Abstract
Cryopreservation of human ovarian tissue represents a key procedure for fertility preservation. The two most widely used cryopreservation methods for human ovarian cortex samples are slow freezing\thawing (SF\T) and vitrification\warming (V\W). The aim of the present study was to analyze the effects of SF\T and V\W using a metal chamber, on specific follicle and oocyte structures and on the stromal organization post-cryopreservation. We did histology analysis of SF\T and V\W ovarian fragments from nine healthy subjects. Overall results showed that cryopreserved tissues presented significant rates of damage in primordial and primary follicles. Altered nuclear structure of primordial follicles and cell detachment from primordial and primary follicles were the main injuries observed after V/W and SF/T. The stromal components were similarly well preserved after cryopreservation. We conclude that both cryopreservation methods may be used for fertility preservation purposes with similar outcomes in terms of follicular and stromal integrity. Detachment of follicle cells from basal membrane represents an important cryoinjury that deserves further investigation.
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All authors include information of no funding, non-financial interests, study-specific approval by the appropriate ethics committee for research involving humans (Conceição Hospital Group Ethics Committee approval #17,135) and informed consent as the research involved human participants (Informed consent was given and signed by all participants).
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We thank Mr Maikel Oliveira (Department of Morphological Sciences, ICBS, Federal University of Rio Grande do Sul) for helping with the histology procedures.
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The questionnaire and methodology for this study was approved by the Human Research Ethics committee of the Conceição Hospital Group (Ethics approval number:17135).
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Ramos, L., Galbinski, S., Nacul, A. et al. Detailed Morphological Analysis of Cryoinjury in Human Ovarian Tissue Following Vitrification or Slow Freezing. Reprod. Sci. 29, 2374–2381 (2022). https://doi.org/10.1007/s43032-021-00716-x
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DOI: https://doi.org/10.1007/s43032-021-00716-x