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Amplifying elements of arthritis and joint destruction
Wim B van den Berg1, Peter L van Lent, Leo A B Joosten
1Rheumatology Research and Advanced Therapeutics, Radboud University Nijmegen Medical Center, Geert Grooteplein 26, 6525 GA Nijmegen, The Netherlands. w.vandenberg@reuma.umcn.nl
Annals of the Rheumatic Diseases
|November 21, 2007
Summary
Rheumatoid arthritis (RA) involves joint inflammation and erosion. Immune complexes and T cell factors amplify joint damage, while innate pathways like TLR4 also contribute to erosive arthritis progression.
Area of Science:
- Immunology
- Rheumatology
- Pathology
Background:
- Rheumatoid arthritis (RA) is a systemic autoimmune disease causing chronic joint inflammation, bone, and cartilage erosion.
- Animal models reveal factors amplifying RA's destructive features, including immune complexes and T cell cytokines.
- Innate immune pathways also play a role in RA pathogenesis.
Purpose of the Study:
- To investigate the mechanisms amplifying joint erosion in rheumatoid arthritis.
- To elucidate the roles of FcgammaR, T cell factors, and innate pathways in RA pathogenesis.
- To explore therapeutic targets for suppressing erosive arthritis.
Main Methods:
- Studies utilized animal models of arthritis.
- Investigated the impact of immune complexes and FcgammaR signaling on joint erosion.
- Analyzed the contribution of T cell factors like IFNgamma and IL17.
- Assessed the role of innate pathways, including TLR4, in spontaneous and induced arthritis.
Main Results:
- Immune complexes enhance joint erosiveness, particularly cartilage erosion, which heavily relies on the FcgammaR pathway.
- T cell factors IFNgamma and IL17 amplify erosion by upregulating FcgammaRI and promoting granulocyte influx.
- Spontaneous arthritis in IL1Ra-/- mice is suppressed in germ-free or TLR4-deficient conditions, and TLR4 blockade reduces erosive arthritis.
Conclusions:
- FcgammaR signaling is critical for cartilage erosion in RA.
- T cell-derived cytokines and innate immune pathways, notably TLR4, significantly contribute to RA-associated joint destruction.
- Targeting FcgammaR, specific T cell factors, or TLR4 may offer therapeutic strategies for erosive arthritis.
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