Cholesterol Accumulation in Late Endosomes Affects Membrane Dynamics
Author Information
Author(s): Sobo Komla, Le Blanc Isabelle, Luyet Pierre-Philippe, Fivaz Marc, Ferguson Charles, Parton Robert G., Gruenberg Jean, van der Goot F. Gisou
Primary Institution: University of Geneva
Hypothesis
What are the effects of cholesterol accumulation in late endosomes on membrane organization and dynamics?
Conclusion
Cholesterol accumulation in late endosomes leads to increased compartment size and altered membrane dynamics, affecting the trafficking of proteins and lipids.
Supporting Evidence
- Cholesterol accumulation did not lead to an increase in the raft to non-raft membrane ratio as anticipated.
- Late endosomes from U18666A treated cells contained significantly more cholesterol than control cells.
- The volume of late endosomes increased by 2 to 3 fold in both U18666A treated cells and NPC1 deficient cells.
- U18666A treatment reduced late endosomal vacuolation induced by the mutant pore-forming toxin ASSP.
- U18666A treatment protected cells from anthrax toxin-induced cleavage of MEK1.
- Vesicular Stomatitis Virus infection was significantly reduced in U18666A treated cells.
Takeaway
When cholesterol builds up in certain cell compartments, it makes them bigger and changes how they work, which can cause problems in how cells handle important materials.
Methodology
The study used morphological, chemical, and functional approaches to analyze cholesterol accumulation in late endosomes of BHK cells treated with U18666A.
Limitations
The study primarily focused on a specific cell line and may not fully represent the effects in other cell types or in vivo conditions.
Statistical Information
P-Value
p<0.05
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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