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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...
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...
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...
Insulin: The Receptor and Signaling Pathways01:28

Insulin: The Receptor and Signaling Pathways

Insulin action is mediated through a receptor tyrosine kinase, akin to the IGF-1 receptor. The number of receptors per cell varies significantly, from 40 on erythrocytes to 300,000 on adipocytes and hepatocytes. The insulin receptor consists of linked α/β subunit dimers, forming a heterotetramer glycoprotein with two extracellular α subunits and two β subunits spanning the membrane. The α subunits inhibit the inherent tyrosine kinase activity of the β subunits, but this inhibition is released...
Regulation of Food Intake01:30

Regulation of Food Intake

Short-term regulation of food intake primarily involves neural signals from the gastrointestinal (GI) tract, blood nutrient levels, and GI tract hormones. Communication between the gut and brain via vagal nerve fibers plays a significant role in evaluating the contents of the gut. Clinical studies have shown that protein ingestion produces a more prolonged response in these nerve fibers compared to an equivalent amount of glucose. Additionally, the activation of stretch receptors caused by GI...
Insulin: Dosing Regimen and Adverse Effects01:16

Insulin: Dosing Regimen and Adverse Effects

Insulin-replacement therapy usually includes both long-acting insulin (basal) and short-acting insulin (to cater to postprandial needs). In a diverse group of type 1 diabetes patients, the average daily insulin dose is typically 0.5-0.7 units/kg body weight. However, obese patients and pubertal adolescents may need more due to insulin resistance.
The basal dose constitutes about 40%-50% of the total daily dose, with the rest as premeal insulin. The mealtime insulin dose should mirror...

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Related Experiment Video

Updated: Jun 25, 2026

Homogeneous Time-resolved Förster Resonance Energy Transfer-based Assay for Detection of Insulin Secretion
07:30

Homogeneous Time-resolved Förster Resonance Energy Transfer-based Assay for Detection of Insulin Secretion

Published on: May 10, 2018

Nutrient modulation of insulin secretion.

Nimbe Torres1, Lilia Noriega, Armando R Tovar

  • 1Departamento de Fisiología de la Nutrición, Instituto Nacional de Ciencias Médicas y Nutrición Vasco de Quiroga, Mexico DF 14000, Mexico.

Vitamins and Hormones
|March 3, 2009
PubMed
Summary
This summary is machine-generated.

Nutrients like glucose and fatty acids regulate insulin secretion, a complex process involving metabolism and signaling pathways. Understanding these nutrient-induced insulin responses is crucial for metabolic health.

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Last Updated: Jun 25, 2026

Homogeneous Time-resolved Förster Resonance Energy Transfer-based Assay for Detection of Insulin Secretion
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Published on: May 10, 2018

Measuring Relative Insulin Secretion using a Co-Secreted Luciferase Surrogate
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Measuring Relative Insulin Secretion using a Co-Secreted Luciferase Surrogate

Published on: June 25, 2019

A Method for Mouse Pancreatic Islet Isolation and Intracellular cAMP Determination
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A Method for Mouse Pancreatic Islet Isolation and Intracellular cAMP Determination

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Area of Science:

  • Endocrinology
  • Metabolism
  • Cell Biology

Background:

  • Nutrients regulate pancreatic beta-cell insulin secretion to maintain glucose homeostasis.
  • Glucose is a primary nutrient secretagogue, while other nutrients and hormones modulate this response.
  • Nutrient metabolism is central to complex insulin secretion signaling pathways.

Purpose of the Study:

  • To elucidate the intricate mechanisms by which various nutrients regulate insulin secretion.
  • To explore the roles of fatty acids, amino acids, and hormones in insulin release.
  • To understand the impact of nutrient metabolism on beta-cell function.

Main Methods:

  • Analysis of nutrient metabolism and signaling pathways in beta-cells.
  • Investigation of insulin secretion in response to glucose, fatty acids, and amino acids.
  • Examination of hormonal modulation and long-term nutrient exposure effects.

Main Results:

  • Glucose alone stimulates insulin release; fatty acids have a lesser effect without glucose.
  • Fatty acids with glucose increase insulin release via malonyl-CoA and LC-CoA pathways.
  • Long-term nutrient exposure can lead to glucolipotoxicity and reduced insulin secretion.
  • Amino acids regulate insulin secretion through ATP synthesis and signaling pathways (mTOR, AMPK, SIRT4).
  • Dietary compounds like isoflavones also influence insulin secretion.

Conclusions:

  • Nutrient-induced insulin secretion is a complex, multifactorial process involving intricate metabolic and signaling networks.
  • Dysregulation of nutrient sensing and metabolism can impair insulin secretion and contribute to metabolic disease.
  • Further research into nutrient-specific signaling is vital for understanding and treating metabolic disorders.