Osteoarthritic process modifies expression response to NiTi alloy presence.

Area of Science:

• Biomaterials Science
• Cell Biology
• Orthopedics

Background:

• Nickel-titanium (NiTi) alloy is a widely used biomaterial in medical applications due to its unique properties.
• Understanding NiTi's interaction with bone cells is crucial, especially in the context of osteoarthritic conditions.

Purpose of the Study:

• To investigate the effect of NiTi alloy on gene expression of interleukins (IL-1β, IL-6, IL-8) and matrix metalloproteinases (MMP-1, MMP-2) in human physiological and osteoarthritic osteoblasts.
• To explore the influence of bacterial lipopolysaccharide (LPS) on these cellular responses.

Main Methods:

• In vitro study using human physiological and osteoarthritic osteoblasts cultured with NiTi alloy.
• Analysis of gene expression changes for IL-1β, IL-6, IL-8, MMP-1, and MMP-2 using the 2^-ΔΔCt method.
• Evaluation of NiTi's effect with and without LPS treatment, considering cell proximity to the alloy.

Main Results:

• NiTi significantly increased IL-1β expression in osteoarthritic osteoblasts, with higher levels near the alloy surface.
• IL-8 expression was elevated in osteoarthritic osteoblasts treated with NiTi and in physiological osteoblasts with NiTi and LPS.
• MMP-1 expression was significantly higher in osteoarthritic osteoblasts, varying with surface modification and location; MMP-2 decreased with LPS treatment.

Conclusions:

• NiTi alloy and LPS treatment alter the gene expression of key inflammatory and matrix-degrading molecules in human osteoblasts.
• Osteoarthritic osteoblasts exhibit distinct responses to NiTi compared to physiological osteoblasts, highlighting material-biocompatibility differences.
• The findings provide insights into the behavior of bone tissue during metallic material implantation in osteoarthritic patients.