PAS-Na-encapsulated liposome 3D-printed aerogel scaffolds for intelligent drug delivery system

Uncontrollable local drug release from drug-loaded scaffolds is a critical challenge in treating bone tuberculosis (BTB), which often leads to bacterial resistance and treatment failure. This study proposes an intelligent composite aerogel scaffold that integrates external stimulus response, sustained-release, and structural design. Using direct ink writing (DIW) and freeze-drying, liposome-encapsulated sodium para-aminosalicylate acid (PAS-Na@Lipo) and superparamagnetic iron oxide nanoparticles (SPIONs) modified with silk fibroin peptides (SF) were co-integrated into a hydroxyapatite scaffold, and thereby precisely constructed an aerogel scaffold (PAS-Na@Lipo/SPIONs/CNFs/n-HA/PVA) that combines extracellular matrix-like structure with controlled-release responsiveness. The incorporation of liposomes not only suppresses drug burst release significantly but also extends the effective drug release period to 336 hours. Furthermore, under remote, non-invasive triggering by an external alternating magnetic field (AMF), the local temperature of the scaffold can be maintained stable at 42 °C. This enables an accelerated, on-demand release of the drug, overcoming the limitations of uncontrolled delivery. By combining precise 3D printing, liposome-based sustained release, and dynamic magnetic regulation, the intelligent scaffold offers a promising new strategy for personalized treatment of bone tuberculosis.