Human Reproduction, Vol. 15, No. 8, 1713-1716,
August 2000
© 2000 European Society of Human Reproduction and Embryology
In-vitro differentiation of germ cells from frozen testicular biopsy specimens
1 Laboratoire d'Eylau, 55 rue Saint-Didier, 75116 Paris, France, 2 MAR&Gen, Molecular Assisted Reproduction and Genetics, 3 Department of Biochemistry and Molecular Biology, University of Granada Faculty of Sciences, Granada, Spain, 4 Andrology Centre `John MacLeod', Naples and 5 Centre for Reproductive Medicine, European Hospital, Rome, Italy
In some men with germ cell maturation arrest, spermatogenesis can be resumed during in-vitro culture of testicular biopsy samples. In this study, we examined whether similar differentiation events can be induced in cultured germ cells from cryopreserved testicular biopsy specimens. Fresh and cryopreserved aliquots of the same testicular biopsy samples were cultured in medium supplemented with FSH and testosterone. After 24 and 48 h of culture, the progression of spermatogenesis and the percentage of Sertoli cells with DNA damage, detected by terminal deoxynucleotidyl transferase-mediated dUTP nick-end labelling (TUNEL), were evaluated. Spermatogenesis progressed in a similar way in fresh and cryopreserved aliquots over the first 24 h of culture. However, in contrast to fresh aliquots, no additional progress of spermatogenesis was detected between the 24 and 48 h time points. The percentage of TUNEL-positive Sertoli cells in fresh aliquots showed only a moderate increase after 24 h of culture, whereas most Sertoli cells from cryopreserved aliquots became TUNEL-positive during the same culture period. These data show that limited progression of spermatogenesis can be achieved by culturing cryopreserved testicular biopsy specimens for 24 h, but no additional benefit can be expected from prolonging the culture beyond this time point.
Key words: cryopreservation/in-vitro spermatogenesis/spermatid/spermatocyte/testicular biopsy
6 To whom correspondence should be addressed at: Laboratoire d'Eylau, 55 rue Saint-Didier, 75116 Paris, France.E-mail: cmendoza{at}goliat.ugr.es
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