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Fertility Preservation Through Oocyte Vitrification: Clinical and Laboratory Perspectives
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Mathematically optimized cryoprotectant equilibration procedures for cryopreservation of human oocytes
Allyson Fry Davidson, James D Benson, Adam Z Higgins1
1School of Chemical, Biological and Environmental Engineering, Oregon State University, 102 Gleeson Hall, Corvallis, Oregon 97331-2702, USA. adam.higgins@oregonstate.edu.
Theoretical Biology & Medical Modelling
|March 22, 2014
Summary
Optimized cryopreservation of human oocytes uses a new mathematical approach for simpler, less toxic procedures. This method facilitates ice-free vitrification, reducing damage and improving assisted reproduction outcomes.
Area of Science:
- Reproductive biology
- Biophysics
- Cryobiology
Background:
- Effective cryopreservation of human oocytes is crucial for assisted reproduction, facing challenges of osmotic and toxic damage from cryoprotective agents (CPAs).
- Vitrification offers ice-free cryopreservation but requires high CPA concentrations, increasing cell damage risks.
- Previous work introduced a mathematical optimization for CPA equilibration to minimize damage.
Purpose of the Study:
- To adapt and refine a mathematical algorithm for piecewise-constant CPA concentration changes in oocyte cryopreservation.
- To investigate the impact of alternate equilibration endpoints on predicted protocol toxicity.
- To compare these new procedures with existing experimental and continuous-change optimized methods.
Main Methods:
- Algorithm refinement to predict piecewise-constant CPA concentration adjustments.
- Investigation of toxicity at different CPA equilibration endpoints.
- Comparative analysis against conventional and continuous-change cryopreservation protocols.
Main Results:
- The algorithm predicts optimal CPA exposure sequences involving initial cell swelling followed by shrinkage to target intracellular concentrations.
- Post-thaw procedures involve CPA-free solutions, inducing cell swelling.
- Predicted toxicity is significantly lower than conventional methods and comparable to continuous-change protocols.
Conclusions:
- Piecewise-constant CPA procedures are experimentally feasible and predicted to be less toxic for human oocyte cryopreservation.
- The mathematical optimization framework can be applied to design cryopreservation protocols for other cell types.
