A Novel Model of Meibomian Gland Dysfunction Induced with Complete Freund's Adjuvant in Rabbits

Area of Science:

• Ophthalmology
• Veterinary Medicine
• Pathophysiology

Background:

• Meibomian gland dysfunction (MGD) with meibomitis is a common ocular surface disease.
• Understanding the pathophysiology of MGD with meibomitis requires suitable animal models.
• Current models may not fully replicate human disease characteristics.

Purpose of the Study:

• To develop and characterize a novel rabbit model of MGD with meibomitis.
• To evaluate the efficacy of steroid eye drops in this new MGD model.
• To provide a tool for assessing new drug candidates for MGD.

Main Methods:

• Induction of MGD in rabbits via subcutaneous injection of complete Freund's adjuvant (CFA) into the upper eyelid margin.
• Chronological observation of eyelid margins using slit lamp examination.
• Histopathological assessment of meibomian gland changes and inflammatory responses.
• Evaluation of topical tobramycin/dexamethasone (Tob/Dex) eye drops.

Main Results:

• CFA injection successfully induced MGD symptoms including plugged orifices, telangiectasia, and abnormal meibum.
• Histopathology confirmed inflammation, hyperkeratinization, and ductal changes consistent with MGD.
• Tob/Dex eye drops significantly reduced orifice plugging and telangiectasia.
• The rabbit model demonstrated key features of human MGD with meibomitis.

Conclusions:

• A novel and effective rabbit model for MGD with meibomitis has been established using CFA.
• This model accurately mimics clinical and pathological features of human MGD.
• The model is suitable for evaluating the therapeutic potential of drugs like Tob/Dex for MGD treatment.