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Related Concept Videos

Membrane Fluidity01:23

Membrane Fluidity

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Cell membranes are composed of phospholipids, proteins, and carbohydrates loosely attached to one another through chemical interactions. Molecules are generally able to move about in the plane of the membrane, giving the membrane its flexible nature called fluidity. Two other features of the membrane contribute to membrane fluidity: the chemical structure of the phospholipids and the presence of cholesterol in the membrane.
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Membrane Fluidity01:26

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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...
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The living membranes are flexible due to their fluid mosaic nature; however, their bending into different shapes is an active process regulated by specific lipids and proteins. The membrane bending can be transient as seen in vesicles or stable for a long time as in microvilli. Cells regulate the size, location, and duration of the membrane curvature.
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Mechanisms of Membrane Domain Formation00:59

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Different physical properties of lipids and proteins allow them to localize and form distinct islands or domains in the membrane. Some membrane domains are formed due to protein-protein interactions, whereas others are formed due to the presence of specific lipids such as sphingolipids and sterols—for example, large proteins, such as bacteriorhodopsin, aggregate and create distinct domains.
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Scientists identified the plasma membrane in the 1890s and its principal chemical components (lipids and proteins) by 1915. The model for plasma membrane structure, proposed in 1935 by Hugh Davson and James Danielli, was the first model to be widely accepted in the scientific community. The model was based on the plasma membrane's "railroad track" appearance in early electron micrographs. Davson and Danielli theorized that the plasma membrane's structure resembled a sandwich...
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Membrane Domains01:18

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The membrane domains concentrate specific lipids and proteins at one place within the membrane, which helps in cell signaling, adhesion, and other critical cellular processes. These domains can differ in size, composition, function, and lifespan.
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Fat inclusions strongly alter membrane mechanics.

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Neutral lipids (NLs) alter cell membrane mechanics by decreasing area expansion and increasing lysis tension. This lipid droplet formation impacts membrane properties, potentially linking to diseases and cancer therapies.

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Area of Science:

  • Biophysics
  • Cell Biology
  • Lipid Metabolism

Background:

  • Neutral lipids (NLs) are synthesized in the endoplasmic reticulum and form lipid droplets (LDs).
  • NLs can accumulate within lipid bilayers, potentially influencing membrane properties.
  • Understanding how NLs affect membrane mechanics is crucial for cellular processes and disease.

Purpose of the Study:

  • To investigate the impact of neutral lipid accumulation on the mechanical properties of lipid bilayers.
  • To explore how contiguous lipid droplets supply NLs to the bilayer and alter its mechanics.
  • To elucidate the relationship between NLs, membrane mechanics, and potential pathological or therapeutic implications.

Main Methods:

  • Utilized synthetic lipid bilayer systems to study mechanical property alterations.
  • Quantified changes in bilayer stretching capacities, area expansion modulus, lysis tension, and bending rigidity.
  • Investigated the effects of NLs, particularly when a lipid droplet is adjacent to the bilayer.

Main Results:

  • Neutral lipids confer unusual stretching capacities to lipid bilayers, enhanced by negatively curved phospholipids.
  • A contiguous lipid droplet supplying NLs to the bilayer significantly impacts its mechanical properties.
  • NLs decrease the bilayer area expansion modulus and increase lysis tension.
  • NLs have opposing effects on membrane bending rigidity compared to area expansion and lysis tension.

Conclusions:

  • Neutral lipid accumulation significantly modifies the mechanical properties of lipid bilayers.
  • These alterations in membrane mechanics, driven by NLs and LDs, may play roles in various pathologies.
  • The findings offer insights into potential therapeutic strategies targeting NLs in diseases and cancer treatments.