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.
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Acknowledgements
We are grateful to the women who participated in this study. The study was supported by a Diabetes Australia Research Trust (DART) Award, the Victorian State Government Operational Infrastructure Support and the Australian Government NHMRC IRIISS. JMW takes full responsibility for the work as a whole, including the study design, access to data and the decision to submit and publish the manuscript.
Author contributions
This study was designed by JMW, LCH, PEO and PM. JMW, GN, KN, CB, JW and MC performed the experiments. GKS and RL analysed the microarray data. JMW collated and analysed the results and drafted the manuscript. All authors edited the manuscript and approved it for submission.
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Wentworth, J., Naselli, G., Ngui, K. et al. GM3 ganglioside and phosphatidylethanolamine-containing lipids are adipose tissue markers of insulin resistance in obese women. Int J Obes 40, 706–713 (2016). https://doi.org/10.1038/ijo.2015.223
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DOI: https://doi.org/10.1038/ijo.2015.223
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