cn0c00196_si_001.pdf (638.25 kB)
α‑Synuclein Regulates Iron Homeostasis via Preventing Parkin-Mediated DMT1 Ubiquitylation in Parkinson’s Disease Models
journal contribution
posted on 2020-05-21, 16:02 authored by Mingxia Bi, Xixun Du, Qian Jiao, Zhiguo Liu, Hong JiangIron metabolism imbalance
plays a key role in the neurodegeneration
of Parkinson’s disease (PD), thus iron homeostasis should be
tightly controlled by iron transporters. α-Synuclein (α-Syn)
serves as a ferrireductase and iron-binding protein, which is supposed
to be linked with iron metabolism, but little is known about how α-Syn
affects iron homeostasis in PD. Our previous findings that up-regulation
of divalent metal transporter 1 (DMT1) accounted for the nigral iron
accumulation in PD raised the question whether α-Syn disturbed
iron homeostasis by modulating DMT1 expression. Using α-Syn
overexpressed SH-SY5Y cells and mutant human A53T α-Syn transgenic
mice, we found that α-Syn could up-regulate DMT1 protein levels,
followed by enhanced ferrous iron influx and subsequent aggravated
oxidative stress injury. Mechanistic studies identified that α-Syn-induced
p38 mitogen-activated protein kinase (MAPK) activation phosphorylated
parkin at Ser131, which inactivated parkin’s E3 ubiquitin ligase
activity and further reduced DMT1 ubiquitylation level. Our findings
revealed that α-Syn affected brain iron homeostasis through
modulating DMT1 protein stability and altering cellular iron uptake,
which might provide direct evidence for the involvement of α-Syn
in iron metabolism dysfunction and provide insight into PD-associated
nigral iron deposition.
History
Usage metrics
Categories
Keywords
nigral iron accumulationferrous iron influxPreventing Parkin-Mediated DMT 1 Ubiquitylationactivation phosphorylated parkinup-regulate DMT 1 protein levelsiron homeostasisDMT 1 ubiquitylation leveldivalent metal transporter 1iron metabolism dysfunctionbrain iron homeostasisα- Syn-induced p 38 mitogen-activated protein kinaseα- Synmodulating DMT 1 expression53T α- Synoxidative stress injurymodulating DMT 1 protein stabilityPD-associated nigral iron depositionMAPKα- Syn overexpressed SH-SY 5Y cells
Licence
Exports
RefWorks
BibTeX
Ref. manager
Endnote
DataCite
NLM
DC