Perinatal fluoxetine exposure does not impair cognition in offspring

Area of Science:

• Neuroscience
• Developmental Psychology
• Pharmacology

Background:

• Selective serotonin reuptake inhibitors (SSRIs) are commonly prescribed for depression during pregnancy.
• The long-term behavioral and cognitive effects of prenatal SSRI exposure on both mothers and offspring are not fully understood.
• The influence of maternal care, potentially altered by serotonin levels, is an understudied factor in offspring development.

Purpose of the Study:

• To investigate the long-term effects of perinatal fluoxetine (FLX) exposure on the cognitive performance of Wistar rats (dams and offspring).
• To assess the impact of FLX on maternal care behaviors.
• To examine potential sex-specific cognitive differences in offspring exposed to FLX during development.

Main Methods:

• Female Wistar rats were administered daily fluoxetine (FLX) or vehicle (VEH) throughout gestation and lactation.
• Maternal spatial memory was tested pre-pregnancy and post-weaning.
• Offspring (male and female) underwent assessments for spatial working memory, short- and long-term spatial memory, and social recognition.

Main Results:

• FLX-treated dams exhibited increased nesting behavior.
• Neither dams nor offspring could reliably perform novel object location tests, precluding conclusions on this specific memory type.
• Perinatal FLX exposure did not significantly alter offspring spatial working memory or social recognition.
• Female offspring displayed enhanced cognitive flexibility but diminished social recognition compared to males, irrespective of treatment.

Conclusions:

• Perinatal exposure to fluoxetine influences maternal care patterns in rats.
• Despite effects on maternal behavior, FLX exposure during pregnancy and lactation has a limited impact on the overall cognitive functions of the offspring.
• Observed sex-specific cognitive differences in offspring highlight the complexity of developmental neurobiological responses.