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Interleukin-1beta enhances NMDA receptor-mediated current but inhibits excitatory synaptic transmission

Sheng Yang1, Zhen-Wei Liu, Lei Wen

  • 1Beijing Institute of Pharmacology and Toxicology, 27 Taiping Road, Haidian District, Beijing 100850, China.

Brain Research
|February 17, 2005
PubMed

Insights

Interleukin (IL)-1beta reduces synaptic activity frequency in rat hippocampal neurons. It also enhances NMDA receptor currents and voltage-dependent calcium currents, suggesting a role in modulating hippocampus functions.

Area of Science:

  • Neuroscience
  • Immunology
  • Cellular Biology

Background:

  • Interleukin (IL)-1beta is a key proinflammatory cytokine.
  • IL-1beta plays diverse roles in central nervous system (CNS) pathophysiology.
  • Its specific effects on neuronal signaling in the hippocampus require elucidation.

Purpose of the Study:

  • To investigate the effects of IL-1beta on synaptic activity in cultured rat hippocampal neurons.
  • To determine how IL-1beta influences N-methyl-D-aspartate (NMDA) receptor-mediated currents.
  • To examine the impact of IL-1beta on voltage-dependent calcium currents (I(Ca)).

Main Methods:

  • Whole-cell recording technique applied to cultured rat hippocampal neurons.
  • Measurement of spontaneous excitatory postsynaptic currents (sEPSC) and miniature excitatory postsynaptic currents (mEPSC).
  • Assessment of NMDA-evoked currents and voltage-dependent Ca2+ currents (I(Ca)).

Main Results:

  • IL-1beta (10 or 100 ng/ml) decreased the frequency, but not amplitude, of sEPSCs and mEPSCs.
  • IL-1beta significantly increased NMDA receptor-mediated currents.
  • IL-1beta (10 ng/ml) enhanced the amplitude of I(Ca), primarily through L-type calcium channels.

Conclusions:

  • IL-1beta modulates synaptic transmission frequency in the hippocampus.
  • IL-1beta enhances neuronal excitability via NMDA receptor potentiation.
  • IL-1beta influences hippocampal function through alterations in synaptic activity and calcium signaling.

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