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Ovarian cortical tissue cryopreservation with subsequent autografting is a potential strategy for the preservation of fertility in patients undergoing systemic chemotherapy and pelvic radiotherapy. Non-vascular implants are first subjected to a period of ischaemia before revascularization and are, therefore, vulnerable to ischaemia-reperfusion injury from reactive oxygen species. Ischaemia-reperfusion injury was investigated during the first week after surgery in murine ovarian grafts and human ovarian xenografts in mice with severe combined immune deficiency (SCID) by measuring total lipid peroxides and malondialdehyde concentrations with a colorometric assay. The effects of administering an antioxidant, vitamin E, on these concentrations were also tested. Products of lipid peroxidation were higher in non-supplemented murine autografts compared with control ovaries (P < 0.05), and were significantly reduced on day 3 by vitamin E administration (P < 0.05). Similarly, in human xenografts, there was a significant reduction in lipid peroxidation with vitamin E administration. These results correspond to a significantly greater total follicle survival in the murine grafts of the supplemented group (45 versus 72%; P < 0.05). They suggest that antioxidant treatment improves the survival of follicles in ovarian grafts by reducing ischaemia-reperfusion injury.
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