Mitochondrial Ferritin Protects Hydrogen Peroxide-Induced Neuronal Cell Damage.

Abstract:

:Oxidative stress and iron accumulation are tightly associated with neurodegenerative diseases. Mitochondrial ferritin (FtMt) is identified as an iron-storage protein located in the mitochondria, and its role in regulation of iron hemeostasis in neurodegenerative diseases has been reported. However, the role of FtMt in hydrogen peroxide (H2O2)-induced oxidative stress and iron accumulation in neuronal cells has not been studied. Here, we overexpressed FtMt in neuroblastoma SH-SY5Y cells and induced oxidative stress by treating with extracellular H2O2. We found that overexpression of FtMt significantly prevented cell death induced by H2O2, particularly the apoptosis-dependent cell death. The protective effects involved inhibiting the generation of cellular reactive oxygen species, sustaining mitochondrial membrane potential, maintaining the level of anti-apoptotic protein Bcl-2, and inhibiting the activation of pro-apoptotic protein caspase 3. We further explored the mechanism of these protective effects and found that FtMt expression markedly altered iron homeostasis of the H2O2 treated cells as compared to that of controls. The FtMt overexpression significantly reduced cellular labile iron pool (LIP) and protected H2O2-induced elevation on LIP. While in H2O2 treated SH-SY5Y cells, the increased iron uptake and reduced iron release, in correlation with levels of DMT1(-IRE) and ferroportin 1, resulted in heavy iron accumulation, the FtMt overexpressing cells didn't show any significant changes in levels of iron transport proteins and in the level of LIP. These results implicate a neuroprotective role of FtMt on H2O2-induced oxidative stress, which may provide insights into the treatment of iron accumulation associated neurodegenerative diseases.

journal_name

Aging Dis

journal_title

Aging and disease

authors

Gao G,Zhang N,Wang YQ,Wu Q,Yu P,Shi ZH,Duan XL,Zhao BL,Wu WS,Chang YZ

doi

10.14336/AD.2016.1108

subject

Has Abstract

pub_date

2017-07-21 00:00:00

pages

458-470

issue

4

issn

2152-5250

pii

ad-8-4-458

journal_volume

8

pub_type

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