Abstract
Purpose
Type 2 diabetes develops in the presence of chronic overnutrition and genetic susceptibility, and causes insulin resistance and relative insulin deficiency. We hypothesized that islet transplantation can improve insulin sensitivity by modifying the mediators of insulin sensitivity in the pancreas, liver, muscle, and adipose tissues.
Methods
Eight-week-old male mice were used as both recipients and donors in this study. To induce type 2 diabetes with partial β-cell failure, the mice were fed a high-fat diet for 4 weeks and then injected with low-dose streptozotocin. Approximately 400 islet cells from a donor mouse were injected into the renal capsule of a recipient mouse for islet transplantation. After 6 weeks following transplantation, the mediators of insulin sensitivity in the pancreas, liver, muscle, and adipose tissues were quantitatively compared between islet-transplanted and non-transplanted groups.
Results
Intravenous glucose tolerance test showed that whereas the non-transplanted mice failed to show notable reductions in the glucose level, the islet-transplanted mice showed significant reductions in the serum glucose level to ~200 mg/dL at 6 weeks after islet transplantation. The islet-transplanted mice showed significantly higher Matsuda index and significantly lower HOMA-IR than did the non-transplanted mice, thus signifying improved insulin sensitivity.
Conclusions
Islet transplantation resulted in improvements in multiple indices of insulin sensitivity in a murine model of type 2 diabetes. Islet transplantation may be utilized to improve insulin sensitivity in patients with type 2 diabetes.
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Acknowledgements
We thank Dr Joon Seo Lim from the Scientific Publications Team at Asan Medical Center for his editorial assistance in preparing this manuscript.
Funding
This research was performed with grants from the National Research Foundation of Korea (2017R1D1A1B03031027) and Asan Institute for Life Sciences (2020-0022).
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SS, CHJ, KYH, and DJH conceived and designed the research. MYC, Y-MW, and MJK performed the experiments. All authors analysed the data and edited and revised the manuscript. MYC and SJL prepared the figures. SS, CHJ, and HK drafted the manuscript. SS is the guarantor of this work.
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Choi, M.Y., Lim, S.J., Kim, M.J. et al. Islet isograft transplantation improves insulin sensitivity in a murine model of type 2 diabetes. Endocrine 72, 660–671 (2021). https://doi.org/10.1007/s12020-021-02655-8
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DOI: https://doi.org/10.1007/s12020-021-02655-8