[Construction of drug-loaded titanium implants via layer-by-layer electrostatic self-assembly]

Area of Science:

• Biomaterials Science
• Drug Delivery Systems
• Tissue Engineering

Background:

• Osteoporosis poses challenges for bone healing and implant osseointegration.
• Current drug delivery systems often lack sustained release capabilities for osteogenesis-promoting agents.
• Developing targeted implants with controlled drug release is crucial for improving treatment outcomes.

Purpose of the Study:

• To construct a long-term drug delivery implant for osteogenesis targeting using HU-308.
• To utilize the layer-by-layer (LBL) electrostatic self-assembly technique for implant fabrication.
• To evaluate the in vitro characteristics of delayed drug release from the developed implant.

Main Methods:

• Fabrication of heparin (Hep) and chitosan (Chi) multilayers on pure titanium via LBL technique.
• Loading of HU-308 onto titanium implants coated with Hep/Chi multilayers.
• Quantification of drug loading and release rates using UV-Vis spectrophotometry.
• Morphological characterization using scanning electron microscopy (SEM) and atomic force microscopy (AFM).

Main Results:

• Successful stepwise fabrication of Hep/Chi multilayers on titanium surfaces.
• Efficient loading of HU-308 onto the fabricated titanium implants.
• Drug loading increased with multilayer film thickness, with an exception in the T20 group.
• Thicker films resulted in decreased drug release rates, indicating sustained release over time.
• SEM and AFM confirmed typical LBL deposition patterns of Hep and Chi.

Conclusions:

• The LBL technique successfully produced a HU-308 drug delivery implant.
• The implant demonstrated sustained release of HU-308 for over 30 days.
• This implant technology offers a promising approach for enhancing implant-bone osseointegration, particularly in osteoporotic patients.