Published in:
Open Access
01-12-2016 | Fertility Preservation
Clinically applied procedures for human ovarian tissue cryopreservation result in different levels of efficacy and efficiency
Authors:
Lobke Bastings, Johan R. Westphal, Catharina C. M. Beerendonk, Ruud L. M. Bekkers, Petra L. M. Zusterzeel, Jan C. M. Hendriks, Didi D. M. Braat, Ronald Peek
Published in:
Journal of Assisted Reproduction and Genetics
|
Issue 12/2016
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Abstract
Purpose
Different protocols are being used worldwide for the cryopreservation of human ovarian tissue for fertility preservation purposes. The efficiency and efficacy of the majority of these protocols has not been extensively evaluated, possibly resulting in sub-optimally cryopreserved ovarian tissue. To address the impact of this issue, we assessed the effects of two clinically successful human ovarian tissue slow-freezing cryopreservation procedures on the quality of the cryopreserved tissue.
Methods
To differentiate between cryopreservation (C) versus thawing (T) related effects, four combinations of these two (A and B) very different cryopreservation/thawing protocols (ACAT, ACBT, BCAT, BCBT) were studied. Before and after cryopreservation and thawing, the percentage of living and morphologically normal follicles, as well as the overall tissue viability, was assessed.
Results
Our experiments revealed that the choice of the cryopreservation protocol noticeably affected the overall tissue viability and percentage of living follicles, with a higher viability after protocol BC when compared to AC. No statistically significant differences in tissue viability were observed between the two thawing protocols, but thawing protocol BT required considerably more human effort and materials than thawing protocol AT. Tissue morphology was best retained using the BCAT combination.
Conclusion
Our results indicate that extensive and systematical evaluation of clinically used protocols is warranted.