Perinatal diazepam exposure: behavioral and neurochemical consequences

Area of Science:

• Neuroscience
• Developmental Toxicology
• Pharmacology

Background:

• Perinatal exposure to certain medications can impact offspring neurodevelopment.
• Benzodiazepines, like diazepam (DZP), are commonly prescribed but their developmental effects require thorough investigation.

Purpose of the Study:

• To investigate the behavioral and neurochemical effects of perinatal diazepam exposure in F344 rat offspring.
• To determine if gestational and/or postnatal diazepam exposure alters benzodiazepine binding site characteristics.

Main Methods:

• Pregnant rats received diazepam (3-10 mg/kg) or vehicle during late gestation and/or early lactation.
• Offspring behavior was assessed using active and passive avoidance tasks postweaning.
• Benzodiazepine binding assays were performed on cortical membranes.

Main Results:

• Perinatal diazepam exposure significantly affected active avoidance behavior acquisition and extinction.
• No significant effects were observed on passive avoidance learning or memory.
• Benzodiazepine binding affinity and GABA potentiation of 3H-flunitrazepam binding were altered, but binding site density remained unchanged.

Conclusions:

• Perinatal diazepam exposure acts as a behavioral teratogen, impacting specific learning and memory processes.
• Neurochemical alterations in benzodiazepine receptor function occur following perinatal diazepam exposure.
• These findings highlight the potential for lasting neurodevelopmental consequences of in-utero and early-life benzodiazepine exposure.