Biocompatibility of polymeric delivery systems for macromolecules

Area of Science:

• Biomaterials Science
• Ophthalmology
• Polymer Chemistry

Background:

• Polymeric delivery systems are crucial for sustained release of macromolecules.
• Evaluating the in vivo tissue compatibility of these polymers is essential for safe and effective applications.
• The rabbit cornea offers a unique and advantageous site for in vivo implantation studies.

Purpose of the Study:

• To assess the in vivo tissue compatibility of polymeric materials intended for sustained macromolecular release.
• To compare the host responses to different polymers implanted in the rabbit cornea.
• To identify biocompatible polymers suitable for advanced drug delivery systems.

Main Methods:

• In vivo implantation of various polymeric materials into the rabbit cornea.
• Examination of host responses using stereomicroscopy and histological analysis.
• Evaluation of tissue compatibility based on inflammatory markers and cellular reactions.

Main Results:

• Poly(hydroxyethyl methacrylate) and alcohol-washed ethylene-vinyl acetate copolymer exhibited noninflammatory responses.
• Polyacrylamide and poly(vinyl pyrrolidone) elicited significant inflammatory reactions in the corneal tissue.
• The rabbit cornea proved to be a suitable model for evaluating polymer biocompatibility.

Conclusions:

• Poly(hydroxyethyl methacrylate) and ethylene-vinyl acetate copolymer are promising candidates for developing safe sustained-release drug delivery systems.
• Careful selection of polymers is critical to avoid adverse inflammatory reactions in ocular implants.
• This study provides valuable insights into the biocompatibility of polymers for ophthalmic applications.