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Related Concept Videos

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...
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...
Type I Diabetes II: Pathophysiology01:26

Type I Diabetes II: Pathophysiology

Type 1 diabetes mellitus arises from an immune-mediated destruction of pancreatic β-cells, resulting in an absolute deficiency of insulin. This process develops in genetically susceptible individuals when autoimmunity, environmental exposures, and immunologic dysregulation converge to trigger a targeted attack on the insulin-producing cells of the pancreas. The β-cells are located within the islets of Langerhans and are essential for regulating blood glucose by facilitating cellular uptake of...
Type II Diabetes II: Pathophysiology01:24

Type II Diabetes II: Pathophysiology

PathophysiologyType 2 diabetes mellitus (T2DM ) is a chronic metabolic disorder characterized by insulin resistance and progressive pancreatic β-cell dysfunction, leading to impaired glucose homeostasis. It results from interactions among genetic predisposition, environmental factors, and metabolic stressors, such as overnutrition and a sedentary lifestyle.Insulin Resistance and Glucose DysregulationEarly T2DM involves insulin resistance in skeletal muscle, adipose tissue, and the liver.
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...
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...

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Related Experiment Video

Updated: Jul 2, 2026

Analysis of Beta-cell Function Using Single-cell Resolution Calcium Imaging in Zebrafish Islets
08:50

Analysis of Beta-cell Function Using Single-cell Resolution Calcium Imaging in Zebrafish Islets

Published on: July 3, 2018

The islet beta-cell: fuel responsive and vulnerable.

Christopher J Nolan1, Marc Prentki

  • 1Department of Endocrinology, The Canberra Hospital, Medical School, The Australian National University, Garran, ACT 2605, Australia. christopher.nolan@anu.edu.au

Trends in Endocrinology and Metabolism: TEM
|September 9, 2008
PubMed
Summary
This summary is machine-generated.

Pancreatic beta-cells sense nutrients to regulate insulin secretion. However, their vulnerability to nutrient toxicity may lead to beta-cell failure and type 2 diabetes, with glycerolipid/fatty acid cycling playing a key role.

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Area of Science:

  • Endocrinology
  • Metabolic research
  • Cell biology

Background:

  • Pancreatic beta-cells are crucial for regulating blood glucose by sensing nutrients and responding to neurohormonal signals.
  • Nutrient sensing triggers metabolic activation, leading to insulin biosynthesis and secretion.
  • Beta-cells have limited protection against nutrient toxicity, predisposing them to failure.

Purpose of the Study:

  • To explore the biochemical mechanisms of beta-cell signaling in response to glucose, amino acids, and fatty acids.
  • To discuss beta-cell nutrient detoxification pathways.
  • To highlight the role of glycerolipid/fatty acid cycling in beta-cell function and dysfunction.

Main Methods:

  • Literature review of recent insights into beta-cell signaling and nutrient metabolism.
  • Discussion of biochemical pathways involved in nutrient sensing and detoxification.
  • Emphasis on the role of glycerolipid/fatty acid cycling.

Main Results:

  • Detailed biochemical basis of beta-cell response to glucose, amino acids, and fatty acids.
  • Insights into the mechanisms of beta-cell nutrient detoxification.
  • Emerging evidence implicating glycerolipid/fatty acid cycling in beta-cell function.

Conclusions:

  • Understanding beta-cell nutrient sensing and detoxification is critical for addressing type 2 diabetes.
  • Glycerolipid/fatty acid cycling is a key process in beta-cell nutrient metabolism and protection.
  • Further research into these pathways may reveal therapeutic targets for diabetes.