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Published 28 October 2002. doi:10.1083/jcb.200203074
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© The Rockefeller University Press, 0021-9525/2002/10/303 $5.00
The Journal of Cell Biology, Volume 159, Number 2, 303-312


Article

Recapitulation of embryonic neuroendocrine differentiation in adult human pancreatic duct cells expressing neurogenin 3

Yves Heremans1, Mark Van De Casteele1, Peter in't Veld1, Gerard Gradwohl2, Palle Serup3, Ole Madsen3, Daniel Pipeleers1 and Harry Heimberg1

1 Diabetes Research Center, Brussels Free University (VUB), B-1090 Brussels, Belgium
2 Institut National de la Santé et de la Recherche Médicale, U381, Development and Pathology of the Digestive System, F-67200 Strasbourg, France
3 Hagedorn Research Institute, DK-2820 Gentofte, Denmark

Address correspondence to Harry Heimberg, Diabetes Research Center, Brussels Free University (VUB), Laarbeeklaan 103, B-1090 Brussels, Belgium. Tel.: 32-2-477-4548. Fax: 32-2-477-4545. E-mail: hheimber{at}vub.vub.ac.be

Regulatory proteins have been identified in embryonic development of the endocrine pancreas. It is unknown whether these factors can also play a role in the formation of pancreatic endocrine cells from postnatal nonendocrine cells. The present study demonstrates that adult human pancreatic duct cells can be converted into insulin-expressing cells after ectopic, adenovirus-mediated expression of the class B basic helix-loop-helix factor neurogenin 3 (ngn3), which is a critical factor in embryogenesis of the mouse endocrine pancreas. Infection with adenovirus ngn3 (Adngn3) induced gene and/or protein expression of NeuroD/ß2, Pax4, Nkx2.2, Pax6, and Nkx6.1, all known to be essential for ß-cell differentiation in mouse embryos. Expression of ngn3 in adult human duct cells induced Notch ligands Dll1 and Dll4 and neuroendocrine- and ß-cell–specific markers: it increased the percentage of synaptophysin- and insulin-positive cells 15-fold in ngn3-infected versus control cells. Infection with NeuroD/ß2 (a downstream target of ngn3) induced similar effects. These data indicate that the Delta-Notch pathway, which controls embryonic development of the mouse endocrine pancreas, can also operate in adult human duct cells driving them to a neuroendocrine phenotype with the formation of insulin-expressing cells.

Key Words: neurogenin 3; islets of langerhans; transdifferentiation; insulin; diabetes mellitus


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