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Updated: May 5, 2026
Germ Cell Transplantation and Testis Tissue Xenografting in Mice
Published on: February 6, 2012
Cell-cycle-dependent colonization of mouse spermatogonial stem cells after transplantation into seminiferous tubules
Kei Ishii1, Mito Kanatsu-Shinohara, Takashi Shinohara
1Department of Molecular Genetics, Graduate School of Medicine, Kyoto University, Kyoto 606-8501, Japan.
Abstract:
Spermatogonial stem cells (SSCs) migrate to the niche upon introduction into the seminiferous tubules of the testis of infertile animals. However, only 5-10% of the transplanted cells colonize recipient testes. In this study, we analyzed the impact of cell cycle on spermatogonial transplantation. We used fluorescent ubiquitination-based cell cycle indicator transgenic mice to examine the influence of cell cycle on SSC activity of mouse germline stem (GS) cells, a population of cultured spermatogonia enriched for SSCs. GS cells in the G1 phase are more efficient than those in the S/G2-M phase in colonizing the seminiferous tubules of adult mice. Cells in the G1 phase not only showed higher expression levels of GFRA1, a component of the GDNF self-renewal factor receptor, but also adhered more efficiently to laminin-coated plates. Furthermore, this cell cycle-dependency was not observed when cells were transplanted into immature pup recipients, which do not have the blood-testis barrier (BTB) between Sertoli cells, suggesting that cells in the G1 phase may passage through the BTB more readily than cells in the S/G2-M phase. Thus cell cycle status is an important factor in regulating SSC migration to the niche.
Insights
Spermatogonial stem cell transplantation efficiency is improved by selecting cells in the G1 phase. G1 phase spermatogonial stem cells (SSCs) better colonize the testes, suggesting cell cycle regulation is key for successful stem cell therapy.
Area of Science:
- Reproductive biology
- Stem cell biology
- Developmental biology
Background:
- Spermatogonial stem cells (SSCs) are crucial for male fertility and can be transplanted to restore it.
- Current SSC transplantation methods have low efficiency, with only 5-10% of cells successfully colonizing recipient testes.
- Understanding factors influencing SSC colonization is vital for improving transplantation outcomes.
Purpose of the Study:
- To investigate the impact of the cell cycle on spermatogonial stem cell (SSC) transplantation efficiency.
- To determine if specific cell cycle phases enhance SSC colonization in recipient testes.
- To explore the role of the blood-testis barrier (BTB) in cell cycle-dependent SSC migration.
Main Methods:
- Utilized fluorescent ubiquitination-based cell cycle indicator transgenic mice to track cell cycle phases of germline stem (GS) cells.
- Compared the colonization efficiency of GS cells in G1 phase versus S/G2-M phase after transplantation into adult mouse testes.
- Assessed GFRA1 expression and adhesion properties of GS cells in different cell cycle phases.
- Evaluated cell cycle-dependent transplantation in immature pup recipients lacking a developed BTB.
Main Results:
- Germline stem (GS) cells in the G1 phase demonstrated significantly higher efficiency in colonizing seminiferous tubules compared to cells in the S/G2-M phase.
- G1 phase cells exhibited increased expression of GFRA1, a key component of the GDNF receptor, and enhanced adhesion to laminin-coated surfaces.
- The observed cell cycle dependency on colonization was diminished in immature recipients lacking a mature blood-testis barrier (BTB).
Conclusions:
- Spermatogonial stem cell (SSC) migration and colonization are significantly influenced by the cell cycle phase.
- G1 phase SSCs are more effective in colonizing the testicular niche, potentially due to enhanced GFRA1 expression and adhesion.
- The blood-testis barrier (BTB) may play a role in the preferential passage of G1 phase SSCs, highlighting cell cycle status as a critical factor for successful SSC transplantation and niche entry.
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