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Reproductive experience modulates dopamine-related behavioral responses.
E E Hucke1, P E Cruz-Casallas, L H Sider
1Departamento de Patologia, Faculdade de Medicina Veterinária, Universidade de São Paulo, Av. Prof. Orlando Marques Paiva, 87, Cidade Universitária, CEP 05508-970, São Paulo, Brazil.
Pharmacology, Biochemistry, and Behavior
|April 28, 2001
Summary
Reproductive experience (RE) alters dopamine-related behaviors in female rats. These changes include modified responses to amphetamine and apomorphine, suggesting long-term physiological effects of reproduction.
Area of Science:
- Neuroscience
- Reproductive Biology
- Behavioral Pharmacology
Background:
- Reproductive experience (RE) encompasses mating, pregnancy, parturition, and lactation, known to induce lasting physiological changes.
- RE is associated with reduced prolactin levels and altered neurochemical responses to dopamine receptor antagonists in humans and rats.
Purpose of the Study:
- To investigate the impact of reproductive experience (RE) on dopaminergic-related behaviors in female rats.
- To assess how RE influences responses to novel environments, amphetamine (AMPH) withdrawal, and stereotypy induced by AMPH and apomorphine (APO).
Main Methods:
- Evaluated locomotor activity in an open-field test following RE.
- Assessed behavioral changes after amphetamine (AMPH) pretreatment and short-term withdrawal.
- Measured stereotyped behaviors induced by AMPH and apomorphine (APO), and APO-induced hypothermia.
Main Results:
- Reproductive experience (RE) led to decreased locomotor activity in the open-field test.
- Apomorphine (APO)-induced stereotyped behavior was slightly more pronounced in primiparous animals.
- No significant differences in AMPH-induced stereotypy or APO-induced hypothermia were observed between groups.
Conclusions:
- Reproductive experience (RE) demonstrably modifies specific dopaminergic-related behavioral responses in female rats.
- The findings suggest significant long-term physiological adaptations in the dopaminergic system following reproductive events.