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Related Concept Videos

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 I Diabetes III: Clinical Manifestations01:19

Type I Diabetes III: Clinical Manifestations

Type 1 diabetes mellitus typically presents with rapid-onset symptoms due to the body’s inability to utilize glucose in the absence of insulin. Since insulin is required for glucose uptake into cells, its deficiency leads to hyperglycemia and cellular energy deprivation, resulting in characteristic clinical features.Polyuria and PolydipsiaOne of the earliest, most prominent symptoms is polyuria (excessive urination). When blood glucose concentrations rise above the renal threshold, the kidneys...
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...

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Related Experiment Video

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Accelerated Type 1 Diabetes Induction in Mice by Adoptive Transfer of Diabetogenic CD4+ T Cells
06:27

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Published on: May 6, 2013

Increased complement activation in human type 1 diabetes pancreata.

Patrick Rowe1, Clive Wasserfall, Byron Croker

  • 1Corresponding author: Desmond Schatz, schatz@ufl.edu.

Diabetes Care
|September 18, 2013
PubMed
Summary

Complement activation occurs in the pancreas of individuals with type 1 diabetes (T1D). Complement C4d staining may serve as a biomarker for T1D diagnosis.

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Area of Science:

  • Immunology
  • Endocrinology
  • Pathology

Background:

  • Evidence links complement (C) system activation to type 1 diabetes (T1D).
  • C-fixing islet cell autoantibodies and genetic associations with MHC III C4 region support this link.
  • The presence of C activation within the pancreas in T1D is not well understood.

Purpose of the Study:

  • To investigate the presence of complement activation in pancreatic tissue from individuals with T1D.
  • To determine if complement activation is also present in individuals at increased risk for T1D.
  • To explore C4d as a potential biomarker for T1D.

Main Methods:

  • Immunohistochemical analysis of pancreatic tissue from organ donors.
  • Quantification of the complement degradation product C4d.
  • Comparison of C4d levels across groups: T1D, type 2 diabetes, autoantibody-positive, and autoantibody-negative subjects.

Main Results:

  • Complement C4d antigen density varied significantly across study groups (P < 0.0001).
  • Highest C4d levels were observed in pancreata from patients with T1D.
  • C4d immunostaining was localized to vascular endothelium and extracellular matrix.

Conclusions:

  • Complement activation is demonstrably occurring within the pancreas in type 1 diabetes.
  • C4d staining shows high sensitivity (81.8%) and specificity (94.4%) for T1D.
  • C4d may represent a novel diagnostic biomarker for type 1 diabetes.