Cited by 234Alzheimer's disease research and treatmentsNeuroinflammation and Neurodegeneration MechanismsTelomeres, Telomerase, and Senescence

Tau oligomer induced HMGB1 release contributes to cellular senescence and neuropathology linked to Alzheimer’s disease and frontotemporal dementia

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Gaikwad, Sagar, Puangmalai, Nicha, Bittar, Alice, Montalbano, Mauro, Garcia, Stephanie, McAllen, Salome, Bhatt, Nemil, Sonawane, Minal +2 more·2021·Cell Reports

Abstract

Aging, pathological tau oligomers (TauO), and chronic inflammation in the brain play a central role in tauopathies, including Alzheimer's disease (AD) and frontotemporal dementia (FTD). However, the underlying mechanism of TauO-induced aging-related neuroinflammation remains unclear. Here, we show that TauO-associated astrocytes display a senescence-like phenotype in the brains of patients with AD and FTD. TauO exposure triggers astrocyte senescence through high mobility group box 1 (HMGB1) release and inflammatory senescence-associated secretory phenotype (SASP), which mediates paracrine senescence in adjacent cells. HMGB1 release inhibition using ethyl pyruvate (EP) and glycyrrhizic acid (GA) prevents TauO-induced senescence through inhibition of p38-mitogen-activated protein kinase (MAPK) and nuclear factor κB (NF-κB)-the essential signaling pathways for SASP development. Despite the developed tauopathy in 12-month-old hTau mice, EP+GA treatment significantly decreases TauO and senescent cell loads in the brain, reduces neuroinflammation, and thus ameliorates cognitive functions. Collectively, TauO-induced HMGB1 release promotes cellular senescence and neuropathology, which could represent an important common pathomechanism in tauopathies including AD and FTD.

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Authors
Gaikwad, S., Puangmalai, N., Bittar, A., Montalbano, M., Garcia, S., McAllen, S., Bhatt, N., Sonawane, M., Sengupta, U., & Kayed, R.
Affiliations
The University of Texas Medical Branch at Galveston (US)
Corresponding author
Kayed, Rakez
Venue
Cell Reports
Publisher
Elsevier BV
Published
2021-07
Volume
36
Issue
3
Pages
109419
ISSN
2211-1247 (ISSN-L)
OpenAlex
W3186179545
Cited by
234
References
109
Citations by year
2026: 49 · 2025: 55 · 2024: 52 · 2023: 43 · 2022: 28 · 2021: 6
FWCI
20.24
Type
journal article
Language
en
Open access
Locations
  • Cell Reports (publishedVersion, cc-by-nc-nd)
  • SSRN Electronic Journal (acceptedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion, cc-by-nc-nd)
Funders
  • National Institutes of Health (R01AG054025, R01AG060718, R01NS094557, RFA1AG055771)
  • American Heart Association (17CSA33620007)
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Health Sciences › Medicine › Physiology › Telomeres, Telomerase, and Senescence
Keywords
tau oligomers, HMGB1 release, cellular senescence, astrocytes, senescence-associated secretory phenotype, neuroinflammation, Alzheimer's disease, frontotemporal dementia, tauopathy, p38 MAPK, NF-κB, ethyl pyruvate, glycyrrhizin, paracrine senescence, cognitive function
MeSH terms
Alzheimer Disease, Animals, Astrocytes, Brain, Cell Nucleus, Cells, Cultured, Cognition Disorders, Humans, Mice, Inbred C57BL, Mice, Transgenic, Phenotype, Pyruvates, tau Proteins, Cellular Senescence, Glycyrrhizic Acid, Protein Transport, HMGB1 Protein, Mice, Frontotemporal Dementia

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