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Autoimmunity to munc-18 in Rasmussen's encephalitis

R Yang1, R S Puranam, L S Butler

  • 1Department of Medicine, Duke University Medical Center, Durham, North Carolina 27710, USA.

Neuron
|January 6, 2001
PubMed

Insights

Rasmussen's encephalitis (RE) patients may have autoantibodies against both GluR3 and munc-18 proteins. This dual attack on synaptic proteins could worsen seizures and neuronal death in this rare neurological disease.

Area of Science:

  • Neuroimmunology
  • Neurology
  • Molecular Neuroscience

Background:

  • Rasmussen's encephalitis (RE) is a rare autoimmune CNS disease.
  • It involves seizures, hemisphere degeneration, and autoantibodies against the postsynaptic glutamate receptor subunit GluR3.

Observation:

  • A single RE patient exhibited high-titer autoantibodies against munc-18.
  • This patient also had previously identified anti-GluR3 antibodies.

Findings:

  • Munc-18 is an intracellular presynaptic protein crucial for neurotransmitter secretion.
  • The presence of autoantibodies against both GluR3 (postsynaptic) and munc-18 (presynaptic) suggests intermolecular epitope spreading.
  • This dual immune attack targets distinct steps in synaptic transmission.

Implications:

  • Co-targeting of GluR3 and munc-18 may synergistically impair synaptic function.
  • This could contribute to the severe seizures and neuronal death observed in Rasmussen's encephalitis.
  • Further research into these autoantibodies may reveal new diagnostic or therapeutic targets for RE.

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