Injectable Erythrocyte Gel Loaded with Bulleyaconitine A for the Treatment of Rheumatoid Arthritis.

Rheumatoid arthritis (RA) is a systemic autoimmune disease with clinical manifestations including joint cartilage, synovitis, and bone damage. Here we developed an injectable erythrocyte gel loaded with Bulleyaconitine A (BLA) for the treatment of RA and demonstrated its anti-inflammatory effects in vivo and in vitro. In vitro experiments showed that BLA could effectively down-regulate the expression of pro-inflammatory factor in activated macrophages through the nuclear factor-κB (NF-κB) pathway. In vivo experiments have shown that the injection of BLA@RBCs in the inflammatory joints of CIA mice increases the local concentration of BLA in a long time. Improved therapeutic outcomes and reduced toxicity of BLA are demonstrated in our work. Together, the developed BLA@RBCs drug delivery system provides an alternative strategy to treat RA joints and shows high potential in clinical RA treatment.