Cited by 546Alzheimer's disease research and treatmentsDementia and Cognitive Impairment ResearchNeuroinflammation and Neurodegeneration Mechanisms

Alzheimer's disease as homeostatic responses to age-related myelin breakdown

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Bartzokis, George·2011·Neurobiology of Aging

Abstract

The amyloid hypothesis (AH) of Alzheimer's disease (AD) posits that the fundamental cause of AD is the accumulation of the peptide amyloid beta (Aβ) in the brain. This hypothesis has been supported by observations that genetic defects in amyloid precursor protein (APP) and presenilin increase Aβ production and cause familial AD (FAD). The AH is widely accepted but does not account for important phenomena including recent failures of clinical trials to impact dementia in humans even after successfully reducing Aβ deposits. Herein, the AH is viewed from the broader overarching perspective of the myelin model of the human brain that focuses on functioning brain circuits and encompasses white matter and myelin in addition to neurons and synapses. The model proposes that the recently evolved and extensive myelination of the human brain underlies both our unique abilities and susceptibility to highly prevalent age-related neuropsychiatric disorders such as late onset AD (LOAD). It regards oligodendrocytes and the myelin they produce as being both critical for circuit function and uniquely vulnerable to damage. This perspective reframes key observations such as axonal transport disruptions, formation of axonal swellings/sphenoids and neuritic plaques, and proteinaceous deposits such as Aβ and tau as by-products of homeostatic myelin repair processes. It delineates empirically testable mechanisms of action for genes underlying FAD and LOAD and provides "upstream" treatment targets. Such interventions could potentially treat multiple degenerative brain disorders by mitigating the effects of aging and associated changes in iron, cholesterol, and free radicals on oligodendrocytes and their myelin.

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Crossref · 10.1016/j.neurobiolaging.2009.08.007

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  • Disturbances in myelin are associated with an increased rate of AD progression and byproducts of homeostatic myelin maintenance can promote the formation of amyloid plaques.

    “Consistent with this possibility, disturbances in myelin have been associated with an increased rate of AD progression and byproducts of homeostatic myelin maintenance can promote the formation of amyloid plaques (Bartzokis, 2007, 2011).”

    From Down Syndrome Developmental Brain Transcriptome Reveals Defective Oligodendrocyte Differentiation and Myelination (2016) · cites this paper as Bartzokis, 2011

    Section 2.2 associates more severe myelin damage with the trajectory of decline into AD, but does not establish that myelin disturbances increase the rate of progression. Section 5 proposes that Aβ released during unsuccessful myelin repair could contribute to a mature neuritic plaque, supporting the claim's qualified plaque-formation mechanism. Page numbers were not available in our copy. (LLM, conf=0.85)

    Experimental — accuracy not yet measured
  • Myelin damage likely precedes and contributes to amyloid plaque buildup in early AD.

    “This is notable because myelin damage likely precedes and contributes to amyloid plaque buildup in early AD.55–57”
  • Aβ load correlates better with age than disease severity in AD.

    “the Aβ load, which has been our main target, correlates better with age than disease severity in AD [291,292,293]”

    From Ageing, Cellular Senescence and Neurodegenerative Disease (2018) · cites this paper as [291]

  • Age-associated myelin breakdown is seen in MRI scans of patients from age 50 on, which is accentuated in APOE4 patients.

    “Age-associated myelin breakdown is seen in MRI scans of patients from age 50 on, which is accentuated in APOE4 patients (Scheltens et al. , 1992; Bartzokis, 2011).”
  • MRI data indicate that individuals with the APOEε4 risk allele have accentuated myelin breakdown in AD.

    “magnetic resonance imaging (MRI) data indicate that individuals with the risk allele APOEε4 have accentuated myelin breakdown in AD [128, 129].”

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Research works printed but not linked: 24

  1. Abe K Fujimura H Kobayashi Y Fujita N Yanagihara T Degeneration of the pyramidal tracts in patients with amyotrophic lateral sclerosis. A premortem and postmortem magnetic resonance imaging study J. Neuroimaging 1997 7 208 212 9344001
  2. Bartzokis G Cummings JL Sultzer D Henderson VW Nuechterlein KH Mintz J White matter structural integrity in healthy aging adults and patients with alzheimer disease:a magnetic resonance imaging study Arch. Neurol 2003a 60 393 398 12633151
  3. Bartzokis G Brain myelination in prevalent neuropsychiatric developmental disorders: primary and comorbid addiction Adolescent Psychiatry 2005 29 55 96 18668184 PMC2490819
  4. Bartzokis G Lu PH Geschwind DH Edwards N Mintz J Cummings JL Apolipoprotein e genotype and age-related myelin breakdown in healthy individuals: implications for cognitive decline and dementia Arch. Gen. Psychiatry 2006a 63 63 72 16389198
  5. Bartzokis G Lu PH Tishler TA Perlman S Sigel A Sigel H Sigel RKO In vivo assessment of iron in huntington’s disease and other age-related degenerative brain diseases Metal Ions in Life Sciences 2006b vol. 1 Chichester Wiley & Sons 151 177
  6. Bartzokis G Lu PH Squire LR Brain volume: age-related changes Encyclopedia of Neuroscience 2009 vol. 2 Oxford Academic Press 417 447
  7. Finch CE A perspective on sporadic inclusion-body myositis: the role of aging and inflammatory processes Neurology 2006 66 S1 S6 16432135
  8. Franklin RJ Kotter MR The biology of cns remyelination: the key to therapeutic advances J. Neurol 2008 255 Suppl. 1 19 25 18317673
  9. Ho BC Andreasen NC Nopoulos P Arndt S Magnotta V Flaum M Progressive structural brain abnormalities and their relationship to clinical outcome: a longitudinal magnetic resonance imaging study early in schizophrenia Arch. Gen. Psychiatry 2003 60 585 594 12796222
  10. Kemper T Albert M Knoefel J Neuroanatomical and neuropathological changes during aging and dementia Clinical Neurology of Aging 1994 2nd Edition New York Oxford University Press 3 67
  11. Klintworth GK Barbeau A Paulson GW Chase TN Huntington’s chorea—morphologic contributions of a century Advances in Neurology, v. 1: Huntington’s Chorea, 1872–1972 1973 New York Raven Press 353 368
  12. Kornek B Storch MK Weissert R Wallstroem E Stefferl A Olsson T Linington C Schmidbauer M Lassmann H Multiple sclerosis and chronic autoimmune encephalomyelitis: a comparative quantitative study of axonal injury in active, inactive, and remyelinated lesions Am. J. Pathol 2000 157 267 276 10880396 PMC1850217
  13. Meyer A Paul flechsig’s system of myelogenetic cortical localization in the light of recent research in neuroanatomy and neurophysiology part ii Can. J. Neurol. Sci 1981b 8 95 104 7028235
  14. Morell P Toews AD Norton WT In vivo metabolism of oligodendroglial lipids Oligodendroglia 1984 New York Plenium Press 47 86
  15. Nieuwenhuys R Nieuwenhuys R Tendokelaar JH Nicholson C Structure and organization of fibre systems (chapter 3) The Central Nervous System of Vertebrates 1999 vol. 1 Berlin Springer 113 157
  16. Patton RL Kalback WM Esh CL Kokjohn TA Van Vickle GD Luehrs DC Kuo YM Lopez J Brune D Ferrer I Masliah E Newel AJ Beach TG Castano EM Roher AE Amyloid-beta peptide remnants in an-1792-immunized alzheimer’s disease patients: a biochemical analysis Am. J. Pathol 2006 169 1048 1063 16936277 PMC1698828
  17. Quintanilla RA Jin YN Fuenzalida K Bronfman M Johnson GV Rosiglitazone treatment prevents mitochondrial dysfunction in mutant huntingtin expressing cells: possible role of ppargamma in the pathogenesis of huntington disease J. Biol. Chem 2008 PMC2533094 18640979
  18. Sanchez I Hassinger L Sihag RK Cleveland DW Mohan P Nixon RA Local control of neurofilament accumulation during radial growth of myelinating axons in vivo. Selective role of site-specific phosphorylation J. Cell Biol 2000 151 1013 1024 11086003 PMC2174358
  19. Schmidt R Schmidt H Fazekas F Schumacher M Niederkorn K Kapeller P Weinrauch V Kostner GM Apolipoprotein e polymorphism and silent microangiopathy-related cerebral damage. Results of the austrian stroke prevention study Stroke 1997 28 951 956 9158631
  20. Walker LC Cork LC Terry RD Katzman R Bick KL Sisodia SS The neurobiology of aging in non-human primates Alzheimer’s Disease 1999 Philadelphia Lippincott, Williams and Wilkins 233 243
  21. Wen Y Planel E Herman M Figueroa HY Wang L Liu L Lau LF Yu WH Duff KE Interplay between cyclin-dependent kinase 5 and glycogen synthase kinase 3beta mediated by neuregulin signaling leads to differential effects on tau phosphorylation and amyloid precursor protein processing J. Neurosci 2008 28 2624 2632 18322105 PMC6671193
  22. Wolfe MS When loss is gain: reduced presenilin proteolytic function leads to increased abeta42/abeta40. Talking point on the role of presenilin mutations in alzheimer disease EMBO Rep 2007 8 136 140 17268504 PMC1796780
  23. Wood P Bunger RP Norton WT The biology of the oligodendrocyte Oligodendroglia 1984 New York Plenum Press 1 46
  24. Yin YI Bassit B Zhu L Yang X Wang C Li YM {gamma}-secretase substrate concentration modulates the abeta42/abeta40 ratio: implications for alzheimer disease J. Biol. Chem 2007 282 23639 23644 17556361

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Authors
Bartzokis, G.
Affiliations
University of California, Los Angeles (US)
Corresponding author
Bartzokis, George
Venue
Neurobiology of Aging
Publisher
Elsevier BV
Published
2011-08
Volume
32
Issue
8
Pages
1341-1371
ISSN
0197-4580 (ISSN-L)
OpenAlex
W2130418945
Cited by
546
References
411
Citations by year
2026: 27 · 2025: 39 · 2024: 23 · 2023: 41 · 2022: 38 · 2021: 33 · 2020: 43 · 2019: 31 · 2018: 31 · 2017: 34 · 2016: 40 · 2015: 36 · 2014: 31 · 2013: 31 · 2012: 31
FWCI
2.43
Type
journal article
Language
en
Open access
Locations
  • Neurobiology of Aging (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institute on Aging (R01AG027342, AG027342)
  • National Institute of Mental Health (MH066029, R01MH066029)
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, amyloid hypothesis, amyloid-beta, myelination, oligodendrocytes, remyelination, white matter, axonal transport, neuritic plaques, tau protein, amyloid precursor protein, presenilin, familial Alzheimer's disease, late-onset Alzheimer's disease, brain aging, iron, cholesterol, free radicals, treatment goals
MeSH terms
Aged, Aging, Alzheimer Disease, Homeostasis, Humans, Myelin Sheath, Oligodendroglia

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