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Related Concept Videos

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.
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...

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Complement Factor C1q Mediates Vascular Endothelial Dysfunction in STZ-Induced Diabetic Mice.

Aiqin Mao1,2, Zicheng Li2, Xiaoming Shi1

  • 1Wuxi School of Medicine, Jiangnan University, Wuxi, China.

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Summary

Diabetic complications involve endothelial cell dysfunction. This study reveals that increased complement C1qa in diabetic mouse aortas drives this dysfunction, but inhibiting C1qa improves vascular health.

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Area of Science:

  • Vascular Biology
  • Immunology
  • Metabolic Diseases

Background:

  • Diabetes mellitus is a major health concern linked to vascular endothelial cell (EC) dysfunction.
  • EC dysfunction contributes to the progression of diabetic complications.

Purpose of the Study:

  • To compare aortic cellular and molecular characteristics in normal versus streptozotocin-induced diabetic mice.
  • To identify mechanisms underlying endothelial cell dysfunction in diabetes.

Main Methods:

  • Single-cell RNA sequencing of 32,573 aortic cells from normal and diabetic mice.
  • Analysis of 10 distinct cell types, focusing on endothelial cells.
  • In vivo inhibition of complement C1qa using AAV-Tie2-shRNA-C1qa in diabetic mice.

Main Results:

  • A subpopulation of aortic ECs in diabetic mice showed significantly elevated expression of complement C1qa.
  • Increased C1qa induced reactive oxygen species (ROS), enhanced EC migration, increased permeability, and impaired vasodilation.
  • Inhibiting C1qa in diabetic mice reduced ROS, decreased vascular permeability, and improved vasodilation.

Conclusions:

  • Complement C1qa plays a critical role in diabetes-associated endothelial dysfunction.
  • Targeting C1qa may offer a therapeutic strategy for diabetic vascular complications.