Abstract
Objective To assess the effects of fentanyl (F),alfentanil (A),sufentaril (S),butorphanol (B),dezocine (D) and pentazocine (P) on human sperm motility in vitro.Methods Twenty samples of semen with normal sperm motility were collected.The semen was mixed with HTF liquid culture medium and sperm concentration was adjusted to (40-80) × 106/ml.Then semen suspension 50 μl was added into the culture dishes.The semen suspensions were randomly divided into 3 groups:group Ⅰ control-semen suspension 50 μl + 0.9％ NaCl 50 μl.GroupⅡ single opioid-semen suspension 50 μl + 50 μl of 4 concentrations of F,A,S,B,D and P (10-3,10-4,10-5,10-7 mol/L).Group Ⅲ combined opioid-naloxone-semen suspension 50 μl + 25 μl of 3concentrations of naloxone (2 × 10-8,1 × 10-7,2 × 10-7 mol/L) + 25 μl of 4 concentrations of F,A,S,B and D.After being incubated for 1 h the sperm motility was assessed by sperm analyzer and the amplitude of change in sperm motility was calculated.Median inhibition concentration (IC50) and complete inhibition concentration ( IC100 ) of the 6 opioids were calculated from concentration-response curve.Results ( 1 ) The shape of concentration-response curve for F,A and S was straight line.The maximal decrease in sperm motility was (56 ± 5)％(F),(58±7)％ (A) and(79±:6)％ (S).(2) The shape of concentration-response curve for B,D and P was sigmoid.Low concentrations of B,D and P did not affect sperm motility.Median and high concentrations of B and D could inhibit sperm motility.The maximal inhibition was 100％.High concentration of P increased sperm motility.The maximal increase was (19 ± 6)％.(3) Naloxone shifted the concentration-response curve for F,A,S,B and D to the right,and decreased the maximal inhibitory effect of F,A and S dose-dependently but did not affect the maximal inhibitory effect of B and D.(4) IC50 was in the order of A≈ F ＞ D ＞ S≈- B.IC100 was D ＞ B.Conclusion F,A and S inhibit sperm motility by acting on opioid receptor on human sperms while B and D act through opioid or nonopioid pathways.P can increase sperm motility. Key words: Analgesics,opioid; Sperm motility; In vitro
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