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Related Experiment Videos

Is the activated spermatozoon really capacitated?

C Barros, M Berrios

    The Journal of Experimental Zoology
    |July 1, 1977
    PubMed
    Summary

    This study shows that hamster sperm activation occurs separately from the acrosome reaction in a salt-based medium. Activated sperm bind to oocytes but cannot fertilize them, indicating activation does not equal capacitation.

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    Area of Science:

    • Reproductive Biology
    • Sperm Physiology
    • Cellular Biology

    Background:

    • Sperm capacitation and acrosome reaction are critical for fertilization.
    • Understanding the sequential events of sperm activation is essential for reproductive research.
    • The role of specific media components in modulating these processes requires further investigation.

    Purpose of the Study:

    • To investigate the effects of a simple salt-based medium (7M) on golden hamster sperm survival, activation, and acrosome reaction.
    • To determine if sperm activation in this medium leads to functional capacitation and fertilization capability.

    Main Methods:

    • Golden hamster spermatozoa were incubated in a salt-only medium (7M) at 37°C.
    • Sperm survival, activation, and acrosome reaction rates were assessed over time.
    • Activated spermatozoa were co-incubated with zona-free hamster oocytes, and interactions were examined via electron microscopy.

    Main Results:

    • Medium 7M supported sperm survival and allowed temporal separation of activation and acrosome reaction.
    • Over 70% of spermatozoa were activated within 4 hours, while the acrosome reaction remained low (8%).
    • Activated sperm bound to oocytes but did not fuse, and oocytes phagocytosed sperm, indicating a lack of fertilization.

    Conclusions:

    • Sperm activation in the salt-based medium 7M is distinct from the acrosome reaction.
    • Activated spermatozoa in this medium are not capacitated, as evidenced by their inability to fertilize oocytes.
    • This study highlights the complexity of sperm maturation and the specific requirements for achieving fertilization competence.

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