Evidence map›Paper›PMID 26689753›Full record

ReviewExperimental eye research2016

Transport across Schlemm's canal endothelium and the blood-aqueous barrier.

Sietse T Braakman, James E Moore, C Ross Ethier, Darryl R Overby

Open access · greenAbstract readReview
In one paragraph

Review in Experimental eye research, 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 17 papers.

0numbers the graph read from it
0cells of the map it votes in
17citing papers in PubMed
0.9field-weighted citation impact, top 24% 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

17 citing papers in PubMed, 29 citations in OpenAlex.

  1. Article
  2. Drug Delivery Technologies for the Treatment of Age-Related Macular Degeneration.Advanced science (Weinheim, Baden-Wurttemberg, Germany) · 2025
    Review
  3. Article
  4. Article
  5. Article
  6. Article
  7. Article
  8. Review
  9. Article
  10. Article
  11. Immune responses to injury and their links to eye disease.Translational research : the journal of laboratory and clinical medicine · 2021
    Review
  12. Review
  13. Review
  14. Article
  15. Progress in the basic and clinical research on the Schlemm's canal.International journal of ophthalmology · 2020
    Review
  16. Article
  17. Article
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

4 authors at 2 institutions in 2 countries.

Sietse T BraakmanDepartment of Bioengineering, Imperial College London, London, United Kingdom.
James E MooreDepartment of Bioengineering, Imperial College London, London, United Kingdom.
C Ross EthierDepartment of Bioengineering, Imperial College London, London, United Kingdom; Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, USA.
Darryl R OverbyDepartment of Bioengineering, Imperial College London, London, United Kingdom. Electronic address: d.overby@imperial.ac.uk.
Imperial College London · GBGeorgia Institute of Technology · US

Funding

The Mechanical Basis of Primary Open Angle GlaucomaR01EY019696 · NEI · NORTHWESTERN UNIVERSITY · PI FREDBERG, JEFFREY J, JOHNSON, MARK · 2009 to 2019
$7.6M
eNOS-Dependent Mechanoregulation of Intraocular PressureR01EY022359 · NEI · DUKE UNIVERSITY · PI STAMER, W DANIEL · 2012 to 2025
$5.6M
NEI NIH HHS R01 EY019696NEI NIH HHS R01 EY022359
6 · The paper itself

Abstract

The majority of trabecular outflow likely crosses Schlemm's canal (SC) endothelium through micron-sized pores, and SC endothelium provides the only continuous cell layer between the anterior chamber and episcleral venous blood. SC endothelium must therefore be sufficiently porous to facilitate outflow, while also being sufficiently restrictive to preserve the blood-aqueous barrier and prevent blood and serum proteins from entering the eye. To understand how SC endothelium satisfies these apparently incompatible functions, we examined how the diameter and density of SC pores affects retrograde diffusion of serum proteins across SC endothelium, i.e. from SC lumen into the juxtacanalicular tissue (JCT). Opposing retrograde diffusion is anterograde bulk flow velocity of aqueous humor passing through pores, estimated to be approximately 5 mm/s. As a result of this relatively large through-pore velocity, a mass transport model predicts that upstream (JCT) concentrations of larger solutes such as albumin are less than 1% of the concentration in SC lumen. However, smaller solutes such as glucose are predicted to have nearly the same concentration in the JCT and SC. In the hypothetical case that, rather than micron-sized pores, SC formed 65 nm fenestrae, as commonly observed in other filtration-active endothelia, the predicted concentration of albumin in the JCT would increase to approximately 50% of that in SC. These results suggest that the size and density of SC pores may have developed to allow SC endothelium to maintain the blood-aqueous barrier while simultaneously facilitating aqueous humor outflow.

Indexed as

AnimalsAqueous HumorBiological TransportBlood-Aqueous BarrierEndotheliumGlaucomaHumansMicroscopy, Electron, ScanningScleraTrabecular MeshworkBiological transport phenomenaBlood-aqueous barrierDiffusionGlaucomaSchlemm's canal endothelium

Identifiers

PMID26689753
PMCPMC4893895
OpenAlexW2219952376

What OpenQuestion holds

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LicenceTDM
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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.