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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...
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...
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...
Type II Diabetes II: Pathophysiology01:24

Type II Diabetes II: Pathophysiology

PathophysiologyType 2 diabetes mellitus (T2DM ) is a chronic metabolic disorder characterized by insulin resistance and progressive pancreatic β-cell dysfunction, leading to impaired glucose homeostasis. It results from interactions among genetic predisposition, environmental factors, and metabolic stressors, such as overnutrition and a sedentary lifestyle.Insulin Resistance and Glucose DysregulationEarly T2DM involves insulin resistance in skeletal muscle, adipose tissue, and the liver.
Diabetes Mellitus: Overview and Type I Subtype01:22

Diabetes Mellitus: Overview and Type I Subtype

Diabetes mellitus is a chronic metabolic disorder characterized by high blood glucose levels due to inadequate insulin production, insulin resistance, or both. The condition affects millions worldwide and can significantly impact their health and quality of life.
Type 1 diabetes is an autoimmune disease in which the immune system mistakenly attacks and destroys the insulin-producing beta cells in the pancreas. As a result, the body is unable to produce sufficient insulin, and individuals with...
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...

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Related Experiment Video

Updated: Jun 24, 2026

Isolated Pancreatic Islet Treatment and Apoptosis Measurement
09:36

Isolated Pancreatic Islet Treatment and Apoptosis Measurement

Published on: May 2, 2025

Beta cell apoptosis in diabetes.

Helen E Thomas1, Mark D McKenzie, Eveline Angstetra

  • 1St. Vincent's Institute of Medical Research, 41 Victoria Parade, Fitzroy, VIC 3065, Australia. hthomas@svi.edu.au

Apoptosis : an International Journal on Programmed Cell Death
|March 27, 2009
PubMed
Summary
This summary is machine-generated.

Beta cell apoptosis is central to type 1 and type 2 diabetes and islet transplant loss. This review details the molecular triggers and conserved pathways driving beta cell death in these conditions.

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Last Updated: Jun 24, 2026

Isolated Pancreatic Islet Treatment and Apoptosis Measurement
09:36

Isolated Pancreatic Islet Treatment and Apoptosis Measurement

Published on: May 2, 2025

Methods to Assess Beta Cell Death Mediated by Cytotoxic T Lymphocytes
12:12

Methods to Assess Beta Cell Death Mediated by Cytotoxic T Lymphocytes

Published on: June 16, 2011

A High-content In Vitro Pancreatic Islet &#946;-cell Replication Discovery Platform
09:35

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

Published on: July 16, 2016

Area of Science:

  • Endocrinology
  • Cell Biology
  • Immunology

Background:

  • Beta cell apoptosis is a hallmark of type 1 and type 2 diabetes.
  • Islet transplantation success is limited by beta cell loss.
  • Diverse triggers converge on conserved apoptotic pathways.

Purpose of the Study:

  • To review the molecular mechanisms of beta cell apoptosis.
  • To elucidate the intracellular pathways involved in beta cell death.

Main Methods:

  • Literature review of studies on beta cell apoptosis.
  • Analysis of molecular mediators and signaling pathways.

Main Results:

  • Immunological destruction in type 1 diabetes.
  • Metabolic dysregulation in type 2 diabetes.
  • Transplant-related stressors contribute to beta cell loss.

Conclusions:

  • Understanding beta cell apoptosis is crucial for diabetes and transplantation research.
  • Targeting conserved apoptotic pathways may offer therapeutic strategies.