Effects of injecting calcium chloride into in vitro-matured porcine oocytes

Z. Macháty, H. Funahashi, M. A. Mayes, B. N. Day, R. S. Prather

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47 Citations (Scopus)


In vitro-matured porcine oocytes were given injections of 0.1 M CaCl2 and after 6 h evaluated for signs of early and late activation events. CaCl2 injection caused cortical granule exocytosis in 75% (3 of 4) of the oocytes tested. It also induced cell cycle resumption as monitored by the histone H1 kinase assay: the phosphorylation rate of histone H1 decreased to 36.7% of the original value. Treated oocytes completed meiosis, extruded the second polar body, and progressed to first interphase: 79.4% of them formed one or more pronuclei. The elevated intracellular Ca2+ level resulted in activation-related changes in the protein synthetic profile in 90% (9 of 10) of the oocytes. Furthermore, 14.7% (9 of 61) of the treated oocytes developed to the compact morula/early blastocyst stage after a 7-day culture in ligated porcine oviduct, and one blastocyst hatched from the zona pellucida. Control oocytes given injections of 0.1 M MgCl2 or carrier medium (10 mM Hepes) did not show the changes mentioned. The results strengthen the idea that Ca2+ is a cell messenger that plays a central part in oocyte activation; it is concluded that elevated intracellular Ca2+ level caused by a single injection of CaCl2 leads to both early and late events of porcine oocyte activation.

Original languageEnglish
Pages (from-to)316-322
Number of pages7
JournalBiology of reproduction
Issue number2
Publication statusPublished - Feb 1996
Externally publishedYes

ASJC Scopus subject areas

  • Reproductive Medicine
  • Cell Biology


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