Cited by 394Alzheimer's disease research and treatmentsNeuroinflammation and Neurodegeneration MechanismsDementia and Cognitive Impairment Research

In Vivo Assessment of Brain Interstitial Fluid with Microdialysis Reveals Plaque-Associated Changes in Amyloid-β Metabolism and Half-Life

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Cirrito, John R., May, Patrick C., O'Dell, Mark A., Taylor, Jennie W., Parsadanian, Maia, Cramer, Jeffrey W., Audia, James E., Nissen, Jeffrey S. +4 more·2003·The Journal of Neuroscience

Abstract

Soluble amyloid-β (Aβ) peptide converts to structures with high β-sheet content in Alzheimer's disease (AD). Soluble Aβ is released by neurons into the brain interstitial fluid (ISF), in which it can convert into toxic aggregates. Because assessment of ISF Aβ levels may provide unique insights into Aβ metabolism and AD, an in vivo microdialysis technique was developed to measure it. Our Aβ microdialysis technique was validated ex vivo with human CSF and then in vivo in awake, freely moving mice. Using human amyloid precursor protein (APP) transgenic mice, we found that, before the onset of AD-like pathology, ISF Aβ in hippocampus and cortex correlated with levels of APP in those tissues. After the onset of Aβ deposition, significant changes in the ISF Aβ 40 /Aβ 42 ratio developed without changes in Aβ 1-x . These changes differed from changes seen in tissue lysates from the same animals. By rapidly inhibiting Aβ production, we found that ISF Aβ half-life was short (∼2 hr) in young mice but was twofold longer in mice with Aβ deposits. This increase in half-life, without an increase in steady-state levels, suggests that inhibition of Aβ synthesis reveals a portion of the insoluble Aβ pool that is in dynamic equilibrium with ISF Aβ. This now measurable in vivo pool is a likely target for new diagnostic and therapeutic strategies.

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Crossref · 10.1523/jneurosci.23-26-08844.2003

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  • The concentration of soluble Aβ in the ISF throughout life is closely associated with the amount of Aβ that ultimately deposits in the extracellular space of the brain.

    “The concentration of soluble Aβ in the ISF throughout life has been shown to be closely associated with the amount of Aβ that ultimately deposits in the extracellular space of the brain (29-31).”

    From Human ApoE isoforms differentially regulate brain amyloid-β peptide clearance (2011) · cites this paper as [29]

    The ‘Relationships between ISF Aβ, CSF Aβ, and plaque load’ section reports a trend toward correlation between hippocampal ISF Aβ and plaque load in 12- to 15-month-old PDAPP mice; Figure 5 gives p = 0.1582. This does not establish a close association throughout life or show that ISF concentration predicts the amount ultimately deposited. Our copy provides no page number for these passages. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • Soluble ISF Aβ exchangeable across a 38kDa dialysis membrane (eAβ) is tightly correlated with the levels of total soluble Aβ present in extracellular pools of the brain.

    “Soluble ISF Aβ exchangeable across a 38kDa dialysis membrane (eAβ) has previously been shown to be tightly correlated with the levels of total soluble Aβ present in extracellular pools of the brain (Cirrito et al., 2003).”

    From Overexpression of Low-Density Lipoprotein Receptor in the Brain Markedly Inhibits Amyloid Deposition and Increases Extracellular Aβ Clearance (2009) · cites this paper as Cirrito et al., 2003

    The “Characterization of Aβ in human CSF” section reports a high correlation between exchangeable Aβ and total soluble Aβ in human CSF, using a 35 kDa membrane. It does not establish that correlation for brain ISF or extracellular pools generally. The paper also describes ISF as distinct from CSF and soluble brain-tissue lysates. (LLM, conf=0.89)

    Experimental — accuracy not yet measured
  • The half-life of Aβ clearance in previous studies ranged from 30 min to 2 h.

    “The half-life of Aβ clearance in these studies ranged from 30 min to 2 h.”

    From Measurement of apolipoprotein E and amyloid β clearance rates in the mouse brain using bolus stable isotope labeling (2012) · cites this paper as [49]

    The Results section ('Half-life of Aβ in the brain interstitial fluid'; page unavailable) reports an ISF Aβ half-life of 1.97 hours in young mice, supporting the 2-hour figure. It does not report a 30-minute half-life; it also reports 3.78 hours in aged mice, so the stated range does not describe this paper's findings. (LLM, conf=0.87)

    Experimental — accuracy not yet measured
  • Soluble ISF Aβ closely reflects extracellular pools of Aβ.

    “Because soluble ISF Aβ has been shown to closely reflect extracellular pools of Aβ (29-31)”
  • Previous studies have measured Aβ clearance from the brain either using 35S]methionine labeling or by measuring the disappearance of Aβ following the pharmacological inhibition of Aβ production.

    “Previous studies have measured Aβ clearance from the brain either using 35 S]methionine labeling [48], or by measuring the disappearance of Aβ following the pharmacological inhibition of Aβ production [49-51].”

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Authors
Cirrito, J. R., May, P. C., O'Dell, M. A., Taylor, J. W., Parsadanian, M., Cramer, J. W., Audia, J. E., Nissen, J. S., Bales, K. R., Paul, S. M., DeMattos, R. B., & Holtzman, D. M.
Affiliations
Eli Lilly (United States) (US)
Venue
The Journal of Neuroscience
Published
2003-10-01
Volume
23
Issue
26
Pages
8844-8853
ISSN
  • 0270-6474 (ISSN-L)
  • 1529-2401
OpenAlex
W4321429567
Cited by
394
References
10
Citations by year
2026: 8 · 2025: 8 · 2024: 7 · 2023: 28 · 2022: 19 · 2021: 10 · 2020: 23 · 2019: 13 · 2018: 15 · 2017: 23 · 2016: 15 · 2015: 28 · 2014: 23 · 2013: 22 · 2012: 28
FWCI
5.76
Type
journal article
Language
en
Open access
Locations
Journal of Neuroscience (publishedVersion)
Funders
  • MetLife Foundation
  • Eli Lilly and Company
  • National Institutes of Health (RR‐00036, AG13956, AG11355)
  • National Institute on Aging (AG11355, AG20222, R01AG020222, R01AG013956, R37AG013956, AG13956, P01AG011355)
  • National Center for Research Resources (M01-RR00036, M01RR000036)
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
Keywords
amyloid-beta, brain interstitial fluid, Alzheimer's disease, amyloid plaques, amyloid-beta metabolism, amyloid precursor protein transgenic mice, hippocampus, cerebrospinal fluid, microdialysis

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