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- W2783131277 abstract "Thawed bovine spermatozoa are characterized by a lack of homogeneity in the acrosomal membrane. Therefore, it is difficult to visualize the acrosome to assess morphology. Synthetic proteinase inhibitors were tested on thawed bovine semen for their effect on the integrity of acrosomal membranes. The proteinase inhibitors 4-nitrophenyl-4-guanidinobenzoate (NPGB) and N-L-p-tosyl-L-lysine-chloromethylketone (TLCK) were added to a medium containing spermatozoa separated on a percoll gradient. After incubation for 30 min at 38 °C in 5% CO2, 95% air (final concentration 1 mM), the action of these inhibitors was controlled by measuring the activity of acrosome proteinases. The acrosomal membrane was evaluated by means of a dual stain procedure (trypan blue, Giemsa). In contrast to spermatozoa that had been incubated with proteinase inhibitor-free solution, samples that had been incubated with TLCK showed homogeneity in 90% of the acrosomal membranes and excellent visualization of the acrosome itself; in the NPGB-treated samples, homogeneous staining was observed in 83% of spermatozoa (P < 0.0005). It is concluded that alteration of the acrosomal membrane in thawed semen is not directly caused by freezing-thawing, but may be due to activation of acrosomal proteinases, which is increased during staining procedures. The addition of proteinase inhibitors before staining offers a new possibility for improved assessment of the acrosome in bovine spermatozoa." @default.
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- W2783131277 date "1994-01-03" @default.
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- W2783131277 title "Evaluation of the acrosomal membrane in bovine spermatozoa: effects of proteinase inhibitors" @default.
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