Abstract
The possible role of iron in neurodegeneration may be related to the oxidative stress, triggered by Fenton reaction. In this reaction hydroxyl free radical production is generated by divalent iron. Motor symptoms of Parkinson’s disease depend on the destruction of substantia nigra (SN). As the substantive questions were: 1/ what is the concentration of iron in the samples, 2/ what is the proportion of divalent vs. trivalent iron in the samples, and 3/ what is the iron-binding compound, it seemed appropriate to use Mössbauer spectroscopy to answer those questions. We found no difference in the concentration of total iron between PD and control, with the ratio of iron in PD vs. control being 1.00 ± 0.13. The divalent iron could not exceed 5% of the total iron. The main iron-binding compound in SN, both in PD and control is ferritin. Our further studies of ferritin in parkinsonian SN demonstrated a decrease, compared to control, of L-ferritin involved in the storage of iron within ferritin. This could allow an efflux of iron from the ferritin shell and an increase of non-ferritin iron in PD SN, which was confirmed by us. Mössbauer studies in Alzheimer showed slightly higher concentration of iron in hippocampal cortex with significantly higher concentrations of L and H ferritins compared to control. In atypical parkinsonism, progressive supranuclear palsy, higher concentration of iron was found in globus pallidus and SN compared to control. Mössbauer spectroscopy may play crucial role in further studies of human neurodegeneration.
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This article is part of the Topical Collection on Proceedings of the 3rd Mediterranean Conference on the Applications of the Mössbauer Effect (MECAME 2017), Jerusalem, Israel, 5–7 June 2017
Edited by Mira Ristic, Stjepko Krehula, Israel Nowik and Israel Felner
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Friedman, A., Galazka-Friedman, J. Mössbauer spectroscopy and the understanding of the role of iron in neurodegeneration. Hyperfine Interact 238, 62 (2017). https://doi.org/10.1007/s10751-017-1433-7
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DOI: https://doi.org/10.1007/s10751-017-1433-7