Genetically Epileptic Mice Have Elevated Enkephalin — A Clue to Seizure Biology
Met-enkephalin was significantly elevated in the cortex, hippocampus, and brainstem of genetically epileptic tg/tg mice, while beta-endorphin and dynorphin were unchanged.
Quick Facts
What This Study Found
Met-enkephalin was significantly elevated in cortex, hippocampus, and brainstem of tg/tg epileptic mice. Beta-endorphin and dynorphin were unchanged.
Key Numbers
How They Did This
Brain regions from 15-18 week old tg/tg and control mice were dissected. Met-enkephalin, beta-endorphin, and dynorphin levels were measured by radioimmunoassay.
Why This Research Matters
Elevated enkephalin in seizure-prone brain regions suggests the opioid system is actively involved in epilepsy. This could help develop new anti-seizure treatments targeting opioid pathways.
The Bigger Picture
The selective enkephalin elevation in seizure-prone brain regions could represent the brain's attempt to use opioid peptides as natural anticonvulsants — or could paradoxically contribute to seizure generation. Understanding this could lead to opioid-targeted epilepsy treatments.
What This Study Doesn't Tell Us
Genetic mouse model that may not represent all forms of human epilepsy. Measurements show total levels, not release rates. Cannot determine if elevated enkephalin is cause or effect of seizures.
Questions This Raises
- ?Is elevated enkephalin protective against or contributing to seizures?
- ?Do epilepsy patients have altered opioid peptide levels?
Trust & Context
- Key Stat:
- Elevated met-enkephalin in 3 seizure regions Cortex, hippocampus, and brainstem of epileptic tg/tg mice had significantly increased met-enkephalin
- Evidence Grade:
- Preliminary animal study in a single genetic epilepsy model. Cannot determine if elevated enkephalin is cause or effect.
- Study Age:
- Published in 1991. Opioid peptide involvement in epilepsy has been further explored.
- Original Title:
- Increased methionine-enkephalin levels in genetically epileptic (tg/tg) mice.
- Published In:
- Brain research bulletin, 27(6), 849-52 (1991)
- Authors:
- Patel, V K, Abbott, L C, Rattan, A K, Tejwani, G A
- Database ID:
- RPEP-00206
Evidence Hierarchy
Tests effects in animals (usually mice or rats), not humans.
What do these levels mean? →Frequently Asked Questions
Are the elevated enkephalins helping or hurting?
Unclear. Met-enkephalin can have both anticonvulsant and pro-convulsant effects depending on the receptor type and brain region. The elevation could be a compensatory attempt to suppress seizures, or could contribute to seizure propagation.
Could this apply to human epilepsy?
The tg/tg mouse produces seizures similar to human generalized epilepsy. If opioid peptide changes are confirmed in epilepsy patients, it could open new treatment avenues targeting the enkephalin system.
Read More on RethinkPeptides
Cite This Study
https://rethinkpeptides.com/research/RPEP-00206APA
Patel, V K; Abbott, L C; Rattan, A K; Tejwani, G A. (1991). Increased methionine-enkephalin levels in genetically epileptic (tg/tg) mice.. Brain research bulletin, 27(6), 849-52.
MLA
Patel, V K, et al. "Increased methionine-enkephalin levels in genetically epileptic (tg/tg) mice.." Brain research bulletin, 1991.
RethinkPeptides
RethinkPeptides Research Database. "Increased methionine-enkephalin levels in genetically epilep..." RPEP-00206. Retrieved from https://rethinkpeptides.com/research/patel-1991-increased-methionineenkephalin-levels-in
Access the Original Study
Study data sourced from PubMed, a service of the U.S. National Library of Medicine, National Institutes of Health.
This study breakdown was produced by the RethinkPeptides research team. We analyze and report published research findings without making health recommendations. All interpretations are based solely on the published abstract and study data.