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Peroxisome proliferator-activated receptor-gamma coactivator-1 and insulin resistance: acute effect of fatty acids.

Abstract：

AIMS/HYPOTHESIS:Peroxisome proliferator-activated receptor (PPAR)-gamma coactivator-1 (PPARGC1), a coactivator regulating the transcription of genes involved in oxidative metabolism, is downregulated in patients with type 2 diabetes and in their first-degree relatives. Whether this downregulation is a cause or effect of early aberrations in the development of insulin resistance, such as disturbances in fat metabolism, is unknown. We examined whether lipid-induced insulin resistance was associated with downregulation of expression of skeletal muscle genes involved in oxidative metabolism and mitochondrial biogenesis in humans. MATERIALS AND METHODS:Nine healthy lean male subjects underwent a 6-h hyperinsulinaemic-euglycaemic clamp with simultaneous infusion of either a lipid emulsion or glycerol as a control. Blood was sampled at regular time points and muscle biopsies were taken before and after every test. Intramuscular triacylglycerol (IMTG) content was determined by Oil Red O staining and gene expression was measured by quantitative PCR. RESULTS:Lipid infusion resulted in a approximately 2.7-fold increase in plasma NEFA levels and a 31+/-6% decrease in insulin sensitivity (p=0.001). The infusion of lipids resulted in a approximately 1.6-fold increase in IMTG (p=0.02), whereas during the clamp with glycerol infusion IMTG tended to decrease to approximately 53% of preinfusion levels (p=0.065). Lipid infusion decreased PPARGC1A, PPARGC1B and PPARA expression to approximately 61, 77 and approximately 52% of basal values respectively, whereas expression of uncoupling protein 3 was upregulated 1.8-fold (all p<0.05). CONCLUSIONS/INTERPRETATION:Acute elevation of plasma NEFA levels, leading to muscular fat accumulation and insulin resistance, downregulates PPARGC1A, PPARGC1B and PPARA expression, suggesting that the decrease in PPARGC1 expression observed in the (pre)diabetic state may be the result, rather than the cause of lipid-induced insulin resistance.

journal_name

Diabetologia

journal_title

Diabetologia

authors

Hoeks J,Hesselink MK,Russell AP,Mensink M,Saris WH,Mensink RP,Schrauwen P

doi

10.1007/s00125-006-0369-2

subject

Has Abstract

pub_date

2006-10-01 00:00:00

pages

2419-26

issue

10

eissn

0012-186X

issn

1432-0428

journal_volume

49

pub_type

杂志文章

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