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Fertility Preservation Through Oocyte Vitrification: Clinical and Laboratory Perspectives
08:46

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Published on: September 16, 2021

Theoretic considerations regarding slow cooling and vitrification during cryopreservation.

J Liu1, J Phy, E Yeomans

  • 1Department of Obstetrics and Gynecology, School of Medicine, Health Sciences Center, Texas Tech University, Lubbock, Texas, USA. zensea.liu@ttuhsc.edu

Theriogenology
|July 24, 2012
PubMed
Summary

Theoretical models optimize cryopreservation protocols by simulating cooling profiles and conditions. Careful selection of cell containers and cryoprotective agent (CPA) addition temperatures significantly improves survival rates for rat zygotes.

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Area of Science:

  • Reproductive Biology
  • Biophysics
  • Cryobiology

Background:

  • Cryopreservation is crucial for preserving biological samples like oocytes.
  • Developing effective cryopreservation protocols requires understanding biophysical events and optimizing conditions.
  • Theoretical models offer a framework for designing and refining these protocols.

Purpose of the Study:

  • To present a methodology for developing cryopreservation protocols using theoretical models.
  • To optimize cryopreservation survival by designing specific cooling profiles and selecting external conditions.
  • To investigate vitrification cryopreservation and the impact of cryoprotective agent (CPA) handling.

Main Methods:

  • Utilizing theoretical models and equations to simulate cryopreservation procedures under slow cooling conditions for rat zygotes.
  • Examining biophysical events during cryopreservation and their correlation with cell survival.
  • Conducting experiments to assess the effects of exposure durations and temperatures on cell survival and development rates.
  • Quantitatively evaluating osmotic damage during CPA additions and dilutions.

Main Results:

  • Simulation revealed three distinct regions with specific characteristics relevant to cryopreservation.
  • Oocyte blastocyst rates showed a high correlation with accumulative osmotic damage during CPA handling.
  • Conducting CPA addition steps at 25°C is preferable for vitrification.

Conclusions:

  • Theoretical models are valuable tools for designing optimal cryopreservation protocols, particularly slow cooling.
  • Cell container selection is a critical factor in successful cryopreservation.
  • Further systematic research is needed to optimize the final dilution process in vitrification procedures.