TLR3 and Arthritis: The present study was performed to find the potential miRNAs that can target the TLR3 molecule itself, verifying both the miRNA and TLR3 expression in macrophages during differentiation and pristane stimulation, as well as in the spleen of PIA rats, and observing the effects of an miR-26a mimic on TLR3 expression and arthritis severity in PIA rats.