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Langenbeck's Archives of Surgery
Published in: Langenbeck's Archives of Surgery 6/2017

01-09-2017 | ORIGINAL ARTICLE

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

Authors: Adrian T. Billeter, Spiros Vittas, Barbara Israel, Katharina M. Scheurlen, Asa Hidmark, Thomas H. Fleming, Stefan Kopf, Markus W. Büchler, Beat P. Müller-Stich

Published in: Langenbeck's Archives of Surgery | Issue 6/2017

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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.
Appendix
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Metadata
Title
Gastric bypass simultaneously improves adipose tissue function and insulin-dependent type 2 diabetes mellitus
Authors
Adrian T. Billeter
Spiros Vittas
Barbara Israel
Katharina M. Scheurlen
Asa Hidmark
Thomas H. Fleming
Stefan Kopf
Markus W. Büchler
Beat P. Müller-Stich
Publication date
01-09-2017
Publisher
Springer Berlin Heidelberg
Published in
Langenbeck's Archives of Surgery / Issue 6/2017
Print ISSN: 1435-2443
Electronic ISSN: 1435-2451
DOI
https://doi.org/10.1007/s00423-017-1601-x

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