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Proinflammatory and amyloidogenic S100A9 induced by traumatic brain injury in mouse model
Umeå University, Faculty of Medicine, Department of Medical Biochemistry and Biophysics.ORCID iD: 0000-0001-7505-8045
Umeå University, Faculty of Medicine, Department of Medical Biochemistry and Biophysics.ORCID iD: 0000-0002-1691-9025
Umeå University, Faculty of Medicine, Department of Medical Biochemistry and Biophysics.
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2019 (English)In: Neuroscience Letters, ISSN 0304-3940, E-ISSN 1872-7972, Vol. 699, p. 199-205Article in journal (Refereed) Published
Abstract [en]

Traumatic brain injury (TBI) represents a significant risk factor for development of neurodegenerative diseases such as Alzheimer's and Parkinson's. The S100A9-driven amyloid-neuroinflammatory cascade occurring during primary and secondary TBI events can serve as a mechanistic link between TBI and Alzheimer's as demonstrated recently in the human brain tissues. Here by using immunohistochemistry in the controlled cortical impact TBI mouse model we have found pro-inflammatory S100A9 in the brain tissues of all mice on the first and third post- TBI days, while 70% of mice did not show any S100A9 presence on seventh post-TBI day similar to controls. This indicates that defensive mechanisms effectively cleared S100A9 in these mouse brain tissues during post-TBI recovery. By using sequential immunohistochemistry we have shown that S100A9 was produced by both neuronal and microglial cells. However, A beta peptide deposits characteristic for Alzheimer's disease were not detected in any post-TBI animals. On the first and third post-TBI days S100A9 was found to aggregate intracellularly into amyloid oligomers, similar to what was previously observed in human TBI tissues. Complementary, by using Rayleigh scatting, intrinsic fluorescence and atomic force microscopy we demonstrated that in vitro S100A9 self- assembles into amyloid oligomers within minutes. Its amyloid aggregation is highly dependent on changes of environmental conditions such as variation of calcium levels, pH, temperature and reduction/oxidation, which might be relevant to perturbation of cellular and tissues homeostasis under TBI. Present results demonstrate that S100A9 induction mechanisms in TBI are similar in mice and humans, emphasizing that S100A9 is an important marker of brain injury and therefore can be a potential therapeutic target.

Place, publisher, year, edition, pages
ELSEVIER IRELAND LTD , 2019. Vol. 699, p. 199-205
Keywords [en]
Alzheimer's disease, Amyloid, Neuroinflammation, Oligomerization, S100A9, Traumatic brain injury
National Category
Neurosciences
Identifiers
URN: urn:nbn:se:umu:diva-158949DOI: 10.1016/j.neulet.2019.02.012ISI: 000465055200032PubMedID: 30753908OAI: oai:DiVA.org:umu-158949DiVA, id: diva2:1318328
Available from: 2019-05-27 Created: 2019-05-27 Last updated: 2019-05-27Bibliographically approved

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Wang, ChaoIashchishyn, IgorKara, JohnMorozova-Roche, Ludmilla

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Wang, ChaoIashchishyn, IgorKara, JohnMorozova-Roche, Ludmilla
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