How might atropine slow experimental myopia?
In form-deprived mice, atropine drops cut axial elongation and ECM remodeling, restored choroid/sclera thickness and CVI, lowered HIF-1α, and protected hypoxic scleral fibroblasts via P53/β-catenin pathways.
Source
The role of atropine in myopia control: insights into choroidal and scleral mechanisms
Study at a glance
- Design
- Animal / in-vitro — Form-deprivation myopia in C57BL/6 mice ± 10 mg/mL atropine drops TID; plus hypoxic MSF culture with Na2S2O4 then atropine
- N
- N=16 · N=4 mice per group × 4 groups (mock, atropine, FDM, FDM+atropine); in-vitro MSFs additional
- Population
- Male C57BL/6 mice (3 weeks) with monocular form deprivation and primary mouse scleral fibroblasts
- Outcome
- Axial length, ECM/collagen, choroid/sclera thickness, CVI, HIF-1α, and fibroblast signaling
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How might atropine slow experimental myopia?
These passages occur verbatim in the stored paper text. They support the points listed below; they do not verify every statement in the explanation.
Four groups with N=4 mice each received saline or 10 mg/mL atropine.
4) FDM + Atropine group: covered eye treated with 10 mg/mL atropine ( N = 4 per group).
Sample size targeted 80% power for a large effect (d=2.1) at α=0.05.
The sample size of four mice per group was determined based on a power analysis (GPower 3.1.9.7) to detect a large effect size (d = 2.1) with 80% power at α = 0.05, consistent with prior studies using the FDM model
What they did
Covered one eye of 3-week C57BL/6 males (N=4/group) and gave saline or 10 mg/mL atropine TID for 21 days; measured ocular morphology, CVF, CVI, and ECM/HIF-1α. In vitro, MSFs were made hypoxic with Na2S2O4 then treated with atropine.
What they found
Atropine reduced FDM axial elongation and scleral collagen-volume-fraction remodeling, restored choroidal and scleral thickness, increased CVI (central/intermediate), reduced HIF-1α, and in vitro preserved fibroblast cytoskeleton while modulating P53 and β-catenin.
The limits
What it doesn't show
N=4/group is small; 10 mg/mL in mice is not the 0.01% pediatric drop used clinically, and human choroidal-flow causality is not proven here.
Key terms
- Form deprivation myopia (FDM)
- Monocular diffuser/cover that drives axial elongation in young mice.
- Atropine
- Muscarinic antagonist given here as 10 mg/mL eye drops three times daily.
- CVI
- Choroidal vascular index, a histologic proxy of choroidal microcirculation.
- HIF-1α
- Hypoxia-inducible factor-1α, upregulated in scleral hypoxia and reduced by atropine.
- ECM remodeling
- Scleral extracellular-matrix change (collagen volume fraction) that accompanies axial myopia.
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Mice per group numbered:
Common questions
How many mice per group?
N = 4 per group (four treatment arms).
What atropine regimen?
10 mg/mL drops three times daily.
What happened to axial length?
Atropine significantly reduced FDM axial elongation.
In-vitro hypoxia model?
Na2S2O4 on mouse scleral fibroblasts, then atropine.
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