Antioxidantes associados à pressão hidrostática sobre a viabilidade embrionária pós desvitrificação

Abstract

This study aimed to evaluate different antioxidants in embryo culture after vitrification, with or without the previous use of hydrostatic pressure (PH). Considering this, three experiments were designed to evaluate the interaction between PH and antioxidants (β-mercaptoethanol - BME, cysteamine - CYST and BME + CYST) in fresh and vitrified in vitro produced embryos. In experiment 1 hatching and degeneration rates were evaluated with 24 and 48 hours after passing through the PH and in experiment 2, the same parameters were evaluates at 12, 24, 48 and 72 hours after heating. The last step of the study evaluated the pregnancy rate of vitrified embryos, cultured for 12 hours with / without antioxidant. The first experiment showed no difference between treatments the differences, independent of the treatment, were obtained between expanded blastocyst (BX) and blastocyst (BL). The second experiment found similar results for all parameters evaluated in embryos BX. Note that the BME + cyst treatment got better hatching rate in the BL with 48 and 72 hours (76.04%) than the control group (45.83%). The same behavior was observed in degeneration 24 hours, where the BME + CYST group was 7.29 % against 32.29% in the control group. However, the pregnancy rates (55 embryo transfers) were not different between groups control fresh, control vitrified and BME (38.9%, 16.7% and 31.6%, respectively). This study showed that the use of hydrostatic pressure and antioxidant had no effect in the evaluated parameters. However. there is a significant improvement to BL embryos when combining BME + CYST in the culture medium after vitrification.