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Related Concept Videos

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...
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...
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...
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...
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...
Pathophysiology of Diabetes01:20

Pathophysiology of Diabetes

Diabetes mellitus is a chronic metabolic disorder characterized by hyperglycemia. The four categories of diabetes are type 1 diabetes, type 2 diabetes, other specific types of diabetes, and gestational diabetes.
Type 1 diabetes is characterized by autoimmune-mediated destruction of pancreatic β cells, with environmental factors potentially triggering this process in genetically susceptible individuals. Despite many not having a family history, certain genes increase susceptibility, suggesting a...

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Related Experiment Video

Updated: May 12, 2026

Glucose Uptake Measurement and Response to Insulin Stimulation in In Vitro Cultured Human Primary Myotubes
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Glucose Uptake Measurement and Response to Insulin Stimulation in In Vitro Cultured Human Primary Myotubes

Published on: June 25, 2017

Purinergic signalling and diabetes.

Geoffrey Burnstock1, Ivana Novak

  • 1Autonomic Neuroscience Centre, University College Medical School, Rowland Hill Street, London, NW3 2PF, UK. g.burnstock@ucl.ac.uk

Purinergic Signalling
|April 3, 2013
PubMed
Summary

Purinergic signaling, involving nucleotides and nucleosides, plays a key role in pancreas function and nutrient homeostasis. Dysregulation of this system is increasingly linked to diabetes mellitus, impacting various organs.

Area of Science:

  • Endocrinology and Metabolism
  • Cellular Signaling
  • Molecular Biology

Background:

  • The pancreas is crucial for nutrient breakdown, sensing, and hormone release, maintaining whole-body nutrient homeostasis.
  • Diabetes mellitus disrupts this balance, leading to cellular dysfunction.
  • The global incidence of type 1 and type 2 diabetes is rising, highlighting the need for understanding underlying mechanisms.

Purpose of the Study:

  • To review the role of purinergic signaling in pancreatic function and its alterations in diabetes.
  • To explore the involvement of nucleotides and nucleosides as extracellular signaling molecules in the pancreas.
  • To provide a historical perspective on purinergic signaling and its receptors in diabetes-affected systems.

Main Methods:

  • Review of existing literature on diabetes, pancreatic physiology, and purinergic signaling.

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A High-content In Vitro Pancreatic Islet β-cell Replication Discovery Platform
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A High-content In Vitro Pancreatic Islet β-cell Replication Discovery Platform

Published on: July 16, 2016

Related Experiment Videos

Last Updated: May 12, 2026

Glucose Uptake Measurement and Response to Insulin Stimulation in In Vitro Cultured Human Primary Myotubes
08:03

Glucose Uptake Measurement and Response to Insulin Stimulation in In Vitro Cultured Human Primary Myotubes

Published on: June 25, 2017

A High-content In Vitro Pancreatic Islet β-cell Replication Discovery Platform
09:35

A High-content In Vitro Pancreatic Islet β-cell Replication Discovery Platform

Published on: July 16, 2016

  • Analysis of the role of purinergic signaling in the pancreas and other affected tissues/organ systems.
  • Examination of common and divergent roles of nucleotide and nucleoside receptors across organ systems.
  • Main Results:

    • Emerging evidence indicates nucleotides act as critical extracellular signaling molecules in purinergic signaling cascades within the pancreas.
    • Changes in purinergic signaling are associated with diabetes, affecting pancreatic cells (endocrine, exocrine, stromal, immune) and other organs.
    • Purinergic signaling pathways are integral to the complex events regulating insulin secretion and action.

    Conclusions:

    • Purinergic signaling is fundamental to pancreatic function and nutrient homeostasis, with its dysregulation implicated in diabetes.
    • Understanding purinergic signaling in diabetes offers insights into therapeutic strategies targeting specific organs or disorders.
    • This review provides a comprehensive overview to aid in developing novel drugs for diabetes management.