TNF-α Regulated Bidirectional Interaction Between Bone Marrow Mesenchymal Stem Cells and Articular Chondrocytes

Area of Science:

• Cell Biology
• Stem Cell Biology
• Osteoarthritis Research

Background:

• Articular chondrocytes (ACs) maintain cartilage function; their degeneration leads to osteoarthritis.
• Bone marrow mesenchymal stem cells (BMSCs) protect ACs, making them a potential osteoarthritis treatment.

Purpose of the Study:

• To investigate the bidirectional effects of BMSC and AC secretions on each other in osteoarthritis.
• To understand the role of tumor necrosis factor-alpha (TNF-α) in mediating these interactions.

Main Methods:

• Isolated rabbit BMSCs and ACs were characterized.
• Cells were treated with conditioned media from TNF-α-stimulated BMSCs and ACs.
• Cell viability was assessed using CCK-8 assays.
• Gene and protein expression (Runx2, Alp, TNF, IL6, IL17A, IL10) and cytokine levels were measured via RT-qPCR, immunoblotting, and ELISA.

Main Results:

• Conditioned media affected cell viability after 12 hours, increasing BMSC viability and decreasing AC viability.
• TNF-α treatment dose-dependently elevated gene and protein expression of Runx2, Alp, and inflammatory/anti-inflammatory cytokines (TNF-α, IL-6, IL-17A, IL-10) in both cell types.
• Concentrations of these cytokines in the supernatant increased dose-dependently with TNF-α stimulation.

Conclusions:

• Results indicate a TNF-α-regulated bidirectional interaction between BMSCs and ACs.
• This interaction provides insights into osteoarthritis pathogenesis.
• Findings may aid in osteoarthritis prevention and treatment strategies.