Demethylation of Induced Pluripotent Stem Cells from Type 1 Diabetic Patients Enhances Differentiation into Functional Pancreatic β Cells

Overview

Journal J Biol Chem

Specialty Biochemistry

Date 2017 Apr 1

PMID 28360105

Citations 24

Authors

Gohar S Manzar

Eun-Mi Kim

Nicholas Zavazava

Affiliations

Soon will be listed here.

Abstract

Type 1 diabetes (T1D) can be managed by transplanting either the whole pancreas or isolated pancreatic islets. However, cadaveric pancreas is scarcely available for clinical use, limiting this approach. As such, there is a great need to identify alternative sources of clinically usable pancreatic tissues. Here, we used induced pluripotent stem (iPS) cells derived from patients with T1D to generate glucose-responsive, insulin-producing cells (IPCs) via 3D culture. Initially, T1D iPS cells were resistant to differentiation, but transient demethylation treatment significantly enhanced IPC yield. The cells responded to high-glucose stimulation by secreting insulin The shape, size, and number of their granules, as observed by transmission electron microscopy, were identical to those found in cadaveric β cells. When the IPCs were transplanted into immunodeficient mice that had developed streptozotocin-induced diabetes, they promoted a dramatic decrease in hyperglycemia, causing the mice to become normoglycemic within 28 days. None of the mice died or developed teratomas. Because the cells are derived from "self," immunosuppression is not required, providing a much safer and reliable treatment option for T1D patients. Moreover, these cells can be used for drug screening, thereby accelerating drug discovery. In conclusion, our approach eliminates the need for cadaveric pancreatic tissue.

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