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Cyclodextrin triggers MCOLN1-dependent endo-lysosome secretion in Niemann-Pick type C cells.
Journal of Lipid Research 2019 Februrary 2
In specialized cell types, lysosome-related organelles support regulated secretory pathways, while in non-specialized cells, lysosomes can undergo fusion with the plasma membrane in response to a transient rise in cytosolic calcium. Recent evidence also indicates that lysosome secretion can be controlled transcriptionally and promote clearance in lysosome storage diseases. In addition, evidence is also accumulating that low concentrations of cyclodextrins reduce the cholesterol storage phenotype in cells and animals with the cholesterol storage disease Niemann-Pick type C, via an unknown mechanism. Here, we report that cyclodextrin triggers the secretion of the endo/lysosomal content in non-specialized cells, and that this mechanism is responsible for the decreased cholesterol overload in Niemann-Pick type C cells. We also find that the secretion of the endo/lysosome content occurs via a mechanism dependent on the endosomal calcium channel MCOLN1, as well as FYCO1, the AP1 adaptor and its partner Gadkin. We conclude that endo-lysosomes in non-specialized cells can acquire secretory functions elicited by cyclodextrin, and that this pathway is responsible for the decrease in cholesterol storage in Niemann-Pick C cells.
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