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Related Experiment Video

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Dissection and Imaging of Active Zones in the Drosophila Neuromuscular Junction
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Sphingolipids regulate neuromuscular synapse structure and function in Drosophila.

Ryan J H West1, Laura Briggs1, Maria Perona Fjeldstad2

  • 1Department of Biology and Hull York Medical School, University of York, Heslington, York YO10 5DD, UK.

The Journal of Comparative Neurology
|May 16, 2018
PubMed
Summary
This summary is machine-generated.

Sphingolipids regulate synapse structure and function. Mutations in the Serine Palmitoyl-transferase (SPT) enzyme subunit, lace, disrupt synaptic bouton size and number, impacting synaptic transmission.

Keywords:
RRID:AB_10694715RRID:AB_2166869RRID:AB_2314867RRID:AB_2338959RRID:AB_2713991RRID:AB_330924RRID:AB_528203RRID:AB_528484lipid raftsneuromuscular junctionsynaptic adhesionsynaptic bouton

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Biochemistry

Background:

  • Sphingolipids are abundant at synapses and are implicated in regulating synapse structure, function, and degeneration.
  • The precise role of sphingolipids in synaptic regulation remains largely unknown.
  • Serine Palmitoyl-transferase (SPT) catalyzes the initial step in sphingolipid biosynthesis.

Purpose of the Study:

  • To investigate the role of sphingolipids in synaptic structure and function using Drosophila melanogaster.
  • To elucidate the function of the SPT enzyme subunit, lace/SPTLC2, at the neuromuscular junction (NMJ).
  • To explore the relationship between sphingolipids and the synaptic adhesion molecule Basigin (Bsg).

Main Methods:

  • Analysis of Drosophila larval neuromuscular junction (NMJ) in lace/SPTLC2 mutants.
  • Electrophysiological characterization of synaptic transmission at lace mutant synapses.
  • Investigating the interaction between lace mutations and Basigin (Bsg) in double mutant combinations.

Main Results:

  • Mutations in lace/SPTLC2 led to reduced bouton number and enlarged boutons at the Drosophila NMJ.
  • Lace mutant synapses exhibited strong synaptic transmission with a prevalence of depression over facilitation.
  • Lace mutants showed abnormal accumulation of Basigin (Bsg) at synapses, suggesting Bsg requires sphingolipids for synaptic regulation.

Conclusions:

  • Sphingolipids play a crucial role in the fine-tuning of synaptic structure and function.
  • The regulation of synaptic structure by sphingolipids may be mediated through the activity of Basigin (Bsg).
  • This study highlights a novel link between sphingolipid metabolism and synaptic adhesion molecules in maintaining synaptic integrity.