Schizophrenia-like behavioral changes after partial hippocampal kindling.
The effect of hippocampal kindling on behavioral changes following 10 and 21 hippocampal afterdischarges (ADs) or electrographic seizures was examined in behaving rats. As compared to control, non-stimulated rats, 21 but not 10 hippocampal ADs resulted in a decrease in social contact, an increase in social isolation, and an increase in climbing and chasing behavior tested in an open field 3 days after cessation of kindling. Porsolt forced swimming test was not different among the control, 10- or 21-AD groups of rats. A deficit in sensorimotor gating, measured by prepulse inhibition of an acoustic startle, was observed in kindled as compared to control rats at 2 weeks after 21 ADs, but not after 10 ADs. Similarly, methamphetamine (1 mg/kg i.p.) induced higher locomotor activity in kindled rats, as compared to controls, after 21 ADs but not after 10 ADs. Spontaneous locomotor activity in a novel cage, without drug administration, was not different between kindled and control rats. These findings suggest that behavioral alterations after repeated hippocampal electrographic seizures may be mediated by increased dopaminergic functions, which may also mediate the psychiatric symptoms in human epileptic patients.
Ma
Jingyi
J
Department of Physiology and Pharmacology, The University of Western Ontario, Rhichmond, London, Ontario, Canada N6A 5A5. jma2@uwo.ca
Leung
L Stan
LS
D000161:Acoustic Stimulation; D000704:Analysis of Variance; D000818:Animals; D001522:Behavior, Animal; D000697:Central Nervous System Stimulants / Q000494:pharmacology; D004558:Electric Stimulation; D004833:Epilepsy, Temporal Lobe / Q000503:physiopathology; D005260:Female; D006624:Hippocampus / Q000502:physiology* / Q000528:radiation effects; D007696:Kindling, Neurologic / Q000187:drug effects / Q000502:physiology*; D008124:Locomotion / Q000187:drug effects / Q000502:physiology; D008297:Male; D008694:Methamphetamine / Q000494:pharmacology; D009043:Motor Activity / Q000187:drug effects / Q000502:physiology; D009433:Neural Inhibition / Q000187:drug effects; D051381:Rats; D020318:Rats, Long-Evans; D011930:Reaction Time; D013216:Reflex, Startle / Q000187:drug effects / Q000502:physiology; D012565:Schizophrenic Psychology; D012919:Social Behavior; D013997:Time Factors
D000697:Central Nervous System Stimulants; D008694:Methamphetamine