How does METTL3 fuel rheumatoid arthritis FLSs?
METTL3 is upregulated in RA synovium and AIA rats; it boosts FLS inflammatory mediators and activation through NF-κB signalling.
Source
METTL3 Promotes Activation and Inflammation of FLSs Through the NF-κB Signaling Pathway in Rheumatoid Arthritis
What they did
Compared METTL3 in RA vs OA synovial tissues, manipulated METTL3 in human RA-FLSs and rat AIA-FLSs, and probed inflammatory cytokines, MMPs, and NF-κB pathway activity.
What they found
METTL3 was significantly upregulated in human RA synovium and the AIA model. Knockdown lowered IL-6, MMP-3, and MMP-9; overexpression raised them. Authors conclude METTL3 may promote FLS activation and inflammation via NF-κB.
The limits
What it doesn't show
Small human tissue N (RA 5, OA 3) and mechanistic cell/animal work do not prove a clinical therapy; NF-κB is implicated but not a full patient trial.
Key terms
- METTL3
- Core m6A writer methyltransferase implicated here in RA FLS biology.
- FLS
- Fibroblast-like synoviocytes that drive synovial hyperplasia and joint damage in RA.
- m6A
- N6-methyladenosine RNA modification whose writer complex includes METTL3.
- AIA
- Adjuvant-induced arthritis rat model of inflammatory arthritis.
- NF-κB
- Inflammatory signalling pathway activated downstream of METTL3 in FLSs.
- MMP-3/MMP-9
- Matrix metalloproteinases linked to FLS invasion and tissue destruction.
Flashcards
Research intelligence for this paper
See its role on concept claims, tensions it is part of, placement history, and related discoveries.
Quiz yourself
METTL3 levels in RA synovium were:
Common questions
Where is METTL3 upregulated?
Human RA synovial tissues and the rat AIA model.
What happens after METTL3 knockdown?
IL-6, MMP-3, and MMP-9 levels fall in RA/AIA FLSs.
Human tissue sample sizes?
RA n=5 and OA controls n=3 (ages 40–70).
Proposed pathway?
METTL3 may act via NF-κB to promote FLS activation/inflammation.