Increased endogenous dopamine prevents myopia in mice.

Area of Science:

• Ophthalmology
• Neuroscience
• Genetics

Background:

• Dopamine (DA) is implicated in modulating refractive eye growth.
• Understanding DA's role in myopia is crucial for developing effective interventions.
• Form deprivation myopia (FDM) is a common model for studying myopia development.

Purpose of the Study:

• To investigate if increasing endogenous dopamine activity can prevent myopia susceptibility in mice.
• To evaluate the effects of pharmacological (L-DOPA) and genetic manipulation of dopamine pathways on myopia.

Main Methods:

• Systemic L-3,4-dihydroxyphenylalanine (L-DOPA) injections were administered to wild-type mice to increase dopamine synthesis.
• Transgenic mice with altered vesicular monoamine transporter 2 (VMAT2) expression were used to modulate dopamine release.
• Form deprivation myopia was induced in mice, and refractive error, corneal curvature, and ocular biometry were measured.

Main Results:

• L-DOPA treatment significantly attenuated the myopic shift induced by form deprivation in wild-type mice.
• Mice with reduced VMAT2 expression (VMAT2^LO) exhibited increased susceptibility to form deprivation myopia.
• Conversely, increased VMAT2 expression (VMAT2^HI) appeared protective against myopia development.

Conclusions:

• Increasing endogenous dopamine synthesis and release, via pharmacological or genetic means, effectively prevents form deprivation myopia in mice.
• These findings highlight dopamine's critical role in regulating eye growth and offer potential therapeutic targets for myopia control.