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Can a generalized kindling seizure induce a reward state?
R G Paredes1, G Muzzi, E Aguirre
1Centro de Neurobiologia, Universidad Nacional Autónoma de México, Querétaro. rparedes@servidor.unam.mx
Epilepsy Research
|January 21, 2000
Summary
Seizure-induced behavioral depression in rats is linked to opioid release. This opioid release, following a stage 5 kindling seizure, can create a rewarding effect, demonstrated by place preference conditioning.
Area of Science:
- Neuroscience
- Behavioral Neuroscience
- Neuropharmacology
Background:
- Postictal behavioral depression (PBD) after seizures is opioid-dependent.
- Opioid antagonists like naloxone and naltrexone reduce PBD.
- Opioids induce rewarding effects measurable by place preference conditioning (PPC).
Purpose of the Study:
- To investigate if opioid release post-seizure induces place preference conditioning (PPC).
- To determine if opioid release following a stage 5 kindling seizure can create a rewarding experience.
Main Methods:
- Rats were kindled in specific brain regions (MPOA, AMG, IC).
- Initial chamber preference was established.
- Kindled rats received a stage 5 seizure stimulus, followed by placement in a non-preferred chamber during PBD.
- Conditioning involved alternating days in the non-preferred (with seizure) and preferred (without seizure) chambers.
Main Results:
- Kindled rats developed a significant change in preference towards the chamber associated with the seizure.
- Naloxone administration completely blocked this induced change in preference.
- This indicates that opioid release post-seizure is responsible for the observed conditioning.
Conclusions:
- Opioid release following a stage 5 kindling seizure can induce a positive affective state.
- This opioid-mediated effect is strong enough to drive place preference conditioning.
- The findings link seizure-induced neurochemical changes to behavioral conditioning through opioid pathways.