Intranasal administration of $\alpha$-synuclein preformed fibrils triggers microglial iron deposition in the substantia nigra of Macaca fascicularis - Archive ouverte HAL Access content directly
Journal Articles Cell Death and Disease Year : 2021

Intranasal administration of $\alpha$-synuclein preformed fibrils triggers microglial iron deposition in the substantia nigra of Macaca fascicularis

(1) , (2) , (1) , (3) , (4) , (4) , (1) , (5) , (3, 6) , (1) , (2) , (1) , (1)
1
2
3
4
5
6

Abstract

Iron deposition is present in main lesion areas in the brains of patients with Parkinson's disease (PD) and an abnormal iron content may be associated with dopaminergic neuronal cytotoxicity and degeneration in the substantia nigra of the midbrain. However, the cause of iron deposition and its role in the pathological process of PD are unclear. In the present study, we investigated the effects of the nasal mucosal delivery of synthetic human α-synuclein (α-syn) preformed fibrils (PFFs) on the pathogenesis of PD in Macaca fascicularis. We detected that iron deposition was clearly increased in a time-dependent manner from 1 to 17 months in the substantia nigra and globus pallidus, highly contrasting to other brain regions after treatments with α-syn PFFs. At the cellular level, the iron deposits were specifically localized in microglia but not in dopaminergic neurons, nor in other types of glial cells in the substantia nigra, whereas the expression of transferrin (TF), TF receptor 1 (TFR1), TF receptor 2 (TFR2), and ferroportin (FPn) was increased in dopaminergic neurons. Furthermore, no clear dopaminergic neuron loss was observed in the substantia nigra, but with decreased immunoreactivity of tyrosine hydroxylase (TH) and appearance of axonal swelling in the putamen. The brain region-enriched and cell-type-dependent iron localizations indicate that the intranasal α-syn PFFs treatment-induced iron depositions in microglia in the substantia nigra may appear as an early cellular response that may initiate neuroinflammation in the dopaminergic system before cell death occurs. Our data suggest that the inhibition of iron deposition may be a potential approach for the early prevention and treatment of PD.

Keywords

Fichier principal
Vignette du fichier
s41419-020-03369-x.pdf (4.45 Mo) Télécharger le fichier
Origin : Publisher files allowed on an open archive

Dates and versions

cea-03116047 , version 1 (20-01-2021)

Licence

Attribution - CC BY 4.0

Identifiers

Cite

Jian-Jun Guo, Feng Yue, Dong-Yan Song, Luc Bousset, Xin Liang, et al.. Intranasal administration of $\alpha$-synuclein preformed fibrils triggers microglial iron deposition in the substantia nigra of Macaca fascicularis. Cell Death and Disease, 2021, 12, pp.1-14. ⟨10.1038/s41419-020-03369-x⟩. ⟨cea-03116047⟩
18 View
34 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More