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Related Concept Videos

Type I Diabetes I: Introduction01:12

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...
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Type I Diabetes II: Pathophysiology01:26

Type I Diabetes II: Pathophysiology

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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...
75
Type II Diabetes I: Introduction01:26

Type II Diabetes I: Introduction

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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...
17
Diabetes Mellitus: Overview and Type I Subtype01:22

Diabetes Mellitus: Overview and Type I Subtype

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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...
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Diabetes Mellitus: Introduction01:26

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

Type II Diabetes II: Pathophysiology

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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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Experiments by nature: lessons on type 1 diabetes.

M Battaglia1

  • 1San Raffaele Diabetes Research Institute, San Raffaele Scientific Institute, Milan, Italy.

Tissue Antigens
|December 21, 2013
PubMed
Summary

Type 1 diabetes (T1D) is commonly viewed as an autoimmune disease targeting insulin-producing beta cells. This review questions this dogma by examining natural experiments to understand T1D etiology and pathogenesis.

Keywords:
T cell-mediated responsesautoantibodiesautoimmunitydogmastype 1 diabetes

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Area of Science:

  • Immunology
  • Endocrinology
  • Pathology

Background:

  • Type 1 diabetes (T1D) is a prevalent, chronic disease impacting human health.
  • Conventional understanding defines T1D as a T cell-mediated autoimmune destruction of pancreatic beta cells.
  • Autoantibodies (autoAb) against beta cell antigens are markers for T1D risk and diagnosis but are not considered pathogenic.

Purpose of the Study:

  • To critically evaluate the established dogmas of T1D etiology and pathogenesis.
  • To investigate the role of autoantibodies in T1D development.
  • To utilize natural experiments to overcome human experimental biases in T1D research.

Main Methods:

  • Review of existing literature on T1D.
  • Analysis of natural experiments (e.g., spontaneous cases, genetic variations).
  • Comparison of findings with established T1D pathogenesis models.

Main Results:

  • Evidence suggests a re-evaluation of the autoimmune hypothesis in T1D is warranted.
  • The pathogenic role of autoantibodies in T1D requires further investigation.
  • Natural experiments provide unique insights into T1D mechanisms.

Conclusions:

  • The current understanding of T1D pathogenesis, particularly the autoimmune model, may be incomplete.
  • Further research into the precise mechanisms driving beta cell destruction in T1D is essential.
  • Natural experiments offer a valuable approach to understanding complex diseases like T1D.