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Fusion of Secretory Vesicles with the Plasma Membrane01:26

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Proteins and neurotransmitters in secretory vesicles can be released from a cell upon vesicle docking, priming, and fusion with the plasma membrane. Vesicles are docked and primed in preparation for the quick exocytosis of their contents in response to a stimulus. The fusion process is mainly carried out by a SNAP Receptor or SNARE complex, consisting of synaptobrevin, syntaxin-1, and SNAP-25.
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Prion protein facilitates synaptic vesicle release by enhancing release probability.

Susan W Robinson1, Marie L Nugent2, David Dinsdale1

  • 1MRC Toxicology Unit, Hodgkin Building, Lancaster Road, Leicester LE1 9HN, UK.

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The cellular prion protein (PrP(C)) normally enhances synaptic function. A disease-linked mutation in PrP(C) diminishes these beneficial effects, potentially explaining prion disease pathogenesis through a loss-of-function mechanism.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Genetics

Background:

  • Cellular prion protein (PrP(C)) misfolding is linked to neurodegenerative prion diseases.
  • The physiological roles of PrP(C) and its specific involvement in disease pathogenesis remain unclear.
  • Prion diseases often arise sporadically due to spontaneous PrP(C) misfolding into neurotoxic PrP-scrapie (PrP(SC)).

Purpose of the Study:

  • To investigate the physiological signaling roles of wild-type PrP(C) at the synapse.
  • To examine the functional consequences of a disease-relevant proline-to-leucine mutation at codon 101 in PrP(C).
  • To explore the impact of PrP(C) and its mutant form on synaptic function and behavior.

Main Methods:

  • Utilized Drosophila melanogaster as a model organism to study PrP(C) function.
  • Expressed wild-type and mutated PrP(C) at the Drosophila neuromuscular junction.
  • Analyzed synaptic responses, including miniature synaptic currents and vesicle pool dynamics.
  • Conducted behavioral tests to assess locomotor activity.

Main Results:

  • Wild-type PrP(C) expression enhanced synaptic responses, indicated by larger miniature synaptic currents due to enlarged presynaptic vesicles.
  • Mutated PrP(C) expression reduced synaptic parameters compared to wild-type PrP(C).
  • Wild-type PrP(C) increased synaptic release probability and quantal content but decreased the ready-releasable vesicle pool size, effects partially lost in the mutant.

Conclusions:

  • Wild-type PrP(C) plays a novel functional role at the synapse, enhancing synaptic transmission.
  • A disease-associated PrP(C) mutation leads to diminished functional phenotypes, suggesting a loss-of-function mechanism in prion pathogenesis.
  • Compromised synaptic function of PrP(C) due to conversion to PrP(SC) may underlie neurodegeneration in prion diseases.