A Novel Rat Model for Human Meibomian Gland Dysfunction and Ocular Rosacea

Area of Science:

• Ophthalmology
• Dermatology
• Translational Medicine

Background:

• Ocular rosacea (OR) is a chronic, vision-threatening ocular surface disease linked to Meibomian gland dysfunction (MGD).
• OR and MGD are often underdiagnosed and lack effective cures due to poorly understood pathogenesis.
• Reliable animal models are crucial for advancing research in OR and MGD.

Purpose of the Study:

• To develop and validate a novel rat model of Meibomian gland dysfunction (MGD) and ocular rosacea (OR).
• To compare the induced MGD and OR in rats with human pathology for translational relevance.

Main Methods:

• Rat upper eyelids were exposed to controlled UVB radiation.
• Clinical signs, Meibomian gland morphology/function, transcriptomics, and lipidomics were analyzed.
• Comparisons were made with human ocular rosacea and Meibomian gland dysfunction samples.

Main Results:

• UVB exposure induced acute eyelid and Meibomian gland damage, including oxidative stress and inflammation.
• Persistent Meibomian gland duct hyperkeratinization and stem cell depletion led to MGD and corneal defects.
• The rat model exhibited fibrosis and gene/lipid expression patterns similar to human OR and MGD.

Conclusions:

• The developed rat model is a valuable tool for studying MGD pathophysiology in OR.
• This model aids in evaluating novel therapeutic strategies for ocular rosacea.
• Shared molecular pathways and lipid profiles offer potential biomarkers for diagnosis and treatment targets.