Abstract
Background
Ileal transposition (IT) is a surgical procedure to investigate the role of the distal small intestine in metabolic improvements induced by bariatric/metabolic surgery, which has been applied to some human cases. We performed IT in diet-induced obese rats to investigate the effect of IT on glucose metabolism and β cell senescence.
Methods
Sprague-Dawley rats were fed high-fat diet (60% of total calories from fat) for 12 weeks and randomized into either IT or sham surgery. In the IT group, the distal ileal segment located between 5 and 15 cm proximal to the ileocecal valve was transposed 10 cm distal to the Treitz ligament isoperistaltically. In the sham surgery group, 3 corresponding transections of the intestine were made at the same locations as in IT and reattached in situ. β cell senescence was examined by the expression of two markers in vivo, p53BP1 and p16.
Results
IT did not have a significant effect on body weight and insulin sensitivity, but postprandial insulin secretion was significantly increased. Glucagon-like peptide-1 (GLP-1) and peptide YY secretion were also increased after IT. The histology of the transposed ileum showed distinct hypertrophy with increased GLP-1 positive enteroendocrine cells. Pancreatic β cell area was significantly increased in the IT group. The percentage of p16 or p53BP1 positive senescent β cells was significantly lower in the IT group versus the sham group.
Conclusions
IT improved glucose tolerance in diet-induced obese rats mainly through augmented insulin secretion. This improvement was associated with attenuated β cell senescence.
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Abbreviations
- IT:
-
ileal transposition
- GLP-1:
-
glucagon-like peptide-1
- RYGB:
-
Roux-en-Y gastric bypass
- T2DM:
-
type 2 diabetes mellitus
- PYY:
-
peptide YY
- SASP:
-
senescence-associated secretary phenotype
- HOMA-IR:
-
homeostatic model assessment for insulin resistance
- AUC:
-
area under the curve
- OGTT:
-
oral glucose tolerance test
- GIP:
-
glucose-dependent insulinotropic polypeptide
- TNF-α:
-
tumor necrosis factor-α
- MCP-1:
-
monocyte chemoattractant protein-1
- HIF-1a:
-
hypoxia-inducible factor-1a
- IL-1b:
-
interleukin-1b
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Funding
This research was supported by a grant from the Korea Health Technology R&D Project through the Korea Health Industry Development Institute (KHIDI), funded by the Ministry of Health & Welfare, Republic of Korea (HI14C1277).
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Ahn, C.H., Choi, E.H., Oh, T.J. et al. Ileal Transposition Increases Pancreatic β Cell Mass and Decreases β Cell Senescence in Diet-Induced Obese Rats. OBES SURG 30, 1849–1858 (2020). https://doi.org/10.1007/s11695-020-04406-6
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DOI: https://doi.org/10.1007/s11695-020-04406-6