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Related Concept Videos

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...
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...
Glucagon-like Receptor Agonists01:24

Glucagon-like Receptor Agonists

Incretins include glucagon-like peptide-1 (GLP-1) and glucose-dependent insulinotropic polypeptide (GIP), which stimulate insulin secretion post-meals. In type 2 diabetes, GIP's efficacy is reduced, making GLP-1 a viable drug target. GIP originates from preproGIP.
GLP-1, when administered in high doses intravenously, triggers insulin secretion, inhibits glucagon release, slows gastric emptying, reduces food intake, and restores normal insulin secretion. However, its rapid inactivation by the...
Glucose Homeostasis: Regulation of Blood Glucose01:02

Glucose Homeostasis: Regulation of Blood Glucose

Carbohydrates consumed through foods are converted into glucose, a crucial energy source for the body. In the prandial state, high blood glucose levels stimulate the secretion of insulin from the pancreas. Insulin inhibits hepatic glucose production and stimulates glucose uptake and metabolism by muscle and adipose tissue. The excess glucose is converted into glycogen and stored in the liver and muscles.
During fasting, when blood glucose levels are low, the pancreas secretes glucagon. it...
Hypoglycemia and Glucagon01:15

Hypoglycemia and Glucagon

Without prolonged fasting, healthy individuals maintain blood glucose levels above 3.5 mM due to a well-adapted neuroendocrine counterregulatory system that effectively prevents acute hypoglycemia, a potentially life-threatening condition. The primary clinical scenarios for hypoglycemia encompass diabetes treatment, inappropriate production of endogenous insulin or insulin-like substances by tumors, and the use of glucose-lowering agents in non-diabetic individuals. Notably, hypoglycemia in the...
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...

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Related Experiment Video

Updated: May 29, 2026

Mechanisms Underlying Gut Hormone Secretion Using the Isolated Perfused Rat Small Intestine
07:00

Mechanisms Underlying Gut Hormone Secretion Using the Isolated Perfused Rat Small Intestine

Published on: February 26, 2019

Cellular glucose availability and glucagon-like peptide-1.

Jae-Hyung Park1, Yung E Earm, Dae-Kyu Song

  • 1Department of Physiology, Keimyung University School of Medicine, 2800 Dalgubeoldae-Ro, Dalseo-Gu, Daegu 704-701, Republic of Korea.

Progress in Biophysics and Molecular Biology
|September 13, 2011
PubMed
Summary
This summary is machine-generated.

Glucagon-like peptide (GLP)-1 enhances cellular glucose availability, improving insulin secretion and beta-cell survival. This review explores GLP-1

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Hyperinsulinemic-euglycemic Clamps in Conscious, Unrestrained Mice
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Mixed Primary Cultures of Murine Small Intestine Intended for the Study of Gut Hormone Secretion and Live Cell Imaging of Enteroendocrine Cells
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Related Experiment Videos

Last Updated: May 29, 2026

Mechanisms Underlying Gut Hormone Secretion Using the Isolated Perfused Rat Small Intestine
07:00

Mechanisms Underlying Gut Hormone Secretion Using the Isolated Perfused Rat Small Intestine

Published on: February 26, 2019

Hyperinsulinemic-euglycemic Clamps in Conscious, Unrestrained Mice
11:10

Hyperinsulinemic-euglycemic Clamps in Conscious, Unrestrained Mice

Published on: November 16, 2011

Mixed Primary Cultures of Murine Small Intestine Intended for the Study of Gut Hormone Secretion and Live Cell Imaging of Enteroendocrine Cells
09:16

Mixed Primary Cultures of Murine Small Intestine Intended for the Study of Gut Hormone Secretion and Live Cell Imaging of Enteroendocrine Cells

Published on: April 20, 2017

Area of Science:

  • Endocrinology
  • Metabolism
  • Molecular Biology

Background:

  • Glucagon-like peptide (GLP)-1 and gastric inhibitory polypeptide (GIP) are incretin hormones potentiating insulin secretion.
  • GLP-1 mimetics and DPP-4 inhibitors are established treatments for type 2 diabetes (T2D).
  • GLP-1 plays crucial roles in T2D, including appetite reduction, enhanced insulin secretion, and beta-cell survival.

Purpose of the Study:

  • To review the signaling pathways and clinical relevance of GLP-1 in enhancing cellular glucose availability.
  • To describe a novel mechanism regulating GLP-1 for glucokinase activity based on recent research.
  • To highlight the potential of GLP-1 in treating T2D, particularly in overcoming glucose resistance in diabetic tissues.

Main Methods:

  • Literature review of GLP-1 signaling pathways and clinical applications in T2D.
  • Analysis of recent research findings on GLP-1 regulation of glucokinase activity.
  • Discussion of GLP-1's role in glucose uptake, utilization, and storage in various tissues.

Main Results:

  • GLP-1 sensitizes beta-cells to glucose, enhances insulin secretion, and promotes glucose uptake and utilization in insulin-sensitive tissues.
  • GLP-1 supports neuronal function and survival by increasing glucose availability.
  • A novel mechanism regulating GLP-1's effect on glucokinase activity has been identified.

Conclusions:

  • GLP-1 enhances cellular glucose availability, supporting essential cellular functions and survival, particularly in the context of T2D.
  • GLP-1's multifaceted actions, including improving insulin sensitivity and beta-cell function, make it a promising therapeutic agent for T2D.
  • Understanding GLP-1's regulatory mechanisms, such as its control over glucokinase, is key to optimizing its therapeutic potential in managing T2D.