U2AF2 and rheumatoid arthritis: DDX5 downregulation leads to a decrease in SRSF1 expression, thereby leading to the sacrifice of IL-36R sIL-36R, and sIL-36R promotes the inflammatory response of psoriasis and atopic dermatitis.415 Recently, a study analyzed the composition of AS in peripheral blood and synovial fluid leukocytes in patients with rheumatoid arthritis (RA), revealing that eight elements SNRNP70, SNRNP200, U2AF2, RNU4ATAC, RBM3, RBM17, KHDRBS1, and SRSF10 are regulated by anti-citrullinated protein antibodies (ACPA) during the treatment process of RA patients and are reversed by anti-TNF therapy.416