Roles of ATP-sensitive K+ channels in cell survival and differentiation in the endocrine pancreas

Related Experiment Video

Updated: Oct 9, 2026

Efficient Differentiation of Pluripotent Stem Cells to NKX6-1+ Pancreatic Progenitors
09:23

Efficient Differentiation of Pluripotent Stem Cells to NKX6-1+ Pancreatic Progenitors

Published on: March 7, 2017

T Miki1, T Iwanaga, K Nagashima

  • 1Department of Molecular Medicine, Chiba University Graduate School of Medicine, Japan.

Diabetes
|March 29, 2001
PubMed

Insights

ATP-sensitive potassium (K(ATP)) channels are crucial for endocrine pancreas cell survival and differentiation. Genetically engineered mice lacking Kir6.2 or expressing a dominant-negative form show impaired islet architecture and increased apoptosis.

Area of Science:

  • Endocrinology
  • Molecular Biology
  • Genetics

Background:

  • ATP-sensitive potassium (K(ATP)) channels are vital for cellular functions.
  • Kir6.2 is a key subunit of K(ATP) channels in the endocrine pancreas.
  • Understanding K(ATP) channel roles is essential for metabolic research.

Purpose of the Study:

  • To elucidate the specific roles of K(ATP) channels in the endocrine pancreas.
  • To investigate the impact of impaired K(ATP) channel function on pancreatic islet cells.
  • To analyze the consequences of Kir6.2 disruption on beta-cell survival and islet architecture.

Main Methods:

  • Development of two genetically engineered mouse models: Kir6.2G132S Tg (dominant-negative Kir6.2 in beta-cells) and Kir6.2-/- (Kir6.2 null).
  • Assessment of K(ATP) channel function, pancreatic islet architecture, and cell populations.
  • Utilized TdT-mediated dUTP nick-end labeling (TUNEL) to detect apoptosis.

Main Results:

  • Both mouse models exhibited abnormal pancreatic islet architecture, including altered alpha-cell distribution.
  • Kir6.2G132S Tg mice showed a marked age-dependent decrease in beta-cell number, while Kir6.2-/- mice had a slight decrease.
  • Increased apoptosis was observed in both models, suggesting K(ATP) channels are critical for cell survival.

Conclusions:

  • K(ATP) channels, through Kir6.2, play a significant role in maintaining endocrine pancreas cell survival.
  • Disruption of K(ATP) channel function impacts beta-cell maintenance and islet cell differentiation.
  • These findings highlight the importance of K(ATP) channels in pancreatic islet homeostasis.

More Related Videos

Isolating and Analyzing Cells of the Pancreas Mesenchyme by Flow Cytometry05:38

Isolating and Analyzing Cells of the Pancreas Mesenchyme by Flow Cytometry

Published on: January 28, 2017

Single-cell Transcriptomic Analyses of Mouse Pancreatic Endocrine Cells10:05

Single-cell Transcriptomic Analyses of Mouse Pancreatic Endocrine Cells

Published on: September 30, 2018

Related Concept Videos

Cells and Secretions of the Pancreas01:16

Cells and Secretions of the Pancreas

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.
Concurrently, the dispersed clusters of endocrine cells throughout the...
Glucose Homeostasis: Pancreatic Islets and Insulin Secretion01:27

Glucose Homeostasis: Pancreatic Islets and Insulin Secretion

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 co-secreted in...
Tissue Renewal without Stem Cells01:23

Tissue Renewal without Stem Cells

After cellular or tissue damage, the resident stem cells present in the human body can locally repair and regenerate the damaged tissue or organ. However, even though some tissues do not have stem cells, they can repair and regenerate with the help of pre-existing cells. For example, beta cells of the pancreas and hepatocytes of the liver can divide to renew and regenerate the tissue. Here, both cell division and cell death are well regulated by homeostasis.
However, failure of such a system...
Insulin Secretory Vesicles01:05

Insulin Secretory Vesicles

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...
Hormones Regulating Blood Glucose01:16

Hormones Regulating Blood Glucose

Insulin is released by beta cells of the pancreas when blood glucose levels are high. It facilitates glucose absorption and utilization in insulin-dependent cells with insulin receptors on their plasma membranes. Insulin promotes glucose uptake by increasing the number of glucose transport proteins in the cell membrane, allowing glucose to enter the cell. As a result, glucose utilization and ATP production are enhanced.
In addition to accelerating glucose uptake and utilization, insulin has...
Cell Specific Gene Expression01:58

Cell Specific Gene Expression

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...