¹Memorial University of Newfoundland, Psychology, St. John's, Canada, ²University of Tours, Neuroscience, Tours, France

Background: Effectively treating schizophrenia remains a significant challenge, particularly in addressing the full spectrum of symptoms following the initial onset. Current interventions often focus on individuals at high risk of developing the disorder, leading researchers to employ animal models to test potential treatments and identify relevant biomarkers. Evidence suggests that stress during the critical transition to adulthood may exacerbate psychotic symptoms in high-risk populations. In animal studies, this phenomenon is often modelled through prenatal immune activation.

Aims & Objectives: This study explores the impact of maternal immune activation (MIA) on maternal and offspring behavior, with an emphasis on identifying early markers of prodromal schizophrenia during adolescence.

Method: To simulate maternal immune responses during pregnancy, lipopolysaccharide (LPS) was administered prenatally, and the offspring were further subjected to hypothalamic-pituitary-adrenal (HPA) axis activation during adolescence. Behavioral assessments included the social interaction test, the novel object recognition test, and the open field test, which were applied to post-gestation mothers and their juvenile offspring. Electroencephalographic (EEG) recordings were also conducted to measure evoked response potential (ERP) using the negativity mismatch paradigm.

Results: The results highlighted notable sex-specific effects. Male offspring exposed to LPS exhibited reduced social engagement and impaired cognitive performance, whereas female offspring showed altered social behavior and heightened anxiety-like tendencies. Additionally, LPS-exposed dams demonstrated changes in their own social and cognitive behaviors. ERP recordings revealed marked deficits in MIA-exposed animals. Further analysis of correlations between maternal and offspring behaviors are under way.

Discussion & Conclusions: This research sheds light on behavioral changes that may signal the early stages of schizophrenia and underscores the importance of both maternal and offspring factors in understanding the disorder's development. By identifying these early behavioral markers, the study provides a foundation for future research aimed at developing effective prevention strategies.