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The effect of retinoic acid on the proportion of insulin cells in the developing chick pancreas

C Penny1, B Kramer

  • 1Department of Anatomical Sciences, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa.

In Vitro Cellular & Developmental Biology. Animal
|February 26, 2000
PubMed

Insights

All-trans-retinoic acid influences chick pancreas development. Lower doses of retinoic acid significantly increased insulin-producing cells in developing chick pancreatic explants compared to higher doses or controls.

Area of Science:

  • Developmental biology
  • Endocrinology
  • Cell biology

Background:

  • Pancreatic development involves complex cellular differentiation.
  • Insulin-producing beta-cells are crucial for glucose homeostasis.
  • Retinoic acid is a key signaling molecule in embryonic development.

Purpose of the Study:

  • To investigate the effect of all-trans-retinoic acid on insulin cell differentiation in developing chick pancreas.
  • To determine the dose-dependent impact of retinoic acid on the proportion of insulin cells.

Main Methods:

  • Culturing dorsal pancreatic bud endoderm from 5-day-old chick embryos on Matrigel.
  • Treating explants with varying concentrations of all-trans-retinoic acid (10^-6 M or 10^-5 M) in Ham's F12 medium with ITS.
  • Identifying endocrine cell types using immunocytochemistry and quantifying insulin cells relative to glucagon cells.

Main Results:

  • All-trans-retinoic acid exhibited a dose-dependent effect on insulin cell proportion.
  • The lower dose (10^-6 M) of retinoic acid more than doubled the proportion of insulin cells compared to the higher dose (10^-5 M).
  • Both retinoic acid doses resulted in a higher proportion of insulin cells than control grafts.

Conclusions:

  • All-trans-retinoic acid can modulate the differentiation of insulin-producing cells in the developing chick pancreas.
  • The effect of retinoic acid is concentration-dependent, with lower doses promoting insulin cell development.
  • These findings highlight retinoic acid's role in pancreatic endocrine cell fate determination.

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