Lipid accumulation promotes scission of caveolae

Caveolae, bulb-shaped invaginations of the plasma membrane (PM), show distinct behaviors of scission and fusion at the cell surface. Although it is known that caveolae are enriched in cholesterol and sphingolipids, exactly how lipid composition influences caveolae surface stability has not yet been elucidated. Accordingly, we inserted specific lipids into the PM of cells via membrane fusion and studied acute effects on caveolae dynamics. We demonstrate that cholesterol and glycosphingolipids specifically accumulate in caveolae, which decreases their neck diameter and drives their scission from the cell surface. The lipid-induced scission was counteracted by the ATPase EHD2. We propose that lipid accumulation in caveolae generates an intrinsically unstable domain prone to scission if not balanced by the restraining force of EHD2 at the neck. Our work advances the understanding of how lipids contribute to caveolae dynamics, providing a mechanistic link between caveolae and their ability to sense the PM lipid composition.