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Inducement and Evaluation of a Murine Model of Experimental Myopia
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Melanopsin modulates refractive development and myopia.

Ranjay Chakraborty1, Erica G Landis2, Reece Mazade3

  • 1Department of Ophthalmology, Emory University School of Medicine, 1365B Clifton Rd NE, Atlanta, GA, 30322, United States; Center for Visual and Neurocognitive Rehabilitation, Atlanta VA Health Care System, 1670 Clairmont Rd, Decatur, GA, 30033, United States; College of Nursing and Health Sciences, Optometry and Vision Science, Flinders University, Bedford Park, SA, 5001, Adelaide, Australia; Caring Futures Institute, Flinders University, Bedford Park, SA, 5042, Adelaide, Australia.

Experimental Eye Research
|November 28, 2021
PubMed
Summary
This summary is machine-generated.

Melanopsin-expressing retinal ganglion cells (mRGCs) are crucial for normal vision development and myopia progression. Disrupting mRGCs increases susceptibility to myopia and alters dopamine signaling, suggesting mRGCs as a therapeutic target.

Keywords:
3,4-Dihydroxyphenylacetic acid (DOPAC)DopamineL-3,4-dihydroxyphenylalanine (L-DOPA)Melanopsin retinal ganglion cells (mRGCs)Opn4

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Genetics

Background:

  • Myopia is a common refractive error linked to ocular elongation.
  • Retinal neurotransmitter signaling, particularly dopamine, is implicated in myopia.
  • The visual pathways initiating myopia are not fully understood.

Purpose of the Study:

  • Investigate the role of melanopsin-expressing retinal ganglion cells (mRGCs) in refractive development.
  • Determine how mRGCs influence normal and myopic eye growth.
  • Explore the connection between mRGCs, dopamine signaling, and myopia.

Main Methods:

  • Utilized Opn4-/- and Opn4DTA/DTA mutant mice lacking functional mRGCs.
  • Measured refractive error, axial length, and corneal curvature.
  • Assessed retinal dopamine and DOPAC levels under normal and form-deprived conditions.
  • Administered L-DOPA to Opn4-/- mice to assess dopamine precursor effects.

Main Results:

  • Mice lacking mRGC function showed altered refractive development and increased susceptibility to form-deprivation myopia.
  • Disruption of mRGCs affected retinal dopamine and DOPAC levels, particularly after form deprivation.
  • L-DOPA treatment partially reversed form-deprivation myopia in Opn4-/- mice.

Conclusions:

  • Melanopsin signaling is essential for correct refractive development and protection against myopia.
  • mRGCs influence the eye's response to myopigenic stimuli via dopaminergic pathways.
  • mRGCs represent a potential therapeutic target for myopia progression.