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Nkx2.2 activates the ghrelin promoter in pancreatic islet cells.

Authors
  • Hill, Jonathon T1
  • Chao, Christina S
  • Anderson, Keith R
  • Kaufman, Fernanda
  • Johnson, Christopher W
  • Sussel, Lori
  • 1 Department of Genetics and Development, Columbia University, New York, New York 10032, USA.
Type
Published Article
Journal
Molecular Endocrinology
Publisher
The Endocrine Society
Publication Date
Feb 01, 2010
Volume
24
Issue
2
Pages
381–390
Identifiers
DOI: 10.1210/me.2009-0360
PMID: 19965928
Source
Medline
Language
English
License
Unknown

Abstract

Nkx2.2 is an essential regulator of pancreatic endocrine differentiation. Nkx2.2-null mice are completely devoid of beta-ells and have a large reduction of alpha- and PP cells. In the place of these islet populations, there is a corresponding increase in the ghrelin-positive epsilon-cells. Molecular studies have indicated that Nkx2.2 functions as an activator and repressor to regulate islet cell fate decisions. To determine whether Nkx2.2 is solely important for islet cell fate decisions or also has the capability to control ghrelin at the promoter level, we studied the transcriptional regulation of the ghrelin promoter within the pancreas, in vitro and in vivo. These studies demonstrate that both of the previously identified transcriptional start sites in the ghrelin promoter are active within the embryonic pancreas; however, the long transcript is preferentially up-regulated in the Nkx2.2-null pancreas. We also show that the promoter region between -619 and -488 bp upstream of the translational start site is necessary for repression of ghrelin in alphaTC1 and betaTC6 cells. Surprisingly, we also show that Nkx2.2 is able to bind to and activate the ghrelin promoter in several cell lines that do or do not express endogenous ghrelin. Together, these results suggest that the up-regulation of ghrelin expression in the Nkx2.2-null mice is not due to loss of repression of the ghrelin promoter in the nonghrelin islet populations. Furthermore, Nkx2.2 may contribute to the activation of ghrelin in mature islet epsilon-cells.

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