Evidence map›Paper›PMID 33949874›Full record

ReviewPhysiological reviews2022

Fluid transport in the brain.

Martin Kaag Rasmussen, Humberto Mestre, Maiken Nedergaard

Open access · greenAbstract readReview
In one paragraph

Review in Physiological reviews, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 347 papers, 2 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
347citing papers in PubMed, 2 pooled it
32.6field-weighted citation impact, top 1% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

347 citing papers in PubMed, 2 syntheses or guidelines pooled it, 528 citations in OpenAlex.

  1. Pooled it
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  11. Cross-disease protein aggregate interactions in neurodegeneration: from molecular mechanisms to therapeutic strategies.Neurological sciences : official journal of the Italian Neurological Society and of the Italian Society of Clinical Neurophysiology · 2026
    Review
  12. Article
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  15. Article
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  19. Glymphatic dysfunction in cerebellar neurodegeneration: mechanistic insights and emerging clinical implications.Neurological sciences : official journal of the Italian Neurological Society and of the Italian Society of Clinical Neurophysiology · 2026
    Review
  20. Article

287 more citing papers are in PubMed but not listed here.

4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

3 authors at 2 institutions in 2 countries.

Martin Kaag RasmussenCenter for Translational Neuromedicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark.
Humberto MestreCenter for Translational Neuromedicine, University of Rochester Medical Center, Rochester, New York.
Maiken NedergaardCenter for Translational Neuromedicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark.ORCID 0000-0001-6502-6031
University of Copenhagen · DKUniversity of Rochester Medical Center · US

Funding

Para-Vascular Basis of Small Vessel DiseaseR01NS100366 · NINDS · UNIVERSITY OF ROCHESTER · PI NEDERGAARD, MAIKEN · 2016 to 2020
$3.8M
Characterizing the glymphatic peri-vascular connectome and its disruption in ADRF1AG053991 · NIA · YALE UNIVERSITY · PI BENVENISTE, HELENE D, NEDERGAARD, MAIKEN · 2016 to 2016
$3.4M
Age and AD related bottlenecks in glymphatic-lymphatic waste transportRF1AG057575 · NIA · UNIVERSITY OF ROCHESTER · PI NEDERGAARD, MAIKEN · 2017 to 2017
$3.2M
The glymphatic system at the crossroad of integrative health approaches inchronic painR01AT011439 · NCCIH · UNIVERSITY OF ROCHESTER · PI NEDERGAARD, MAIKEN · 2021 to 2025
$3.1M
Capillary hyperemia in white matter: Novel mechanistic insight and effect of hypertension and agingRF1NS110049 · NINDS · UNIVERSITY OF ROCHESTER · PI NEDERGAARD, MAIKEN, WAN, JIANDI · 2018 to 2018
$2.9M
NCCIH NIH HHS R01 AT011439NIA NIH HHS RF1 AG053991NIA NIH HHS RF1 AG057575NINDS NIH HHS R01 NS100366NINDS NIH HHS RF1 NS110049
6 · The paper itself

Abstract

The brain harbors a unique ability to, figuratively speaking, shift its gears. During wakefulness, the brain is geared fully toward processing information and behaving, while homeostatic functions predominate during sleep. The blood-brain barrier establishes a stable environment that is optimal for neuronal function, yet the barrier imposes a physiological problem; transcapillary filtration that forms extracellular fluid in other organs is reduced to a minimum in brain. Consequently, the brain depends on a special fluid [the cerebrospinal fluid (CSF)] that is flushed into brain along the unique perivascular spaces created by astrocytic vascular endfeet. We describe this pathway, coined the term glymphatic system, based on its dependency on astrocytic vascular endfeet and their adluminal expression of aquaporin-4 water channels facing toward CSF-filled perivascular spaces. Glymphatic clearance of potentially harmful metabolic or protein waste products, such as amyloid-β, is primarily active during sleep, when its physiological drivers, the cardiac cycle, respiration, and slow vasomotion, together efficiently propel CSF inflow along periarterial spaces. The brain's extracellular space contains an abundance of proteoglycans and hyaluronan, which provide a low-resistance hydraulic conduit that rapidly can expand and shrink during the sleep-wake cycle. We describe this unique fluid system of the brain, which meets the brain's requisites to maintain homeostasis similar to peripheral organs, considering the blood-brain-barrier and the paths for formation and egress of the CSF.

Indexed as

Glymphatic SystemAmyloid beta-PeptidesBiological TransportBlood-Brain BarrierBrainCerebrospinal FluidHumansAmyloid beta-Peptidesbrain clearancebrain extracellular matrixbrain fluid transportcerebrospinal fluidglymphatic system

Identifiers

PMID33949874
PMCPMC8897154
OpenAlexW3159077390

What OpenQuestion holds

Textmetadata
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.