Evidence map›Paper›PMID 34499128›Full record

ArticleBrain : a journal of neurology2022

Emerging roles for dynamic aquaporin-4 subcellular relocalization in CNS water homeostasis.

Mootaz M Salman, Philip Kitchen, Andrea Halsey, Marie Xun Wang, Susanna Törnroth-Horsefield, Alex C Conner, Jerome Badaut, Jeffrey J Iliff, Roslyn M Bill

Open access · hybridAbstract read
In one paragraph

Article in Brain : a journal of neurology, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 178 papers, 2 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
178citing papers in PubMed, 2 pooled it
13.0field-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

178 citing papers in PubMed, 2 syntheses or guidelines pooled it, 248 citations in OpenAlex.

  1. Pooled it
  2. Pooled it
  3. Article
  4. Glial cells in neuropathic pain.Physiological reviews · 2026
    Review
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  11. 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
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118 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

9 authors at 6 institutions in 4 countries.

Mootaz M SalmanDepartment of Physiology, Anatomy and Genetics, University of Oxford, Oxford OX1 3PT, UK.
Philip KitchenSchool of Biosciences, College of Health and Life Sciences, Aston University, Aston Triangle, Birmingham B4 7ET, UK.
Andrea HalseyInstitute of Clinical Sciences, College of Medical and Dental Sciences, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK.
Marie Xun WangDepartment of Psychiatry and Behavioral Sciences, University of Washington School of Medicine, Seattle, WA, USA.
Susanna Törnroth-HorsefieldDepartment of Biochemistry and Structural Biology, Lund University, PO Box 124, 221 00 Lund, Sweden.
Alex C ConnerInstitute of Clinical Sciences, College of Medical and Dental Sciences, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK.
Jerome BadautCNRS-UMR 5536-Centre de Résonance Magnétique des systèmes Biologiques, Université de Bordeaux, 33076 Bordeaux, France.
Jeffrey J IliffDepartment of Psychiatry and Behavioral Sciences, University of Washington School of Medicine, Seattle, WA, USA.
Roslyn M BillSchool of Biosciences, College of Health and Life Sciences, Aston University, Aston Triangle, Birmingham B4 7ET, UK.ORCID 0000-0003-1331-0852
Aston University · GBUniversity of Birmingham · GBUniversity of Washington · USCentre National de la Recherche Scientifique · FRLund University · SEUniversity of Oxford · GB

Funding

Role of perivascular aquaporin-4 polarization in post-traumatic neurodegenerationR01NS089709 · NINDS · SEATTLE INST FOR BIOMEDICAL/CLINICAL RES · PI ILIFF, JEFFREY J · 2015 to 2019
$1.7M
Biotechnology and Biological Sciences Research Council BB/D012910/1British Heart Foundation PG/10/54/28460Medical Research Council MC_EX_MR/N50192X/1Medical Research Council MR/L023784/2Medical Research Council MR/M024962/1Medical Research Council MR/N029453/1Medical Research Council MR/P007058/1NINDS NIH HHS R01 NS089709Parkinson's UK G-0801Parkinson's UK G-1003Parkinson's UK H-1102Parkinson's UK H-1301Parkinson's UK J-0901Parkinson's UK K-1003
6 · The paper itself

Abstract

Aquaporin channels facilitate bidirectional water flow in all cells and tissues. AQP4 is highly expressed in astrocytes. In the CNS, it is enriched in astrocyte endfeet, at synapses, and at the glia limitans, where it mediates water exchange across the blood-spinal cord and blood-brain barriers (BSCB/BBB), and controls cell volume, extracellular space volume, and astrocyte migration. Perivascular enrichment of AQP4 at the BSCB/BBB suggests a role in glymphatic function. Recently, we have demonstrated that AQP4 localization is also dynamically regulated at the subcellular level, affecting membrane water permeability. Ageing, cerebrovascular disease, traumatic CNS injury, and sleep disruption are established and emerging risk factors in developing neurodegeneration, and in animal models of each, impairment of glymphatic function is associated with changes in perivascular AQP4 localization. CNS oedema is caused by passive water influx through AQP4 in response to osmotic imbalances. We have demonstrated that reducing dynamic relocalization of AQP4 to the BSCB/BBB reduces CNS oedema and accelerates functional recovery in rodent models. Given the difficulties in developing pore-blocking AQP4 inhibitors, targeting AQP4 subcellular localization opens up new treatment avenues for CNS oedema, neurovascular and neurodegenerative diseases, and provides a framework to address fundamental questions about water homeostasis in health and disease.

Indexed as

Aquaporin 4AstrocytesAnimalsBlood-Brain BarrierHomeostasisHumansWaterAquaporin 4Waterneurodegenerationregulationtraumatic brain and spinal cord injurywater channel

Identifiers

PMID34499128
PMCPMC9088512
OpenAlexW3198642554

What OpenQuestion holds

Textmetadata
LicenceCC BY
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.