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LDL Cholesterol Uptake Assay Using Live Cell Imaging Analysis with Cell Health Monitoring
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Active cholesterol 20 years on.

Yvonne Lange1, Theodore L Steck2

  • 1Department of Pathology, Rush University Medical Center, Chicago, Illinois, USA.

Traffic (Copenhagen, Denmark)
|September 15, 2020
PubMed
Summary
This summary is machine-generated.

Cholesterol in cell membranes forms complexes with phospholipids, influencing bilayer properties. Excess cholesterol acts dynamically, regulating membrane homeostasis and cellular transport.

Keywords:
accessibleactiveavailablecaveolaecholesterolcytolysinshedgehoghomeostasisreviewthreshold

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Area of Science:

  • Membrane Biophysics
  • Cell Biology
  • Biochemistry

Background:

  • Sterols, particularly cholesterol, are integral components of plasma membranes.
  • Cholesterol's association with phospholipids influences membrane fluidity and material properties.
  • The functional roles of cholesterol beyond structural support are actively investigated.

Purpose of the Study:

  • To review hypotheses regarding the functions of thermodynamically active cholesterol in cell membranes.
  • To explore cholesterol's role in membrane homeostasis, transport, and protein modulation.
  • To discuss cholesterol's involvement in specific cellular processes like caveolae function and toxin binding.

Main Methods:

  • This study is a review of existing literature and hypotheses.
  • It synthesizes findings from biophysical, biochemical, and cell biology research.
  • Theoretical and experimental evidence supporting various cholesterol functions are considered.

Main Results:

  • Most plasma membrane sterols associate with phospholipids, affecting bilayer characteristics.
  • A small, 'active' fraction of cholesterol, exceeding phospholipid binding capacity, is functionally dynamic.
  • This active cholesterol participates in membrane transport, homeostasis signaling, and interactions with proteins and toxins.

Conclusions:

  • Active cholesterol plays diverse roles beyond structural lipid packing.
  • It acts as a signaling molecule for plasma membrane homeostasis and inter-organelle communication.
  • Cholesterol's dynamic functions are critical for cellular processes, including transport, signaling, and pathogen interactions.