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Gastric bypass simultaneously improves adipose tissue function and insulin-dependent type 2 diabetes mellitus

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Abstract

Objective

The underlying causes of type 2 diabetes (T2DM) remain poorly understood. Adipose tissue dysfunction with high leptin, inflammation, and increased oxidative stress may play a pivotal role in T2DM development in obese patients. Little is known about the changes in the adipose tissue after Roux-Y gastric bypass (RYGB) in non-severely obese patients (BMI < 35 kg/m2) and since these patients have more T2DM-associated complications than obese patients (“obesity paradox”), we investigated changes in adipose tissue function in a cohort of BMI <35 kg/m2 with insulin-dependent T2DM after RYGB surgery which resolves T2DM.

Methods

Twenty patients with insulin-dependent T2DM and BMI <35 kg/m2 underwent RYGB. Insulin-resistance, leptin, oxidative stress, and cytokines were determined over 24 months. Expression of cytokines and NF-kappaB pathway genes were measured in leukocytes (PBMC). Adipose tissue inflammation was examined histologically preoperatively and 24 months after RGYB in subcutaneous adipose tissue.

Results

Insulin-resistance, leptin, oxidative stress as well as adipose tissue inflammation decreased significantly after RYGB. Similarly, systemic inflammation was reduced and peripheral blood mononuclear cells (PBMCs) were reprogrammed towards an M2-type inflammation. Loss of BMI correlated with leptin levels (r = 0.891, p < 0.0001), insulin resistance (r = 0.527, p = 0.003), and oxidative stress (r = 0.592, p = 0.016). Leptin correlated with improved insulin resistance (r = 0.449, p = 0.032) while reduced leptin showed a strong association with improved oxidative stress (r = 0.809, p = 0.001). Lastly, reduced oxidative stress correlated strongly with improved insulin-resistance (r = 0.776, p = 0.001).

Conclusions

RYGB improves adipose tissue function and inflammation. Leptin as marker for adipose tissue dysfunction may be the mediating factor between insulin resistance and oxidative stress and thereby likely improving T2DM.

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Acknowledgements

This study was supported by the German Research Society (DFG) awarded to Prof. P. Nawroth (SFB 1118).

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Authors and Affiliations

  1. From the Department of General, Visceral, and Transplantation Surgery, University of Heidelberg, Im Neuenheimer Feld 110, 69120, Heidelberg, Germany

    Adrian T. Billeter, Barbara Israel, Katharina M. Scheurlen, Markus W. Büchler & Beat P. Müller-Stich

  2. From the Department of Internal Medicine I and Clinical Chemistry, University of Heidelberg, Heidelberg, Germany

    Spiros Vittas, Asa Hidmark, Thomas H. Fleming & Stefan Kopf

Authors
  1. Adrian T. Billeter
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  2. Spiros Vittas
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  3. Barbara Israel
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  4. Katharina M. Scheurlen
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  6. Thomas H. Fleming
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  7. Stefan Kopf
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  8. Markus W. Büchler
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  9. Beat P. Müller-Stich
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Correspondence to Beat P. Müller-Stich.

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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.

Informed consent was obtained from all individual participants included in the study.

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None of the authors has any competing financial interests.

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The authors declared that they have no conflict of interest.

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Billeter, A.T., Vittas, S., Israel, B. et al. Gastric bypass simultaneously improves adipose tissue function and insulin-dependent type 2 diabetes mellitus. Langenbecks Arch Surg 402, 901–910 (2017). https://doi.org/10.1007/s00423-017-1601-x

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  • DOI: https://doi.org/10.1007/s00423-017-1601-x

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