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  • Title: Cryopreservation of human ovarian tissue: comparison of novel direct cover vitrification and conventional vitrification.
    Author: Zhou XH, Wu YJ, Shi J, Xia YX, Zheng SS.
    Journal: Cryobiology; 2010 Apr; 60(2):101-5. PubMed ID: 19800618.
    Abstract:
    OBJECTIVE: To compare the effect of novel direct cover vitrification (DCV) and conventional vitrification (CV) for human ovarian tissue. STUDY DESIGN: Ovarian biopsy specimens obtained from 12 patients were randomly allocated into five groups: Fresh, DCV1, DCV2, DCV3 and CV. Three concentrations of cryoprotectants were used in DCV group. The equilibration solution of DCV1, DCV2, DCV3 was 5% EG+5% DMSO+DPBS, 7.5% EG+7.5%DMSO+DPBS, 10% EG+10% DMSO+DPBS, respectively. And the vitrification solution of DCV1, DCV2, DCV3 was 10% EG+10% DMSO+DPBS, 15%EG+15% DMSO+DPBS, 20% EG+20% DMSO+DPBS, respectively. The equilibration solution and the vitrification solution of CV group was same as DCV3 group. The effects of cryopreserved procedure on human ovarian tissue were studied by histology, TUNEL assay, transmission electron microscopy (TEM) and heterotopic allograft. RESULTS: The percentages of morphologically normal and viable follicles of DCV2 were significantly higher than DCV1, DCV3 and CV groups (P<0.05). TUNEL assay demonstrated that the incidence of apoptotic cell in vitrification ovarian tissue was significantly higher than fresh tissue (P<0.05), but there were no difference in various groups with cryopreservation. TEM showed that less damage was detected in DCV2 group. After grafting, the follicle density of DCV2 was greater than DCV1, DCV3 and CV groups (P<0.05). CONCLUSIONS: The novel cover vitrification with optimal concentration of cryoprotectants is superior to conventional vitrification. It is suitable for human ovarian tissue fragments with high efficiency and facility.
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