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Related Concept Videos

Obesity01:24

Obesity

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The Body Mass Index (BMI) is a numerical value derived from a person's weight and height, used to categorize individuals into weight ranges. It is calculated using the formula: weight in kilograms divided by height in meters squared. Obesity is a health condition characterized by excessive accumulation of adipose tissue that poses health risks, often diagnosed with a BMI ≥ 30. This excess fat storage occurs when surplus dietary calories are converted into triglycerides and stored in...
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Smooth Muscle Contraction01:25

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Smooth muscle contraction is a complex process vital for various bodily functions, from maintaining blood vessel tension to facilitating the movement of food through the digestive tract. Unlike striated muscles, smooth muscle contraction begins more slowly and lasts longer.
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Hypertension II: Pathophysiology01:29

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Hypertension is a chronic condition in which the blood's force against artery walls is excessively high, posing risks such as heart disease. The condition's underlying mechanisms involve complex interactions among the cardiovascular, kidney, and autonomic nervous systems.Renin-Angiotensin-Aldosterone System (RAAS): This system significantly influences blood pressure regulation. When blood pressure decreases, the kidneys secrete renin. This enzyme transforms angiotensinogen, a plasma protein,...
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Adrenergic Receptors: β Subtype01:26

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β-adrenoceptors have varied sensitivities towards adrenaline, noradrenaline, and isoprenaline. The order of agonist potency is as follows:
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Disorders of the Autonomic Nervous System01:18

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The autonomic nervous system (ANS) is an intricate network of nerves that controls functions such as the regulation of heart rate, digestion, and blood pressure regulation. When this system malfunctions, it can lead to various disorders that affect multiple bodily functions. One common feature of many autonomic disorders is the involvement of smooth blood vessels, which play a crucial role in regulating blood flow throughout the body.
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Although not a source of energy, cholesterol plays a significant role as a foundational structure for bile salts, steroid hormones, and vitamin D, as well as being a crucial component of plasma membranes. Approximately 15% of blood cholesterol is derived from our diet, with the remainder synthesized from acetyl CoA by the liver and intestines. Cholesterol is eliminated from the body through its conversion into bile salts, which are eventually discarded in the feces.
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Related Experiment Video

Updated: Jan 17, 2026

Assessment of Vascular Tone Responsiveness using Isolated Mesenteric Arteries with a Focus on Modulation by Perivascular Adipose Tissues
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Obesity-Associated Adiposomes Promote Vascular Smooth Muscle Cell Hypercontractility.

Elsayed Metwally1,2, Imaduddin Mirza1, Mohammed H Morsy1

  • 1Department of Medicine, Division of Endocrinology, Diabetes, and Metabolism, College of Medicine, University of Illinois Chicago, Chicago, Illinois, USA.

Comprehensive Physiology
|September 19, 2025
PubMed
Summary

Obesity-derived adiposomes (extracellular vesicles) disrupt vascular smooth muscle cell function, increasing arterial stiffness. Ceramides mediate this effect, offering a target for treating obesity-related vascular issues.

Keywords:
Ca2+ signalingKATP channelsadiposomesceramidehypercontractilitymetabolic syndromeobesityreactive oxygen speciesvascular dysfunctionvascular smooth muscle cells

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Assessment of Human Adipose Tissue Microvascular Function Using Videomicroscopy
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Related Experiment Videos

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Area of Science:

  • Cardiovascular Biology
  • Metabolic Disease Research
  • Cellular Physiology

Background:

  • Inter-organ crosstalk between adipose tissue and vasculature is crucial in obesity-related cardiovascular dysfunction.
  • Obese adiposomes impair vasodilation via endothelial dysfunction; their effect on vascular smooth muscle cells (VSMCs) is unknown.

Purpose of the Study:

  • To investigate the impact of adiposomes from obese donors on vascular smooth muscle cell function.
  • To identify mechanisms underlying obesity-induced vascular dysfunction mediated by adiposomes.

Main Methods:

  • Adiposomes were isolated from visceral adipose tissue of obese and lean human subjects and diet-induced obese (DIO) mice.
  • Vascular myogenic tone, VSMC intracellular Ca2+, membrane potential, and reactive oxygen species (ROS) were analyzed.

Main Results:

  • Obese adiposomes increased arteriolar myogenic tone and VSMC Ca2+ excitability.
  • Obese adiposomes impaired KATP channel function and elevated ROS in VSMCs.
  • Ceramides in obese adiposomes were identified as key mediators of vascular hypercontractility.

Conclusions:

  • Adiposomes from obese individuals promote VSMC dysfunction, contributing to obesity-related vascular complications.
  • Targeting adiposome-mediated inter-organ communication presents a potential therapeutic strategy for vascular issues in obesity.