Regulation of macrophage polarization through surface topography design to facilitate implant-to-bone osteointegration

Abstract

Scale-dependent osteo-immune regulation induced by specific TiO ₂ nanostructure accelerates implant-to-bone integration.

Abstract

Proper immune responses are critical for successful biomaterial implantation. Here, four scales of honeycomb-like TiO ₂ structures were custom made on titanium (Ti) substrates to investigate cellular behaviors of RAW 264.7 macrophages and their immunomodulation on osteogenesis. We found that the reduced scale of honeycomb-like TiO ₂ structures could significantly activate the anti-inflammatory macrophage phenotype (M2), in which the 90-nanometer sample induced the highest expression level of CD206, interleukin-4, and interleukin-10 and released the highest amount of bone morphogenetic protein-2 among other scales. Afterward, the resulting immune microenvironment favorably triggered osteogenic differentiation of murine mesenchymal stem cells in vitro and subsequent implant-to-bone osteointegration in vivo. Furthermore, transcriptomic analysis revealed that the minimal scale of TiO ₂ honeycomb–like structure (90 nanometers) facilitated macrophage filopodia formation and up-regulated the Rho family of guanosine triphosphatases ( RhoA, Rac1, and CDC42), which reinforced the polarization of macrophages through the activation of the RhoA/Rho–associated protein kinase signaling pathway.