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Efficient Generation of Pancreas/Duodenum Homeobox Protein 1+ Posterior Foregut/Pancreatic Progenitors from hPSCs in Adhesion Cultures
Published on: March 27, 2019
PDX-1 and the pancreas
Satoshi Ashizawa1, F Charles Brunicardi, Xiao-Ping Wang
1Michael E. DeBakey Department of Surgery, Baylor College of Medicine, Houston, Texas, USA.
Insights
The transcription factor pancreatic duodenal homeobox 1 (PDX-1) is crucial for pancreas development and islet cell function. Its absence leads to severe developmental defects and diabetes, highlighting its role in metabolic health.
Area of Science:
- Endocrinology
- Developmental Biology
- Molecular Biology
Background:
- Transcription factors regulate embryonic development and islet cell function.
- Pancreatic duodenal homeobox 1 (PDX-1) is vital for endocrine pancreas development and function.
- PDX-1 is expressed in embryonic pancreatic buds and adult islet cells.
Purpose of the Study:
- To elucidate the dual role of PDX-1 in pancreatic development and islet cell physiology.
- To understand the molecular mechanisms of pancreas formation involving PDX-1.
- To explore the implications of PDX-1 function for treating pancreatic diseases.
Main Methods:
- Review of existing literature on PDX-1 function in mouse models.
- Analysis of PDX-1 expression patterns during embryonic development.
- Examination of gene transcription activation by PDX-1 in islet cells.
Main Results:
- Null mutation of PDX-1 in mice causes pancreatic agenesis and early death due to hyperglycemia.
- Heterozygous PDX-1 mice exhibit pancreatic development but develop diabetes.
- PDX-1 activates key genes essential for islet function, including insulin and glucokinase.
Conclusions:
- PDX-1 plays a critical dual role in both pancreatic organogenesis and mature islet cell function.
- Understanding PDX-1 mechanisms offers potential therapeutic targets for diabetes and pancreatic cancer.
- Further research into PDX-1 is essential for advancing treatments for endocrine pancreatic disorders.
Abstract:
Many transcription factors are critical for ensuring proper embryonic development of the endocrine pancreas and normal islet function. The transcription factor pancreatic duodenal homeobox 1 (PDX-1) is uniformly expressed in early pancreatic buds of embryos as well as the beta and delta cells of the islets of Langerhans. PDX-1 has also been found in dispersed endocrine cells of the duodenum in adults and plays a key role in pancreas formation. It has been reported that null mutation of PDX-1 in mice results in a failure of the pancreatic bud to expand; thus, the mice die 2-3 days after birth from hyperglycemia and dehydration. Heterozygous PDX-1 mice developed a pancreas but were diabetic. It has been shown that PDX-1 is required for maintaining the pancreatic islet functions by activating gene transcriptions including insulin, somatostatin (SST), islet amyloid polypeptide, glucose transporter type 2, and glucokinase. PDX-1 serves a dual role in pancreatic development. It initially contributes to pancreatic formation during embryogenesis and subsequently regulates the pancreatic islet cell physiology in mature islet cells. Understanding the underlying molecular mechanisms of pancreas formation, especially the function of PDX-1, may contribute to the enhanced treatment and prevention of debilitating diseases such as diabetes, insulinomas, and pancreatic carcinomas.
