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Updated: May 18, 2026
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Vitrification of In Vitro Matured Oocytes Collected from Adult and Prepubertal Ovaries in Sheep
Published on: July 10, 2021
Optimising vitrification of human oocytes using multiple cryoprotectants and morphological and functional assessment
V Y K Seet1, S Al-Samerria, J Wong
1School of Biomedical Sciences, Western Australian Biomedical Research Institute, Curtin Health Innovation Research Institute, Curtin University, Kent St, Bentley, Perth, WA 6102, Australia.
Reproduction, Fertility, and Development
|September 13, 2012
Summary
Combining cryoprotectants improves oocyte quality and survival rates during vitrification, offering a better approach for fertility preservation. This study highlights the limitations of solely assessing oocyte morphology after cryopreservation.
Area of Science:
- Reproductive biology
- Cryobiology
- In vitro fertilization (IVF)
Background:
- Oocyte vitrification is crucial for fertility preservation.
- High cryoprotectant concentrations can harm oocyte quality and offspring.
- Current morphological assessment of vitrified oocytes is insufficient.
Purpose of the Study:
- To evaluate if cryoprotectant combinations at lower concentrations improve cryosurvival compared to single high concentrations.
- To assess oocyte quality using both morphological and functional parameters after vitrification.
- To determine the impact of different cryoprotectant combinations on oocyte quality.
Main Methods:
- Vitrification of surplus oocytes from IVF patients using the Cryotop method.
- Application of various cryoprotectants individually and in combination.
- Assessment of oocyte quality via light microscopy and mitochondrial integrity quantification.
Main Results:
- Oocyte quality was significantly higher with cryoprotectant combinations versus single agents.
- Oocyte quality varied based on specific cryoprotectants and combination types.
- Morphological assessment alone can be insufficient and misleading for cryosurvival rates.
Conclusions:
- Cryoprotectant combinations enhance vitrified oocyte quality and survival.
- Functional assessment (e.g., mitochondrial integrity) is vital alongside morphology.
- Optimized cryopreservation protocols are essential for successful fertility preservation.
