Surface Engineering of Nanostructured Titanium Implants with Bioactive Ions

• Published in: Journal of dental research 2016-05, Vol.95 (5), p.558-565
• Main Authors: Kim, H.-S., Kim, Y.-J., Jang, J.-H., Park, J.-W.
• Format: Article
• Language: English
• Subjects: Adipogenesis; Adipogenesis - physiology; Adipose Tissue - cytology; Adsorption; Alkaline Phosphatase - analysis; Animals; Bioengineering; Bone healing; Bone implants; Bone marrow; Calcium; Calcium - chemistry; Cell Adhesion - physiology; Cell culture; Cell differentiation; Cell Differentiation - physiology; Cell Proliferation; Cells, Cultured; Chemical modification; Chemistry; Dental Implants; Dental Materials - chemistry; Dental prosthetics; Dental restorative materials; Dentistry; Fibronectin; Fibronectins - chemistry; Gene expression; Humans; Ions; Materials Testing; Mesenchymal Stromal Cells - physiology; Mesenchyme; Mice; Microscopy; Morphology; Multipotent Stem Cells - physiology; Nanostructures - chemistry; Osseointegration; Osteogenesis; Osteogenesis - physiology; Phosphatase; Polymerase chain reaction; Proteins; rhoA GTP-Binding Protein - analysis; RhoA protein; Statistical analysis; Stem cell transplantation; Stem cells; Strontium; Strontium - chemistry; Surface Properties; Talin; Talin - analysis; Titanium; Titanium - chemistry; Transplants & implants; Vinculin; Vinculin - analysis; Wettability
• ISSN: 0022-0345; 1544-0591
• DOI: 10.1177/0022034516638026

Surface nanofeatures and bioactive ion chemical modification are centrally important in current titanium (Ti) oral implants for enhancing osseointegration. However, it is unclear whether the addition of bioactive ions definitively enhances the osteogenic capacity of a nanostructured Ti implant. We systematically investigated the osteogenesis process of human multipotent adipose stem cells triggered by bioactive ions in the nanostructured Ti implant surface. Here, we report that bioactive ion surface modification (calcium [Ca] or strontium [Sr]) and resultant ion release significantly increase osteogenic activity of the nanofeatured Ti surface. We for the first time demonstrate that ion modification actively induces focal adhesion development and expression of critical adhesion–related genes (vinculin, talin, and RHOA) of human multipotent adipose stem cells, resulting in enhanced osteogenic differentiation on the nanofeatured Ti surface. It is also suggested that fibronectin adsorption may have only a weak effect on early cellular events of mesenchymal stem cells (MSCs) at least in the case of the nanostructured Ti implant surface incorporating Sr. Moreover, results indicate that Sr overrides the effect of Ca and other important surface factors (i.e., surface area and wettability) in the osteogenesis function of various MSCs (derived from human adipose, bone marrow, and murine bone marrow). In addition, surface engineering of nanostructured Ti implants using Sr ions is expected to exert additional beneficial effects on implant bone healing through the proper balancing of the allocation of MSCs between adipogenesis and osteogenesis. This work provides insight into the future surface design of Ti dental implants using surface bioactive ion chemistry and nanotopography.