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Related Experiment Videos

Prion protein is necessary for normal synaptic function

J Collinge1, M A Whittington, K C Sidle

  • 1Department of Biochemistry and Molecular Genetics, St Mary's Hospital Medical School, Imperial College, London, UK.

Nature
|July 28, 1994
PubMed
Summary
This summary is machine-generated.

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Prion protein (PrPC) loss in mice impairs brain synaptic function, specifically weakening gamma-aminobutyric acid type A (GABA_A) receptor-mediated inhibition and long-term potentiation. This suggests PrPC loss may contribute to neurodegeneration in prion diseases.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Genetics

Background:

  • Prion diseases are fatal neurodegenerative disorders including Creutzfeldt-Jakob disease.
  • Prions are composed of a modified host glycoprotein (PrPSc), differing from the normal cellular form (PrPC).
  • The precise function of normal cellular PrPC remains largely unknown, despite its conservation and expression.

Purpose of the Study:

  • To investigate the physiological role of the prion protein (PrPC) in synaptic function.
  • To determine if PrPC deficiency impacts neuronal inhibition and plasticity.

Main Methods:

  • Utilized PrP null mice lacking the PrP gene.
  • Examined hippocampal slices to assess synaptic transmission.
  • Measured gamma-aminobutyric acid type A (GABA_A) receptor-mediated fast inhibition.

Related Experiment Videos

  • Evaluated long-term potentiation (LTP) in hippocampal slices.

    • Main Results:

    • Hippocampal slices from PrP null mice exhibited significantly weakened GABA_A receptor-mediated fast inhibition.
    • Long-term potentiation was impaired in PrP null mice.
    • These synaptic deficits were observed in the absence of apparent developmental or behavioral abnormalities.

    Conclusions:

    • The prion protein (PrPC) plays a crucial role in maintaining normal synaptic function, particularly GABAergic inhibition and synaptic plasticity.
    • Loss of PrPC function may underlie the synaptic dysfunction observed in prion diseases.
    • These findings suggest that impaired synaptic inhibition could contribute to the epileptiform activity and neurodegeneration seen in Creutzfeldt-Jakob disease.