Early Reactions of the Rodent Egg to Spermatozoon Penetration

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Abstract
In the rat, mouse and hamster the spermatozoon passes rapidly through the thick, homogeneous zona pellucida surrounding the egg and the head almost immediately becomes attached to the surface of the inner cytoplasmic mass or vitellus. As a result of this attachment a block to polyspermy is developed in rat and mouse eggs. In the hamster a block is apparently not formed. It seems likely, therefore, that the disappearance of cortical granules in the hamster egg, also an outcome of contact with the spermatozoon head, could signal the release of an agent that is responsible, after crossing the perivitelline space, for bringing about the zona reaction, reducing the penetrability of the zona pellucida to spermatozoa. Data suggest that this mechanism exists also in rats and mice, although a cortical granule response has not been distinguished in these animals. Thus, attachment of the spermatozoon head to the vitellus probably elicits both the zona reaction and the block to polyspermy. These changes appear to be specific to spermatozoon penetration and to be initiated before the spermatozoon head passes through the surface of the vitellus and before the resumption of the second meiosis.