Biological responses to M13 bacteriophage modified titanium surfaces in vitro

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Immunology
• Osteoimmunomodulation

Background:

• Phage-based materials show promise in tissue engineering, but their inflammatory responses are not well understood.
• Understanding the interplay between immune cells and bone cells (osteoimmunomodulation) is crucial for ideal implant design.
• Titanium (Ti) surfaces modified with M13 bacteriophage (phage) films were investigated for their biological effects.

Purpose of the Study:

• To explore the in vitro biological responses of M13 bacteriophage-modified titanium surfaces.
• To investigate the interaction with macrophages and osteoblasts, and assess mineralization behavior.
• To evaluate the osteoimmunomodulation properties of phage films on titanium surfaces.

Main Methods:

• Comparison of pretreated Ti surfaces with noncrosslinked (APP) and crosslinked (APPG) phage films.
• Assessment of macrophage adhesion, activity, and apoptosis.
• Measurement of inflammatory cytokines (TNF-α, IL-6, IL-10) at different time points (24h, 7-10 days).
• Evaluation of osteoblast adhesion, differentiation, and hydroapatite (HA)-forming ability.

Main Results:

• Phage films induced macrophage apoptosis, limiting adhesion and activity.
• Initial high inflammatory response (TNF-α) at 24h decreased over time, with reduced TNF-α/IL-6 and increased IL-10.
• Phage films enhanced osteoblast adhesion, differentiation, and HA mineralization.
• Noncrosslinked phage film (APP) demonstrated superior immunomodulatory, osteogenic, and mineralization capabilities.

Conclusions:

• Phage films exhibit tunable immunomodulatory effects, reducing inflammation in later stages.
• Phage-modified titanium surfaces promote osteogenesis and biomineralization.
• Noncrosslinked phage films are promising for tissue engineering applications due to their balanced biological responses.