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Interleukin-1 modulates GABAergic and glutamatergic function in brain

L G Miller1, J M Fahey

  • 1Department of Pharmacology and Experimental Therapeutics, Tufts University School of Medicine, Boston, Massachusetts 02111.

Annals of the New York Academy of Sciences
|October 31, 1994
PubMed
Summary

Interleukin-1 (IL-1) enhances the inhibitory neurotransmitter GABA and reduces the excitatory neurotransmitter glutamate activity in the brain. These findings suggest IL-1 modulates key brain neurotransmitter systems.

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Area of Science:

  • Neuroscience
  • Immunology
  • Biochemistry

Background:

  • Interleukin-1 (IL-1) is a key cytokine in the acute-phase response.
  • Neurotransmitter systems, including GABAergic (inhibitory) and glutamatergic (excitatory), are crucial for brain function.

Purpose of the Study:

  • To investigate the effects of IL-1 on the major inhibitory (GABA) and excitatory (glutamate) neurotransmitter systems in the brain.
  • To determine if IL-1 modulates GABA-dependent chloride uptake and glutamate-mediated intracellular calcium signaling.

Main Methods:

  • Assessed GABA-dependent chloride uptake in cortical synaptoneurosomes treated with IL-1.
  • Examined the impact of IL-1 on NMDA and glycine-induced intracellular calcium concentrations in cultured chick cortical neurons.
  • Utilized IL-1 receptor antagonist, IL-6, TNF, and CNQX to probe the mechanisms involved.

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Main Results:

  • IL-1 significantly enhanced GABA-dependent chloride uptake in a dose-dependent manner.
  • The enhancing effect of IL-1 on GABA was blocked by an IL-1 receptor antagonist.
  • IL-1 decreased NMDA and glycine-induced calcium responses, an effect attenuated by CNQX.

Conclusions:

  • Interleukin-1 plays a significant role in modulating both inhibitory and excitatory neurotransmission in the brain.
  • These findings highlight the complex interplay between the immune system and central nervous system function.
  • IL-1's influence on neurotransmitter systems may have implications for understanding neuroinflammation and neurological disorders.