient (PPARgamma(+/-)) mice were protected from high-fat diet-induced insulin resistance. To determine the impact of systemic reduction of PPAR-gamma activity on beta-cell function, we investigated insulin secretion in PPARgamma(+/-) mice on a high-fat diet. Glucose-induced insulin secretion in PPARgamma(+/-) mice was impaired in vitro. The tissue triglyceride (TG) content of the white adipose tissue, skeletal muscle, and liver was decreased in PPARgamma(+/-) mice, but it was unexpectedly increased in the islets, and the increased TG content in the islets was associated with decreased glucose oxidation. Administration of a PPAR-gamma agonist, pioglitazone, reduced the islet TG content in PPARgamma(+/-) mice on a high-fat diet and ameliorated the impaired insulin secretion in vitro. Our results demonstrate that PPAR-gamma protects islets from lipotoxicity by regulating TG partitioning among tissues and that a PPAR-gamma agonist can restore impaired insulin secretion under conditions of islet fat accumulation.

    PMID: 15504964 [PubMed - indexed for MEDLINE]

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