Electro-responsive macroporous polypyrrole scaffolds for triggered dexamethasone delivery.

Area of Science:

• Biomaterials Science
• Ophthalmology
• Drug Delivery Systems

Background:

• Non-infectious posterior uveitis is commonly treated with corticosteroids like dexamethasone.
• Intravitreal injections, while effective, present challenges including poor adherence and complications.
• Current ocular implants lack personalized dosing capabilities.

Purpose of the Study:

• To fabricate electrically responsive macroporous polypyrrole (PPy) inverse opal (IO) thin films.
• To develop a triggered dexamethasone release system for ophthalmic applications.
• To investigate the potential for on-demand drug delivery and dose individualization.

Main Methods:

• Fabrication of PPy IO thin films using colloidal crystal templates.
• Characterization of PPy IO films using SEM, UV-Vis reflectance, and cyclic voltammetry.
• Incorporation of dexamethasone phosphate (DexP) for drug release studies.

Main Results:

• Electrically controlled redox state of PPy IO films influenced porosity and optical properties.
• PPy IO films demonstrated triggered dexamethasone release upon electrical stimulation.
• Higher DexP release was observed from PPy IO films compared to non-porous PPy films.

Conclusions:

• Electrically responsive PPy IO structures are suitable for on-demand ophthalmic drug delivery.
• This technology offers potential for fine-tuning corticosteroid dosage for enhanced safety and efficacy.
• The developed system addresses limitations of current uveitis treatments by enabling personalized drug delivery.