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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...
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Endothelial dysfunction, obesity and insulin resistance.

Dolores Prieto, Cristina Contreras, Ana Sánchez1

  • 1Department of Physiology, Faculty of Pharmacy, Universidad Complutense, 28040-Madrid, Spain. dprieto@farm.ucm.es.

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Obesity causes endothelial dysfunction via oxidative stress and inflammation, impairing blood vessel function and contributing to metabolic complications. Lifestyle changes can improve these vascular issues.

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Area of Science:

  • Cardiovascular Science
  • Metabolic Science
  • Endocrinology

Background:

  • Obesity is a global metabolic disorder linked to insulin resistance (IR), metabolic syndrome, and type 2 diabetes.
  • Endothelial dysfunction in obesity arises from indirect factors like IR and direct effects of adipose tissue-derived inflammatory adipokines and free fatty acids (FFAs).
  • Studies show impaired vasodilation in obesity, correlating with visceral fat and improving with diet and exercise.

Purpose of the Study:

  • To review pathogenic mechanisms of endothelial dysfunction in obesity.
  • To highlight the role of oxidative stress, inflammation, and perivascular adipose tissue (PVAT).
  • To discuss the impact on cardiovascular and metabolic complications.

Main Methods:

  • Review of clinical and experimental studies, including animal models of obesity.
  • Analysis of mechanisms involving nitric oxide (NO) bioavailability, oxidative stress, and reactive oxygen species (ROS).
  • Examination of the role of adipokines, endothelin-1 (ET-1), and perivascular adipose tissue (PVAT).

Main Results:

  • Oxidative stress and compromised nitric oxide (NO) bioavailability are key causes of endothelial dysfunction in obesity.
  • Inflamed adipose tissue, particularly PVAT, releases ROS and adipokines that disrupt NO signaling.
  • Obesity-associated endothelial dysfunction exacerbates insulin resistance and impairs tissue substrate delivery.

Conclusions:

  • Endothelial dysfunction in obesity is driven by oxidative stress and inflammation, particularly from PVAT.
  • This dysfunction contributes significantly to cardiovascular and metabolic complications associated with obesity.
  • Understanding these mechanisms is crucial for developing targeted interventions for obesity-related diseases.