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Hippocampal opioid peptides and seizures
1Laboratory of Molecular and Integrative Neuroscience, National Institute of Environmental Health Sciences, Research Triangle Park, NC 27709.
Epilepsy Research. Supplement
|January 1, 1992
Summary
Seizures alter hippocampal opioid peptides, increasing enkephalin but decreasing dynorphin long-term. Opioid peptides, particularly hippocampal enkephalin, are crucial for specific seizure behaviors, challenging established pathways.
Area of Science:
- Neuroscience
- Molecular Biology
- Pharmacology
Background:
- Opioid peptides play a role in neurological functions.
- Understanding their dynamic changes during seizures is crucial.
Purpose of the Study:
- To investigate the dynamic changes in hippocampal opioid peptides (enkephalin and dynorphin) during seizures.
- To elucidate the role of opioid peptides in seizure-related behaviors and pathways.
Main Methods:
- Molecular biological approaches.
- Experimental models including electroconvulsive shocks (ECS), amygdaloid kindling, and kainic acid administration.
- Electrical stimulation of the perforant pathway.
- Lesioning of the granular-mossy fiber pathway.
Main Results:
- ECS and kindling induced differential long-term changes in enkephalin (increase) and dynorphin (decrease) biosynthesis.
- Perforant pathway stimulation mimicked ECS and kindling effects on opioid peptide turnover.
- Hippocampal enkephalin was essential for kainic acid-induced wet dog shakes.
- Ventral granular-mossy fiber pathway mediated wet dog shakes but not convulsive seizures.
- Granular-mossy fiber pathway destruction potentiated kainic acid-induced seizures and cell loss.
Conclusions:
- Hippocampal opioid peptide dynamics differ significantly during various seizure types.
- Opioid peptides are critical mediators of specific seizure-related behaviors.
- The granular-mossy fiber pathway has distinct roles in behavior and seizure pathology, challenging existing paradigms.