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Updated: Oct 21, 2025
Mouse Sperm Cryopreservation and Recovery using the I·Cryo Kit
Published on: December 12, 2011
Autophagy modulation alleviates cryoinjury in murine spermatogonial stem cell cryopreservation
Sang-Eun Jung1, Jin Seop Ahn1, Yong-Hee Kim1
1Department of Animal Science and Technology, Chung-Ang University, Anseong, Gyeonggi-do, Republic of Korea.
Background:
Cryopreservation can expand the usefulness of spermatogonial stem cells (SSCs) in various fields. However, previous investigations that have attempted to modulate cryoinjury-induced mechanisms to increase cryoprotective efficiency have mainly focused on apoptosis and necrosis.
Objectives:
This study aimed to establish an effective molecular-based cryoprotectant for SSC cryopreservation via autophagy modulation.
Materials And Methods:
To determine the efficacy of autophagy modulation, we assessed the recovery rate and relative proliferation rate and performed western blotting for the determination of autophagy flux, immunocytochemistry and real-time quantitative polymerase chain reaction (RT-qPCR) for SSC characterization, and spermatogonial transplantation for in vivo SSC functional activity.
Results:
The results showed that a basal level of autophagy caused a higher relative proliferation rate (pifithrin-μ 0.01 μM, 184.2 ± 11.2%; 3-methyladenine 0.01 μM, 175.3 ± 10.3%; pifithrin-μ 0.01 μM + 3-methyladenine 0.01 μM, P3, 224.6 ± 22.3%) than the DMSO control (100 ± 6.2%). All treatment groups exhibited normal characteristics, suggesting that these modulators could be used as effective cryoprotectants without changing the properties of the undifferentiated germ cells. According to the results of the in vivo spermatogonial transplantation assay, the colonies per total number of cultured SSCs was significantly higher in the pifithrin-μ 0.01 μM (1596.7 ± 172.5 colonies), 3-methyladenine 0.01 μM (1522.1 ± 179.2 colonies), and P3 (1727.5 ± 196.5 colonies) treatment groups than in the DMSO control (842.8 ± 110.08 colonies), which was comparable to that of the fresh control (1882.1 ± 132.1 colonies).
Discussion:
A basal level of autophagy is more essential for resilience in frozen SSCs after thawing, rather than the excessive activation or inhibition of autophagy.
Conclusion:
A basal level of autophagy plays a critical role in the pro-survival response of frozen SSCs after thawing; herein, a new approach by which SSC cryoprotective efficiency can be improved was identified.
Insights
Maintaining a basal level of autophagy is crucial for the survival of frozen spermatogonial stem cells (SSCs) post-thaw. This study identifies autophagy modulation as a novel cryoprotective strategy for SSCs.
Area of Science:
- Reproductive Biology
- Cell Biology
- Cryobiology
Background:
- Cryopreservation of spermatogonial stem cells (SSCs) is vital for various applications.
- Previous cryoprotective strategies focused on apoptosis and necrosis, neglecting other mechanisms.
- Autophagy modulation presents a novel avenue for enhancing SSC cryopreservation.
Purpose of the Study:
- To develop a molecular-based cryoprotectant for SSCs by modulating autophagy.
- To investigate the role of basal autophagy levels in SSC cryosurvival.
Main Methods:
- Assessed SSC recovery, proliferation, and characteristics using western blotting, immunocytochemistry, and RT-qPCR.
- Evaluated in vivo SSC functional activity through spermatogonial transplantation.
- Modulated autophagy using pifithrin-μ and 3-methyladenine.
Main Results:
- Basal autophagy levels significantly increased SSC relative proliferation rates compared to controls.
- Autophagy modulators maintained normal SSC characteristics.
- Spermatogonial transplantation assays showed significantly higher colony formation in treated groups.
Conclusions:
- A basal level of autophagy is essential for SSC resilience after cryopreservation and thawing.
- Autophagy modulation offers a promising new approach to improve SSC cryoprotective efficiency.
- This strategy enhances the survival and functionality of frozen SSCs.
