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- W2891491891 abstract "Docking, priming, and membrane fusion of secretory vesicles (i.e. regulated exocytosis) requires lipids and proteins. Sphingolipids, in particular, sphingosine and sphingosine-1-phosphate, have been implicated in the modulation of exocytosis. However, the specific exocytotic steps that sphingolipids modulate and the enzymes that regulate sphingolipid concentrations on native secretory vesicle membranes remain unknown. Here we use tightly coupled functional and molecular analyses of fusion-ready cell surface complexes and cortical vesicles isolated from oocytes to assess the role of sphingolipids in the late, Ca2+-triggered steps of exocytosis. The molecular changes resulting from treatments with sphingolipid modifying compounds coupled with immunoblotting analysis revealed the presence of sphingosine kinase on native vesicles; the presence of a sphingosine-1-phosphate phosphatase is also indicated. Changes in sphingolipid concentrations on vesicles altered their docking/priming, Ca2+-sensitivity, and ability to fuse, indicating that sphingolipid concentrations are tightly regulated and maintained at optimal levels and ratios to ensure efficient exocytosis." @default.
- W2891491891 created "2018-09-27" @default.
- W2891491891 creator A5004394777 @default.
- W2891491891 creator A5058280183 @default.
- W2891491891 date "2018-11-01" @default.
- W2891491891 modified "2023-09-24" @default.
- W2891491891 title "Sphingolipids modulate docking, Ca2+ sensitivity and membrane fusion of native cortical vesicles" @default.
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- W2891491891 doi "https://doi.org/10.1016/j.biocel.2018.09.001" @default.
- W2891491891 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30195064" @default.
- W2891491891 hasPublicationYear "2018" @default.
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