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The transcriptional co-repressor Grg3/Tle3 promotes pancreatic endocrine progenitor delamination and β-cell

David E Metzger1, Malgorzata Gasperowicz, Florian Otto

  • 1Institute for Regenerative Medicine, Institute for Diabetes Obesity and Metabolism, Epigenetics Program, Department of Cell and Developmental Biology, University of Pennsylvania School of Medicine,1056 BRB II/III, 421 Curie Boulevard, Philadelphia, PA 19104, USA. dmetzger@upenn.edu

Development (Cambridge, England)
|March 22, 2012
PubMed

Insights

Groucho-related gene 3 (Grg3) is crucial for pancreatic endocrine cell development. Grg3 suppresses E-cadherin, enabling progenitor delamination and differentiation into essential pancreatic beta-cells.

Area of Science:

  • Developmental biology
  • Endocrinology
  • Molecular genetics

Background:

  • Pancreatic beta-cells develop from Ngn3(+) endocrine progenitors in the embryonic pancreas.
  • E-cadherin downregulation is necessary for endocrine cell emergence, but the underlying mechanisms are unclear.
  • Groucho/TLE co-repressors, like Grg3 (Tle3), regulate cell differentiation, but their specific roles in pancreas development are not well-defined.

Purpose of the Study:

  • To investigate the role of Grg3 in pancreatic endocrine progenitor delamination and beta-cell development.
  • To elucidate the molecular mechanism by which Grg3 influences E-cadherin expression during pancreas organogenesis.

Main Methods:

  • Analysis of Grg3 expression patterns in the developing pancreas.
  • Generation and culture of Grg3-null embryonic pancreatic explants.
  • Assessment of endocrine cell differentiation and progenitor delamination in Grg3-deficient pancreata.

Main Results:

  • Grg3 is expressed in pancreatic beta-cells and Ngn3(+) progenitor descendants.
  • Grg3 knockout embryos exhibit embryonic lethality with placental defects.
  • Grg3-deficient pancreatic explants show significantly reduced endocrine cell differentiation due to impaired progenitor delamination.
  • Grg3 directly suppresses E-cadherin gene expression.

Conclusions:

  • Grg3 is essential for the delamination of endocrine progenitors from the pancreatic epithelium.
  • Grg3-mediated suppression of E-cadherin is a critical step for enabling beta-cell development.
  • Understanding Grg3's function provides insights into generating beta-cells from stem cells.

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