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Florentina Negoita

Visiting research fellow

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Impaired glucose transport in inguinal adipocytes after short-term high-sucrose feeding in mice

Author

  • Claes Fryklund
  • Madelene Borg
  • Tobias Svensson
  • Sara Schumacher
  • Florentina Negoita
  • Björn Morén
  • Karin G. Stenkula

Summary, in English

Diets enriched in sucrose severely impair metabolic regulation and are associated with obesity, insulin resistance and glucose intolerance. In the current study, we investigated the effect of 4 weeks high-sucrose diet (HSD) feeding in C57BL6/J mice, with specific focus on adipocyte function. Mice fed HSD had slightly increased adipose tissue mass but displayed similar hepatic triglycerides, glucose and insulin levels, and glucose clearance capacity as chow-fed mice. Interestingly, we found adipose depot-specific differences, where both the non- and insulin-stimulated glucose transports were markedly impaired in primary adipocytes isolated from the inguinal fat depot from HSD-fed mice. This was accompanied by decreased protein levels of both GLUT4 and AS160. A similar but much less pronounced trend was observed in the retroperitoneal depot. In contrast, both GLUT4 expression and insulin-stimulated glucose uptake were preserved in adipocytes isolated from epididymal adipose tissue with HSD. Further, we found a slight shift in cell size distribution towards larger cells with HSD and a significant decrease of ACC and PGC-1α expression in the inguinal adipose tissue depot. Moreover, fructose alone was sufficient to decrease GLUT4 expression in cultured, mature adipocytes. Altogether, we demonstrate that short-term HSD feeding has deleterious impact on insulin response and glucose transport in the inguinal adipose tissue depot, specifically. These changes occur before the onset of systemic glucose dysmetabolism and therefore could provide a mechanistic link to overall impaired energy metabolism reported after prolonged HSD feeding, alone or in combination with HFD.

Department/s

  • Glucose Transport and Protein Trafficking
  • EXODIAB: Excellence in Diabetes Research in Sweden
  • Protein Phosphorylation

Publishing year

2020-04

Language

English

Publication/Series

Journal of Nutritional Biochemistry

Volume

78

Document type

Journal article

Publisher

Elsevier

Topic

  • Endocrinology and Diabetes
  • Cell Biology

Keywords

  • Adipocytes
  • Adipose tissue
  • Fructose
  • Glucose transport
  • GLUT4
  • High-sucrose diet

Status

Published

Research group

  • Glucose Transport and Protein Trafficking
  • Protein Phosphorylation

ISBN/ISSN/Other

  • ISSN: 0955-2863