Related Experiment Video
Updated: Apr 15, 2026
07:26
Single-molecule Super-resolution Imaging of Phosphatidylinositol 4,5-bisphosphate in the Plasma Membrane with Novel Fluorescent Probes
Published on: October 15, 2016
10.1K
Perilipin 5 mediated lipid droplet remodelling revealed by coherent Raman imaging
Nils Billecke1, Madeleen Bosma, William Rock
1Department of Molecular Spectroscopy, Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany. parekh@mpip-mainz.mpg.de.
Summary
Perilipin 5 (PLIN5) protein in muscle cells influences fat droplet composition, leading to larger droplets with more saturated fats. This suggests PLIN5 plays a role in protecting against fat buildup linked to insulin resistance.
Area of Science:
- Biochemistry
- Cell Biology
- Metabolic Disease Research
Background:
- Intramyocellular lipids (IMCLs) accumulation in muscle is linked to insulin resistance and type 2 diabetes.
- Lipid droplets (LDs) are cellular fat depots regulated by coat proteins like Perilipin 5 (PLIN5).
- PLIN5 is crucial for lipid storage in muscle tissue.
Purpose of the Study:
- To investigate the impact of PLIN5 overexpression on the composition and physiology of individual lipid droplets (LDs) in muscle cells.
- To quantify changes in LDs using advanced chemical imaging techniques.
Main Methods:
- Utilized a tandem in vitro/ex vivo experimental approach.
- Employed label-free, hyperspectral coherent Raman microscopy for chemical imaging.
- Quantified compositional alterations in individual LDs following PLIN5 overexpression.
Main Results:
- PLIN5 overexpression altered individual LD composition and physiology in muscle cells.
- Overexpression resulted in larger LDs with increased esterified acyl chain concentration.
- Observed increased methylene content and a higher proportion of saturated lipid species within LDs.
Conclusions:
- PLIN5 overexpression modifies LDs, increasing their saturation and size.
- These molecular changes in LDs likely contribute to the lipotoxic protection observed with natural PLIN5 upregulation in muscle.
- Findings provide insight into the mechanisms underlying muscle lipid metabolism and insulin sensitivity.
