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• W2221110423 abstract "For decades it has been known that reactive oxidative species (ROS) form during in vitro embryo culture. A buildup of ROS can be detrimental to individual cells in the embryo and lead to a decrease in development and quality. To overcome oxidative stress in culture systems, additives, such as taurine and/or hypotaurine, have been used. In the pig, taurine or hypotaurine addition is deemed necessary for normal in vitro development. Another commonly used technique to reduce ROS is to culture embryos in a lowered oxygen environment (e.g. 5%). Porcine zygote medium 3 (PZM3) base culture medium is used in the following experiments and contains 5 mM hypotaurine, which is one of the most costly additives in the medium. The objective of this experiment was to determine if hypotaurine is still necessary if the embryos were cultured in 5% O2 from the zygote to the Day 6 blastocyst stage. In Experiment 1, oocytes were matured for 44 h and fertilized in vitro. After fertilization, presumptive zygotes were then transferred to 500 µL of MU-1 medium (PZM3 with 1.69 mM arginine) that either contained or did not contain hypotaurine for overnight culture at 20% O2. On Day 1, the same embryo culture plates were moved to 5% O2, 5% CO2, and 90% N2 and cultured to Day 6. The percent blastocyst stage was determined, and total cell number was counted in 3 of the 5 replicates in order to give us an indication of the embryo quality. The percent blastocyst in the controls (+hypotaurine) was 34.4% ± 2.8 and not different from the no hypotaurine (32.9% ± 2.2; N = 830; 5 replications; P > 0.10). Furthermore, total cell number was not different between the two groups (30.8 ± 1.5 v. 33.6 ± 1.8, respectively, N = 146; 3 replications; P > 0.10). In Experiment 2, the same experiment was repeated in somatic cell nuclear transfer derived embryos, which may be more sensitive to ROS due to the micromanipulation procedure. Wild type fetal fibroblast cells were used as donor cells. There was no significant difference in development to the blastocyst stage due to the presence or absence of hypotaurine (17.7% ± 2.5 v. 11.8% ± 2.3, respectively; N = 454; 4 replications; P = 0.07). All blastocyst data were analysed using the GENMOD procedure in SAS 9.4 (SAS Institute Inc., Cary, NC, USA), and cell number data were analysed using the PROC GLM also with SAS 9.4. These data show that porcine embryos can be efficiently cultured to the blastocyst stage without adding any oxygen free radical scavengers to the media when culturing in reduced oxygen atmosphere. Further studies include evaluating term development via embryo transfers and measuring ROS production of these embryos. Funding was provided by Food for the 21st Century and the National Institutes of Health (U42 OD011140)." @default.
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• W2221110423 date "2016-01-01" @default.
• W2221110423 modified "2023-09-27" @default.
• W2221110423 title "83 IN LOW OXYGEN CULTURE, IS HYPOTAURINE NECESSARY FOR IN VITRO DEVELOPMENT OF PORCINE EMBRYOS?" @default.
• W2221110423 doi "https://doi.org/10.1071/rdv28n2ab83" @default.
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