La-Doped mesoporous calcium silicate/chitosan scaffolds for bone tissue engineering

Bone regeneration remains a clinical challenge, especially in patients with osteoporosis or metabolic disorders. Traditional scaffolds often lack sufficient osteoinductive properties. Prior research has shown that mesoporous calcium silicate (MCS) can support bone regeneration. However, the mechanisms behind rare earth element effects on bone tissue remain unclear. Lanthanum (La) has been reported to influence bone cell behavior, but its specific role in scaffolds is not well established. This gap motivated the development of La-doped scaffolds. No prior work had resolved how La integrates into hierarchical porous structures. This study explores how La-MCS/CTS scaffolds might enhance bone regeneration. The findings aim to clarify La's role in osteogenic differentiation and bone repair.

The study aimed to develop and evaluate lanthanum-doped mesoporous calcium silicate/chitosan (La-MCS/CTS) scaffolds for bone tissue engineering. The specific problem addressed is the need for scaffolds that can support bone regeneration in patients with metabolic diseases. The motivation stems from the potential of La to influence osteogenic processes. The scaffolds were designed using freeze-drying to create macroporous structures. The goal was to determine if La-MCS/CTS could enhance cell adhesion and bone formation. The study also sought to identify the signaling pathways involved in La's effects. The results could lead to improved scaffolds for clinical use. This work provides insights into La's role in bone regeneration.

The La-MCS/CTS scaffolds were fabricated using freeze-drying technology. Ice crystals served as templates to form macropores during scaffold construction. La-MCS nanoparticles were distributed on the macropore walls. The scaffolds were analyzed for their hierarchical porous structure and biocompatibility. Rat bone marrow-derived mesenchymal stem cells (rBMSCs) were cultured on the scaffolds to assess cell adhesion and proliferation. Osteogenic differentiation was evaluated using TGF signal pathway markers. A calvarial-defect rat model was used to test in vivo bone regeneration. The scaffolds were compared with pure MCS/CTS scaffolds to determine the effect of La doping.

The La-MCS/CTS scaffolds exhibited a three-dimensional macroporous structure. La-MCS nanoparticles were evenly distributed on the macropore walls. rBMSCs adhered, spread, and proliferated effectively on the scaffolds. The scaffolds supported the in-growth of new bone tissue. La3+ ions significantly induced osteogenic differentiation of rBMSCs. Activation of the TGF signal pathway was observed in La-doped scaffolds. In the calvarial-defect model, La-MCS/CTS scaffolds promoted more new bone regeneration than pure MCS/CTS scaffolds. The results suggest that La enhances osteogenesis and bone regeneration.

The La-MCS/CTS scaffolds demonstrated enhanced osteogenic potential compared to pure MCS/CTS scaffolds. La3+ ions activated the TGF signal pathway, which contributed to osteogenic differentiation. The hierarchical porous structure supported cell adhesion and proliferation. The scaffolds showed significant bone regeneration in a rat model. These findings suggest that La doping improves scaffold performance for bone repair. The study supports the application of La-MCS/CTS scaffolds in bone defect therapy. The results align with the authors' claim that La enhances osteogenesis. The findings do not generalize beyond the specific scaffold design tested.