A Suturable and Drug-Free Polyzwitterionic Hydrogel for Alleviating Scar Formation After Glaucoma Filtration Surgery

Area of Science:

• Biomaterials Science
• Ophthalmology
• Regenerative Medicine

Background:

• Glaucoma filtration surgery (GFS) is a primary treatment for irreversible blindness, but scar formation can compromise outcomes.
• Postoperative inflammation and immune responses lead to excessive scarring, potentially causing uncontrolled intraocular pressure (IOP).

Purpose of the Study:

• To develop a suturable polyzwitterionic hydrogel, P(HEMA-CBOH), for preventing scar formation after GFS.
• To evaluate the efficacy of P(HEMA-CBOH) in maintaining filtration bleb survival and reducing IOP in an animal model.

Main Methods:

• A polyzwitterionic hydrogel was synthesized by combining 2-((2-hydroxy-3-(methacryloyloxy) propyl) dimethyl ammonio) acetate (CBOH) and 2-hydroxyethyl methacrylate (HEMA).
• The P(HEMA-CBOH) hydrogel was implanted in an animal model following GFS.
• Postoperative outcomes including filtration bleb survival, IOP, collagen deposition, and α-SMA expression were assessed.

Main Results:

• The P(HEMA-CBOH) hydrogel demonstrated excellent antifouling properties and mechanical characteristics similar to native ocular tissue.
• In the animal model, P(HEMA-CBOH) maintained filtration bleb survival and lowered IOP for up to 4 weeks postoperatively.
• The hydrogel significantly reduced collagen deposition and α-SMA expression, indicating inhibition of scar formation.

Conclusions:

• The suturable, drug-free P(HEMA-CBOH) hydrogel effectively inhibits scar formation following GFS.
• P(HEMA-CBOH) hydrogel shows significant potential for improving GFS outcomes and reducing complications.
• The antifouling properties of P(HEMA-CBOH) contribute to its efficacy in clinical applications for glaucoma treatment.