Glutathione depletion results in S-nitrosylation of protein disulfide isomerase in neuroblastoma cells

Shinji Ono, Jiro Ogura, Hiroki Sugiura, Minami Yamauchi, Atsushi Tanaka, Toshihiro Sato, Masamitsu Maekawa, Hiroaki Yamaguchi, Nariyasu Mano

研究成果: Article査読


Aims: Protein disulfide isomerase (PDI) is an essential enzyme involved in oxidative protein folding. PDI is S-nitrosylated in the brains of Alzheimer's disease patients, and S-nitrosylated PDI is considered one of main causes of Alzheimer's disease. However, the mechanisms underlying PDI S-nitrosylation have not yet been elucidated. Because glutathione (GSH) depletion is a pathological feature of Alzheimer's disease, we investigated the effect of GSH depletion on the S-nitrosylation level of PDI. Main methods: SH-SY5Y cells, which is a human derived neuroblastoma cells, were used in this study. Glutamate and buthionine sulfoximine (BSO) were used as GSH depletors. S-nitrosylated PDI was detected by biotin-switch assay. Key findings: GSH depletion by glutamate, a cystine/glutamate antiporter xCT inhibitor, increased S-nitrosylated PDI at C343 in SH-SY5Y cells, and induced IRE1α phosphorylation. BSO, a γ-glutamylcysteine synthetase inhibitor, also increased S-nitrosylated PDI and phosphorylated IRE1α upon GSH depletion. Because S-nitrosylated PDI at C343 is stable in neuro cells, S-nitrosylated PDI by GSH depletion progresses to neurodegeneration by the induction of endoplasmic reticulum stress via phosphorylated IRE1α signaling from the early to late stage. Furthermore, treatment with neohesperidin, but not N-acetylcysteine (NAC), improved PDI S-nitrosylation level in GSH-depleted SH-SY5Y cells because nitrosylated compound of NAC induces PDI S-nitrosylation. Significance: The results of our study provide a new insight into the mechanisms of neurodegeneration, and may be useful for the development of drugs for Alzheimer's diseases.

ジャーナルLife Sciences
出版ステータスPublished - 2023 3月 1

ASJC Scopus subject areas

  • 生化学、遺伝学、分子生物学(全般)
  • 薬理学、毒性学および薬学(全般)


「Glutathione depletion results in S-nitrosylation of protein disulfide isomerase in neuroblastoma cells」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。