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  • Bariatric and Metabolic Surgery Original Article
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The soluble form of the receptor of advanced glycation endproducts increases after bariatric surgery in morbid obesity

International Journal of Obesity volume 36, pages 1412–1417 (2012)Cite this article

Subjects

Abstract

Objective:

The increased cardiovascular (CV) disease risk in patients with morbid obesity (MO) cannot be fully explained by traditional CV risk factors. Activation of the receptor of Advanced Glycation Endproducts (RAGE) leads to inflammation via the NF κβ (nuclear factor κβ) pathway. The soluble form of RAGE (sRAGE), which is present in plasma, can bind to ligands of RAGE and avoids interaction of RAGE with proinflammatory ligands. We investigated sRAGE levels in patients with MO and compared them with healthy lean controls (CO), before and after bariatric surgery.

Design:

We conducted a cross–sectional study and a 24-month longitudinal study.

Subjects:

We included 85 patients (mean age: 41±12 years; mean body mass index (BMI): 45.4±7.9 kg m−2) with MO in comparison with 40 CO (mean age: 42±13 years; mean BMI: 26.0±5.5 kg m−2). All patients were investigated before and 2 years after bariatric surgery. Apart from weight and CV risk markers (blood pressure, lipids), a glucose tolerance test (75 g), renal and inflammation parameters were assessed. sRAGE levels were assessed by a commercial ELISA. To investigate the associations of the observed reductions of values, delta (Δ) of parameters were calculated.

Results:

Patients with MO had significant lower sRAGE levels than CO: 1010±514 vs 1501±674 pg ml−1; P<0.001. In the longitudinal study, sRAGE levels increased significantly after bariatric surgery from 1010±514 to 1261±710 pg ml−1; P=0.008. In the correlation analysis, ΔsRAGE levels were associated with Δ1-h and Δ2-h postprandial glucose, Δfasting insulin, Δ2-h postprandial insulin, ΔHOMA (homeostatic model assessment)-insulin resistance (ΔHOMA-IR), Δγ-glutamyl transferase and Δtriglycerides. In a multivariate model, Δ1-h and Δ2-h postprandial glucose, Δ2-h postprandial insulin and ΔHOMA-IR predicted ΔsRAGE.

Conclusion:

Patients with MO have significantly lower sRAGE levels compared with non-obese CO, but sRAGE levels increase significantly after weight loss induced by bariatric surgery. As high sRAGE levels inhibit the activation of inflammatory pathways, our results might help understand the beneficial effects of bariatric surgery regarding CV morbidity and mortality.

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Acknowledgements

We thank the Metabolic Staff of the Outpatients Department for Morbid Obesity of Rudolfstiftung Hospital, Vienna for their helpful work.

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Authors and Affiliations

  1. Department of Medicine I, Rudolfstiftung Hospital, Vienna, Austria

    J M Brix, F Höllerl, H-P Kopp & G Schernthaner

  2. Department of Medicine II, Division of Angiology, Medical University of Vienna, Vienna, Austria

    G H Schernthaner

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Correspondence to G Schernthaner.

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Brix, J., Höllerl, F., Kopp, HP. et al. The soluble form of the receptor of advanced glycation endproducts increases after bariatric surgery in morbid obesity. Int J Obes 36, 1412–1417 (2012). https://doi.org/10.1038/ijo.2012.107

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