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Suppression of spermatogenesis for cell transplantation in adult mice
P Vecino1, J A Uranga, J Aréchaga
1Department of Cell Biology, University of the Basque Country, 48940 Leioa, Spain.
Abstract:
Spermatogenesis occurs within the testis of adult males by a complex and very well organized process. Breakthroughs in techniques such as cryopreservation and culture of spermatogenic cells and the maturation of these cells in exogenous testes after transplantation renewed the interest in this process. Transplantation of spermatogenic cells from a donor to a recipient animal needs a preparatory step that consists in the elimination of the endogenous population of spermatogenic cells. The most common method used to empty the seminiferous tubules is the treatment with busulfan (1,4-butanediol dimethanesulfonate). Busulfan partially eliminates stem cells because of its alkylating nature, but a residual component of stem cells survives the treatment and competes in the regeneration of the testis with transplanted cells. Estradiol has also been used as an agent that causes a delay in the process of spermatogenesis by altering its hormonal stimulation, although it does not affect the spermatogonia population. Therefore, we have tested different treatments with busulfan, estradiol benzoate, and also an agonist of the chorionic gonadotrophin-releasing hormone, leuprolide acetate, for the inhibition of endogenous spermatogenesis. We have found that a combination of estradiol, busulfan, and leuprolide can destroy the population of endogenous spermatogenic cells without altering Sertoli cells and maintains the optimal environment needed to allow the development of transplanted cells.
Insights
Combining estradiol, busulfan, and leuprolide effectively eliminates endogenous spermatogenic cells. This treatment preserves Sertoli cells, creating an optimal environment for transplanted cell development in testes.
Area of Science:
- Reproductive Biology
- Cell Biology
- Endocrinology
Background:
- Spermatogenesis is crucial for male fertility and involves complex testicular processes.
- Advances in cell cryopreservation and transplantation have renewed interest in spermatogenesis research.
- Eliminating endogenous germ cells is essential for successful spermatogonial transplantation.
Purpose of the Study:
- To evaluate novel treatment combinations for complete elimination of endogenous spermatogenic cells.
- To identify a method that preserves the testicular microenvironment for cell transplantation.
- To optimize preparatory protocols for exogenous germ cell maturation in recipient testes.
Main Methods:
- Tested busulfan (1,4-butanediol dimethanesulfonate) alone and in combination with estradiol benzoate and leuprolide acetate.
- Assessed the impact of treatments on endogenous spermatogenic cell populations and Sertoli cells.
- Evaluated the suitability of the testicular environment for transplanted spermatogenic cells post-treatment.
Main Results:
- Busulfan alone partially eliminates stem cells, allowing residual cells to compete with transplanted cells.
- Estradiol delays spermatogenesis but does not eliminate spermatogonia.
- A combination of estradiol, busulfan, and leuprolide effectively eradicated endogenous spermatogenic cells while preserving Sertoli cells.
Conclusions:
- The combination of estradiol, busulfan, and leuprolide offers a superior method for eliminating endogenous spermatogenesis.
- This regimen creates an optimal niche for spermatogonial transplantation and subsequent germ cell development.
- This approach advances the potential for fertility restoration through germ cell transplantation.