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Oxidative stress on mouse embryo development in vitro
1Department of Gynecology and Obstetrics, Kyoto University Faculty of Medicine, Japan.
Free Radical Biology & Medicine
|January 1, 1992
Summary
Thioredoxin significantly improves mouse embryo development in vitro by preventing developmental blockage. This protein protects against oxygen radical damage, suggesting thiol oxidation is a key factor in embryo arrest.
Area of Science:
- Reproductive Biology
- Developmental Biology
- Biochemistry
Background:
- Oxygen radicals contribute to in vitro embryo developmental arrest.
- Protein thiol (SH) groups are susceptible to oxidation by oxygen radicals.
- Superoxide dismutase (SOD) and low oxygen tension can improve in vitro mouse embryo development.
Purpose of the Study:
- To investigate the effect of thioredoxin, a protein disulfide reductase, on mouse preimplantation embryo development in vitro.
- To determine if thioredoxin can overcome the in vitro developmental block.
- To explore the role of protein thiol oxidation in embryo development.
Main Methods:
- Mouse pronuclear embryos were cultured with thioredoxin (200 µg/mL).
- Embryo development was assessed by blastulation rate.
- Experiments involved stages from pronuclear to two-cell (17-48 h post-hCG).
- Combined effects of thioredoxin with SOD or low oxygen tension were evaluated.
Main Results:
- Thioredoxin significantly increased the blastulation rate (75.3%) compared to controls (8.9%).
- Thioredoxin's beneficial effects were observed between the pronuclear and two-cell stages.
- An additive effect was noted when thioredoxin was combined with SOD or low oxygen tension.
Conclusions:
- Protein thiol oxidation is implicated as a cause of in vitro embryo developmental blockage.
- Thioredoxin shows potential in mitigating this developmental block.
- Further research is needed to identify the specific protein targets of thioredoxin in embryo development.