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- W2000397783 abstract "We have recently reported that the survival of mouse spermatozoa is decreased when they are warmed at a suboptimal rate after being frozen at an optimal rate. We proposed that this drop in survival is caused by physical damage derived from the recrystallization of extracellular ice during slow warming. The first purpose of the present study was to determine the temperatures over which the decline in survival occurs during slow warming and the kinetics of the decline at fixed subzero temperatures. The second purpose was to examine the effects of antifreeze proteins (AFP) on the survival of slowly warmed mouse spermatozoa, the rationale being that AFP have the property of inhibiting ice recrystallization. With respect to the first point, a substantial loss in motility occurred when slow warming was continued to higher than -50 degrees C and the survival of the sperm decreased with an increase in the temperature at which slow warming was terminated. In contrast, the motility of sperm that were warmed rapidly to these temperatures remained high initially but dropped with increased holding time. At -30 degrees C, most of the drop occurred in 5 min. These results are consistent with the hypothesis that damage develops as a consequence of the recrystallization of the external ice. AFP ought to inhibit such recrystallization, but we found that the addition of AFP-I, AFP-III, and an antifreeze glycoprotein at concentrations of 1-100 microg/ml did not protect the frozen-thawed cells; rather it led to a decrease in survival that was proportional to the concentration. There was no decrease in survival from exposure to the AFP in the absence of freezing. AFP are known to produce changes in the structure and habit of ice crystals, and some have reported deleterious consequences associated with those structural changes. We suggest that such changes may be the basis of the adverse effects of AFP on the survival of the sperm, especially since mouse sperm are exquisitely sensitive to a variety of mechanical stresses." @default.
- W2000397783 created "2016-06-24" @default.
- W2000397783 creator A5026970682 @default.
- W2000397783 creator A5087786993 @default.
- W2000397783 date "2002-08-01" @default.
- W2000397783 modified "2023-09-28" @default.
- W2000397783 title "Effects of warming rate, temperature, and antifreeze proteins on the survival of mouse spermatozoa frozen at an optimal rate" @default.
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- W2000397783 doi "https://doi.org/10.1016/s0011-2240(02)00105-0" @default.
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