Evaluating the role of lipopolysaccharides in the joint: fibronectin as a novel protective mechanism
Authors' conclusion
LPS is prevalent in SF across various joint conditions but exhibits low bioactivity, indicating it is not a primary driver of joint inflammation. Fn plays a crucial role in sequestering and neutralising LPS within the synovial environment, offering a protective mechanism against LPS-induced inflammation.
Study context
- Population
- Synovial fluid (SF) samples from osteoarthritis (OA), RA and trauma patients; rat model of systemic lipopolysaccharides (LPS) exposure
- Participants
- 56 / 7 / 39
- Comparison
- OA vs Rheumatoid arthritis vs Trauma
- OAn = 56
- Rheumatoid arthritisn = 7
- Trauman = 39
- Outcome
- LPS in SF: presence, concentration, lipid A profile and bioactivity
Methodological detailsrat model, in vitro assays, 3D synovial membrane model
- Rat model
- In vitro assays
- 3D synovial membrane model
Main finding
As reported in the abstract
- LPS detected in all SF samples, with comparable concentrations and lipid A profiles across all groups
- Liquid chromatography-mass spectrometry (LC-MS) indicated higher LPS levels than standard endotoxin assays
- Minimal proinflammatory responses in bioactivity assays despite elevated LPS presence
- Prolonged systemic LPS exposure (32 days) did not induce OA-like changes in rat joints
- LPS colocalised with fibronectin (Fn) in the synovial membrane; Fn binding attenuated LPS bioactivity and hindered its migration in vitro
Original publication
Evaluating the role of lipopolysaccharides in the joint: fibronectin as a novel protective mechanism. RMD Open. Published 10 July 2025. doi:10.
Composed by AI from the published abstract and checked against it. How Briefs are made →