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Related Experiment Videos

Interaction between human gametes in vitro: a scanning electron microscopic study.

P Sundström

    Archives of Andrology
    |January 1, 1984
    PubMed
    Summary
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    Human oocytes show varied sperm binding to the zona pellucida, suggesting differences in binding sites. Sperm selection may occur during initial interaction with oocytes and surrounding cumulus corona cells.

    Area of Science:

    • Reproductive Biology
    • Cell Biology
    • Human Gametes

    Background:

    • Understanding sperm-oocyte interactions is crucial for human reproduction.
    • The zona pellucida plays a key role in sperm binding and penetration.
    • Variability in oocyte quality and sperm-binding capacity is recognized.

    Purpose of the Study:

    • To investigate the interaction between human spermatozoa and oocytes using scanning electron microscopy.
    • To assess the number and distribution of spermatozoa on preovulatory and nonovulatory human oocytes.
    • To explore potential mechanisms of sperm selection during fertilization.

    Main Methods:

    • Scanning electron microscopy (SEM) was used to examine 15 human oocytes.
    • Oocytes were incubated with spermatozoa for 24 hours and cultured for 1-3 days.

    Related Experiment Videos

  • Preovulatory and nonovulatory oocytes were analyzed for attached and penetrating spermatozoa.

    • Main Results:

    • Significant variation was observed in the number of spermatozoa attached to the zona pellucida of oocytes.
    • Preovulatory oocytes had fewer attached spermatozoa (few to ~50) compared to nonovulatory oocytes (few to several hundred).
    • Abnormal spermatozoa were rarely seen on oocytes or corona cells, suggesting in vitro selection.

    Conclusions:

    • Human oocytes exhibit differences in sperm-binding sites on the zona pellucida.
    • Sperm selection appears to occur during the initial interaction with oocytes and cumulus corona cells.
    • These findings contribute to understanding early events in human fertilization.