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Early sperm-egg interaction after sperm microinjection

A H Sathananthan¹, S C Ng, S L Liow

¹Centre for Early Human Development, Monash Medical Centre, Clayton, Vic., Australia.

Reproduction, Fertility, and Development

|January 1, 1994

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Early human sperm-egg interactions were studied after injection into the perivitelline space (PVS) and ooplasm. Sperm acrosome reactions occurred in the PVS, but incorporation into the ooplasm requires further investigation.

Area of Science:

Reproductive Biology
Cell Biology
Human Embryology

Background:

Understanding early sperm-egg interactions is crucial for human reproduction.
Investigating sperm behavior after various insemination methods provides insights into fertilization processes.

Purpose of the Study:

To detail the early events of sperm-egg interaction following sperm injection into the perivitelline space (PVS) and ooplasm.
To analyze sperm acrosome reaction, incorporation, and polyspermy block in human oocytes.

Main Methods:

Observation of sperm-egg interactions 1-3 hours post-injection.
Utilizing multiple sperm injection into the PVS and direct ooplasm injection.
Assessment of sperm acrosome status, ooplasmic incorporation, and oolemma block.

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Main Results:

Sperm acrosome reaction occurred in the PVS, not within the ooplasm.
Sperm incorporation into the ooplasm followed the acrosome reaction in the PVS.
A block to polyspermy was observed at the oolemma.
Sperm were found in oolemma-bound vacuoles and ooplasmic breaches after intracytoplasmic injection.
Abnormal sperm were present despite normal donor semen parameters.

Conclusions:

Sperm acrosome reaction is essential for PVS sperm incorporation but does not occur intracellularly.
Sperm incorporation into the ooplasm requires further detailed investigation.
Intracytoplasmic sperm injection can lead to ooplasmic abnormalities.
Sperm quality assessment remains critical even with normal semen parameters.