Human Cell

, Volume 17, Issue 4, pp 177–180 | Cite as

Appearance of the oocyte activation ability of mouse round spermatids cultured in Vitro

  • Kahei SatoEmail author
  • Fumi Tanaka
  • Hisataka Hasegawa
Feature…Progress in ART and Future Reproductive Medicine…


This study was undertaken to determine the expression time of fertilization and oocytes activation abilities of spermatids in the mouse. When elongating or elongated spermatids isolated from fresh testes of adult males (B6D2F1) were injected into mature mouse oocytes, both spermatids could activate the mature oocytes and occur fertilization. On the one hand, the round spermatids could not activate mature oocytes, when microinjected into oocytes. In some experiments, recovered round spermatids were cultured under co-culture systems using Sertoli cells as a feeder cell. Under the co-culture system, developed elongating spermatids could stimulate and fertilized mature oocytes. These results indicate that the start of oocyte activation appearance is between the stage of round spermatid and elongating spermatids and the activation ability increases with the advance of spermiogensis. On the other hand, round spermatids isolated from males of ICR strain mouse already have the oocyte activation ability and the fertilizing ability. The result obtained suggests that the expression time of the oocyte activating ability is difficult between the mouse strain.


Sertoli Cell Mature Oocyte Spermatogenic Cell Round Spermatid Epididymal Spermatozoon 
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Copyright information

© Society and Springer Japan 2004

Authors and Affiliations

  1. 1.Division of Cell Biological Science, Graduate School of Bioresource ScienceNihon UniversityKanagawaJapan

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