Regional neural activity within the substantia nigra during peri-ictal flurothyl generalized seizure stages.
Structures responsible for the onset, propagation, and cessation of generalized seizures are not known. Lesion and microinfusion studies suggest that the substantia nigra pars reticulata (SNR) seizure-controlling network could play a key role. However, the expression of neural activity within the SNR and its targets during discrete pre- and postictal periods has not been investigated. In rats, we used flurothyl to induce generalized seizures over a controlled time period and 2-deoxyglucose autoradiography mapping technique. Changes in neural activity within the SNR were region-specific. The SNRposterior was selectively active during the pre-clonic period and may represent an early gateway to seizure propagation. The SNRanterior and superior colliculus changed their activity during progression to tonic-clonic seizure, suggesting the involvement in coordinated regional activity that results in inhibitory effects on seizures. The postictal suppression state was correlated with changes in the SNR projection targets, specifically the pedunculopontine tegmental nucleus and superior colliculus.
Velísková
Jana
J
Department of Neurology, Albert Einstein College of Medicine, AECOM, K314, 1410 Pelham Parkway South, Bronx, NY 10461, USA. jvelisko@aecom.yu.edu
Miller
Alexandra M
AM
Nunes
Magda L
ML
Brown
Lucy L
LL
D000200:Action Potentials / Q000187:drug effects / Q000502:physiology; D000818:Animals; D001345:Autoradiography; D001931:Brain Mapping; D003292:Convulsants / Q000494:pharmacology; D003847:Deoxyglucose / Q000378:metabolism; D004195:Disease Models, Animal; D004734:Energy Metabolism / Q000187:drug effects / Q000502:physiology; D004827:Epilepsy / Q000139:chemically induced / Q000503:physiopathology*; D005481:Flurothyl / Q000494:pharmacology; D008297:Male; D009433:Neural Inhibition / Q000187:drug effects / Q000502:physiology; D009434:Neural Pathways / Q000187:drug effects / Q000378:metabolism / Q000503:physiopathology*; D009474:Neurons / Q000187:drug effects / Q000502:physiology*; D045042:Pedunculopontine Tegmental Nucleus / Q000187:drug effects / Q000378:metabolism / Q000503:physiopathology; D051381:Rats; D017207:Rats, Sprague-Dawley; D013378:Substantia Nigra / Q000187:drug effects / Q000378:metabolism / Q000503:physiopathology*; D013477:Superior Colliculi / Q000187:drug effects / Q000378:metabolism / Q000503:physiopathology; D009435:Synaptic Transmission / Q000187:drug effects / Q000502:physiology; D020651:Ventral Thalamic Nuclei / Q000187:drug effects / Q000378:metabolism / Q000503:physiopathology
D003292:Convulsants; D003847:Deoxyglucose; D005481:Flurothyl