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Decrease of sexual receptivity by prolylendopeptidase inhibitor in female rats
1Department of Basic Human Sciences, School of Human Sciences, Waseda University, Tokorozawa, Saitama, Japan.
Japanese Journal of Pharmacology
|July 11, 2000
Summary
The prolylendopeptidase inhibitor Z-321 suppressed lordosis behavior in hormone-treated rats. This suggests a role for proline-containing peptides in regulating sexual receptivity.
Area of Science:
- Neuroendocrinology
- Behavioral Neuroscience
- Pharmacology
Background:
- Lordosis behavior in female rodents is a key indicator of sexual receptivity, modulated by ovarian hormones.
- Prolyl endopeptidases and their substrates are implicated in various neural processes, potentially including reproductive behaviors.
Purpose of the Study:
- To investigate the effects of a specific prolylendopeptidase inhibitor, Z-321, on lordosis behavior in estrogen and progesterone-treated ovariectomized rats.
- To explore the potential involvement of proline-containing peptide neurotransmitters in the inhibition of lordosis.
Main Methods:
- Ovariectomized rats were treated with estrogen and progesterone to induce sexual receptivity.
- Rats were orally administered varying doses of Z-321 (100, 200, or 300 mg/kg) or a vehicle control.
- Lordosis behavior was quantified using the lordosis quotient.
Main Results:
- A significant suppression of lordosis behavior was observed in rats treated with 300 mg/kg of Z-321 compared to the control group.
- Lower doses of Z-321 (100 and 200 mg/kg) did not significantly affect lordosis behavior.
- The results indicate a dose-dependent inhibitory effect of Z-321 on lordosis.
Conclusions:
- Z-321, a prolylendopeptidase inhibitor, effectively suppresses lordosis behavior in hormonally primed ovariectomized rats.
- These findings support the hypothesis that proline-containing peptide neurotransmitters may play a role in the neural mechanisms inhibiting lordosis behavior.