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De Novo Formation of Insulin-Producing “Neo-β Cell Islets” from Intestinal Crypts

Yi-Ju Chen, Stacy R. Finkbeiner, Daniel Weinblatt and 11 more

Cell Reports · 2014 · CC BY

doi:10.1016/j.celrep.2014.02.013

Abstract

The ability to interconvert terminally differentiated cells could serve as a powerful tool for cell-based treatment of degenerative diseases, including diabetes mellitus. To determine which, if any, adult tissues are competent to activate an islet β cell program, we performed an in vivo screen by expressing three β cell "reprogramming factors" in a wide spectrum of tissues. We report that transient intestinal expression of these factors-Pdx1, MafA, and Ngn3 (PMN)-promotes rapid conversion of intestinal crypt cells into endocrine cells, which coalesce into "neoislets" below the crypt base. Neoislet cells express insulin and show ultrastructural features of β cells. Importantly, intestinal neoislets are glucose-responsive and able to ameliorate hyperglycemia in diabetic mice. Moreover, PMN expression in human intestinal "organoids" stimulates the conversion of intestinal epithelial cells into β-like cells. Our results thus demonstrate that the intestine is an accessible and abundant source of functional insulin-producing cells.

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