Surface nanofeature effects on titanium-adherent human mesenchymal stem cells

Area of Science:

• Biomaterials Science
• Cell Biology
• Surface Engineering

Background:

• Commercially pure titanium (CP Ti) is widely used in dental and orthopedic implants.
• Surface modifications aim to improve implant osseointegration and biological response.
• Titanium oxide (TiO2) grit blasting creates a micro-rough surface, but nanofeatures may offer further benefits.

Purpose of the Study:

• To investigate the effect of surface nanotopography on adherent osteoblastic differentiation.
• To understand how hydrofluoric acid (HF) treatment of TiO2 grit-blasted titanium influences cell behavior.
• To evaluate the osteoinductive potential of nanofeature-enhanced titanium surfaces.

Main Methods:

• Human mesenchymal stem cells (hMSCs) cultured on TiO2 grit-blasted and HF-treated/TiO2 grit-blasted titanium.
• Surface characterization using scanning electron microscopy (SEM), optical interferometry, and X-ray photoelectron spectrometry (XPS).
• Osteoblastic differentiation assessed via real-time polymerase chain reaction (RT-PCR) for over 80 mineralized tissue-associated genes.

Main Results:

• HF-treated surfaces exhibited distinct nanofeatures (100 nm diameter) while retaining micro-roughness.
• Adherent hMSC osteoblastic differentiation occurred on both surfaces.
• HF-treated surfaces demonstrated accelerated and enhanced osteoblastic differentiation, evidenced by earlier, higher, and sustained expression of osteogenic markers.

Conclusions:

• Superimposing nanofeatures onto moderately rough titanium surfaces significantly enhances osteoinduction and osteogenesis.
• Nanotopography plays a crucial role in directing the behavior of adherent mesenchymal stem cells.
• Further investigation into the mechanisms by which nanotopography influences cell behavior is warranted.