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Diabetologia. 2015 Feb;58(2):374-83. doi: 10.1007/s00125-014-3423-5. Epub 2014 Oct 28.

Nutritional strategy to prevent fatty liver and insulin resistance independent of obesity by reducing glucose-dependent insulinotropic polypeptide responses in mice.

Author information

1
Department of Clinical Nutrition, German Institute of Human Nutrition, Arthur-Scheunert-Allee 114-116, 14558, Nuthetal, Germany.

Abstract

AIMS/HYPOTHESIS:

High intake of carbohydrates, particularly sucrose, in western societies is associated with the development of non-alcoholic fatty liver (NAFL) and diabetes mellitus. It is unclear whether this is related primarily to the carbohydrate quantity or to the hormonal responses, particularly glucose-dependent insulinotropic polypeptide (GIP), which is released in the proximal intestine. Therefore, we investigated the role of GIP by comparing two glucose-fructose dimers, sucrose and Palatinose (isomaltulose), resorbed proximally or distally.

METHODS:

The glycaemic and incretin responses to sucrose and Palatinose were studied by oral gavage and meal tests. We then analysed phenotypic and metabolic diet-induced changes in C57Bl/6J mice exposed to isoenergetic diets differing in carbohydrate type. Studies were repeated in GIP receptor knockout (Gipr(-/-)) mice and their wild-type littermates.

RESULTS:

Compared with sucrose, Palatinose intake resulted in slower glucose absorption and reduced postprandial insulin and GIP levels. After 22 weeks, Palatinose feeding prevented hepatic steatosis (48.5%) compared with sucrose and improved glucose tolerance, without differences in body composition and food intake. Ablation of GIP signalling in Gipr(-/-) mice completely prevented the deleterious metabolic effects of sucrose feeding. Furthermore, our microarray analysis indicated that sucrose increased 2.3-fold the hepatic expression of Socs2, which is involved in the growth hormone signalling pathway and participates in the development of NAFL.

CONCLUSIONS/INTERPRETATION:

Our results suggest that the site of glucose absorption and the GIP response determine liver fat accumulation and insulin resistance. GIP may play a role in sucrose induced fatty liver by regulating the expression of Socs2.

PMID:
25348610
DOI:
10.1007/s00125-014-3423-5
[Indexed for MEDLINE]

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