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NMDA receptor antagonists decrease GABA outflow from the septum and increase acetylcholine outflow from the

M G Giovannini1, D Mutolo, L Bianchi

  • 1Department of Preclinical and Clinical Pharmacology, University of Florence, Italy.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|March 1, 1994
PubMed
Summary
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This study reveals that NMDA receptors in the septum activate GABAergic neurons, which then inhibit cholinergic neurons in the septohippocampal pathway. This finding clarifies the glutamatergic and GABAergic control of acetylcholine release in the hippocampus.

Area of Science:

  • Neuroscience
  • Neuropharmacology

Background:

  • The septohippocampal cholinergic pathway is crucial for cognitive functions.
  • Understanding the regulation of this pathway by neurotransmitters is essential for neurological research.

Purpose of the Study:

  • To investigate the role of glutamatergic and GABAergic inputs in modulating the septohippocampal cholinergic pathway.
  • To elucidate the specific mechanisms by which NMDA receptors influence acetylcholine (ACh) outflow in the hippocampus.

Main Methods:

  • Microdialysis in freely moving rats to measure ACh outflow in the hippocampus and GABA outflow in the septum.
  • Intracerebroventricular (ICV) and local septal administration of NMDA receptor antagonists (CPP, MK801) and GABA agonists (muscimol).
  • High-performance liquid chromatography (HPLC) with electrochemical and fluorescence detection for neurotransmitter quantification.

Related Experiment Videos

Main Results:

  • ICV administration of NMDA antagonists dose-dependently increased hippocampal ACh outflow.
  • Local septal perfusion with CPP decreased septal GABA outflow and increased hippocampal ACh outflow.
  • GABAergic inhibition of cholinergic septohippocampal neurons was confirmed; NMDA receptor activation in the septum tonically inhibits these neurons via GABA.

Conclusions:

  • NMDA receptors in the septum exert tonic control over cholinergic septohippocampal neurons.
  • This control is mediated by the activation of GABAergic interneurons in the septum.
  • The findings provide insights into the neurochemical regulation of hippocampal acetylcholine release.