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Sex differences in the effects of perinatal anoxia on dopamine function in rats
François Laplante1, Wayne G Brake, Sara L Chehab
1Department of Psychiatry, McGill University, Montreal, Quebec, Canada.
Insights
Perinatal anoxia, or oxygen deprivation, differentially impacts male and female rats long-term. This study reveals sex-specific changes in dopamine systems, potentially explaining gender disparities in neurodevelopmental disorders.
Area of Science:
- Neuroscience
- Developmental Biology
- Psychiatry
Background:
- Birth complications, such as fetal oxygen deprivation (hypoxia), are linked to neurodevelopmental disorders.
- These disorders, including schizophrenia and ADHD, often involve central dopamine (DA) system dysfunction and exhibit gender-specific incidence or severity.
- Understanding the long-term neurological consequences of perinatal hypoxia, particularly sex differences, is crucial for addressing these disorders.
Purpose of the Study:
- To investigate potential sex differences in the long-term effects of perinatal anoxia on central dopamine systems and dopamine-mediated behaviors in adult rats.
- To explore how perinatal hypoxia influences sensorimotor gating and dopamine levels in specific brain regions in a sex-dependent manner.
Main Methods:
- Induction of perinatal anoxia in a rat model.
- Assessment of adult sensorimotor gating using prepulse inhibition (PPI) tests.
- Pharmacological challenge with apomorphine to evaluate dopamine system responsivity.
- Measurement of dopamine and its metabolites in key brain areas, including the prefrontal cortex, nucleus accumbens, and amygdala.
Main Results:
- Perinatal anoxia differentially affected sensorimotor gating (PPI) in adult male and female rats, with impairment primarily observed in males.
- Apomorphine-induced suppression of PPI was significantly more pronounced in anoxic males compared to females.
- While anoxia increased amygdala dopamine levels in both sexes, distinct sex-specific alterations in dopamine and metabolite levels were observed in the prefrontal cortex and nucleus accumbens.
Conclusions:
- Perinatal hypoxia induces long-lasting, sex-specific changes in central dopamine systems and behavior in rats.
- These findings suggest a potential neurobiological basis for the observed gender biases in certain hypoxia-sensitive neurodevelopmental disorders.
- The study highlights the importance of considering sex as a biological variable in research on the developmental origins of neurodevelopmental disorders.
Abstract:
Birth complications involving reduced oxygen to the fetus pose risks for neurodevelopmental disorders like schizophrenia and ADHD, which involve central dopamine (DA) dysfunction and also show gender differences in incidence or severity. Here, we examine possible sex differences in the long-term consequences of perinatal anoxia in the rat, on central DA systems and DA-mediated behaviour. As adults, sensorimotor gating (prepulse inhibition, PPI) was differentially affected by anoxia in males and females, tending to be impaired only in males. Apomorphine-induced suppression of PPI was especially pronounced in males. Anoxia caused increases in amygdala DA levels in both sexes. However, sex-specific changes in DA and metabolite levels in prefrontal cortex and nucleus accumbens were found, suggesting a possible basis for some of the observed gender biases in certain neurodevelopmental disorders, sensitive to birth hypoxia.
