α-tocopherol transfer protein is important for the normal development of placental labyrinthine trophoblasts in mice

Kou Ichi Jishage, Makoto Arita, Keiji Igarashi, Takamitsu Iwata, Miho Watanabe, Masako Ogawa, Otoya Ueda, Nobuo Kamada, Keizo Inoue, Hiroyuki Arai, Hiroshi Suzuki

研究成果: Article査読

154 被引用数 (Scopus)

抄録

α-Tocopherol transfer protein (α-TTP), a cytosolic protein that specifically binds α-tocopherol, is known as a product of the causative gene in patients with ataxia that is associated with vitamin E deficiency. Targeted disruption of the α-TTP gene revealed that α-tocopherol concentration in the circulation was regulated by α-TTP expression levels. Male α-TTP-/- mice were fertile; however, placentas of pregnant α-TTP-/- females were severely impaired with marked reduction of labyrinthine trophoblasts, and the embryos died at mid-gestation even when fertilized eggs of α-TTP+/+ mice were transferred into α-TTP-/- recipients. The use of excess α-tocopherol or a synthetic antioxidant (BO-653) dietary supplement by α-TTP-/- females prevented placental failure and allowed full-term pregnancies. In α-TTP+/+ animals, α-TTP gene expression was observed in the uterus, and its level transiently increased after implantation (4.5 days postcoitum). Our results suggest that oxidative stress in the labyrinth region of the placenta is protected by vitamin E during development and that in addition to the hepatic α-TTP, which governs plasma α-tocopherol level, the uterine α-TTP may also play an important role in supplying this vitamin.

本文言語English
ページ(範囲)1669-1672
ページ数4
ジャーナルJournal of Biological Chemistry
276
3
DOI
出版ステータスPublished - 2001 1 19
外部発表はい

ASJC Scopus subject areas

  • 生化学
  • 分子生物学
  • 細胞生物学

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