Expression and function of mouse Sox17 gene in the specification of gallbladder/bile-duct progenitors during early foregut morphogenesis

Mami Uemura, Kenshiro Hara, Hiroshi Shitara, Rie Ishii, Naoki Tsunekawa, Yutaroh Miura, Masamichi Kurohmaru, Choji Taya, Hiromichi Yonekawa, Masami Kanai-Azuma, Yoshiakira Kanai

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

In early-organogenesis-stage mouse embryos, the posteroventral foregut endoderm adjacent to the heart tube gives rise to liver, ventral pancreas and gallbladder. Hepatic and pancreatic primordia become specified in the posterior segment of the ventral foregut endoderm at early somite stages. The mechanisms for demarcating gallbladder and bile duct primordium, however, are poorly understood. Here, we demonstrate that the gallbladder and bile duct progenitors are specified in the paired lateral endoderm domains outside the heart field at almost the same timing as hepatic and pancreatic induction. In the anterior definitive endoderm, Sox17 reactivation occurs in a certain population within the most lateral domains posterolateral to the anterior intestinal portal (AIP) lip on both the left and right sides. During foregut formation, the paired Sox17-positive domains expand ventromedially to merge in the midline of the AIP lip and become localized between the liver and pancreatic primordia. In Sox17-null embryos, these lateral domains are missing, resulting in a complete loss of the gallbladder/bile-duct structure. Chimera analyses revealed that Sox17-null endoderm cells in the posteroventral foregut do not display any gallbladder/bile-duct molecular characters. Our findings show that Sox17 functions cell-autonomously to specify gallbladder/bile-duct in the mouse embryo.

Original languageEnglish
Pages (from-to)357-363
Number of pages7
JournalBiochemical and biophysical research communications
Volume391
Issue number1
DOIs
Publication statusPublished - 2010 Jan 1
Externally publishedYes

Keywords

  • Bile duct
  • Endoderm
  • Gallbladder
  • Mouse
  • Pancreas
  • Sox17

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology

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