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Effects of prenatal administration of phencyclidine on the learning and memory processes of rat offspring
T Nabeshima1, M Hiramatsu, K Yamaguchi
1Faculty of Pharmaceutical Sciences, Meijo University, Nagoya, Japan.
Insights
Prenatal exposure to phencyclidine (PCP) in rats, even at non-teratogenic doses, impairs offspring learning and memory. This developmental toxicity affects both passive and active avoidance behaviors and reduces brain weight.
Area of Science:
- Neuroscience
- Developmental Toxicology
- Behavioral Pharmacology
Background:
- Prenatal exposure to drugs of abuse can lead to long-term neurodevelopmental deficits.
- Phencyclidine (PCP) is a dissociative anesthetic with known neurotoxic potential.
- Understanding the specific effects of prenatal PCP exposure on cognitive functions is crucial.
Purpose of the Study:
- To investigate the impact of prenatal phencyclidine (PCP) administration on learning and memory in rat offspring.
- To assess behavioral and physical changes in offspring exposed to sub-teratogenic doses of PCP during gestation.
- To evaluate the developmental toxicity of PCP.
Main Methods:
- Pregnant rats were administered phencyclidine (PCP) at doses of 10 or 20 mg/kg during critical periods of gestation (days 7-17 or 7-21).
- Offspring were assessed for learning and memory using passive avoidance response and pole-climbing avoidance response tasks at 4 and 7 weeks of age.
- Brain weight of the offspring was measured.
Main Results:
- Prenatal PCP exposure significantly disrupted the acquisition of passive avoidance response in 4-week-old offspring.
- Offspring exposed prenatally to PCP showed impaired performance in the pole-climbing avoidance response at 7 weeks of age.
- A significant decrease in brain weight was observed in offspring prenatally treated with PCP.
Conclusions:
- Prenatal administration of phencyclidine (PCP) impairs learning and memory processes in rat offspring, affecting both passive and active avoidance tasks.
- Developmental toxicity of PCP, even at doses below malformation levels, warrants significant attention.
- These findings highlight the potential long-term cognitive consequences of prenatal exposure to PCP.
Abstract:
The effects of prenatal administration of phencyclidine (PCP) on the learning and memory processes of rat offspring were investigated at doses below the level for producing malformations. The offspring prenatally treated with PCP (10 or 20 mg/kg) on days 7 to 17, as well as on days 7 to 21 of gestation, showed disruption of the acquisition of passive avoidance response and pole-climbing avoidance response at the ages of 4 and 7 weeks, respectively. The brain weight of the offspring prenatally treated with PCP was significantly decreased. These results suggest that prenatal PCP administration impairs learning and memory processes of passive and active avoidance tasks and that more attention should be given to the developmental toxicity of PCP.