Nanoscale synchrotron x-ray analysis of intranuclear iron in melanised neurons of Parkinson's substantia nigra.

Autor: Brooks J; School of Engineering, Library Road, University of Warwick, Coventry, CV4 7AL, UK. Jake.Brooks@warwick.ac.uk., Everett J; School of Engineering, Library Road, University of Warwick, Coventry, CV4 7AL, UK.; School of Pharmacy and Bioengineering, Guy Hilton Research Centre, Thornburrow Drive, Keele University, Staffordshire, ST4 7QB, UK., Hill E; School of Life Sciences, Gibbet Hill Campus, University of Warwick, Coventry, CV4 7AL, UK., Billimoria K; School of Engineering, Library Road, University of Warwick, Coventry, CV4 7AL, UK., Morris CM; Newcastle Brain Tissue Resource, Institute of Neuroscience, Newcastle University, Newcastle-upon-Tyne, NE4 5PL, UK., Sadler PJ; Department of Chemistry, Library Road, University of Warwick, Coventry, CV4 7AL, UK., Telling N; School of Pharmacy and Bioengineering, Guy Hilton Research Centre, Thornburrow Drive, Keele University, Staffordshire, ST4 7QB, UK., Collingwood JF; School of Engineering, Library Road, University of Warwick, Coventry, CV4 7AL, UK.
Jazyk: angličtina
Zdroj: Communications biology [Commun Biol] 2024 Aug 20; Vol. 7 (1), pp. 1024. Date of Electronic Publication: 2024 Aug 20.
DOI: 10.1038/s42003-024-06636-1
Abstrakt: Neuromelanin-pigmented neurons of the substantia nigra are selectively lost during the progression of Parkinson's disease. These neurons accumulate iron in the disease state, and iron-mediated neuron damage is implicated in cell death. Animal models of Parkinson's have evidenced iron loading inside the nucleoli of nigral neurons, however the nature of intranuclear iron deposition in the melanised neurons of the human substantia nigra is not understood. Here, scanning transmission x-ray microscopy (STXM) is used to probe iron foci in relation to the surrounding ultrastructure in melanised neurons of human substantia nigra from a confirmed Parkinson's case. In addition to the expected neuromelanin-bound iron, iron deposits are also associated with the edge of the cell nucleolus. Speciation analysis confirms these deposits to be ferric (Fe 3+ ) iron. The function of intranuclear iron in these cells remains unresolved, although both damaging and protective mechanisms are considered. This finding shows that STXM is a powerful label-free tool for the in situ, nanoscale chemical characterisation of both organic and inorganic intracellular components. Future applications are likely to shed new light on incompletely understood biochemical mechanisms, such as metal dysregulation and morphological changes to cell nucleoli, that are important in understanding the pathogenesis of Parkinson's.
(© 2024. The Author(s).)
Databáze: MEDLINE
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