3D Bioprinted Human Synovium-Cartilage Models Mimic Rheumatoid Arthritis Microenvironment and Recapitulate In Vivo...

Area of Science:

• Biomedical Engineering
• Rheumatology
• Drug Discovery

Background:

• Current rheumatoid arthritis (RA) models struggle to replicate the complex in vivo microenvironment and cellular interactions.
• Accurate simulation of the synovium-cartilage interface is critical for understanding RA pathogenesis and developing effective therapies.

Purpose of the Study:

• To develop a human in vitro rheumatoid arthritis (RA) model that faithfully replicates the functional and compositional properties of the in vivo synovium-cartilage system.
• To establish a reliable platform for screening anti-arthritis drugs and understanding RA pathology.

Main Methods:

• A multi-layered in vitro model was created using chondrocytes in a type II collagen scaffold and a 3D-bioprinted hydrogel.
• The hydrogel incorporated fibroblast-like synoviocytes (FLS) and distinct macrophage populations (proinflammatory and barrier) to mimic the synovial lining.
• The model recapitulated key RA inflammatory processes, including mediator production, FLS invasion, macrophage polarization, and extracellular matrix degradation.

Main Results:

• The developed synovium-cartilage system accurately mimicked RA hallmarks, such as increased inflammatory mediators and enzyme production.
• The model demonstrated FLS invasion into cartilage, macrophage phenotypic shifts, and cartilage matrix depletion.
• Transcriptomic and proteomic analyses confirmed the model's accuracy in replicating in vivo RA conditions and drug responses.

Conclusions:

• This study presents a reliable human in vitro synovium-cartilage model for rheumatoid arthritis (RA) research.
• The model effectively recapitulates key pathological features of RA and enables preclinical drug screening.
• This platform offers a more accurate and accessible alternative to animal models for evaluating anti-RA therapeutics.