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• W1982503742 abstract "The generation of reactive oxygen species (ROS) is associated with some factors such as oxidative substrate sources, mitochondrial function and NAD(P)H oxidase activity. In bovine spermatozoa, heparin capacitation produces a respiratory burst sensitive to diphenyleneiodonium (DPI). Creatine kinase (CK) is related to extramitochondrial ATP disponibility. Our purpose was to determine the variation in ROS level and its relation with NAD(P)H oxidase sensitive to DPI and CK participation, as factors involved in redox state and energy generation in capacitation. The chlortetracycline technique was used to evaluate capacitation. CK activity and ROS level were measured by spectrophotometry and spectrofluorometry respectively. The capacitation percentage was increased by heparin or quercetin treatment (P < 0.05) and no significant differences in sperm viability were observed. Samples treated with heparin or quercetin maintained the same ROS level as control (238.62 ± 23.47 arbitrary units per 108 spermatozoa) (P > 0.05). CK activity decreased by 50% with heparin or quercetin (P < 0.05). In DPI presence, capacitation was inhibited and differential CK activities and ROS level variations were observed in heparin- or quercetin-treated samples (P < 0.05). In cryopreserved bovine spermatozoa, capacitation requires equilibrium between oxidative damage susceptibility and ROS levels. CK activity is associated with redox state variation and energy sources. In conclusion, capacitation induction depends on NADPH oxidase and the shuttle creatine–creatine phosphate, both sensitive to DPI." @default.
• W1982503742 created "2016-06-24" @default.
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• W1982503742 date "2008-12-01" @default.
• W1982503742 modified "2023-09-26" @default.
• W1982503742 title "Variations in creatine kinase activity and reactive oxygen species levels are involved in capacitation of bovine spermatozoa" @default.
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• W1982503742 doi "https://doi.org/10.1111/j.1439-0272.2008.00871.x" @default.
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