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• W1978803574 abstract "Phosphodiesterase (PDE) inhibitors have been utilized for in vitro maturation (IVM) of oocytes to manipulate the meiotic resumption and progression. Premature chromatin condensation and DNA replication of the oocytes, immediately after the decrease in the cAMP level, are the difficulties in canine IVM. Caffeine, a nonselective competitive PDE inhibitor, due to its structural similarity to adenosine molecule maintains the cAMP level by occupying PDE enzymes such as PDE-3A inside the oocyte and PDE-4 and PDE-5 in the cumulus cells. In this study, the effects of 12-hour caffeine pretreatment in a biphasic IVM protocol were assessed on maturation rates of canine oocytes. Sixty hours of culture after a 12-hour of 10 mM caffeine pretreatment resulted in 16.9% ± 2.4 of the oocytes reaching metaphase II stage (MII) and 25.9% ± 5.2 degeneration rate compared with the control group with 2.2% ± 2.2 MII and 37.6% ± 4.3 degeneration rates (P < 0.05). Caffeine pretreatment induced higher mitogen-activated protein kinases (MAPK1 and MAPK3) phosphorylation and maturation-promoting factor activity at 12 hours and activated MAPK1 and maturation-promoting factor at 48 hours after culture in cumulus-oocyte complexes (COCs) compared with the control group (P < 0.05). Fresh canine COCs were also analyzed before IVM using brilliant cresyl blue (BCB) staining. Oocytes showed difference in meiotic resumption (MI-MII) (BCB+ = 16.11% ± 5.5, BCB- = 9.86% ± 5.0; P < 0.05) after 60 hours of culture following 12-hour caffeine pretreatment. The BCB+ canine oocytes had higher MII rate than the BCB- group under caffeine pretreatment (10.2% ± 2.9 vs. 1.1% ± 1.1, respectively; P < 0.05). Results indicated that 12-hour caffeine pretreatment of canine COCs improves the MII maturation rates at 72 hours and BCB+ oocytes have higher competency in vitro for nuclear maturation." @default.
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• W1978803574 date "2013-10-01" @default.
• W1978803574 modified "2023-09-24" @default.
• W1978803574 title "Influence of caffeine pretreatment on biphasic in vitro maturation of dog oocytes" @default.
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• W1978803574 doi "https://doi.org/10.1016/j.theriogenology.2013.06.020" @default.
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