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Inhibition of hamster sperm acrosomal enzyme by gossypol is closely associated with the decrease in fertilization
1Department of Biochemistry and Molecular Biology, University of Georgia, Athens, GA 30620, USA.
Contraception
|January 4, 2001
Summary
Gossypol causes infertility by inhibiting key sperm enzymes, acrosin and arylsulfatase. Measuring these enzyme activities can help monitor gossypol-induced sterility.
Area of Science:
- Reproductive Biology
- Biochemistry
- Toxicology
Background:
- Gossypol is known to induce male sterility.
- The precise mechanism of gossypol-induced infertility requires elucidation.
- Acrosomal enzymes play a crucial role in fertilization.
Purpose of the Study:
- To investigate the mechanism by which gossypol induces sterility.
- To determine the relationship between gossypol exposure, acrosomal enzyme activity, and fertilizing capacity.
Main Methods:
- In vitro exposure of hamster spermatozoa to varying concentrations of gossypol.
- In vivo administration of gossypol to hamsters for 6 weeks.
- Assessment of sperm motility, hyperactivated motility (HAM), penetration into cervical mucus, and in vitro fertilization rates.
- Measurement of acrosomal enzyme activities, including hyaluronidase, acrosin, and arylsulfatase.
Main Results:
- Gossypol significantly inhibited sperm penetration into cervical mucus, HAM, and in vivo fertility.
- In vitro fertilization rates and sperm motility were decreased after chronic gossypol administration.
- Gossypol markedly inhibited acrosin and arylsulfatase activities, suggesting their role in the observed infertility.
- Inhibition of enzyme activity was dose- and duration-dependent.
Conclusions:
- The primary mechanism of gossypol-induced infertility involves the inhibition of acrosin and arylsulfatase activities.
- Assessing acrosin and arylsulfatase activity can serve as a biomarker for monitoring gossypol-induced sterility.