Chronic neonatal phencyclidine treatment produces age-related changes in pentylenetetrazol-induced seizures.
Although excitatory amino acids are known to play a critical role in the plasticity of developing brain, the behavioral effects of blocking the N-methyl-D-aspartate (NMDA) receptor-gated ion channel during development are not clear. Here we report the effects of chronic postnatal administration of 1-phenylcyclohexylpiperidine (phencyclidine or PCP), a NMDA channel blocker, on seizure susceptibility. To study the short-term effects of chronic PCP administration on pentylenetetrazol (PTZ)-induced seizures, rats were treated with PCP (5 mg/kg, i.p.) for 11 days from postnatal days 5-15, 24-34 or 44-54 and tested in the PTZ-induced seizure paradigm on postnatal days 21, 40 and 60, respectively. Administration of PCP in 5-15-day-old rats resulted in increased seizure susceptibility at day 21, while administration of PCP in postweanling rats (days 24-34) markedly attenuated their susceptibility to seizures at day 40. PCP injection had little effect on the seizure susceptibility of older rats. To study the long-term effects of postnatal PCP treatment, rats were injected with PCP (5 mg/kg from postnatal day 5-15, i.p.) and were tested for PTZ-induced seizures on postnatal days 40 and 60; each rat was tested only once. When tested for PTZ-induced seizure on day 40, PCP-treated rats did not differ from saline-treated controls. When tested on day 60, PCP-treated rats had a lower incidence of seizures and in the rats that did have seizures their latencies were significantly prolonged compared to controls. Together, our data suggest that chronic PCP administration alters PTZ-induced seizure susceptibility in an age-dependent manner and chronic PCP administration in postnatal rats produces long-term changes that persist into adulthood.
Sircar
R
R
Department of Psychiatry, Albert Einstein College of Medicine/Montefiore Medical Center, Bronx, NY 10461.
Veliskova
J
J
Moshe
S L
SL
D000375:Aging / Q000473:pathology; D000818:Animals; D000831:Animals, Newborn; D000927:Anticonvulsants / Q000494:pharmacology*; D010433:Pentylenetetrazole / Q000037:antagonists & inhibitors*; D010622:Phencyclidine / Q000494:pharmacology*; D051381:Rats; D017207:Rats, Sprague-Dawley; D012640:Seizures / Q000139:chemically induced / Q000473:pathology / Q000517:prevention & control*; D013997:Time Factors
D000927:Anticonvulsants; D010622:Phencyclidine; D010433:Pentylenetetrazole