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Interleukin-1β causes synaptic hyperexcitability in multiple sclerosis.

Silvia Rossi1, Roberto Furlan, Valentina De Chiara

  • 1Neurological Clinic, Department of Neuroscience, Tor Vergata University, Rome, Italy.

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Summary
This summary is machine-generated.

Inflammation in multiple sclerosis (MS) enhances glutamate transmission and excitotoxicity via IL-1β signaling. This study reveals a synaptic mechanism linking MS inflammation to neurodegeneration, involving transient receptor potential vanilloid 1 channels.

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Area of Science:

  • Neuroscience
  • Immunology
  • Neuroinflammation

Background:

  • Inflammatory episodes in early multiple sclerosis (MS) correlate with later neurodegeneration.
  • The precise mechanism linking MS inflammation to delayed neuronal damage remains unclear.
  • Elevated glutamate activity is implicated in MS neurodegeneration.

Purpose of the Study:

  • To investigate if inflammatory cytokines in acute MS attacks enhance glutamate transmission and excitotoxicity in central neurons.
  • To elucidate the synaptic pathways involved in inflammation-driven neurodegeneration in MS.

Main Methods:

  • Compared cerebrospinal fluid (CSF) effects from active/quiescent MS patients on rodent brain slices.
  • Measured CSF cytokines (TNF-α, IL-1β, IL-1ra) and correlated with transcranial magnetic stimulation (TMS)-assessed cortical excitability in MS patients.
  • Assessed glutamate-mediated excitatory postsynaptic currents (EPSCs) and excitotoxic damage.

Main Results:

  • MS patient CSF increased EPSC frequency and neuronal swelling in vitro, dependent on IL-1β signaling and NMDA receptor stimulation.
  • Higher IL-1β/IL-1ra ratio in active MS CSF correlated with TMS-measured glutamate transmission.
  • Identified transient receptor potential vanilloid 1 channels as crucial for IL-1β's synaptic action.

Conclusions:

  • Demonstrated a synaptic mechanism connecting MS inflammation to excitotoxic neurodegeneration.
  • Highlighted the role of IL-1β signaling and TRVP1 channels in MS pathogenesis.
  • Provided evidence for inflammation-induced synaptic changes contributing to MS progression.