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Efficient Differentiation of Pluripotent Stem Cells to NKX6-1+ Pancreatic Progenitors
Published on: March 7, 2017
Rat endocrine pancreatic development in relation to two homeobox gene products (Pdx-1 and Nkx 6.1)
1Department of Molecular Cell Biology, Statens Seruminstitut, Copenhagen, Denmark.
Insights
The homeodomain proteins Pdx-1 and Nkx 6.1 are crucial for pancreatic development. Nkx 6.1, like Pdx-1, plays a key role in the maturation of insulin-producing beta cells.
Area of Science:
- Developmental biology
- Endocrinology
- Molecular biology
Background:
- Pancreatic development involves precise regulation of gene expression.
- Homeodomain proteins like Pdx-1 are known regulators of pancreatic organogenesis.
Purpose of the Study:
- To investigate the distribution and role of Pdx-1 and Nkx 6.1 during rat pancreas development.
- To determine the relationship between these proteins and the differentiation of insulin-producing beta cells.
Main Methods:
- Immunohistochemical analysis of developing rat pancreas.
- Detection of nuclear staining for Pdx-1 and Nkx 6.1 proteins.
- Co-localization studies with insulin and glucagon.
Main Results:
- Pdx-1 and Nkx 6.1 were initially expressed in most pancreatic anlage epithelial cells.
- Nkx 6.1 expression became restricted to beta cells, while Pdx-1 also appeared in other islet cells and duodenal epithelium.
- Insulin-only-producing cells showed strong nuclear Pdx-1 and Nkx 6.1 staining, unlike earlier insulin/glucagon co-expressing cells.
Conclusions:
- Nkx 6.1 is important for pancreatic development and mature beta cell function, similar to Pdx-1.
- The expression patterns suggest a role for Nkx 6.1 in beta cell differentiation and maturation.
- These findings contribute to understanding the molecular mechanisms of pancreatic islet development.
Abstract:
We studied the distribution of the homeodomain proteins Pdx-1 and Nkx 6.1 in the developing rat pancreas. During early development, nuclear staining for both Pdx-1 and Nkx 6.1 occurred in most epithelial cells of the pancreatic anlage. Subsequently, Nkx 6.1 became more beta-cell-restricted, and Pdx-1 also occurred in other islet cell types and in the duodenal epithelium. During early pancreatic development, cells co-storing insulin and glucagon were regularly detected. The vast majority of these did not possess nuclear staining for either Pdx-1 or Nkx 6.1. Subsequently, cells storing insulin only appeared. Such cells displayed strongly Pdx-1- and Nkx 6.1-positive nuclei. Therefore, Nkx 6.1, like Pdx-1, may be an important factor in pancreatic development and in mature insulin cell function.
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