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Related Concept Videos

Cholesterol: Significance and Regulation01:29

Cholesterol: Significance and Regulation

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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.
Considering cholesterol and...
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Lipids: Dietary Sources and Requirements01:18

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Lipids are an essential component of a balanced human diet. Triglycerides, which make up the majority of dietary lipids, are found in both saturated fats—commonly present in meat, dairy products, and certain tropical plants like coconut, and hydrogenated oils such as margarine and baking shortenings (trans fats)—and unsaturated fats, which are abundant in seeds, nuts, olive oil, and most vegetable oils. The main sources of cholesterol include egg yolks, various meats and organ...
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Blood Studies for Cardiovascular System III: Serum Lipid Profile01:25

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Understanding serum lipids is crucial for maintaining cardiovascular health and preventing heart disease and stroke.
Serum lipids are fats and fatty substances in the blood and are crucial for various bodily functions, including energy storage, cellular structure, and hormone production. Serum lipids consist of cholesterol, triglycerides, and phospholipids.
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Atherosclerosis I: Introduction01:30

Atherosclerosis I: Introduction

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Atherosclerosis is a progressive disorder characterized by the buildup of plaques on the arterial inner wall, causing them to narrow and harden over time. These plaques comprise lipids, calcium, blood components, carbohydrates, and fibrous tissue. The process primarily affects the intima of large and medium-sized arteries, reducing blood flow in any artery.Etiology and risk factorsThe cause of atherosclerosis is multifactorial, involving a complex interplay among endothelial injury, lipid...
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Atherosclerosis III: Management01:26

Atherosclerosis III: Management

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Management of atherosclerosis involves an integrated strategy encompassing pharmacological treatment, surgical interventions, lifestyle changes, and nutrition therapy to address the multifactorial nature of the disease.Pharmacological TherapyA cornerstone of atherosclerosis management is the use of pharmacological agents. Statins, such as atorvastatin, are pivotal in inhibiting HMG-CoA reductase, an enzyme that catalyzes an initial step in cholesterol synthesis in the liver. This reduction in...
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Lipid-Lowering Drugs: Statins and Miscellaneous Agents01:20

Lipid-Lowering Drugs: Statins and Miscellaneous Agents

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Hyperlipidemia, a medical condition often referred to as high cholesterol, is characterized by abnormally elevated levels of lipids in the bloodstream. When present in excess, these lipids, specifically cholesterol and triglycerides, can lead to serious health complications, often involving cardiovascular diseases. Illnesses like atherosclerosis, heart attacks, and pancreatitis have all been linked to untreated hyperlipidemia. This means controlling and regulating cholesterol and triglyceride...
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Related Experiment Video

Updated: Sep 29, 2025

Cell-free Biochemical Fluorometric Enzymatic Assay for High-throughput Measurement of Lipid Peroxidation in High Density Lipoprotein
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Cell-free Biochemical Fluorometric Enzymatic Assay for High-throughput Measurement of Lipid Peroxidation in High Density Lipoprotein

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Free Cholesterol Bioavailability and Atherosclerosis.

Rei J Abe1,2, Jun-Ichi Abe3, Minh T H Nguyen1,4

  • 1Center for Cardiovascular Sciences, Houston Methodist Research Institute, Houston, TX, USA.

Current Atherosclerosis Reports
|March 25, 2022
PubMed
Summary
This summary is machine-generated.

High-density lipoprotein (HDL) cholesterol concentration may not reflect its protective function against atherosclerosis. Free cholesterol (FC) bioavailability, not HDL-c levels, is key to understanding cardiovascular disease risk.

Keywords:
Cardiovascular diseaseFree cholesterolHigh-density lipoproteinReverse cholesterol transportScavenger receptor class B type 1

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Area of Science:

  • Cardiovascular Science
  • Lipid Metabolism
  • Atherosclerosis Research

Background:

  • High-density lipoprotein (HDL) is traditionally considered atheroprotective due to its role in reverse cholesterol transport (RCT).
  • Pharmacological strategies increasing HDL cholesterol (HDL-c) have paradoxically failed to prevent cardiovascular disease (CVD).
  • Excess free cholesterol (FC) transfer to peripheral cells contributes to atherosclerosis.

Purpose of the Study:

  • To explore mechanisms behind the HDL-c paradox in atherosclerosis.
  • To highlight the role of free cholesterol (FC) bioavailability in atherosclerosis versus atheroprotection.

Main Methods:

  • Review of recent findings on HDL-c concentration and atherosclerosis.
  • Analysis of scavenger receptor class B type 1 (SR-B1) knockout mouse models.

Main Results:

  • SR-B1 knockout mice show increased atherosclerosis despite higher HDL-c.
  • Elevated HDL-FC bioavailability in SR-B1 mice correlates with higher FC in tissues.
  • Dysfunctional HDL with high FC bioavailability appears atheroprone.

Conclusions:

  • HDL-c quantity is less important than FC-mediated functionality for atheroprotection.
  • Understanding HDL-FC bioavailability regulation is crucial for clinical implications in atherosclerosis.
  • Rethinking HDL's role beyond simple cholesterol transport is necessary for effective therapies.