Cited by 1,678Alzheimer's disease research and treatmentsCerebrospinal fluid and hydrocephalusNeuroinflammation and Neurodegeneration Mechanisms

Clearance systems in the brain—implications for Alzheimer disease

Open access
Tarasoff-Conway, Jenna M., Carare, Roxana O., Osorio, Ricardo S., Glodzik, Lidia, Butler, Tracy, Fieremans, Els, Axel, Leon, Rusinek, Henry +8 more·2015·Nature Reviews Neurology

Abstract

Accumulation of toxic protein aggregates-amyloid-β (Aβ) plaques and hyperphosphorylated tau tangles-is the pathological hallmark of Alzheimer disease (AD). Aβ accumulation has been hypothesized to result from an imbalance between Aβ production and clearance; indeed, Aβ clearance seems to be impaired in both early and late forms of AD. To develop efficient strategies to slow down or halt AD, it is critical to understand how Aβ is cleared from the brain. Extracellular Aβ deposits can be removed from the brain by various clearance systems, most importantly, transport across the blood-brain barrier. Findings from the past few years suggest that astroglial-mediated interstitial fluid (ISF) bulk flow, known as the glymphatic system, might contribute to a larger portion of extracellular Aβ (eAβ) clearance than previously thought. The meningeal lymphatic vessels, discovered in 2015, might provide another clearance route. Because these clearance systems act together to drive eAβ from the brain, any alteration to their function could contribute to AD. An understanding of Aβ clearance might provide strategies to reduce excess Aβ deposits and delay, or even prevent, disease onset. In this Review, we describe the clearance systems of the brain as they relate to proteins implicated in AD pathology, with the main focus on Aβ.

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Crossref · 10.1038/nrneurol.2015.119

Cites

216 of 216 references verified0 citation errors · 0 not checkable

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  • Concomitant BBB dysfunction reduces intracerebral transport of glucose and other nutrients and decreases removal of excess metabolites, thus altering homeostasis in the central nervous system.

    “The concomitant BBB dysfunction not only reduces the intracerebral transport of glucose and other nutrients,[ 10 ] but also decreases the removal of excess metabolites,[ 11 ] thus alters the homeostasis in the central nervous system (CNS).”

    From Multifunctional Nanostructure RAP‐RL Rescues Alzheimer's Cognitive Deficits through Remodeling the Neurovascular Unit (2021) · cites this paper as [11]

    The “Factors impairing amyloid-β clearance in AD” subsection (page unavailable) says that BBB clearance of amyloid-β is impaired in AD, including through reduced expression of efflux transporters. This supports decreased removal of a specific brain protein, but does not establish reduced removal of excess metabolites generally. The glucose-and-nutrient clause is attributed to citation [10], not this source. (LLM, conf=0.83)

    Experimental — accuracy not yet measured
  • RAP specifically binds to RAGE overexpressing on the endothelium of Alzheimer's disease cerebral vasculature, causing RAP-RL accumulation along the cerebral microvasculature.

    “The major reason for the accumulation of RAP‐RL along the cerebral microvasculature lies in that a key component of the nanostructure, RAP, a peptide derived from RAGE's nature ligand S100P, can specifically bind to RAGE overexpressing on the endothelium of AD cerebral vasculature.[ 15 , 38 ]”

    From Multifunctional Nanostructure RAP‐RL Rescues Alzheimer's Cognitive Deficits through Remodeling the Neurovascular Unit (2021) · cites this paper as [15]

    The 'Factors impairing amyloid-β clearance in AD' passage under Blood-brain barrier clearance states that RAGE expression is upregulated in AD. It does not address RAP, its derivation from S100P, specific RAP–RAGE binding, or RAP-RL accumulation along cerebral microvasculature. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • Expression of AQP4 on astrocytic endfeet decreases and their perivascular polarization is inhibited in Alzheimer's disease, ultimately leading to lymphatic clearance dysfunction.

    “Moreover, the expression of AQP4 on astrocytic endfeet decrease and their perivascular polarization is inhibited, ultimately leading to lymphatic clearance dysfunction.[ 11 , 43 ]”

    From Multifunctional Nanostructure RAP‐RL Rescues Alzheimer's Cognitive Deficits through Remodeling the Neurovascular Unit (2021) · cites this paper as [11]

    In “Clearance of amyloid-β > Interstitial fluid bulk-flow clearance” (page unavailable), the paper says AQP4 expression could decrease in AD and that AQP4-dependent glymphatic clearance is important for Aβ removal. It reports mislocalization of AQP4 away from perivascular endfeet in traumatic brain injury, not as an established finding in AD. It also does not establish that these changes ultimately cause lymphatic clearance dysfunction in AD. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • An important clearance pathway for cerebral Aβ is steady transport across the blood-brain barrier.

    “An important clearance pathway for cerebral Aβ is the steady transport across the blood–brain barrier (BBB) [11].”
  • RAP, a peptide derived from RAGE's natural ligand S100B, can bind RAGE effectively.

    “RAP, a peptide derived from RAGE's nature ligand, S100B, can bind RAGE effectively.[ 15 ]”

    From Multifunctional Nanostructure RAP‐RL Rescues Alzheimer's Cognitive Deficits through Remodeling the Neurovascular Unit (2021) · cites this paper as [15]

    The Blood-brain barrier clearance section discusses RAGE-mediated transport of amyloid-β, but does not address RAP or S100B. Searches for a RAP peptide derived from S100B and for S100B as a RAGE ligand found no passage about the claimed peptide binding. (LLM, conf=0.76)

    Experimental — accuracy not yet measured

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Research works printed but not linked: 3

  1. [47]de Leon MJ Jucker M Alzheimer: 100 Years and Beyond Illness 2006 1st edn Springer 385 390
  2. [74]Milford H Cushing H Studies in Intracranial Physiology and Surgery 1926 1st edn Oxford University Press 1 50 Ch. 1
  3. [76]Fenstermacher J Patlak C Cserr H Fluid Environment of the Brain 1975 1st edn Academic Press 201 214 Ch. 12

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Authors
Tarasoff-Conway, J. M., Carare, R. O., Osorio, R. S., Glodzik, L., Butler, T., Fieremans, E., Axel, L., Rusinek, H., Nicholson, C., Zlokovic, B. V., Frangione, B., Blennow, K., Ménard, J., Zetterberg, H., Wisniewski, T., & de Leon, M. J.
Affiliations
  • New York University (US)
  • Southampton General Hospital (GB)
  • NYU Langone Health (US)
  • University of Gothenburg (SE)
  • Université Paris Descartes (FR)
Venue
Nature Reviews Neurology
Published
2015-07-21
Volume
11
Issue
8
Pages
457-470
ISSN
  • 1759-4758 (ISSN-L)
  • 1759-4766
OpenAlex
W1767010801
Cited by
1,678
References
216
Citations by year
2026: 165 · 2025: 178 · 2024: 190 · 2023: 163 · 2022: 184 · 2021: 183 · 2020: 162 · 2019: 137 · 2018: 118 · 2017: 129 · 2016: 53 · 2015: 15
FWCI
12.83
Type
journal article
Language
en
Update notices
erratum (2016-03-29)
Open access
Locations
  • Nature Reviews Neurology (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • UCL Discovery (University College London) (submittedVersion)
Funders
  • National Institute on Aging (AG008051, AG022374, R01AG022374, AG20245, AG 12101, R01AG012101, P30AG008051, R01AG020245, R01AG013616, AG 13616)
  • National Heart, Lung, and Blood Institute (HL118624, R01HL118624, HL111724, R01HL111724)
  • National Institute of Neurological Disorders and Stroke (NS028642, R01NS028642)
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Cerebrospinal fluid and hydrocephalus
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
Keywords
Alzheimer's disease, amyloid-beta clearance, glymphatic system, meningeal lymphatic vessels, blood-brain barrier, astrocytes, tau hyperphosphorylation, amyloid plaques, brain waste clearance
MeSH terms
Alzheimer Disease, Blood-Brain Barrier, Brain, Cerebrospinal Fluid Proteins, Humans, Lymphatic System, Risk Factors, Biomarkers, Amyloid beta-Peptides, tau Proteins, Extracellular Fluid, Proteolysis, Absorption, Physiological

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