Fig. 6

Mechanism model of antigen-presenting effect of RA-FLSs induced by ferroptosis
The high level of ferroptosis in RA-FLSs causes the increase of intracellular PAD4 enzyme and citrullinated protein, which promote the function of endogenous antigen presenting and the aggregation of inflammatory factors. Ferrostatin-1 can inhibit the above reaction to achieve the therapeutic effect of RA