Calcium binding-mediated sustained release of minocycline from hydrophilic multilayer coatings targeting infection...

Area of Science:

• Biomaterials Science
• Drug Delivery Systems
• Nanotechnology

Background:

• Implanted medical devices face infection and inflammation, compromising function and longevity.
• Systemic drug delivery often fails to achieve effective local concentrations and causes adverse effects.
• Current drug-eluting coatings can be hydrophobic and thick, hindering tissue integration.

Purpose of the Study:

• To develop and characterize a novel calcium-mediated drug delivery mechanism for implant coatings.
• To enable controlled, sustained release of therapeutics from thin, hydrophilic layers.
• To create a 'smart' drug delivery system responsive to local tissue conditions.

Main Methods:

• Development of nanoscale thin hydrophilic polyelectrolyte multilayers.
• Incorporation of calcium (Ca2+) to mediate drug release.
• Characterization of minocycline release kinetics under varying conditions.
• Investigation of pH-responsive drug release.

Main Results:

• Achieved sustained release of minocycline for over 35 days at physiologically relevant concentrations.
• Demonstrated pH-responsive release, with increased release at acidic pH.
• Showcased control over release kinetics by adjusting Ca2+ concentration and loading.
• Confirmed the potential for releasing drugs with high Ca2+ binding affinity.

Conclusions:

• The calcium-mediated system offers a promising approach for localized, sustained drug delivery from implant coatings.
• This platform enhances biocompatibility by utilizing thin, hydrophilic layers.
• The pH-responsive nature allows for targeted delivery in response to infection or inflammation.
• The versatility of this platform supports broad biomedical applications.