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Erschienen in: Diabetologia 7/2013

01.07.2013 | Article

Distinct patterns of tissue-specific lipid accumulation during the induction of insulin resistance in mice by high-fat feeding

verfasst von: N. Turner, G. M. Kowalski, S. J. Leslie, S. Risis, C. Yang, R. S. Lee-Young, J. R. Babb, P. J. Meikle, G. I. Lancaster, D. C. Henstridge, P. J. White, E. W. Kraegen, A. Marette, G. J. Cooney, M. A. Febbraio, C. R. Bruce

Erschienen in: Diabetologia | Ausgabe 7/2013

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Abstract

Aims/hypothesis

While it is well known that diet-induced obesity causes insulin resistance, the precise mechanisms underpinning the initiation of insulin resistance are unclear. To determine factors that may cause insulin resistance, we have performed a detailed time-course study in mice fed a high-fat diet (HFD).

Methods

C57Bl/6 mice were fed chow or an HFD from 3 days to 16 weeks and glucose tolerance and tissue-specific insulin action were determined. Tissue lipid profiles were analysed by mass spectrometry and inflammatory markers were measured in adipose tissue, liver and skeletal muscle.

Results

Glucose intolerance developed within 3 days of the HFD and did not deteriorate further in the period to 12 weeks. Whole-body insulin resistance, measured by hyperinsulinaemic–euglycaemic clamp, was detected after 1 week of HFD and was due to hepatic insulin resistance. Adipose tissue was insulin resistant after 1 week, while skeletal muscle displayed insulin resistance at 3 weeks, coinciding with a defect in glucose disposal. Interestingly, no further deterioration in insulin sensitivity was observed in any tissue after this initial defect. Diacylglycerol content was increased in liver and muscle when insulin resistance first developed, while the onset of insulin resistance in adipose tissue was associated with increases in ceramide and sphingomyelin. Adipose tissue inflammation was only detected at 16 weeks of HFD and did not correlate with the induction of insulin resistance.

Conclusions/interpretation

HFD-induced whole-body insulin resistance is initiated by impaired hepatic insulin action and exacerbated by skeletal muscle insulin resistance and is associated with the accumulation of specific bioactive lipid species.
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Metadaten
Titel
Distinct patterns of tissue-specific lipid accumulation during the induction of insulin resistance in mice by high-fat feeding
verfasst von
N. Turner
G. M. Kowalski
S. J. Leslie
S. Risis
C. Yang
R. S. Lee-Young
J. R. Babb
P. J. Meikle
G. I. Lancaster
D. C. Henstridge
P. J. White
E. W. Kraegen
A. Marette
G. J. Cooney
M. A. Febbraio
C. R. Bruce
Publikationsdatum
01.07.2013
Verlag
Springer-Verlag
Erschienen in
Diabetologia / Ausgabe 7/2013
Print ISSN: 0012-186X
Elektronische ISSN: 1432-0428
DOI
https://doi.org/10.1007/s00125-013-2913-1

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