Analysis of social interaction and proximity preferences in mice exposed to valproic acid prenatally.

Researchers studied mice whose mothers received valproic acid (a seizure medication) during pregnancy, which is known to increase autism risk. Using a tracking system, they found these mice had fewer social interactions and spent less time at a distance from other mice, even though they moved around normally. This suggests the prenatal medication exposure affected social behavior in ways similar to autism characteristics.

This study examined social behavior in male mice exposed to valproic acid (VPA) during prenatal development, using a multi-animal positioning system to track interactions. Prenatal VPA exposure, known to increase autism spectrum disorder risk, resulted in reduced frequency, duration, and number of social contacts compared to control mice. While inter-individual distance remained unchanged, VPA-exposed mice spent less time at distance from others, suggesting altered social proximity preferences. The mice showed no changes in general locomotion or psychomotor activity, but demonstrated a paradoxical pattern of increased social proximity combined with decreased actual social interaction.

These findings provide insights into behavioral consequences of altered neurodevelopment and support further mechanistic research.

Findings support caution regarding VPA use during pregnancy and provide insights into potential social behavioral mechanisms in autism. The paradoxical proximity-interaction pattern may inform understanding of social difficulties in autism spectrum disorders and guide development of targeted interventions.

Sample size not reported, limiting assessment of statistical power. Single study design without replication. Animal model findings may not directly translate to human autism. Gender-specific effects unclear as only male mice studied. Mechanisms underlying behavioral changes not investigated.

It is established that exposure to the antiepileptic drug valproic acid (VPA) during the prenatal period increases the risk of neurodevelopmental disorders, including autism spectrum disorders (ASD). In this study, a multi-animal positioning system (MAPS) was utilized to ICR male mice as control (CT) and prenatal VPA-treated male mice in a shared environment, with the objective of investigating the effects of VPA on social interaction and social proximity. The results of the behavioral analysis indicated that the frequency, duration, and number of contacts were reduced in mice treated with VPA compared to the control group. Additionally, while there was no effect on inter-individual distance, the time spent at a distance was reduced.

While no effects were observed on spontaneous locomotion or psychomotor activity, mice treated with VPA demonstrated behavioral abnormalities, characterized by increased social proximity but decreased social interaction. This finding underscores the utility of the MAPS in assessing natural group behavior and highlights the main behavioral differences associated with autism spectrum disorders due to prenatal VPA exposure. The results of this study offer valuable insights into the behavioral consequences of altered neurodevelopment and encourage further research to elucidate the underlying mechanisms.