Human Reproduction, Vol. 17, No. 1, 55-62,
January 2002
© 2002 European Society of Human Reproduction and Embryology
Germ cell transplantation into X-irradiated monkey testes
Institute of Reproductive Medicine of the University, Münster, Germany
BACKGROUND: An intense debate is ongoing regarding options for fertility protection in oncological patients. Germ cell transplantation has been applied to restore mouse spermatogenesis. Here, an attempt to apply autologous germ cell transplantation to a primate animal model is described. METHODS: Five adult male cynomolgus monkeys were biopsied to retrieve and cryopreserve germ cells before both testes were irradiated (dose 2 Gy). Six weeks later, each monkey received an infusion of its own cell suspension into the right testis, while the left testes were infused with saline. Testis size, sperm counts and serum concentrations of inhibin, FSH and testosterone were analysed weekly for 9 months. Spermatogenic recovery was determined histologically at the end of the study. RESULTS: In four monkeys, the germ cell-infused right testes showed a slight to moderate increase in the rate of regrowth in comparison with the left testes. In two monkeys the right testis proceeded to recover more prominently, resulting in larger right testis volumes and better or full spermatogenic recovery at the study end. Restoration of spermatogenesis occurred as an all-or-nothing event. Inhibin B concentrations increased, while FSH and testosterone concentrations decreased with testicular regrowth. Sperm counts did not recover. CONCLUSIONS: The present study demonstrates the immaturity and complexity of germ cell transplantation as a clinical approach.
Key words: cancer/fertility/irradiation/spermatogonia/testis
1 To whom correspondence should be addressed at: Institute of Reproductive Medicine of the University, Domagkstrasse 11, D-48149 Münster, Germany. E-mail: schlats{at}uni-muenster.de
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