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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...
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...
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: Biosynthesis, Chemistry, and Preparation01:25

Insulin: Biosynthesis, Chemistry, and Preparation

The endoplasmic reticulum (ER) of pancreatic β-cells synthesizes preproinsulin, which consists of a signal peptide, A and B chains, and a C-peptide. Preproinsulin is then cleaved and folded into proinsulin, which translocates to the Golgi apparatus for sorting and packaging into secretory granules. In these granules, enzymatic clipping generates insulin and C-peptide.
Damage or functional impairment of β-cells inhibits insulin production, leading to diabetes. Diabetes treatment primarily uses...

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Updated: Jun 25, 2026

Isolated Pancreatic Islet Treatment and Apoptosis Measurement
09:36

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Published on: May 2, 2025

Interferon signalling in pancreatic beta cells.

Helen E Thomas1, Kate L Graham, Eveline Angstetra

  • 1St Vincent's Institute, The University of Melbourne Department of Medicine, St. Vincent's Hospital, 41 Victoria Parade, Fitzroy, 3065, Melbourne, Australia. hthomas@svi.edu.au

Frontiers in Bioscience (Landmark Edition)
|March 11, 2009
PubMed
Summary
This summary is machine-generated.

Interferons contribute to type 1 diabetes by promoting immune cell attacks and directly damaging insulin-producing beta cells. Targeting interferon pathways in mouse models offers insights into preventing this autoimmune disease.

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Area of Science:

  • Immunology
  • Endocrinology
  • Molecular Biology

Background:

  • Type 1 diabetes involves the autoimmune destruction of pancreatic beta cells.
  • Immune cell infiltration and inflammatory molecules, including interferons, are present in pancreatic islets during type 1 diabetes progression.
  • Interferons can enhance effector cell activity and directly induce beta cell death.

Purpose of the Study:

  • To review the role of interferons in the pathogenesis of type 1 diabetes.
  • To analyze the outcomes of interventions targeting interferon signaling pathways in preclinical models.
  • To clarify the contribution of interferons to beta cell destruction in type 1 diabetes.

Main Methods:

  • Literature review of studies investigating interferon involvement in type 1 diabetes.
  • Analysis of data from interventions in the non-obese diabetic mouse model.
  • Examination of interferon's direct and indirect effects on beta cells.

Main Results:

  • Interferons are implicated in promoting effector cell-mediated beta cell apoptosis.
  • Interferons can directly induce gene expression changes in islet cells, contributing to cell death.
  • Interferon signaling pathways are critical targets in type 1 diabetes research.

Conclusions:

  • Interferons play a significant role in the development and progression of type 1 diabetes.
  • Modulating interferon activity presents a potential therapeutic strategy for type 1 diabetes.
  • Further research into interferon's precise mechanisms is crucial for effective intervention.