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Related Concept Videos

Cholesterol: Significance and Regulation01:29

Cholesterol: Significance and Regulation

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...
Quantitative Aspects of Drug-Receptor Interaction01:30

Quantitative Aspects of Drug-Receptor Interaction

The receptor occupancy theory connects a drug's response to the number of occupied receptors. With higher drug concentrations, more receptors are occupied, leading to increased responses. The formation of drug-receptor complexes involves association and dissociation rates, which reach equilibrium when the forward and backward reactions are equal. The equilibrium association constant (Ka) and its inverse, the equilibrium dissociation constant (Kd), indicate drug affinity. Higher Ka and lower Kd...
Overview of Fatty Acid Metabolism01:28

Overview of Fatty Acid Metabolism

Lipids also are sources of energy that power cellular processes. Like carbohydrates, lipids are composed of carbon, hydrogen, and oxygen, but these atoms are arranged differently. Most lipids are nonpolar and hydrophobic. Major types include fats and oils, waxes, phospholipids, and steroids.
Fatty acids are catabolized in a process called beta-oxidation, which takes place in the matrix of the mitochondria and converts their fatty acid chains into two-carbon units of acetyl groups. The acetyl...
Lipid-Lowering Drugs: Statins and Miscellaneous Agents01:20

Lipid-Lowering Drugs: Statins and Miscellaneous Agents

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...
Factors Affecting Dissolution: Drug Permeability, Stability and Stereochemistry01:20

Factors Affecting Dissolution: Drug Permeability, Stability and Stereochemistry

Orally administered drugs primarily enter the systemic circulation via passive diffusion through the intestinal membranes. The drug's absorption is influenced by drug stability in the gastrointestinal GI tract, membrane permeability, the surface area available for absorption, luminal drug concentration, and residence time in the lumen. Drug permeability can be enhanced by adjusting the lipophilicity, polarity, or molecular size of the drug, promoting its passive transport across intestinal...
Membrane Fluidity01:26

Membrane Fluidity

Membrane fluidity is explained by the fluid mosaic model of the cell membrane, which describes the plasma membrane structure as a mosaic of components—including phospholipids, cholesterol, proteins, and carbohydrates—that gives the membrane a fluid character.
Mosaic nature of the membrane
The mosaic characteristic of the membrane helps the plasma membrane remain fluid. The integral proteins and lipids exist as separate but loosely-attached molecules in the membrane. The membrane is a relatively...

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Related Experiment Video

Updated: May 9, 2026

Cholesterol Efflux Assay
07:54

Cholesterol Efflux Assay

Published on: March 6, 2012

Surface occupancy plays a major role in cholesterol's condensing effect.

Martin R Krause1, Serhan Turkyilmaz, Steven L Regen

  • 1Department of Chemistry, Lehigh University, Bethlehem, Pennsylvania 18015, USA.

Langmuir : the ACS Journal of Surfaces and Colloids
|August 2, 2013
PubMed
Summary

Cholesterol

Area of Science:

  • Biochemistry
  • Membrane Biophysics
  • Molecular Biology

Background:

  • Cholesterol is a vital component of animal cell membranes.
  • Its role in membrane fluidity and condensation is well-established.
  • Understanding cholesterol's interactions is key to membrane function.

Purpose of the Study:

  • To compare the membrane condensing effects of cholesterol and 5α-cholestane.
  • To investigate the structural requirements for cholesterol's condensing activity.
  • To elucidate the role of the steroid nucleus's position in lipid bilayers.

Main Methods:

  • Utilized liposomal membranes composed of 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC).
  • Employed quantitative nearest-neighbor recognition (NNR) analysis.

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Related Experiment Videos

Last Updated: May 9, 2026

Cholesterol Efflux Assay
07:54

Cholesterol Efflux Assay

Published on: March 6, 2012

Enrichment of Mammalian Tissues and Xenopus Oocytes with Cholesterol
10:12

Enrichment of Mammalian Tissues and Xenopus Oocytes with Cholesterol

Published on: March 25, 2020

Macrophage Cholesterol Depletion and Its Effect on the Phagocytosis of Cryptococcus neoformans
11:07

Macrophage Cholesterol Depletion and Its Effect on the Phagocytosis of Cryptococcus neoformans

Published on: December 19, 2014

  • Conducted fluorescence measurements using the phase-sensitive probe Laurdan.

    • Main Results:

    • 5α-cholestane demonstrated a significantly weaker condensing effect compared to cholesterol.
    • Cholesterol's condensing power is dependent on its steroid nucleus being at the membrane surface.
    • The structural orientation of the steroid nucleus is crucial for its effect on membrane condensation.

    Conclusions:

    • Cholesterol's ability to condense membranes is intrinsically linked to its specific molecular structure and orientation.
    • The findings highlight the importance of the steroid nucleus's surface localization for cholesterol's membrane-modulating functions.
    • This research provides critical insights into the molecular mechanisms of sterol-lipid interactions in biological membranes.