Effects of Delta-sleep-inducing, Kisspeptin-10 and pt-141 Neuropeptides on Sexual Behaviour in Male Rats

The work presents a comparative assessment of the effects of delta-sleep-inducing peptide (DSIP), kiss-peptin-10 and PT-141 neuropeptides on the copulatory behaviour in male rats with natural sexual activity.

A single intraperitoneal injection of DSIP (1 mg/kg) promotes the motivational and copulatory components of sexual male rat behaviour in courtship of a receptive female. The neuropeptide application significantly boosts sexual activity in males, rises the copulation rate, mean number of ejaculations towards sexual exhaustion and reduces rest periods in animals. Kisspeptin-10 (1 mg/kg) promotes high arousal in the middle (increased copulation rate in copulatory series 6) and end of the courtship cycle (increased ratio of sexually active males in copulatory series 8-9). PT-141 (0.13 mg/kg) facilitates sexual activity in male rats only in the onset and middle of the courtship cycle. The transience of DSIP and PT-141 stimulating effect warrants adjustments in the neuropeptide dosage and application regimens.

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