[Pharmacologic vitreolysis in diabetic rats]

Area of Science:

• Ophthalmology
• Retinal Research
• Pharmacology

Background:

• Diabetic retinopathy is a leading cause of vision loss.
• Posterior vitreous detachment (PVD) is a key event in the progression of diabetic retinopathy.
• Developing methods to induce PVD is crucial for studying diabetic retinopathy models.

Purpose of the Study:

• To assess the efficacy and safety of intravitreal plasmin and hyaluronidase for inducing PVD in diabetic rats.
• To compare the effects of combined versus monotherapy with plasmin and hyaluronidase.

Main Methods:

• Diabetes was induced in Sprague-Dawley rats using streptozotocin.
• Rats received intravitreal injections of plasmin, hyaluronidase, a combination, or balanced salt solution.
• Posterior vitreous detachment was evaluated using scanning electron microscopy.
• Ocular toxicity was assessed via electroretinography and histology.

Main Results:

• The combination of plasmin and hyaluronidase induced complete PVD in 100% of treated eyes.
• Plasmin alone induced complete PVD in 40% of eyes; hyaluronidase alone did not induce PVD.
• No significant toxicity was observed in any treatment group based on ERG and histological findings.

Conclusions:

• Combined intravitreal injection of plasmin and hyaluronidase is an effective and safe method for inducing PVD in diabetic rat models.
• Monotherapy with plasmin or hyaluronidase is insufficient for complete PVD induction.
• This combination therapy offers a promising approach for preclinical studies of diabetic retinopathy.