Abstract
Most patients with type 1 diabetes rely on multiple daily insulin injections to maintain blood glucose control. However, insulin injections carry the risk of inducing hypoglycemia and do not eliminate diabetic complications. We sought to develop and evaluate a regulatable cell-based system for delivery of insulin to treat diabetes. We generated two intestinal cell lines in which human insulin expression is controlled by mifepristone. Insulin mRNA expression was dependent on the mifepristone dose and incubation time and cells displayed insulin and C-peptide immunoreactivity and glucose-induced insulin release following mifepristone treatment. Cell transplantation followed by mifepristone administration reversed streptozotocin (STZ)-induced diabetes in mice, and this effect was dependent on the mifepristone dose delivered. These data support the notion that engineering regulatable insulin expression within a cell already equipped for regulated secretion may be efficacious for the treatment of insulin-dependent diabetes.
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Acknowledgements
TJK is a Michael Smith Foundation for Health Research (MSFHR) senior scholar and received grant funding from the Juvenile Diabetes Research Foundation and MSFHR. SU received post-doctoral fellowships from the Canadian Institutes of Health Research and MSFHR, and RDW received scholarship support from MSFHR and the Natural Sciences and Engineering Research Council of Canada. We thank Anastasia Vlasova for expert technical assistance and acknowledge the National Hormones and Peptides Program, National Institutes of Diabetes and Digestive and Kidney Diseases, and Dr. A.F. Parlow for provision of mifepristone.
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The authors declare that they have no competing financial interests.
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Unniappan, S., Wideman, R.D., Donald, C. et al. Treatment of diabetes by transplantation of drug-inducible insulin-producing gut cells. J Mol Med 87, 703–712 (2009). https://doi.org/10.1007/s00109-009-0465-0
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DOI: https://doi.org/10.1007/s00109-009-0465-0