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Resources » Paper

Marza E et al. (2008) Mol Biol Cell "Polyunsaturated fatty acids influence synaptojanin localization to regulate synaptic vesicle recycling."

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  • Comments on Marza E et al. (2008) Mol Biol Cell "Polyunsaturated fatty acids influence synaptojanin localization to regulate synaptic vesicle recycling." (0)

  • Overview

    PMID:
    18094048
    DOI:
    10.1091/mbc.E07-07-0719
    Status:
    Publication type:
    Journal_article
    WormBase ID:
    WBPaper00031343

    Marza E, Long T, Saiardi A, Sumakovic M, Eimer S, Hall DH, & Lesa GM (2008). Polyunsaturated fatty acids influence synaptojanin localization to regulate synaptic vesicle recycling. Mol Biol Cell, 19, 833-42. doi:10.1091/mbc.E07-07-0719

    Monitoring Editor: Howard Riezman The lipid polyunsaturated fatty acids are highly enriched in synaptic membranes, including synaptic vesicles, but their precise function there is unknown. C. elegans fat-3 mutants lack long-chain polyunsaturated fatty acids (LC-PUFAs); they release abnormally low levels of serotonin and acetylcholine and are depleted of synaptic vesicles, but the mechanistic basis of these defects is unclear. Here we demonstrate that synaptic vesicle endocytosis is impaired in the mutants: the synaptic vesicle protein synaptobrevin is not efficiently retrieved after synaptic vesicles fuse with the presynaptic membrane, and the presynaptic terminals contain abnormally large endosomal-like compartments and synaptic vesicles. Moreover, the mutants have abnormally low levels of the phosphoinositide phosphatase synaptojanin at release sites and accumulate the main synaptojanin substrate phosphatidylinositol 4,5-bisphosphate at these sites. Both synaptobrevin and synaptojanin mislocalization can be rescued by providing exogenous arachidonic acid, an LC-PUFA, suggesting that the endocytosis defect is caused by LC-PUFA depletion. By showing that the genes fat-3 and synaptojanin act in the same endocytic pathway at synapses, our findings suggest that LC-PUFAs are required for efficient synaptic vesicle recycling, probably by modulating synaptojanin localization at synapses.


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