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Prenatal treatment with clomipramine has an anxiolytic profile in the adolescent rat
Insights
Prenatal exposure to the antidepressant clomipramine in rats led to adolescent anxiety-reducing effects and altered exploration behaviors. These effects did not persist into adulthood, suggesting potential developmental impacts.
Area of Science:
- Neuroscience
- Developmental Psychology
- Pharmacology
Background:
- Prenatal exposure to certain medications can impact offspring neurodevelopment and behavior.
- Tricyclic antidepressants (TCAs) are commonly prescribed, necessitating understanding of their developmental effects.
- Previous research indicates imipramine's prenatal exposure affects offspring behavior.
Purpose of the Study:
- To investigate the long-term behavioral effects of prenatal clomipramine exposure in male rat offspring.
- To assess anxiety-like behaviors and habituation in offspring exposed to clomipramine during gestation.
- To determine if behavioral changes observed in adolescence persist into adulthood.
Main Methods:
- Pregnant rats received clomipramine (3, 10, or 30 mg/kg/day) from gestational days 8-21.
- Male pups were cross-fostered and raised in standardized litters.
- Offspring underwent behavioral testing during adolescence and adulthood, including exploration and social interaction tests.
Main Results:
- Prenatal clomipramine exposure resulted in decreased rearing and accelerated habituation to novel environments in offspring.
- Adolescent offspring exhibited an anxiolytic profile in the Social Interaction test.
- Observed behavioral effects were not evident in adulthood, potentially due to repeated testing or developmental resilience.
Conclusions:
- Prenatal clomipramine exposure induces transient behavioral alterations in male rat offspring, including anxiolytic effects during adolescence.
- The study highlights the importance of considering developmental timing and environmental factors in assessing drug effects.
- Further research is needed to elucidate the mechanisms underlying these transient effects and their long-term implications.
Abstract:
The tricyclic anti-depressant clomipramine (3, 10 or 30 mg/kg/day) was administered to pregnant rats between days 8 and 21 of gestation. Male pups were cross-fostered at birth and raised in litters of eight. After weaning (postnatal day 21) the offspring were raised in an enriched environment and were then subjected to a variety of behavioral tests, lasting through adolescence (days 35 to 42), and repeated in adulthood (day 70 onwards). As has been found when imipramine was administered prenatally, the offspring showed decreased rearing and less exploration; however, the latter was entirely due to more rapid habituation to the test environment. The treatment produced an anxiolytic profile when the adolescents were tested in the Social Interaction test of anxiety. Effects did not persist into adulthood, although it may be that this was the result of repeated testing.