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Autoimmune seizures and epilepsy.

Christian Geis1, Jesus Planagumà2, Mar Carreño3

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Autoimmune epilepsy is increasingly diagnosed, but the risk varies. Autoantibodies targeting intracellular antigens pose a higher epilepsy risk than those targeting cell surface antigens, impacting neuronal function.

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Area of Science:

  • Neuroimmunology
  • Epileptology
  • Neurology

Background:

  • Growing number of encephalitis disorders linked to autoantibodies against neuronal proteins.
  • Increased use of "autoimmune epilepsy" term lacks focus on specific disease pathophysiology and epilepsy risk.
  • Most autoimmune encephalitides cause seizures, but progression to epilepsy is uncommon.

Purpose of the Study:

  • To trace the evolution of the concept of autoimmune epilepsy.
  • To examine inflammatory pathways potentially leading to epilepsy.
  • To review antibody-mediated encephalitis disorders associated with seizures and synaptic alterations.

Main Methods:

  • Literature review and conceptual analysis of autoimmune epilepsy.
  • Examination of inflammatory pathways in epilepsy development.
  • Review of antibody-mediated encephalitis, focusing on synaptic alterations in animal and neuronal models.

Main Results:

  • Epilepsy risk is higher in autoimmune disorders targeting intracellular antigens (T cell-mediated) versus cell surface antigens (antibody-mediated).
  • Autoantibodies against neuronal surface antigens often impair synaptic function and plasticity, causing hyperexcitability.
  • Specific antibodies (e.g., anti-NMDA, anti-AMPA, anti-LGI1, anti-GABAb) and their synaptic effects are highlighted through animal and neuronal models.

Conclusions:

  • The concept of autoimmune epilepsy requires nuanced understanding beyond general seizure presentation.
  • Distinct pathophysiological mechanisms underlie different autoimmune encephalitides and their epilepsy risk.
  • Further research into specific autoantibodies and synaptic alterations is crucial for understanding and managing autoimmune epilepsy.