Evidence map›Paper›PMID 32462201›Full record

ArticleInvestigative ophthalmology & visual science2020

Collagen XII Is a Regulator of Corneal Stroma Structure and Function.

Mei Sun, Nabeel Zafrullah, Floriane Devaux, Chinda Hemmavanh, Sheila Adams, Noel M Ziebarth, Manuel Koch, David E Birk, Edgar M Espana

Open access · goldAbstract read
In one paragraph

Article in Investigative ophthalmology & visual science, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 28 papers.

0numbers the graph read from it
0cells of the map it votes in
28citing papers in PubMed
2.3field-weighted citation impact, top 9% 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

28 citing papers in PubMed, 33 citations in OpenAlex.

  1. Article
  2. Article
  3. Article
  4. Article
  5. Collagen Mechanics.Sub-cellular biochemistry · 2026
    Review
  6. Article
  7. Article
  8. Article
  9. Article
  10. Article
  11. Squishy matters - Corneal mechanobiology in health and disease.Progress in retinal and eye research · 2024
    Review
  12. Collagen type XII is undetectable in keratoconus Bowman's layer.The British journal of ophthalmology · 2024
    Article
  13. Article
  14. Article
  15. Article
  16. Article
  17. Review
  18. Collagen XII regulates stromal wound closure.Experimental eye research · 2023
    Article
  19. Review
  20. 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

9 authors at 3 institutions in 2 countries.

Mei Sun,.
Nabeel Zafrullah,.
Floriane Devaux.
Chinda Hemmavanh,.
Sheila Adams,.
Noel M Ziebarth.
Manuel Koch,.
David E Birk,.
Edgar M Espana,.
University of South Florida · USUniversity of Miami · USUniversity of Cologne · DE

Funding

Regulatory roles for collagen XII in establishment of corneal stromal structure and function and re-establishment after injuryR01EY029395 · NEI · UNIVERSITY OF SOUTH FLORIDA · PI ESPANA, EDGAR MAURICIO · 2018 to 2022
$1.8M
NEI NIH HHS R01 EY029395
6 · The paper itself

Abstract

Purpose: The aim of this study was to determine the roles of collagen XII in the regulation of stromal hierarchical organization, keratocyte organization, and corneal mechanics. Methods: The temporal and spatial expression of collagen XII at postnatal days 4, 10, 30, 90, and 150 were evaluated in wild-type (WT) mice. The role of collagen XII in hierarchical organization was analyzed by measuring fibril diameter and density, as well as stromal lamellar structure, within ultrastructural micrographs obtained from WT and collagen XII-deficient mice (Col12a1-/-). Keratocyte morphology and networks were assessed using actin staining with phalloidin and in vivo confocal microscopy. The effects of collagen XII on corneal biomechanics were evaluated with atomic force microscopy. Results: Collagen XII was localized homogeneously in the stroma from postnatal day 4 to day 150, and protein accumulation was shown to increase during this period using semiquantitative immunoblots. Higher fibril density (P < 0.001) and disruption of lamellar organization were found in the collagen XII null mice stroma when compared to WT mice. Keratocyte networks and organization were altered in the absence of collagen XII, as demonstrated using fluorescent microscopy after phalloidin staining and in vivo confocal microscopy. Corneal stiffness was increased in the absence of collagen XII. Young's modulus was 16.2 ± 5.6 kPa in WT and 32.8 ± 6.4 kPa in Col12a1-/- corneas. The difference between these two groups was significant (P < 0.001, t-test). Conclusions: Collagen XII plays a major role in establishing and maintaining stromal structure and function. In the absence of collagen XII, the corneal stroma showed significant abnormalities, including decreased interfibrillar space, disrupted lamellar organization, abnormal keratocyte organization, and increased corneal stiffness.

Indexed as

Age FactorsAnimalsAnimals, NewbornCollagen Type XIICorneal KeratocytesCorneal StromaMaleMiceCollagen Type XII

Identifiers

PMID32462201
PMCPMC7405808
OpenAlexW3031016186

What OpenQuestion holds

Textmetadata
LicenceCC BY-NC-ND
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.