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Perinatal treatment with picrotoxin induces sexual, behavioral, and neuroendocrine changes in male rats
M R Silva1, C A Oliveira, L F Felicio
1Departamento de Farmacologia do Instituto de Ciências Biomédicas, São Paulo, SP, Brasil.
Insights
Maternal exposure to picrotoxin (PT) during development alters male rat sexual behavior and physiology. This neurotoxin exposure during critical brain differentiation periods leads to lasting reproductive changes in male offspring.
Area of Science:
- Neuroscience
- Reproductive Biology
- Developmental Toxicology
Background:
- Prenatal and postnatal development are critical periods for sexual brain differentiation.
- Environmental factors can disrupt normal neurodevelopmental processes.
- Picrotoxin (PT) is a known neurotoxin affecting GABAergic neurotransmission.
Purpose of the Study:
- To investigate the long-term effects of maternal picrotoxin (PT) exposure on male offspring.
- To assess behavioral, physical, and neurochemical changes related to sexual differentiation.
- To determine if perinatal PT exposure impacts reproductive physiology and behavior in adult male rats.
Main Methods:
- Maternal rats were exposed to picrotoxin (PT) during prenatal and postnatal development.
- Offspring underwent behavioral testing for sexual behavior.
- Physical parameters (sexual maturation, body/organ weights) and neurochemical levels (monoamines and metabolites) were analyzed.
Main Results:
- Sexual maturation and testis weight remained unchanged in PT-exposed offspring.
- Male offspring exhibited decreased sexual behavior, body weight, reproductive organ weights, and plasma testosterone levels.
- Striatal dopamine (DA) and homovanillic acid (HVA) levels decreased, while hypothalamic norepinephrine (NE) levels increased.
Conclusions:
- Perinatal picrotoxin (PT) exposure during critical male brain sexual differentiation periods causes significant long-term effects.
- These effects include altered sexual behavior and reproductive physiology in male rats.
- Neurochemical changes in dopamine and norepinephrine pathways are associated with these observed deficits.
Abstract:
The effects of maternal exposure to picrotoxin (PT) during the prenatal and postnatal periods of sexual brain differentiation were studied. Behavioral (sexual behavior), physical (sexual maturation, body, and organ weights) and neurochemical (striatal and hypothalamic monoamine and respective metabolite levels) data were assessed in the offspring of PT-treated dams. The following results were obtained: 1) sexual maturation as measured by the day of testis descent and testis weight comparison was unchanged; 2) a decrease in male sexual behavior occurred, as well as a decrease in body, ductus deferens, and seminal vesicle weights and in plasma testosterone levels of adult male offspring; 3) striatal dopamine (DA) and homovanillic acid (HVA) levels were decreased and hypothalamic norepinephrine (NE) levels were increased. These results indicate that perinatal exposure to PT during the critical periods of male brain sexual differentiation has long-term effects on the reproductive physiology and behavior of male rats.