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Rbp-j regulates expansion of pancreatic epithelial cells and their differentiation into exocrine cells during mouse

Junji Fujikura1, Kiminori Hosoda, Yoshiya Kawaguchi

  • 1Department of Medicine and Clinical Science, Kyoto University Graduate School of Medicine, Sakyo-ku, Kyoto, Japan.

Developmental Dynamics : an Official Publication of the American Association of Anatomists
|September 13, 2007
PubMed

Insights

Recombining protein J (Rbp-j) inactivation in pancreatic cells impacts development. This study shows Rbp-j regulates epithelial growth, Pdx1 expression, and acinar cell differentiation in mid-pancreatic development.

Area of Science:

  • Developmental Biology
  • Cell Signaling
  • Genetics

Background:

  • Notch signaling is crucial for cell fate determination in numerous tissues.
  • Previous studies generated mice with pancreas-specific Rbp-j knockout using Pdx.cre, showing premature differentiation.
  • Rbp-j (Recombining protein J) is a key transcription factor in Notch signaling pathways.

Purpose of the Study:

  • To investigate the role of Rbp-j in pancreatic development using a Ptf1a.cre mouse model.
  • To compare the developmental effects of Rbp-j inactivation at different stages.
  • To elucidate the specific functions of Rbp-j in epithelial growth and cell differentiation during pancreas organogenesis.

Main Methods:

  • Generation of Rbp-j conditional knockout mice using Ptf1a.cre and Rbp-j(f/f) alleles.
  • Analysis of pancreatic tissue at embryonic day 13.5 (E13.5) and E15.5.
  • Assessment of gene expression (Hes1, Pdx1) and cell differentiation markers.
  • Evaluation of epithelial growth and cell proliferation rates.

Main Results:

  • In Rbp-j(f/f) Ptf1a.cre mice, reduced Hes1 expression and epithelial growth were observed at E13.5, with minimal premature endocrine differentiation.
  • At E15.5, Pdx1 expression was repressed, and acinar cell differentiation was reduced.
  • Increased acinar cell proliferation was noted during the perinatal period in these mice.

Conclusions:

  • Rbp-j inactivation in Ptf1a-expressing cells affects mid-pancreatic development.
  • Rbp-j plays a role in preventing premature endocrine cell differentiation.
  • Rbp-j is essential for regulating epithelial growth, Pdx1 expression, and acinar cell differentiation during pancreas development.

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