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Fucoidin binding activity and its localization on human spermatozoa
M C Mahony1, G F Clark, S Oehninger
1Jones Institute for Reproductive Medicine, Department of Obstetrics and Gynecology, Eastern Virginia Medical School, Norfolk 23507.
Contraception
|September 1, 1993
Summary
Fucoidin, a sulfated polymer, binds to a compound within the human sperm
Area of Science:
- Reproductive Biology
- Biochemistry
- Sperm-Zona Pellucida Interaction
Background:
- Fucoidin inhibits human sperm binding to the zona pellucida and acrosome reaction.
- Understanding fucoidin's binding site on sperm is crucial for reproductive research.
Purpose of the Study:
- To determine fucoidin binding activity and localization on human spermatozoa.
- To investigate the nature of the fucoidin binding site.
Main Methods:
- Binding assays with biotinylated fucoidin.
- Competitive inhibition assays using unlabeled fucoidin and sperm extracts.
- Localization studies on live and permeabilized sperm.
- Analysis of binding after calcium ionophore treatment.
Main Results:
- Fucoidin demonstrated a typical binding curve with human sperm.
- Binding was localized to the acrosomal region of fixed sperm.
- Binding significantly decreased after acrosome reaction induction.
- Minimal binding occurred on live sperm, but increased significantly after detergent permeabilization.
Conclusions:
- A fucoidin-binding compound exists in human spermatozoa, localized to the acrosomal region.
- This binding site appears accessible after sperm membrane permeabilization, suggesting an internal location.
- Further research is needed to clarify if binding sites exist on both the sperm surface and within the acrosomal matrix.