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The genetically epilepsy-prone rat.

C L Faingold1

  • 1Department of Pharmacology, Southern Illinois University, School of Medicine, Springfield 62708.

General Pharmacology
|January 1, 1988
PubMed
Summary
This summary is machine-generated.

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The genetically epilepsy-prone rat (GEPR) model reveals that altered GABA and excitatory amino acid (EAA) function in the inferior colliculus (IC) contributes to audiogenic seizures (AGS). These neurochemical changes in the IC are key to understanding epilepsy mechanisms.

Area of Science:

  • Neuroscience
  • Epilepsy Research
  • Animal Models

Background:

  • The genetically epilepsy-prone rat (GEPR) is a valuable genetic model for studying epilepsy mechanisms.
  • GEPRs exhibit audiogenic seizures (AGS) and heightened sensitivity to various seizure-inducing stimuli.
  • Neurophysiological and neurochemical abnormalities are present in GEPRs, particularly within the auditory pathway.

Purpose of the Study:

  • To investigate the role of the inferior colliculus (IC) and neurotransmitter systems in the audiogenic seizures (AGS) of genetically epilepsy-prone rats (GEPRs).
  • To elucidate the specific neurochemical mechanisms underlying seizure susceptibility in the GEPR model.

Main Methods:

  • Neurophysiological recordings in the inferior colliculus (IC) of GEPRs.
  • Microinjection studies using GABA agonists/antagonists and excitatory amino acid (EAA) antagonists/agonists into brainstem auditory nuclei and IC.

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  • Measurement of neurotransmitter levels and neuronal function in GEPR brains.

    • Main Results:

    • GEPRs show abnormal electroencephalographic patterns, increased auditory evoked potential thresholds, and altered neuronal activity in the IC, including reduced sound-induced inhibition.
    • Deficits in norepinephrine and serotonin, increased GABAergic neurons, and reduced GABA effectiveness were observed in the IC of GEPRs.
    • Manipulation of GABA and EAA systems in the IC and brainstem auditory nuclei significantly affected AGS susceptibility in GEPRs and normal rats.

    Conclusions:

    • Altered excitatory amino acid (EAA) release and reduced GABAergic effectiveness in the inferior colliculus (IC) are critical seizure initiation mechanisms in genetically epilepsy-prone rats (GEPRs).
    • The auditory pathway, including nuclei up to the IC, plays a significant role in the audiogenic seizure (AGS) pathway in GEPRs.