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Diabetes Mellitus: Overview and Type I Subtype

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...

Insulin: The Receptor and Signaling Pathways

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...

Type I Diabetes I: Introduction

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: Pathophysiology

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 II Diabetes I: Introduction

Type II Diabetes I: Introduction

Type 2 diabetes mellitus (T2DM) is a chronic metabolic disorder characterized by insulin resistance, in which target tissues such as the liver, muscle, and adipose tissue respond poorly to insulin. It is also associated with inadequate compensatory insulin secretion, where pancreatic β-cells fail to produce sufficient insulin. Together, these abnormalities lead to persistent hyperglycemia.EtiologyT2DM develops through a complex interaction of genetic predisposition and environmental or...

Type II Diabetes II: Pathophysiology

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.

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Related Experiment Video

Updated: Jul 16, 2026

Extraction of Tissue Antigens for Functional Assays

Extraction of Tissue Antigens for Functional Assays

Published on: September 10, 2012

A structural framework for deciphering the link between I-Ag7 and autoimmune diabetes.

A L Corper¹, T Stratmann, V Apostolopoulos

¹Department of Molecular Biology and Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.

Science (New York, N.Y.)

|April 25, 2000

Summary

The structure of I-Ag7, a key molecule in diabetes susceptibility, reveals a wider binding groove. This structural difference explains its distinct peptide preferences, impacting autoimmune disease development.

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Area of Science:

Immunogenetics
Structural Biology
Autoimmune Diseases

Background:

Insulin-dependent diabetes mellitus susceptibility is linked to specific major histocompatibility complex (MHC) class II alleles.
Alleles lacking aspartic acid at beta57, such as I-Ag7 in nonobese diabetic mice, are strongly correlated with disease development.

Purpose of the Study:

To determine the crystal structure of the I-Ag7 MHC class II molecule.
To understand the structural basis for I-Ag7's role in autoimmune diabetes susceptibility.

Main Methods:

X-ray crystallography was used to determine the structure of I-Ag7.
The structure was resolved at 2.6 angstrom resolution as a complex with a peptide from glutamic acid decarboxylase 65 (GAD65).

Main Results:

I-Ag7 possesses a significantly wider peptide-binding groove around the beta57 position compared to other MHC class II alleles.
This structural feature results in distinct peptide-binding preferences for I-Ag7.
The absence of Asp(beta57) creates an 'oxyanion hole' potentially interacting with peptide residues or T cell receptors.

Conclusions:

The unique structural characteristics of I-Ag7 explain its association with autoimmune diabetes.
Understanding I-Ag7's binding groove and peptide interactions offers insights into T cell recognition in type 1 diabetes.