Bone-like ceramic scaffolds designed with bioinspired porosity induce a different stem cell response

Current research in biomaterials aims to create scaffolds that closely mimic natural bone structures. While traditional scaffolds often fail to replicate the complex architecture of native bone, recent efforts focus on multi-scale designs. Scientists have long studied how bone porosity influences cell behavior. However, few studies have combined both spongy and cortical bone features in one scaffold. This gap motivated the development of a new scaffold design. The goal is to better understand how structural features affect stem cell responses. Prior research has shown that scaffold architecture impacts cell adhesion and differentiation. Yet, the role of dual porosity in osteogenic processes remains unclear.

This study aimed to evaluate how bioinspired porosity affects stem cell behavior in ceramic scaffolds. The researchers designed scaffolds to mimic both spongy and cortical bone structures. They wanted to determine if these structures influence osteogenic differentiation. The motivation came from the need for more functional bone grafts. By combining different porosity types, the team hoped to enhance tissue regeneration. They focused on how scaffold architecture could modulate gene expression. The study also aimed to assess cell viability and adhesion under physiological conditions. The ultimate goal was to create a scaffold that supports rapid bone formation.

The researchers used hydroxyapatite and β-tricalcium phosphate to fabricate bioceramic scaffolds. They designed the scaffolds to mimic the spongy and cortical bone microstructures. Perfusion bioreactors were used to simulate interstitial fluid flow and shear stress. Mesenchymal stem cells were cultured on the scaffolds under these conditions. The team evaluated cell adhesion and viability using standard assays. They also analyzed gene expression related to osteogenic differentiation. The scaffolds were tested for their mechanical and structural properties. The results were compared between the two scaffold types to assess differences in cell response.

All scaffolds supported cell adhesion and viability, showing no toxic effects. Cortical bone scaffolds with aligned architecture induced higher gene expression. Specifically, late-stage osteogenic genes were overexpressed in these scaffolds. Spongy bone scaffolds showed lower levels of gene activation. The perfusion conditions mimicked physiological fluid flow accurately. The study found that scaffold architecture significantly influenced osteogenic differentiation. The aligned structure of cortical scaffolds enhanced osteogenic signaling. These findings suggest that scaffold design can modulate stem cell behavior effectively.

The study shows that bioinspired scaffold design can influence stem cell behavior. Cortical bone scaffolds with aligned architecture promote osteogenic gene expression. The spongy bone scaffolds supported cell viability but with less osteogenic activity. The dual-core scaffold design may support rapid bone formation at the tissue interface. The inner spongy structure could allow for subsequent bone maturation. The researchers propose that this design could improve bone graft outcomes. They suggest that scaffold architecture plays a key role in osteogenic processes. These findings support the development of more functional bone graft materials.