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Int J Obes (Lond). 2016 Apr;40(4):706-13. doi: 10.1038/ijo.2015.223. Epub 2015 Oct 26.

GM3 ganglioside and phosphatidylethanolamine-containing lipids are adipose tissue markers of insulin resistance in obese women.

Author information

1
Population Health and Immunity Division, Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria, Australia.
2
Monash University Centre for Obesity Research and Education, Melbourne, Victoria, Australia.
3
Bioinformatics Division, Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria, Australia.
4
Department of Mathematics and Statistics, University of Melbourne, Carlton, Victoria, Australia.
5
Centre for Physical Activity and Nutrition Research, School of Exercise and Nutrition Sciences, Deakin University, Melbourne, Victoria, Australia.
6
Baker IDI Heart and Diabetes Institute, Melbourne, Victoria, Australia.

Abstract

AIMS:

The association between central obesity and insulin resistance reflects the properties of visceral adipose tissue. Our aim was to gain further insight into this association by analysing the lipid composition of subcutaneous and omental adipose tissue in obese women with and without insulin resistance.

METHODS:

Subcutaneous and omental adipose tissue and serum were obtained from 29 obese non-diabetic women, 13 of whom were hyperinsulinemic. Histology, lipid and gene profiling were performed.

RESULTS:

In omental adipose tissue of obese, insulin-resistant women, adipocyte hypertrophy and macrophage infiltration were accompanied by an increase in GM3 ganglioside and its synthesis enzyme ST3GAL5; in addition, phosphatidylethanolamine (PE) lipids were increased and their degradation enzyme, phosphatidylethanolamine methyl transferase (PEMT), decreased. ST3GAL5 was expressed predominantly in adipose stromovascular cells and PEMT in adipocytes. Insulin resistance was also associated with an increase in PE lipids in serum.

INTERPRETATION:

The relevance of these findings to insulin resistance in humans is supported by published mouse studies, in which adipocyte GM3 ganglioside, increased by the inflammatory cytokine tumour necrosis factor-α, impaired insulin action and PEMT was required for adipocyte lipid storage. Thus in visceral adipose tissue of obese humans, an increase in GM3 ganglioside secondary to inflammation may contribute to insulin resistance and a decrease in PEMT may be a compensatory response to adipocyte hypertrophy.

PMID:
26499445
DOI:
10.1038/ijo.2015.223
[Indexed for MEDLINE]

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