Abstract:
:The complex lipid constituents of the eukaryotic plasma membrane are precisely controlled in a cell-type-specific manner, suggesting an important, but as yet, unknown cellular function. Neuronal membranes are enriched in long-chain polyunsaturated fatty acids (LC-PUFAs) and alterations in LC-PUFA metabolism cause debilitating neuronal pathologies. However, the physiological role of LC-PUFAs in neurons is unknown. We have characterized the neuronal phenotype of C. elegans mutants depleted of LC-PUFAs. The C. elegans genome encodes a single Delta6-desaturase gene (fat-3), an essential enzyme for LC-PUFA biosynthesis. Animals lacking fat-3 function do not synthesize LC-PUFAs and show movement and egg-laying abnormalities associated with neuronal impairment. Expression of functional fat-3 in neurons, or application of exogenous LC-PUFAs to adult animals rescues these defects. Pharmacological, ultrastructural and electrophysiological analyses demonstrate that fat-3 mutant animals are depleted of synaptic vesicles and release abnormally low levels of neurotransmitter at cholinergic and serotonergic neuromuscular junctions. These data indicate that LC-PUFAs are essential for efficient neurotransmission in C. elegans and may account for the clinical conditions associated with mis-regulation of LC-PUFAs in humans.
journal_name
J Cell Scijournal_title
Journal of cell scienceauthors
Lesa GM,Palfreyman M,Hall DH,Clandinin MT,Rudolph C,Jorgensen EM,Schiavo Gdoi
10.1242/jcs.00918keywords:
subject
Has Abstractpub_date
2003-12-15 00:00:00pages
4965-75issue
Pt 24eissn
0021-9533issn
1477-9137pii
116/24/4965journal_volume
116pub_type
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