Evidence map›Paper›PMID 34302355›Full record

ArticleBritish journal of pharmacology2021

Insights into the mechanism by which atropine inhibits myopia: evidence against cholinergic hyperactivity and modulation of dopamine release.

Kate Thomson, Tamsin Kelly, Cindy Karouta, Ian Morgan, Regan Ashby

Open access · greenAbstract read
In one paragraph

Article in British journal of pharmacology, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 25 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
25citing papers in PubMed, 1 pooled it
6.0field-weighted citation impact, top 3% 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

25 citing papers in PubMed, 1 synthesis or guideline pooled it, 49 citations in OpenAlex.

  1. Pooled it
  2. Article
  3. Light intensity and light/dark cycles regulate refractive development and myopia in mice through circadian rhythm-related genes.Graefe's archive for clinical and experimental ophthalmology = Albrecht von Graefes Archiv fur klinische und experimentelle Ophthalmologie · 2026
    Article
  4. Review
  5. Article
  6. IMI-Interventions for Controlling Myopia Onset and Progression 2025.Investigative ophthalmology & visual science · 2025
    Review
  7. Article
  8. How Have Animal Models Increased our Understanding of Human Myopia?Investigative ophthalmology & visual science · 2025
    Review
  9. Topical review: Potential mechanisms of atropine for myopia control.Optometry and vision science : official publication of the American Academy of Optometry · 2025
    Review
  10. Review
  11. Administration of Nicotine Can Inhibit Myopic Growth in Animal Models.Investigative ophthalmology & visual science · 2024
    Article
  12. Article
  13. Article
  14. The influence of the environment and lifestyle on myopia.Journal of physiological anthropology · 2024
    Review
  15. Article
  16. Retardation of myopia by atropine regimes.International journal of ophthalmology · 2024
    Review
  17. Article
  18. Article
  19. The Role of Retinal Dysfunction in Myopia Development.Cellular and molecular neurobiology · 2023
    Review
  20. Myopia control in Mendelian forms of myopia.Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians (Optometrists) · 2023
    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

5 authors at 2 institutions in 1 country.

Kate ThomsonCentre for Research in Therapeutic Solutions, Faculty of Science and Technology, University of Canberra, Canberra, Australian Capital Territory, Australia.ORCID 0000-0002-2272-2800
Tamsin KellyNational Centre for Forensic Studies, Faculty of Science and Technology, University of Canberra, Canberra, Australian Capital Territory, Australia.ORCID 0000-0002-8946-9686
Cindy KaroutaCentre for Research in Therapeutic Solutions, Faculty of Science and Technology, University of Canberra, Canberra, Australian Capital Territory, Australia.ORCID 0000-0003-1157-2840
Ian MorganResearch School of Biology, Australian National University, Canberra, Australian Capital Territory, Australia.ORCID 0000-0002-4548-3574
Regan AshbyCentre for Research in Therapeutic Solutions, Faculty of Science and Technology, University of Canberra, Canberra, Australian Capital Territory, Australia.ORCID 0000-0002-8027-6490
University of Canberra · AUAustralian National University · AU

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

background and purposeThe ability of the muscarinic cholinergic antagonist atropine to inhibit myopia development in humans and animal models would suggest that cholinergic hyperactivity may underlie myopic growth. To test this, we investigated whether cholinergic agonists accelerate ocular growth rates in chickens. Furthermore, we investigated whether atropine alters ocular growth by downstream modulation of dopamine levels, a mechanism postulated to underlie its antimyopic effects. EXPERIMENTAL APPROACH: Muscarinic (muscarine and pilocarpine), nicotinic (nicotine) and non-specific (oxotremorine and carbachol) cholinergic agonists were administered to chicks developing form-deprivation myopia (FDM) or chicks that were otherwise untreated. Vitreal levels of dopamine and its primary metabolite 3,4-dihydroxyphenylacetic acid (DOPAC) were examined using mass spectrometry MS in form-deprived chicks treated with atropine (360, 15 or 0.15 nmol). Further, we investigated whether dopamine antagonists block atropine's antimyopic effects. KEY

resultsUnexpectedly, administration of each cholinergic agonist inhibited FDM but did not affect normal ocular development. Atropine only affected dopamine and DOPAC levels at its highest dose. Dopamine antagonists did not alter the antimyopia effects of atropine. CONCLUSION AND IMPLICATIONS: Muscarinic, nicotinic and non-specific cholinergic agonists inhibited FDM development. This indicates that cholinergic hyperactivity does not underlie myopic growth and questions whether atropine inhibits myopia via cholinergic antagonism. This study also demonstrates that changes in retinal dopamine release are not required for atropine's antimyopic effects. Finally, nicotinic agonists may represent a novel and more targeted approach for the cholinergic control of myopia as they are unlikely to cause the anterior segment side effects associated with muscarinic treatment.

Indexed as

AtropineMyopiaAnimalsChickensDopamineHumansMuscarinic AntagonistsRetinaAtropineDopamineMuscarinic AntagonistsAChatropinedopaminemyopiarefractive development

Identifiers

PMID34302355
PMCPMC9293064
OpenAlexW3183217293

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.