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TGF-beta isoform signaling regulates secondary transition and mesenchymal-induced endocrine development in the

Sidhartha S Tulachan1, Eri Tei, Mark Hembree

  • 1Children's Hospital of Pittsburgh, University of Pittsburgh School of Medicine, 3705 Fifth Avenue, Pittsburgh, PA 15213-2583, USA.

Developmental Biology
|April 10, 2007
PubMed

Insights

Transforming growth factor-beta (TGF-beta) signaling restrains embryonic pancreatic cell growth and differentiation. Inhibiting TGF-beta allows unchecked progression towards endocrine cell development, particularly during the secondary transition phase.

Area of Science:

  • Developmental Biology
  • Endocrinology
  • Cell Signaling

Background:

  • Transforming growth factor-beta (TGF-beta) superfamily signaling is crucial for embryonic development, including pancreatic organogenesis.
  • Previous research on TGF-beta's role in pancreatic development has yielded conflicting results.
  • Understanding TGF-beta's specific functions in pancreatic lineage selection is essential.

Purpose of the Study:

  • To investigate the role of TGF-beta isoform signaling in embryonic pancreatic differentiation and lineage selection.
  • To elucidate how TGF-beta signaling influences the development of endocrine cells within the embryonic pancreas.

Main Methods:

  • Localization of TGF-beta receptors (RI, RII, ALK1) in the developing embryonic pancreas.
  • Functional inactivation of TGF-beta signaling using dominant-negative TGF-beta type II receptor overexpression in mice.
  • Inhibition of TGF-beta ligand activity using neutralizing antibodies in pancreatic organ culture.
  • In vitro recombination experiments with transgenic pancreatic mesenchyme and wild-type epithelium.

Main Results:

  • Disruption of TGF-beta signaling led to an increase in endocrine precursors and proliferating endocrine cells.
  • Abnormal accumulation of endocrine cells near developing ducts was observed upon TGF-beta signaling disruption.
  • Inhibition of TGF-beta signaling in organ culture also increased the number of endocrine-positive cells.
  • In vitro recombination studies showed increased endocrine cell differentiation when TGF-beta signaling was modulated.

Conclusions:

  • TGF-beta signaling plays a critical role in suppressing the growth and differentiation of pancreatic epithelial cells towards the endocrine lineage.
  • Inhibition of TGF-beta signaling during embryonic development permits unchecked progression of pancreatic epithelial cells into the endocrine lineage.
  • TGF-beta receptor II (TGF-beta RII) in ducts and islets likely downregulates beta-cell production from embryonic ducts.

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