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Related Concept Videos

Cells and Secretions of the Pancreas01:16

Cells and Secretions of the Pancreas

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The pancreas, a vital organ within the abdominal cavity, plays dual roles in the digestive and endocrine systems, collaborating with exocrine and endocrine cells to maintain optimal digestion and blood sugar levels.
Exocrine function is carried out by acinar cells, organized into clusters known as acini. These cells contribute to digestion by releasing substantial quantities of enzyme-rich, alkaline digestive juices.
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Glucose Homeostasis: Pancreatic Islets and Insulin Secretion01:27

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The pancreatic islets comprising only 1%-2% of the volume are highly vascularized and innervated mini-organs. They contain five endocrine cell types, including β cells that secrete insulin, which is synthesized as a single polypeptide chain, preproinsulin, processed to proinsulin, and finally to insulin and C-peptide. This process is complex and regulated, involving the Golgi complex, the endoplasmic reticulum, and the secretory granules of the β cell.
Insulin and C-peptide are...
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Cell Specific Gene Expression01:58

Cell Specific Gene Expression

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Multicellular organisms contain a variety of structurally and functionally distinct cell types, but the DNA in all the cells originated from the same parent cells. The differences in the cells can be attributed to the differential gene expression. Liver cells, whose functions include detoxification of blood, production of bile to metabolize fats, and synthesis of proteins essential for metabolism, must express a specific set of genes to perform their functions. Gene expression also varies with...
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Insulin Secretory Vesicles01:05

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Insulin secretory vesicles release insulin to stimulate blood glucose uptake and regulate carbohydrate metabolism. When the blood glucose levels increase, glucose enters the pancreatic β-islet cells through glucose transporters. Once inside, glucose is metabolized through glycolysis, the citric acid cycle, and the electron transport chain, producing ATP. This increase in ATP concentration closes ATP-sensitive potassium channels, leading to depolarization of the membrane and the opening of...
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Related Experiment Video

Updated: Sep 7, 2025

Single-cell Transcriptomic Analyses of Mouse Pancreatic Endocrine Cells
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Single-cell transcriptome and accessible chromatin dynamics during endocrine pancreas development.

Eliza Duvall1, Cecil M Benitez2, Krissie Tellez2

  • 1Laboratory of Receptor Biology and Gene Expression, Center for Cancer Research, National Cancer Institute, NIH, Bethesda, MD 20892.

Proceedings of the National Academy of Sciences of the United States of America
|June 23, 2022
PubMed
Summary

Researchers mapped gene regulatory networks controlling mouse pancreatic endocrine cell development. They identified key transcription factors and DNA interactions, suggesting Neurog3 acts as a pioneer factor, crucial for cell lineage specification and potential diabetes therapies.

Keywords:
ATAC-seqNeurog3pancreasscRNA-seq

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Area of Science:

  • Developmental biology
  • Genomics
  • Cell biology

Background:

  • Understanding gene regulatory networks is crucial for cell-type specification.
  • Single-cell analyses advance the study of rare cell lineages and hierarchical decisions.

Purpose of the Study:

  • To molecularly analyze mouse pancreatic endocrine cell differentiation.
  • To identify transcription factor networks and regulatory DNA interactions governing cell lineage specification.

Main Methods:

  • Single-cell transcriptomics
  • Chromatin accessibility assays with genetic labeling
  • Cytometry-based cell purification
  • Genomic footprint analysis

Main Results:

  • Discovered transcription factor networks delineating beta, alpha, and delta cell lineages.
  • Identified transcription factor-regulatory DNA interactions at high resolution.
  • Proposed Neurog3 as a pioneer transcription factor for pancreatic endocrine lineage specification.

Conclusions:

  • Detailed molecular mechanisms of pancreatic endocrine cell development were elucidated.
  • Findings provide insights into transcription factor roles in cell fate determination.
  • Results may inform strategies for generating therapeutic endocrine cells for diabetes treatment.