New imaging technology reveals VPS13A protein's role in lipid transport between cellular organelles
Researchers developed a metabolic labeling technique to image phosphatidylethanolamine (PE) lipids in living cells, allowing them to track lipid movement in real time. The technology uses azido-labeled ethanolamine derivatives combined with click chemistry to visualize PE without interference from cellular methylation processes. The discovery that VPS13A transports PE from the endoplasmic reticulum to mitochondria could advance understanding of lipid dynamics and disease mechanisms.
Scientists created a novel imaging platform for visualizing phosphatidylethanolamine lipids within live mammalian cells by screening ethanolamine derivatives to identify an azido compound that efficiently labels PE while avoiding the cell's methylation machinery. The approach uses strain-promoted click chemistry with cyclooctyne dyes to render the labeled lipids fluorescent, enabling direct visualization across cellular organelles. Using this technology, the team demonstrated PE externalization during apoptosis and identified VPS13A as a phosphatidylethanolamine transfer protein that shuttles lipids from the endoplasmic reticulum to mitochondria. The researchers suggest this imaging method will enable investigation of fundamental PE biology questions and help clarify how dysregulation of PE trafficking contributes to disease states.
Limitations & open questions
The study's own limitations are not detailed in the abstract provided, such as whether the imaging technique has been validated in disease models, the specificity and sensitivity metrics of the probe, potential off-target effects, or the scope of organisms/cell types tested beyond the mention of mammalian cells.
What different sources said
- bioRxivCenter
A metabolic labelling-based lipid imaging technology establishes VPS13A as a phosphatidylethanolamine lipid transfer protein
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