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22 June 2011 Quantitative Investigations on the Effects of Exposure Durations to the Combined Cryoprotective Agents on Mouse Oocyte Vitrification Procedures
Liang Wang, Jun Liu, Guang-Bin Zhou, Yun-Peng Hou, Jun-Jie Li, Shi-En Zhu
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Abstract

Vitrification by using two-step exposures to combined cryoprotective agents (CPAs) has become one of the most common methods for oocyte cryopreservation. By quantitatively examining the status of oocytes during CPA additions and dilutions, we can analyze the degree of the associated osmotic damages. The osmotic responses of mouse MII oocyte in the presence of the combined CPAs (ethylene glycol, EG, and dimethyl sulfoxide, DMSO) were recorded and analyzed. A two-parameter model was used in the curve-fitting calculation to determine the values of hydraulic conductivity (Lp) and permeability (Ps) to the combined CPAs at 25°C and 37°C. The effects of exposure durations and the exposure temperatures on the cryopreservation in terms of frozen-thawed cell survival rates and subsequent development were examined in a series of cryopreservation experiments. Mouse MII oocytes were exposed to pretreatment solution (PTS) and vitrification solution (VS) at specific temperatures. The PTS used in our experiment was 10% EG and 10% DMSO dissolved in modified PBS (mPBS), and the VS was EDFS30 (15% EG, 15% DMSO, 3 × 10−3 M Ficoll, and 0.35 M sucrose in mPBS).The accumulative osmotic damage (AOD) and intracellular CPA concentrations were calculated under the different cryopreservation conditions, and for the first time, the quantitative interactions between survival rates, subsequent development rates, and values of AOD were investigated.

Liang Wang, Jun Liu, Guang-Bin Zhou, Yun-Peng Hou, Jun-Jie Li, and Shi-En Zhu "Quantitative Investigations on the Effects of Exposure Durations to the Combined Cryoprotective Agents on Mouse Oocyte Vitrification Procedures," Biology of Reproduction 85(5), 884-894, (22 June 2011). https://doi.org/10.1095/biolreprod.110.090118
Received: 2 December 2010; Accepted: 1 June 2011; Published: 22 June 2011
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KEYWORDS
assisted reproductive technology
fertilization
gamete biology
in vitro fertilization (IVF)
oocyte development
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