Carbohydrate Metabolism in Preimplantation Stage Embryos and the Role of Metabolites = 착상전 초기 배아에서 탄수화물 대사와 그 대사물의 역할

국문 초록 (Abstract)

수정란이 포배로 분화하는 것은 착상을 통하여 개체 발생이 성립되는 포유동물의 발생에 있어서 핵심적인 현상이다.. 초기 배아 발생 시기동안 배아는 생존을 위한 에너지원을 공급받아야 한다. 포유동물의 난자는 보통의 경우 난자 형성 동안 많은 양의 에니지원을 세포질에 비축하지 않기 때문에 발생 동안 수란관과 자궁으로부터 물질대사와 관련돼 여러 물질, 특히 에너지원을 획득해야 한다. 탄수화물은 착상전 배아의 주 에너지원으로 알려져 있다. 포도당, 젖산염, 피르

다국어 초록 (Multilingual Abstract)

Proper development of fertilized oocyte to blastocyst is a key step in mammalian development to implantation. During development of preimplantation embryos, the mammalian embryo needs supply the energy substrate for keep viability. Usually mammalian oocyte get substrate especially energy substrate from oviduct and uterus, because it does not store much substrate into cytoplasm during oogenesis. Carbohydrates are known as a main energy substrate for preimplantation stage embryos. Glucose, lactate and pyruvate are essential component in preimplantation embryo culture media and there are stage specific preferences to them. Glucose transporter and -monocarboxylate cotransporter are a main mediator for carbohydrate transport and those expression levels are primarily under the control of intrinsic or extrinsic factors like insulin and glucose. Other organic substances, amino acids, lipids and nucleotides are used as energy substance and cellular regulation factor. Though since 1960s, successful development of fertilized embryo to blastocyst has been accomplished with chemically defined medium for example BWW and give rise to normal offspring in mammals, the role of metabolites and the regulation of intermediary metabolism are still poorly understood. Glucose may permit expression of metabolic enzymes and transporters in compacting morula, capable of generating the energy required for blastocyst formation. In addition, it has been suggested that the cytokines can modulate the metabolic rate of carbohydrate in embryos and regulate the preimplantation embryonic development through control the metabolic rate. Recently we showed that lactate can be used as a mediator for preimplantation embryonic development. Those observations indicate that metabolites of carbohydrate are required by the early embryo, not only as an energy source, but also as a key substrate for other regulatory and biosynthetic pathways. In addition metabolites of carbohydrate may involve in cellular activity during development of preimplantation embryos. It is suggested that through these regulation and with other regulation mechanisms, embryo and uterus can prepare the embryo implantation and further development, properly.

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