Intestinal Glucose Absorption Was Reduced by Vertical Sleeve Gastrectomy via Decreased Gastric Leptin Secretion
The unique effects of gastric resection after vertical sleeve gastrectomy (VSG) on type 2 diabetes mellitus remain unclear. This work aimed to investigate the effects of VSG on gastric leptin expression and intestinal glucose absorption in high-fat diet-induced obesity.
Male C57BL/6J mice were fed a high-fat diet (HFD) to induce obesity. HFD mice were randomized into VSG and sham-operation groups, and the relevant parameters were measured at 8 weeks postoperation.
Higher gastric leptin expression and increased intestinal glucose transport were observed in the HFD mice. Furthermore, VSG reduced gastric leptin expression and the intestinal absorption of alimentary glucose. Both exogenous leptin replenishment during the oral glucose tolerance test (OGTT) and the addition of leptin into the everted isolated jejunum loops in vitro restored the glucose transport capacity in VSG-operated mice, and this effect was abolished when the glucose transporter GLUT2 was blocked with phloretin. Moreover, phloretin almost completely suppressed glucose transport in the HFD mice. Intestinal immunohistochemistry in the obese mice showed increased GLUT2 and diminished sodium glucose co-transporter 1 (SGLT-1) in the apical membrane of enterocytes. Decreased GLUT2 and enhanced SGLT1 were observed following VSG. VSG also reduced the phosphorylation status of protein kinase C isoenzyme β II (PKCβ II) in the jejunum, which was stimulated by the combination of leptin and glucose.
Our data demonstrated that the decreased secretion of gastric leptin in VSG results in a decrease in intestinal glucose absorption via modulation of GLUT2 translocation.
KeywordsVertical sleeve gastrectomy Obesity Absorption Leptin
This study was supported by National Key Basic Research Program of China (No. 2015CB5540007); National Natural Science Foundation of China (No. 81472740, 81200276, and 81700488); Natural Science Foundation of Hubei Province of China (No. 2014CFA060 and 2015CFB710); Research Fund of Public Welfare in Health Industry, Health and Family Plan Committee of China (No. 201402015); Natural Science Foundation of Huazhong University of Science and Technology (No. 5001530030), and Health and Family Planning Youth Project Foundation of Hubei Province, China (No. WJ2015Q001).
Compliance with Ethical Standards
All animal studies (including the mice euthanasia procedure) were conducted in compliance with the regulations and guidelines of Tongji Medicine College institutional animal care committee.
Conflict of Interest
The authors declare that they have no conflict of interest.
A Statement of Animal Rights/Ethical Approval
All procedures in this study were approved by the Ethics Committee for Animal Research of Tongji Medicine College.
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