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Hum. Reprod. Advance Access published online on August 12, 2006
Human Reproduction, doi:10.1093/humrep/del319
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© The Author 2006. Published by Oxford University Press on behalf of the European Society of Human Reproduction and Embryology. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org
Received May 16, 2006
Revised July 6, 2006
Accepted July 11, 2006

Article

1,2-propanediol and the type of cryopreservation procedure adversely affect mouse oocyte physiology

M.G. Larman 1, M.G. Katz-Jaffe 1, C.B. Sheehan 1, and D.K. Gardner 1 *

1 Colorado Center for Reproductive Medicine, Englewood, CO, USA

* To whom correspondence should be addressed.
D.K. Gardner, E-mail: dgardner{at}colocrm.com


  Abstract

BACKGROUND: The aim of this work was to examine the effect of 1,2-propanediol (PrOH) and type of cryopreservation procedure (slow freezing and vitrification) on oocyte physiology. METHODS: Intracellular calcium of mouse metaphase II (MII) oocytes was quantified by fluorescence microscopy. The effect of PrOH on cell physiology was further assessed through analysis of zona pellucida hardening and cellular integrity. Protein profiles of cryopreserved oocytes were generated by time-of-flight mass spectrometry (TOF-MS). RESULTS: PrOH caused a protracted increase in calcium, which was sufficient to induce zona pellucida hardening and cellular degeneration. Using ‘nominally calcium free’ media during PrOH exposure significantly reduced the detrimental effects. Proteomic analysis identified numerous up- and down-regulated proteins after slow freezing when compared with control and vitrified oocytes. CONCLUSIONS: Using such approaches to assess effects on cellular physiology is fundamental to improving assisted reproduction techniques (ART). This study demonstrates that PrOH causes a significant rise in intracellular calcium. Using calcium-free media significantly reduced the increase in calcium and the associated detrimental physiological effects, suggesting that calcium-free media should be used with PrOH. In addition, analysis of the oocyte proteome following cryopreservation revealed that slow freezing has a significant effect on protein expression. In contrast, vitrification had a minimal impact, indicating that it has a fundamental advantage for the cryopreservation of oocytes.

Keywords: calcium/cryoprotectant/oocyte/proteome/slow freezing.
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