Induction of apoptotic change in the rat hippocampus caused by ferric nitrilotriacetate

Shigeru Maeda, Yukiko Arai, Hitoshi Higuchi, Yumiko Tomoyasu, Ryuichiro Mizuno, Toru Takahashi, Takuya Miyawaki

Research output: Contribution to journalArticle

Abstract

Iron, a source of oxidative stress, plays a major role in the pathology of neurodegenerative disease. In Alzheimer's disease, the hippocampus is vulnerable to oxidative stress, leading to impairment in memory formation. In our previous study, a brain oxidative reaction was induced after intraperitoneal injection of ferric nitrilotriacetate (Fe-NTA). However, since only a small amount of iron reached the brain in the previous study, Fe-NTA was administered into the hippocampus using an osmotic pump in this study. After continuous injection of Fe-NTA for 2 weeks, a high level of apoptotic change was induced in the hippocampus, in accordance with the iron localization. After injection for 4 weeks, the hippocampus was totally destroyed. A small amount of iron infiltrated into the cerebral cortex and the striatum, and deposition was observed at the choroid plexus and ependymal cells. However, no apoptotic reaction or clear tissue injury was observed in these areas. In addition, muscarinic acetylcholine receptors (M1, M2, and M4) were decreased in both the cortex and hippocampus while it increased in the striatum. Thus, the hippocampus is likely vulnerable to oxidative stress from Fe-NTA, and the oxidative stress is considered to bring the disturbance in the muscarinic acetylcholine receptors.

Original languageEnglish
Pages (from-to)114-120
Number of pages7
JournalRedox Report
Volume16
Issue number3
DOIs
Publication statusPublished - Jul 2011

Keywords

  • Acetylcholine receptor
  • Ferric oxidative stress
  • Hippocampus
  • Iron

ASJC Scopus subject areas

  • Biochemistry
  • Physiology
  • Clinical Biochemistry
  • Cell Biology
  • Biochemistry, medical

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