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Ultrasonic vocalization in rat pups: effects of early postnatal exposure to haloperidol
Insights
Neonatal exposure to haloperidol (H) significantly alters rat pup ultrasonic vocalizations, reducing call numbers but increasing duration. These changes suggest early neurodevelopmental impacts on the dopaminergic system.
Area of Science:
- Neuroscience
- Developmental Psychology
- Pharmacology
Background:
- Postnatal development is crucial for neurobiological maturation.
- The dopaminergic system plays a key role in neurodevelopment and behavior.
- Ultrasonic vocalizations (USVs) in rat pups are sensitive indicators of distress and neurodevelopmental status.
Purpose of the Study:
- To investigate the effects of prolonged postnatal haloperidol (H) administration on rat pup ultrasonic vocalization (USV).
- To assess whether USVs can serve as an early indicator of neurodevelopmental changes induced by dopamine receptor blockade.
Main Methods:
- Rat pups were administered haloperidol (H) postnatally.
- Ultrasonic vocalizations (USVs) were elicited by nest removal.
- Acoustic parameters of USVs, including number, duration, and frequency, were analyzed.
Main Results:
- Haloperidol (H) exposure significantly reduced the number of ultrasonic calls from postnatal days 8-14.
- Haloperidol (H) significantly increased the duration of ultrasonic calls from postnatal days 4-16.
- Early postnatal haloperidol (H) treatment altered the frequency of ultrasonic calls.
Conclusions:
- Neonatal haloperidol (H) exposure impairs the functional maturation of the dopaminergic system.
- Ultrasonic vocalization (USV) is a sensitive early indicator of subtle neurodevelopmental changes caused by dopamine receptor blocking agents.
- USV analysis can detect neurotoxicity at doses below overt clinical signs.
Abstract:
The effects of prolonged postnatal administration of haloperidol (H) on ultrasonic vocalization elicited by the removal of rat pups from their nest were investigated. The results show that the number of ultrasonic calls was significantly reduced by H exposure from the 8th until the 14th day after birth. Conversely, this neuroleptic significantly increased the duration of ultrasound from the 4th up to the 16th day of age. Moreover, changes in the frequency of calls were produced by early postnatal treatment with H. These alterations could be due to an impaired functional maturation of the dopaminergic system produced by neonatal exposure to H. Furthermore, the present data suggest that ultrasonic vocalization may be considered as an early sensitive indicator of subtle changes elicited by the postnatal treatment with a dopamine receptor blocking agent at dose levels below those associated with overt signs of neurotoxicity.