Background:

Z-321 is a prolylendopeptidase (PEP) inhibitor.

Z-321 is a prolylendopeptidase (PEP) inhibitor. In the 100 or 200 mg/kg Z-321-treated groups, mean lordosis quotient (LQ) decreases after administration. However, there is no statistical difference among the values before and after. In contrast, the mean LQ in the 300 mg/kg Z-321-treated females is lower than that before injection (P<0.005). Furthermore, when compare to that in the vehicle-treated control group, mean LQ is also significantly lower (p<0.05). The incidence of soliciting behavior decreases after treatment with 300 mg/kg Z-321, when compare to that before treatment, but there is no statistical difference. The present study also demonstrates that 300 mg/kg Z-321 is effective in inhibiting lordosis behavior without disturbance of locomotor activity[1].

[1]. Oosuka I, et al. Decrease of sexual receptivity by prolylendopeptidase inhibitor in female rats. Jpn J Pharmacol. 2000 May;83(1):82-5.