A modified transmembrane migration method for evaluating the spermicidal potency of some nonoxynol compounds

Area of Science:

• Reproductive biology
• Pharmacology
• In vitro toxicology

Background:

• Human sperm motility is crucial for fertility.
• Assessing drug effects on sperm requires reliable in vitro methods.
• Nonoxynol-9 is a common spermicide, but its potency relative to similar compounds is not fully characterized.

Purpose of the Study:

• To evaluate and modify the transmembrane migration technique for assessing drug effects on sperm motility.
• To compare the spermicidal potency of nonoxynol-9, nonoxynol-5, and nonoxynol-15.

Main Methods:

• Modified the transmembrane migration technique by adding a preincubation step and reducing incubation time to 90 minutes.
• Adjusted the lower reservoir volume to 1 mL for samples with low sperm concentration (<75 x 10^6 spermatozoa/mL).
• Utilized the modified assay to compare the in vitro spermicidal potency of three nonoxynol compounds.

Main Results:

• The modified transmembrane migration technique provides a quantitative assessment of drug effects on sperm motility.
• Nonoxynol-9 and nonoxynol-5 exhibited equivalent spermicidal potency.
• Nonoxynol-15 demonstrated lower spermicidal potency compared to nonoxynol-9 and nonoxynol-5.

Conclusions:

• The modified transmembrane migration technique is a viable method for evaluating spermicidal agents.
• Spermicidal potency of nonoxynol surfactants is influenced by the number of ethylene oxide units.
• Nonoxynol-9 and nonoxynol-5 are more potent spermicides than nonoxynol-15.