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Updated: Jan 9, 2026
10:23
Lipid Droplet Isolation for Quantitative Mass Spectrometry Analysis
Published on: April 17, 2017
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Acyl-chain saturation drives lipid sorting to model lipid droplets.
Sami Kchir1, Murphy McDermott1, Valeria Zoni2
1Laboratoire de Physique de l'École Normale Supérieure (ENS), Université PSL, CNRS, Sorbonne Université, Université de Paris, Paris, France.
Biophysical Journal
|December 11, 2025
Summary
Lipid saturation and neutral lipid chemistry dictate how phospholipids distribute between membranes and artificial lipid droplets (aLDs). Saturated phospholipids generally avoid aLDs, especially when neutral lipids like cholesteryl oleate are present.
Area of Science:
- Biochemistry
- Cell Biology
- Membrane Biophysics
Background:
- Lipid droplets (LDs) originate from the endoplasmic reticulum (ER), involving lipid transfer between the ER bilayer and the forming LD monolayer.
- The precise chemical drivers governing lipid partitioning between these compartments are not fully understood.
Purpose of the Study:
- To investigate the partitioning behavior of saturated and monounsaturated phospholipids between a bilayer and an artificial LD (aLD) monolayer.
- To determine how neutral lipid composition influences this partitioning process.
Main Methods:
- Utilized model systems to study lipid distribution.
- Employed molecular dynamics simulations to support experimental observations.
Main Results:
- Lipid saturation influences phospholipid partitioning into aLDs, with saturated phospholipids generally being disfavored compared to monounsaturated ones.
- The presence of cholesteryl oleate in triolein-based aLDs significantly reduces overall phospholipid content, particularly saturated phospholipids.
- Triolein-based aLDs preferentially localize to liquid-disordered membrane regions, which act as key sites for neutral lipid exchange.
Conclusions:
- Lipid saturation and neutral lipid chemistry interact to control lipid composition and distribution in bilayers and aLDs.
- Findings suggest that liquid-disordered membrane regions facilitate neutral lipid accumulation and exchange.
- Raises questions about cellular mechanisms regulating spontaneous lipid sorting in the ER and LDs.
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