Hum. Reprod. Advance Access published online on January 23, 2008
Human Reproduction, doi:10.1093/humrep/dem414
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Ovarian tissue viability following whole ovine ovary cryopreservation: assessing the effects of sphingosine-1-phosphate inclusion
1 Division of Agricultural and Environmental Sciences, School of Biosciences, University of Nottingham, Sutton Bonington, Loughborough, Leicestershire, LE12 5RD, UK 2 Division of Obstetrics and Gynaecology, School of Human Development, University of Nottingham, Queens Medical Centre, Nottingham, Nottinghamshire, NG7 2UH, UK
3 Correspondence address. Tel: +44-115-951-6061; E-mail: bob.webb{at}nottingham.ac.uk
BACKGROUND: Cryopreservation is hypothesized to result in apoptosis, contributing to stromal damage and follicle loss in ovarian tissue. This study investigated tissue viability following whole ovine ovary cryopreservation and examined the effects of the anti-apoptotic agent sphingosine-1-phosphate (S-1-P) on ovarian cryopreservation efficiency.
METHODS: Whole ovine ovaries were cryoperfused and subjected to slow-freeze, rapid-thaw cryopreservation before a range of functional viability tests were performed. The effects of 20 µmol–1 S-1-P, in the cryopreservation media, were then assessed against a control cryopreservation media and non-frozen tissue.
RESULTS: Granulosa cell viability (assessed by trypan blue) was not significantly affected, however, Ki67 expression, indicative of cellular proliferation, was reduced following cryopreservation (P< 0.05). Following S-1-P supplementation, granulosa cell viability was not affected by either cryopreservation or S-1-P inclusion. Bromodeoxyuridine uptake, demonstrating DNA synthesis, was seen in both cryopreserved and fresh cortical tissue and the viability stain, 5(6)carboxyfluorescein diacetate succinimidyl ester, showed many viable small follicles. Cryopreservation increased arterial endothelial disruption (P< 0.01), but not internal elastic lamina rupture or venous damage. However, S-1-P supplementation did not improve ovarian or vascular tissue survival.
CONCLUSION: These results are encouraging for whole ovary cryopreservation, demonstrating maintained cell viability, however, they do not support S-1-P inclusion at this concentration to improve tissue viability following cryopreservation.
Key words: cryopreservation/whole ovary/viability/sphingosine-1-phosphate/ovarian graft
Submitted on March 2, 2007; resubmitted on November 20, 2007; accepted on December 9, 2007.
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