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Related Concept Videos

Type I Diabetes I: Introduction01:12

Type I Diabetes I: Introduction

Type 1 diabetes mellitus is a chronic metabolic disorder characterized by an absolute deficiency of insulin resulting from the autoimmune destruction of pancreatic β-cells. Although it can occur at any age, it is most commonly diagnosed in childhood, adolescence, or early adulthood. The loss of insulin production impairs cellular glucose uptake, resulting in persistent hyperglycemia and necessitating lifelong insulin therapy.Autoimmune Destruction of β-CellsThe hallmark of type 1 diabetes is an...
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...
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...
Diabetes Mellitus: Introduction01:26

Diabetes Mellitus: Introduction

Diabetes mellitus consists of chronic metabolic disorders characterized by persistent hyperglycemia. This elevated blood glucose results from defects in insulin secretion, impaired insulin action, or both. Insulin, produced by pancreatic β-cells, is essential for maintaining glucose homeostasis by facilitating cellular glucose uptake for energy or storage. Disruptions in insulin production or function lead to glucose accumulation in the bloodstream, causing the clinical features and long-term...
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...
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...

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Related Experiment Video

Updated: May 19, 2026

Extraction of Tissue Antigens for Functional Assays
08:32

Extraction of Tissue Antigens for Functional Assays

Published on: September 10, 2012

Islet autoantigens: structure, function, localization, and regulation.

Peter Arvan1, Massimo Pietropaolo, David Ostrov

  • 1Division of Metabolism, Endocrinology & Diabetes, University of Michigan Medical School, Ann Arbor, MI 48105, USA. Parrvan@umich.edu

Cold Spring Harbor Perspectives in Medicine
|August 22, 2012
PubMed
Summary
This summary is machine-generated.

Type 1 diabetes (T1D) autoantigens are linked to pancreatic beta cell secretory pathways. Understanding their biochemical nature and immunogenicity is crucial for uncovering T1D pathogenesis and potential immune tolerance loss mechanisms.

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Extraction of Tissue Antigens for Functional Assays
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Published on: September 10, 2012

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09:15

Electrochemiluminescence Assays for Human Islet Autoantibodies

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11:10

Isolation of Human Islets from Partially Pancreatectomized Patients

Published on: July 30, 2011

Area of Science:

  • Endocrinology and Immunology
  • Molecular Biology
  • Cell Biology

Background:

  • Autoimmune type 1 diabetes (T1D) involves islet autoantigens primarily expressed in pancreatic β cells.
  • Many T1D autoantigens are also found in the neuroendocrine system and are linked to the β cell secretory pathway.
  • These autoantigens are involved in glucose regulation, biogenic amine metabolism, and secretory granule formation.

Purpose of the Study:

  • To investigate the mechanisms of immune tolerance loss in T1D.
  • To evaluate the biochemical nature and immunogenicity of major T1D autoantigens.
  • To explore the link between β cell secretory biology and the generation of antigenic peptides for immune presentation.

Main Methods:

  • Biochemical analysis of key T1D autoantigens.
  • Assessment of autoantigen immunogenicity.
  • Evaluation of potential mechanisms for antigen processing and release from β cells.

Main Results:

  • Identified major T1D autoantigens including (pro)insulin, GAD65, ZnT8, IA2, and ICA69.
  • Established links between autoantigen function and the β cell secretory pathway.
  • Proposed potential pathways for antigen creation and immune presentation in T1D.

Conclusions:

  • The secretory pathway of pancreatic β cells is central to the biology of T1D autoantigens.
  • Understanding autoantigen processing and presentation is key to elucidating T1D pathogenesis.
  • Further research into these mechanisms may reveal targets for therapeutic intervention.