Palmitoylated caveolin-1 enables endosome sorting of complex sphingolipids.
Schmieder. S S SS; Podkalicka. J J; Viaris de Lesegno. C C; Han. B B; Schulz. L L; Tatituri. R R; Narendran. M M; Strieker. L L; Manzi. J J; Kenworthy. A K AK; Bassereau. P P; Lamaze. C C; Lencer. W I WI
Key Findings
- Caveolin‑1 is required for proper delivery of complex sphingolipids to the plasma membrane.
- Palmitoylation (attachment of a palmitic acid) of caveolin‑1 is essential for this function.
- Removing caveolin‑1 or its palmitoylation sites redirects sphingolipids to lysosomes, but adding back normal caveolin‑1 rescues the trafficking.
Practical Outcomes
- For most biohackers, the findings are mostly academic and don’t translate into a direct supplement or protocol. It does highlight that protein palmitoylation can influence membrane lipid composition, but there’s no actionable guidance on using palmitoyl‑dipeptide‑6 or related compounds for health benefits.
Summary
The study shows that a protein called caveolin‑1, when it has a fatty‑acid tag (palmitoylation), helps move complex fats (sphingolipids) from inside the cell to the cell surface. Without this tag, the fats get sent to the cell’s waste compartment instead of the membrane.
Abstract
Complex sphingolipids form in the Golgi apparatus and require transport by vesicular carriers to reach the plasma membrane (PM) where they assemble with cholesterol to affect membrane function. The caveolin proteins have been implicated in sphingolipid trafficking but by mechanisms unknown. Here, we found that cells lacking caveolin-1 (Cav1) distributed the complex sphingolipids to the lysosome rather than to the PM. This was not seen in Cavin-1 KO cells, implicating a function for Cav1 independent of caveolae. The defect in trafficking localized to the sorting endosome where the complex sphingolipids failed to enter recycling tubules serving the PM. Sphingolipid trafficking was rescued by over-expression of Cav1, but not by a Cav1 mutant that lacked the S-palmitoylation sites. Thus, noncaveolar and palmitoylated Cav1 appears to act as a chaperone, or selectivity filter, enabling entry of the complex sphingolipids into endocytic recycling tubules to shape the composition of the PM.
Study Information
pubmed
2025
2025-10-01T00:00:00.000Z
10.1101/2025.10.01.679304