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  • Title: Reduced levels of intracellular reactive oxygen species and apoptotic status are not correlated with increases in cryotolerance of bovine embryos produced in vitro in the presence of antioxidants.
    Author: Rocha-Frigoni NA, Leão BC, Nogueira É, Accorsi MF, Mingoti GZ.
    Journal: Reprod Fertil Dev; 2014; 26(6):797-805. PubMed ID: 25319378.
    Abstract:
    The effects of intracellular (cysteine and β-mercaptoethanol) and extracellular (catalase) antioxidant supplementation at different times during in vitro production (IVM and/or in vitro culture (IVC)) on bovine embryo development, intracellular reactive oxygen species (ROS) levels, apoptosis and re-expansion rates after a vitrification-thawing process were examined. Blastocyst frequencies were not affected by either antioxidant supplementation (40.5%-56.4%) or the timing of supplementation (41.7%-55.4%) compared with control (48.7%; P>0.05). Similarly, antioxidants and the moment of supplementation did not affect (P>0.05) the total number of blastomeres (86.2-90.5 and 84.4-90.5, respectively) compared with control (85.7). However, the percentage of apoptotic cells was reduced (P<0.05) in groups supplemented during IVM (1.7%), IVC (2.0%) or both (1.8%) compared with control (4.3%). Intracellular ROS levels measured in Day 7 blastocysts were reduced (P<0.05) in all groups (0.60-0.78), with the exception of the group supplemented with β-mercaptoethanol during IVC (0.88), which did not differ (P>0.05) from that in the control group (1.00). Re-expansion rates were not affected (P>0.05) by the treatments (50.0%-93.0%). In conclusion, antioxidant supplementation during IVM and/or IVC reduces intracellular ROS and the rate of apoptosis; however, supplementation does not increase embryonic development and survival after vitrification.
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