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Related Concept Videos

Hormones Regulating Blood Glucose01:16

Hormones Regulating Blood Glucose

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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...
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Glucagon-like Receptor Agonists01:24

Glucagon-like Receptor Agonists

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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...
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Hypoglycemia and Glucagon01:15

Hypoglycemia and Glucagon

310
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...
310
Glucose Homeostasis: Regulation of Blood Glucose01:02

Glucose Homeostasis: Regulation of Blood Glucose

1.9K
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...
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Insulin: The Receptor and Signaling Pathways01:28

Insulin: The Receptor and Signaling Pathways

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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...
1.4K
Glucose Homeostasis: Pancreatic Islets and Insulin Secretion01:27

Glucose Homeostasis: Pancreatic Islets and Insulin Secretion

1.4K
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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Related Experiment Video

Updated: Aug 14, 2025

Hyperinsulinemic-euglycemic Clamps in Conscious, Unrestrained Mice
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Hyperinsulinemic-euglycemic Clamps in Conscious, Unrestrained Mice

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Metabolic Messengers: glucagon.

Patrick E MacDonald1,2, Patrik Rorsman3,4

  • 1Alberta Diabetes Institute, University of Alberta, Edmonton, AB, Canada.

Nature Metabolism
|January 13, 2023
PubMed
Summary
This summary is machine-generated.

Glucagon, a key hormone regulating blood glucose, is crucial for understanding diabetes. This review highlights glucagon's vital roles in metabolic health and disease, especially during its discovery's centennial.

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Area of Science:

  • Endocrinology
  • Metabolism
  • Diabetes Research

Background:

  • Plasma glucose homeostasis relies on insulin and glucagon.
  • Glucagon, secreted by alpha-cells, increases blood glucose levels.
  • Diabetes mellitus is characterized by impaired insulin secretion and glucagon dysregulation.

Purpose of the Study:

  • To review the critical roles of glucagon in metabolic regulation.
  • To emphasize glucagon's significance in the context of diabetes.
  • To commemorate the 100th anniversary of glucagon discovery.

Main Methods:

  • Literature review of glucagon's function in physiological and pathological states.
  • Analysis of current understanding of glucagon's role in diabetes.
  • Synthesis of historical and contemporary perspectives on glucagon.

Main Results:

  • Glucagon acts as a systemic metabolic messenger.
  • Dysregulation of glucagon contributes significantly to diabetes pathogenesis.
  • Understanding glucagon is essential for managing metabolic disorders.

Conclusions:

  • Glucagon is a vital hormone with multifaceted roles in metabolism.
  • Targeting glucagon pathways offers potential therapeutic strategies for diabetes.
  • Continued research into glucagon is crucial for advancing metabolic disease treatment.