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Overexpression of the Pdx-1 homeodomain transcription factor impairs glucose metabolism in cultured rat hepatocytes.

Authors
  • Pillich, Rudolf Tito
  • Scarsella, Gianfranco
  • Risuleo, Gianfranco
Type
Published Article
Journal
Molecules
Publisher
MDPI AG
Publication Date
Jan 01, 2008
Volume
13
Issue
10
Pages
2659–2673
Identifiers
DOI: 10.3390/molecules13102659
PMID: 18971862
Source
Medline
License
Unknown

Abstract

The Pdx-1 transcription factor plays crucial functions both during pancreas development and in the adult beta cells. Previous studies have indicated that ectopic Pdx-1 expression in liver or intestinal primary and immortalized cells is sufficient to promote activation of insulin gene expression. This work is focused on the molecular and physiological consequences of Pdx-1 overexpression in liver cells. We present evidence that Pdx-1 affects the level of expression of one of the four mammalian hexokinase isozymes. These are glucose phosphorylating enzymes involved in essential cellular functions such as glucose sensing, metabolic energy production and apoptosis. Specifically, our data show that over-expression of Pdx-1 in cultured hepatocytes is able to repress the expression of hexokinase 2 (Hxk 2) and the phenomenon is mediated via binding of Pdx-1 to a specific sequence on the Hxk 2 gene promoter. As a consequence, liver cells over-expressing Pdx-1 present interesting alterations concerning glucose metabolism.

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