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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.
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Diabetes Mellitus: Introduction

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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...

Type I Diabetes I: Introduction

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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...

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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

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Related Experiment Video

Updated: Jul 9, 2026

Accelerated Type 1 Diabetes Induction in Mice by Adoptive Transfer of Diabetogenic CD4+ T Cells

Accelerated Type 1 Diabetes Induction in Mice by Adoptive Transfer of Diabetogenic CD4+ T Cells

Published on: May 6, 2013

DNA immunization to prevent autoimmune diabetes.

B Coon¹, L L An, J L Whitton

¹Division of Virology, Department of Neuropharmacology, The Scripps Research Institute, La Jolla, California 92037, USA.

The Journal of Clinical Investigation

|July 20, 1999

Summary

DNA vaccination using insulin B-chain plasmid DNA prevents autoimmune diabetes in a mouse model by inducing regulatory T cells. This approach shows promise for preventing autoimmune diseases by targeting specific self-antigens.

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Area of Science:

Immunology
Endocrinology
Virology

Background:

Mice with a lymphocytic choriomeningitis virus nucleoprotein (LCMV-NP) transgene in beta cells develop autoimmune diabetes upon LCMV infection.
This model mimics human autoimmune diabetes, offering a platform to study prevention strategies.

Purpose of the Study:

To investigate the efficacy of DNA vaccination with insulin B-chain plasmid DNA in preventing LCMV-induced autoimmune diabetes.
To elucidate the immunological mechanisms underlying the protective effects of insulin B-chain DNA vaccination.

Main Methods:

Mice expressing LCMV-NP transgene were inoculated with plasmid DNA encoding the insulin B chain or LCMV viral protein.
Assessment of diabetes incidence and analysis of regulatory T cell induction and function in pancreatic draining lymph nodes.

Main Results:

Insulin B-chain DNA vaccination reduced the incidence of insulin-dependent diabetes mellitus (IDDM) by 50%.
This protection was mediated by the induction of regulatory CD4+ T lymphocytes specific for the insulin B chain.
These regulatory T cells secreted IL-4 and suppressed LCMV-NP-autoreactive cytotoxic T lymphocytes.
Vaccination with LCMV viral protein did not prevent IDDM, as it failed to induce regulatory cells.

Conclusions:

DNA immunization with carefully selected self-antigens, like the insulin B chain, can prevent autoimmune diabetes.
The induction of antigen-specific regulatory T cells is a key mechanism for preventing autoimmune diseases.
This strategy holds potential as a novel therapeutic approach for autoimmune diseases.