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Opioid peptide release in the rat hippocampus after kainic acid‐induced status epilepticus

Opioid peptide release in the rat hippocampus after kainic acid‐induced status epilepticus It has been suggested that kainic acid enhances opioid peptide release. However, no direct evidence exists to support this hypothesis. The main aim of the present study was to determine whether such release occurs in the hippocampus of the rat after status epilepticus induced by kainic acid. Microdialysis experiments revealed significant opioid peptide release in the hippocampus 90–150 min (100%) and 270–300 min (50%) after kainic acid‐induced status epilepticus. The peptides released were identified by high‐performance liquid chromatography linked to radioimmunoassay as Met‐enkephalin, Leu‐enkephalin, Dynorphin‐A (1–6), and Dynorphin‐A (1–8). Reduced extracellular opioid peptide immunoreactivity was detected 28 days after status epilepticus (38% compared with control situation). The present results indicate an important activation of opioid peptide systems by kainic acid‐induced status epilepticus. In addition, the reduced hippocampal extracellular opioid peptide levels long‐term after kainic acid administration could have important implications for the progressive nature of epileptogenesis. Hippocampus 2003;13:472–480. © 2003 Wiley‐Liss, Inc. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Hippocampus Wiley

Opioid peptide release in the rat hippocampus after kainic acid‐induced status epilepticus

Hippocampus , Volume 13 (4) – Jan 1, 2003

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References (58)

Publisher
Wiley
Copyright
Copyright © 2003 Wiley‐Liss, Inc.
ISSN
1050-9631
eISSN
1098-1063
DOI
10.1002/hipo.10078
pmid
12836916
Publisher site
See Article on Publisher Site

Abstract

It has been suggested that kainic acid enhances opioid peptide release. However, no direct evidence exists to support this hypothesis. The main aim of the present study was to determine whether such release occurs in the hippocampus of the rat after status epilepticus induced by kainic acid. Microdialysis experiments revealed significant opioid peptide release in the hippocampus 90–150 min (100%) and 270–300 min (50%) after kainic acid‐induced status epilepticus. The peptides released were identified by high‐performance liquid chromatography linked to radioimmunoassay as Met‐enkephalin, Leu‐enkephalin, Dynorphin‐A (1–6), and Dynorphin‐A (1–8). Reduced extracellular opioid peptide immunoreactivity was detected 28 days after status epilepticus (38% compared with control situation). The present results indicate an important activation of opioid peptide systems by kainic acid‐induced status epilepticus. In addition, the reduced hippocampal extracellular opioid peptide levels long‐term after kainic acid administration could have important implications for the progressive nature of epileptogenesis. Hippocampus 2003;13:472–480. © 2003 Wiley‐Liss, Inc.

Journal

HippocampusWiley

Published: Jan 1, 2003

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