Role of α-tocopherol in the regulation of mitochondrial permeability transition

Masae Yorimitsu, Shikibu Muranaka, Eisuke F. Sato, Hirofumi Fujita, Kouichi Abe, Tatsuji Yasuda, Masayasu Inoue, Kozo Utsumi


8 被引用数 (Scopus)


We previously showed that Ca2+-induced cyclosporin A-sensitive membrane permeability transition (MPT) of mitochondria occurred with concomitant generation of reactive oxygen species (ROS) and release of cytochrome c (Free Rad. Res.38, 29-35, 2004). To elucidate the role of α-tocopherol in MPT, we investigated the effect of α-tocopherol on mitochondrial ROS generation, swelling and cytochrome c release induced by Ca2+ or hydroxyl radicals. Biochemical analysis revealed that α-tocopherol suppressed Ca2+-induced ROS generation and oxidation of critical thiol groups of mitochondrial adenine nucleotide translocase (ANT) but not swelling and cytochrome c release. Hydroxyl radicals also induced cyclosporin A-sensitive MPT of mitochondria. α-Tocopherol suppressed the hydroxyl radical-induced lipid peroxidation, swelling and cytochrome c release from mitochondria. These results indicate that α-tocopherol inhibits ROS generation, ANT oxidation, lipid peroxidation and the opening of MPT, thereby playing important roles in the prevention of oxidative cell death.

ジャーナルPhysiological chemistry and physics and medical NMR
出版ステータスPublished - 2004

ASJC Scopus subject areas

  • 生物理学
  • 生化学
  • 生理学
  • 分光学


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