The homeodomain protein PDX1 is required at mid-pancreatic development for the formation of the exocrine pancreas

Michael A. Hale, Hideaki Kagami, Ling Shi, Andrew M. Holland, Hans Peter Elsässer, Robert E Hammer, Raymond J MacDonald

Research output: Contribution to journalArticle

76 Scopus citations

Abstract

The homeoprotein PDX1 is expressed throughout pancreatic development and is thought to play important roles at multiple stages. We describe the properties of a tet-off regulatory scheme to manage the expression of Pdx1 in utero. Cessation of Pdx1 expression at increasingly later gestational times blocked pancreatic development at progressive and morphologically distinct stages and provided the opportunity to assess the requirement for Pdx1 at each stage. Embryonic PDX1 is depleted below effective levels within 1 day of the initiation of doxycycline treatment of pregnant mice. We show that PDX1, which is necessary for early pancreatic development, is also required later for the genesis of acinar tissue, the compartment of the pancreas that produces digestive enzymes. Without PDX1, acini do not form; the precursor epithelium continues to grow and branch, creating a truncated ductal tree comprising immature duct-like cells. The bHLH factor PTF1a, a critical regulator of acinar development, is not expressed and cells producing digestive enzymes are rare. This approach should be generally applicable to study the in vivo functions of other developmental regulators with multiple, temporally distinct roles.

Original languageEnglish (US)
Pages (from-to)225-237
Number of pages13
JournalDevelopmental Biology
Volume286
Issue number1
DOIs
StatePublished - Oct 1 2005

Keywords

  • IPF1
  • Organogenesis
  • PDX1
  • Pancreas
  • Tetracycline
  • Transcription factor

ASJC Scopus subject areas

  • Molecular Biology
  • Developmental Biology
  • Cell Biology

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