Cited by 84Alzheimer's disease research and treatmentsDementia and Cognitive Impairment ResearchNeurological diseases and metabolism

Iron Deposition Leads to Hyperphosphorylation of Tau and Disruption of Insulin Signaling

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Wan, Wenbin, Cao, Lan, Kalionis, Bill, Murthi, Padma, Xia, Shijin, Guan, Yangtai·2019·Frontiers in Neurology

Abstract

Iron deposition in the brain is an early issue in Alzheimer’s disease (AD). However, the pathogenesis of iron-induced pathological changes in AD remains elusive. Insulin resistance in brains is an essential feature of AD. Previous studies determined that insulin resistance is involved in the development of pathologies in AD. Tau pathology is one of most important hallmarks in AD and is associated with the impairment of cognition and clinical grades of the disease. In the present study, we observed that ferrous (Fe2+) chloride led to aberrant phosphorylation of tau, and decreased tyrosine phosphorylation levels of insulin receptor β (IRβ), insulin signal substrate 1 (IRS-1) and phosphoinositide 3-kinase p85α (PI3K p85α), in primary cultured neurons. In the in vivo studies using mice with supplemented dietary iron, learning and memory was impaired. As well, hyperphosphorylation of tau and disrupted insulin signaling in the brain was induced in iron-overloaded mice. Furthermore, in our in vitro work we identified the activation of insulin signaling following exogenous supplementation of insulin. This was further attenuated by iron-induced hyperphosphorylation of tau in primary neurons. Together, these data suggest that dysfunctional insulin signaling participates in iron-induced abnormal phosphorylation of tau in AD. Our study highlights the promising role of insulin signaling in pathological lesions induced by iron overloading.

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Authors
Wan, W., Cao, L., Kalionis, B., Murthi, P., Xia, S., & Guan, Y.
Affiliations
  • Shanghai Jiao Tong University (CN)
  • Shanghai Medical College of Fudan University (CN)
  • Royal Women's Hospital (AU)
  • The University of Melbourne (AU)
  • Fudan University (CN)
Corresponding author
  • Xia, Shijin
  • Guan, Yangtai
Venue
Frontiers in Neurology
Published
2019-06-19
Volume
10
Pages
607-607
ISSN
1664-2295 (ISSN-L)
OpenAlex
W2952790855
Cited by
84
References
90
Citations by year
2026: 9 · 2025: 15 · 2024: 20 · 2023: 12 · 2022: 14 · 2021: 6 · 2020: 6 · 2019: 2
FWCI
4.80
Type
journal article
Language
en
Open access
Locations
  • Frontiers in Neurology (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Minerva Access (University of Melbourne) (submittedVersion, cc-by)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • National Natural Science Foundation of China (81230027, 81771295, 81801043)
  • Shanghai Municipal Education Commission (TM201508, YS2017ZY050083)
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
  • Life Sciences › Neuroscience › Neurology › Neurological diseases and metabolism
Keywords
iron accumulation, tau hyperphosphorylation, insulin signaling, insulin resistance, Alzheimer's disease, iron overload, dietary iron supplementation, insulin receptor beta, IRS-1, PI3K p85α, learning and memory impairment, primary neurons

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