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Anandamide transforms noncopulating rats into sexually active animals.

Ana Canseco-Alba¹, Gabriela Rodríguez-Manzo

¹Departamento de Farmacobiología, Cinvestav-Sede Sur, México DF, Mexico.

The Journal of Sexual Medicine

|August 22, 2012

Summary

The endocannabinoid anandamide restored sexual behavior in 50% of noncopulating male rats, demonstrating a long-lasting effect. This suggests the endocannabinoid system regulates male sexual activity and that varied mechanisms cause sexual inhibition.

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Area of Science:

Neuroscience
Endocrinology
Animal Behavior

Background:

Noncopulating (NC) male rats exhibit normal health but fail to engage in mating behaviors.
Evidence suggests endogenous opioids contribute to the sexual inhibitory state in NC rats.
Endocannabinoids, like anandamide, are neuromodulators influencing neurotransmitter release.

Purpose of the Study:

To determine if anandamide can induce sexual behavior expression in male rats classified as noncopulators.

Main Methods:

NC male rats received intraperitoneal injections of anandamide or a vehicle control.
Copulatory behavior was assessed over 120 minutes, followed by a second test after 14 days.
Quantified sexual responses included mounts, intromissions, ejaculation, and resumption of behavior.

Main Results:

Anandamide induced sexual behavior in 50% of previously NC rats; vehicle-injected rats showed no sexual behavior.
Anandamide-treated rats exhibited multiple ejaculatory series and sustained sexual activity for at least 14 days.
Initial copulation in responding rats involved numerous mounts and intromissions, with increased latencies compared to sexually naive rats.

Conclusions:

Anandamide administration effectively transforms NC rats into sexually active individuals with sustained sexual behavior.
The partial response to anandamide suggests diverse underlying mechanisms for sexual inhibition in NC rats.
The endocannabinoid system plays a significant role in regulating the expression of male rat sexual behavior.