Long-term behavioral and morphological consequences of nonconvulsive status epilepticus in rats.
The aims of the present study were to ascertain whether nonconvulsive status epilepticus (NCSE) could give rise to long-term behavioral deficits and permanent brain damage. Two months after NCSE was elicited with pilocarpine (15 mg/kg i.p.) in LiCl-pretreated adult male rats, animals were assigned to either behavioral (spontaneous behavior, social interaction, elevated plus-maze, rotorod, and bar-holding tests) or EEG studies. Another group of animals was sacrificed and their brains were processed for Nissl and Timm staining as well as for parvalbumin and calbindin immunohistochemistry. Behavioral analysis revealed motor deficits (shorter latencies to fall from rotorod as well as from bar) and disturbances in the social behavior of experimental animals (decreased interest in juvenile conspecific). EEGs showed no apparent abnormalities. Quantification of immunohistochemically stained sections revealed decreased amounts of parvalbumin- and calbindin-immunoreactive neurons in the motor cortex and of parvalbumin-positive neurons in the dentate gyrus. Despite relatively inconspicuous manifestations, NCSE may represent a risk for long-term deficits.
Krsek
Pavel
P
Institute of Physiology, Academy of Sciences of the Czech Republic, Vídenská 1083, CZ 142 20 Prague 4, Czech Republic.
Mikulecká
Anna
A
Druga
Rastislav
R
Kubová
Hana
H
Hlinák
Zdenek
Z
Suchomelová
Lucie
L
Mares
Pavel
P
D000818:Animals; D001143:Arousal / Q000502:physiology; D001522:Behavior, Animal / Q000502:physiology*; D001921:Brain / Q000187:drug effects / Q000473:pathology / Q000503:physiopathology; D001925:Brain Damage, Chronic / Q000139:chemically induced / Q000473:pathology / Q000503:physiopathology*; D001931:Brain Mapping; D064026:Calbindins; D003292:Convulsants; D004569:Electroencephalography; D008032:Limbic System / Q000473:pathology / Q000503:physiopathology; D018021:Lithium Chloride; D008297:Male; D018782:Maze Learning / Q000502:physiology; D009043:Motor Activity / Q000502:physiology; D009048:Motor Skills / Q000502:physiology; D019579:Neocortex / Q000473:pathology / Q000503:physiopathology; D010320:Parvalbumins / Q000032:analysis; D010862:Pilocarpine; D004856:Postural Balance / Q000502:physiology; D051381:Rats; D017208:Rats, Wistar; D011930:Reaction Time / Q000502:physiology; D064030:S100 Calcium Binding Protein G / Q000032:analysis; D012919:Social Behavior; D013226:Status Epilepticus / Q000139:chemically induced / Q000473:pathology / Q000503:physiopathology*; D014741:Video Recording
D064026:Calbindins; D003292:Convulsants; D010320:Parvalbumins; D064030:S100 Calcium Binding Protein G; D010862:Pilocarpine; D018021:Lithium Chloride