Effects of thioredoxin on the preimplantation development of bovine embryos

被引:25
作者
Bing, YZ
Hirao, Y
Takenouchi, N
Che, LM
Nakamura, H
Yodoi, J
Nagai, T [1 ]
机构
[1] Natl Inst Agrobiol Sci, Dept Dev Biol, Tsukuba, Ibaraki 3058602, Japan
[2] Kyoto Univ, Inst Virus Res, Kyoto, Japan
[3] Natl Agr Res Ctr Tohoku Region, Morioka, Iwate, Japan
关键词
thioredoxin (TRX); bovine; embryo development; first cleavage stage;
D O I
10.1016/S0093-691X(02)01158-5
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
Thioredoxin (TRX) is an ubiquitous protein disulfide reductase, which is known to be involved in the implantation development of mouse embryos. In the present study, recombinant human TRX was used to evaluate its effect on the promotion of preimplantation development of bovine embryos derived from in vitro maturation and fertilization. Supplementation of the medium 24 h post insemination with TRX significantly (P < 0.05) enhanced the frequency of development to the blastocyst stage in 5% O-2 concentration. The optimal concentration was 0.5 mug/ml (P < 0.05, compared with 0, 0.1 and 1.0 mug/ml). This effect of TRX was evident only when added around the time of the first cleavage stage (24 h post insemination); no promotion was found with treatment at 6 h (one-cell) or 44 h (six- to eight-cell) after insemination. Moreover, it is of interest that even with the best combination of the dose and timing of TRX treatment (0.5 mug/ml, at 24 h post insemination), no promotion of development was observed when embryos were cultured under 20% O-2. However, a preincubation of TRX in the culture medium under 20% oxygen for 24 h did not diminish the promoting effect in the subsequent TRX treatment under optimal conditions, thus suggesting that the possible oxidation of TRX alone may not be the reason for the disappearance of the effect under a high oxygen concentration. These results indicate that TRX does improve the development of bovine embryos in vitro, though unlike the general reducing reagents such as beta-mercaptoethanol or cysteamine, TRX may have to exert its effect at specific times and in more physiologic oxygen environments. (C) 2002 Elsevier Science Inc. All rights reserved.
引用
收藏
页码:863 / 873
页数:11
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