Abstract
Ovarian tissue cryopreservation (OTC) is an accepted method of fertility preservation. However, OTC is not standardized and many variations exist in the freezing strategy, tissue processing, and surgical approach. In this pilot study, we used a sheep model to compare slow freezing versus vitrification techniques, as well as the feasibility of processing ovarian tissue into a hyaluronan suspension of small ovarian units. Twelve ovaries were harvested from six female ewes. Paired tissues from each animal were assigned to different treatments and underwent freezing, thawing, autotransplantation, and second-look surgery, for a total of 18 surgical procedures and 3 measured time points. Treatments included whole tissue strips versus gel suspension and slow freezing versus vitrification. At each of the time points, tissue viability was measured by immunohistochemical analysis of CD31 and cleaved caspase-3 (CCASP3). CD31 and CCASP3 expression levels were equivalent between slow freezing and vitrification, and between whole ovarian tissue strips and gel suspension of fragmented ovarian tissue, at all time points. These preliminary data using a sheep model suggest that ovarian tissue is robust and likely to be minimally affected by aggressive fragmentation using a hyaluronan suspension. Furthermore, we provide evidence in support of vitrification as a viable option in OTC. Hyaluronan suspension of ovarian cortical fragments is novel and may represent a desirable method for reimplantation of frozen-thawed ovarian tissue in patients where occult malignant cells are a concern.
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This research was made possible by internal funds from the Research Program Committee at Cleveland Clinic Lerner Research Institute.
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Anne Cashmore Davis, MD: study design, conduct of the experiments, data collection, data interpretation, and manuscript writing.
Elliott G. Richards, MD: conduct of the experiments, data collection, data interpretation, and manuscript writing.
Sara E. Arian, MD: study design and manuscript review.
Tommaso Falcone, MD: study design, conduct of the experiments, data collection, data interpretation, and manuscript review.
Nina Desai, HCLD, PhD: study design, data interpretation, and manuscript review.
Meng Yao, MS: data interpretation and manuscript review.
Andres Chiesa-Vottero, MD: data collection, data interpretation, and manuscript review.
Rebecca Flyckt, MD: study design, conduct of the experiments, data collection, data interpretation, and manuscript writing.
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The authors consider that Anne Cashmore Davis and Elliott G. Richards should be regarded as the joint first authors.
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Davis, A.C., Richards, E.G., Arian, S.E. et al. Diverse Approaches to Ovarian Tissue Cryopreservation Have Equivalent Outcomes in Markers of Tissue Viability. Reprod. Sci. 28, 2129–2135 (2021). https://doi.org/10.1007/s43032-021-00486-6
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DOI: https://doi.org/10.1007/s43032-021-00486-6