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Cryopreservation of isolated mouse germinal vesicles
Radomir Kren1, Josef Fulka, Helena Fulka
1Institute of Animal Production, Prague, Czech Republic. kren@vuzv.cz
The Journal of Reproduction and Development
|December 16, 2004
Summary
Cryopreserving oocyte germinal vesicles (GV) using the open pulled straws (OPS) method shows high survival rates. Reconstructing oocytes with thawed GV-karyoplasts successfully produced mature secondary oocytes.
Area of Science:
- Reproductive Biology
- Cryobiology
- Oocyte Maturation
Background:
- Current methods for storing unfertilized oocytes (immature, maturing, or mature) remain suboptimal.
- Developing effective oocyte preservation techniques is crucial for assisted reproductive technologies and fertility preservation.
Purpose of the Study:
- To investigate the efficacy of vitrifying isolated germinal vesicles (GV) as karyoplasts from immature oocytes.
- To assess the viability and developmental potential of reconstructed oocytes following GV-karyoplast cryopreservation and fusion.
Main Methods:
- Germinal vesicles (GV) were isolated as karyoplasts from immature oocytes.
- Vitrification was performed using the open pulled straws (OPS) method within evacuated porcine zonae pellucidae.
- Thawed GV-karyoplasts were fused to immature oocyte cytoplasts for reconstruction.
Main Results:
- The survival rate of vitrified-warmed GV-karyoplasts was nearly absolute.
- Reconstructed oocytes successfully underwent maturation.
- The process yielded secondary oocytes arrested at metaphase II.
Conclusions:
- Vitrification of isolated GV-karyoplasts using the OPS method is a highly effective technique for oocyte preservation.
- This approach offers a promising strategy for improving the storage of immature oocytes.
- Successful reconstruction and maturation demonstrate the potential of this method for future applications in fertility preservation.