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Monoamines and sexual behaviour in non-human primates
Ciba Foundation Symposium
|March 14, 1978
Summary
Monoamines significantly influence rhesus monkey sexual behavior. Serotonin depletion and uptake inhibition altered proceptivity, while dopamine and beta-blockers showed specific effects, highlighting the role of neuropharmacology in understanding these behaviors.
Area of Science:
- Neuroscience
- Behavioral Endocrinology
- Psychopharmacology
Background:
- Monoamines, including serotonin and dopamine, are implicated in regulating sexual behavior.
- Hormonal influences on sexual behavior in rhesus monkeys are complex and interact with neurotransmitter systems.
- Previous studies have not fully elucidated the intricate relationship between hormones and monoamines in sexual function.
Purpose of the Study:
- To investigate the role of monoamines in the sexual behavior of rhesus monkeys.
- To explore the interaction between hormonal manipulations and monoamine systems in modulating sexual proceptivity and receptivity.
- To assess the impact of psychoactive drugs on sexual activity and related endocrine measures.
Main Methods:
- Measurement of monoamine metabolite levels in cerebrospinal fluid following hormonal changes.
- Administration of psychoactive drugs, including serotonin depletors (p-chlorophenylalanine) and uptake inhibitors (chlorimipramine).
- Use of dopamine agonists (alpha-bromocriptine) and beta-blockers (oxprenolol) to study their effects on sexual behavior and endocrine parameters.
- Controlled behavioral and endocrine experiments in rhesus monkeys.
Main Results:
- Serotonin depletion reversed decreased proceptivity after adrenalectomy; serotonin uptake inhibition significantly reduced proceptivity and receptivity.
- Low doses of alpha-bromocriptine enhanced female proceptivity, independent of prolactin suppression.
- Oxprenolol improved male sexual performance, suggesting a potential anxiolytic effect, though endocrine measures were inconclusive.
Conclusions:
- Serotoninergic neurons play a crucial role in controlling sexual behavior in rhesus monkeys.
- Dopaminergic pathways and potential anxiolytic mechanisms may also modulate sexual activity.
- Precise neuroanatomical and neuropharmacological techniques, alongside systemic drug administration, are vital for investigating the neural mechanisms underlying sexual behavior.