Brooks, J, Everett, J, Lermyte, F, Tjhin, VT, Banerjee, S, O'Connor, PB, Morris, CM, Sadler, PJ, Telling, ND and Collingwood, JF (2020) Label-Free Nanoimaging of Neuromelanin in the Brain by Soft X-ray Spectromicroscopy. Angew Chem Int Ed Engl. ISSN 1521-3773

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A hallmark of Parkinson's disease is the death of neuromelanin-pigmented neurons, but the role of neuromelanin is unclear. The in situ characterization of neuromelanin remains dependent on detectable pigmentation, rather than direct quantification of neuromelanin. We show that direct, label-free nanoscale visualization of neuromelanin and associated metal ions in human brain tissue can be achieved using synchrotron scanning transmission x-ray microscopy (STXM), through a characteristic feature in the neuromelanin x-ray absorption spectrum at 287.4 eV that is also present in iron-free and iron-laden synthetic neuromelanin. This is confirmed in consecutive brain sections by correlating STXM neuromelanin imaging with silver nitrate-stained neuromelanin. Analysis suggests that the 1s-σ* (C-S) transition in benzothiazine groups accounts for this feature. This method illustrates the wider potential of STXM as a label-free spectromicroscopy technique applicable to both organic and inorganic materials.

Item Type: Article
Additional Information: © 2020 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Uncontrolled Keywords: iron; neuromelanin; Parkinson's disease; synchrotron imaging; x-ray absorption spectroscopy
Subjects: Q Science > Q Science (General)
R Medicine > R Medicine (General)
R Medicine > RC Internal medicine > RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry
R Medicine > RC Internal medicine > RC346 Neurology. Diseases of the nervous system, including speech disorders
Divisions: Faculty of Medicine and Health Sciences > School of Pharmacy and Bioengineering
Related URLs:
Depositing User: Symplectic
Date Deposited: 22 Jun 2020 11:26
Last Modified: 22 Jun 2020 11:26

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