Targeting Fyn Kinase in Alzheimer’s Disease
Open accessAbstract
The past decade has brought tremendous progress in unraveling the pathophysiology of Alzheimer's disease (AD). While increasingly sophisticated immunotherapy targeting soluble and aggregated brain amyloid-beta (Aβ) continues to dominate clinical research in AD, a deeper understanding of Aβ physiology has led to the recognition of distinct neuronal signaling pathways linking Aβ to synaptotoxicity and neurodegeneration and to new targets for therapeutic intervention. Identifying specific signaling pathways involving Aβ has allowed for the development of more precise therapeutic interventions targeting the most relevant molecular mechanisms leading to AD. In this review, I highlight the discovery of cellular prion protein as a high-affinity receptor for Aβ oligomers, and the downstream signaling pathway elucidated to date, converging on nonreceptor tyrosine kinase Fyn. I discuss preclinical studies targeting Fyn as a therapeutic intervention in AD and our recent experience with the safety, tolerability, and cerebrospinal fluid penetration of the Src family kinase inhibitor saracatinib in patients with AD. Fyn is an attractive target for AD therapeutics, not only based on its activation by Aβ via cellular prion protein but also due to its known interaction with tau, uniquely linking the two key pathologies in AD. Fyn is also a challenging target, with broad expression throughout the body and significant homology with other members of the Src family kinases, which may lead to unintended off-target effects. A phase 2a proof-of-concept clinical trial in patients with AD is currently under way, providing critical first data on the potential effectiveness of targeting Fyn in AD.
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Saracatinib failed to demonstrate statistically significant efficacy in phase 1b and phase 2 clinical trials.
“Saracatinib failed to demonstrate statistically significant efficacy in phase 1b and phase 2 clinical trials [178].”
From Role of Tau Protein in Neurodegenerative Diseases and Development of Its Targeted Drugs: A Literature Review (2024) · cites this paper as [178]
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Flagged first, then by citations
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“Accordingly, inhibition of Fyn improved the cognitive deficits in transgenic mice with Aβ and tau depositions.(144,145) PET and CSF tests also indicate the synergy between Aβ and tau, which leads to brain dysfunction and cognitive impairment.”
BackgroundThe Amyloid-β Oligomer Hypothesis: Beginning of the Third Decade
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“Saracatinib failed to demonstrate statistically significant efficacy in phase 1b and phase 2 clinical trials [178].”
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Masitinib for the Treatment of Alzheimer’s Disease
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- Authors
- Nygaard, H. B.
- Affiliations
- University of British Columbia (CA)
- Corresponding author
- Nygaard, Haakon B.
- ORCID
- Nygaard, Haakon B.
- Venue
- Biological Psychiatry
- Publisher
- Elsevier BV
- Published
- 2018-02
- Volume
- 83
- Issue
- 4
- Pages
- 369-376
- ISSN
- 0006-3223 (ISSN-L)
- PMC
- PMC5729051
- OpenAlex
- W2625356606
- Cited by
- 162
- References
- 98
- Citations by year
- 2026: 10 · 2025: 13 · 2024: 20 · 2023: 21 · 2022: 24 · 2021: 22 · 2020: 26 · 2019: 16 · 2018: 8 · 2017: 2
- FWCI
- 1.74
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Locations
- Biological Psychiatry (publishedVersion)
- PubMed (publishedVersion)
- Europe PMC (PubMed Central) (acceptedVersion)
- PubMed Central (acceptedVersion)
- Funders
- National Institutes of Health (UH3TR000967)
- National Center for Advancing Translational Sciences
- 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 › Neuroinflammation and Neurodegeneration Mechanisms
- Keywords
- Alzheimer's disease, Fyn, Src family kinases, saracatinib, cellular prion protein, amyloid-beta oligomers, tau protein, synaptotoxicity, neurodegeneration, kinase inhibitors, cerebrospinal fluid penetration, off-target effects
- MeSH terms
- Prion Proteins, Alzheimer Disease, Animals, Enzyme Inhibitors, Humans, Quinazolines, Amyloid beta-Peptides, Proto-Oncogene Proteins c-fyn, Benzodioxoles
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
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