Journal of Andrology
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Journal of Andrology, Vol 3, Issue 6 420-428, Copyright © 1982 by The American Society of Andrology

Transformations of Sperm Nuclei Incorporated Into Aged and Unaged Hamster Eggs

FRANK J. LONGO 1 AND FREDERICK SO 1

1 Department of Anatomy, University of Iowa, Iowa City, Iowa

The extent of male pronuclear development in aged and unaged hamster eggs was examined by electron microscopy. Observations are presented demonstrating that although hamster eggs, aged 18 hours in vivo and lacking zonae pellucidae, may be fertilized in vitro, transformation of incorporated sperm nuclei into male pronuclei is significantly retarded. By 6 hours postinsemination, 50% of the sperm nuclei incorporated into aged eggs failed to disperse (vs. 19% in unaged eggs); sperm were observed in various stages of dispersion (20%), but only 30% developed into pronuclei (vs. 18 and 63% in unaged eggs, respectively). These results are discussed in reference to concepts of nucleocytoplasmic interactions involving male pronuclear development.

     Key words: pronuclear development, aged and unaged ova

Accepted on June 1, 1982






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Copyright © 1982 by The American Society of Andrology.