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- W2113858670 abstract "To develop novel cryopreservation methods, we estimated the permeability coefficients Lp (hydraulic conductivity) and PEG (cryoprotectant permeability) of mature human oocytes after exposure to ethylene glycol (EG) and tested the efficiency of a multi-step slow cooling protocol based on this cryoprotectant. Oocytes were perfused with 1.5 mol/l EG for 10 min. Oocyte volume at each time point was calculated and normalized to the original volume. Slow cooling was conducted by exposing oocytes to increasing EG concentrations (0.5, 1.0 and 1.5 mol/l n = 155) or 1.5 mol/l of propane-1,2-diol (PrOH) n = 102. Oocytes which survived cryopreservation n = 80 and fresh oocytes n = 73 were prepared for confocal microscopy analysis of the meiotic spindle. During EG exposure, oocytes underwent an abrupt 50% volume reduction. Complete recovery of the initial volume was not observed. From the values of a best fit plot, the coefficients Lp = 0.82 ± 0.29 µm min−1 atm−1 (mean ± SD) and PEG 0.10 ± 0.01 µm s−1 were generated. Survival rates after freezing with EG were lower than with PrOH (51.6 versus 71.5%, respectively, P < 0.05). The frequencies of normal spindle configuration were lower in frozen EG and frozen PrOH oocytes compared with fresh oocytes (53.8, 50.9 and 66.7%, respectively, P < 0.05). The oocyte plasmalemma possesses limited permeability to EG and EG exposure causes considerable osmotic stress. However, post-thaw rates of survival and normal meiotic spindle organization may be preserved by protocols which are designed in order to minimize osmotic stress." @default.
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- W2113858670 date "2007-07-25" @default.
- W2113858670 modified "2023-10-14" @default.
- W2113858670 title "Permeability of human oocytes to ethylene glycol and their survival and spindle configurations after slow cooling cryopreservation" @default.
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- W2113858670 doi "https://doi.org/10.1093/humrep/dem240" @default.
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