MiR-1193 represses the proliferation and induces the apoptosis of interleukin-1β-treated fibroblast-like synoviocytes via targeting JAK3

Up-regulation of miR-1193 suppressed the proliferation and expedited the apoptosis of MH7A cells with IL-1β-induced inflammation through targeting JAK3, which might provide novel understanding on the mechanism underlying RA.

The dysregulated genes and microRNAs (miRNAs) were screened using the datasets of GSE12021 and GSE72564, while the upstream miRNA of JAK3 was forecasted by TargetScan. Then the MH7A cells were treated with interleukin-1β (IL-1β) to induce local inflammation. Double luciferase report assay was used to estimate the association between JAK3 and miR-1193. Flow cytometry and 3-[4,5-dimethylthiazol-2-yl]-2,5 diphenyl tetrazolium bromide (MTT) assays were taken to analyze the apoptosis and proliferation of MH7A cells with IL-1β-induced inflammation, respectively. The relative expression of genes and proteins were detected by quantitative real-time polymerase chain reaction and western blot analyses. Finally, rescue experiments were employed to explore the effects of miR-1193/JAK3 axis on IL-1β-induced inflammation.

JAK3 was notably up-regulated in RA, and was targeted and negatively regulated by miR-1193 which was lowly expressed in RA tissues and IL-1β-treated cells. MiR-1193 mimic significantly inhibited while miR-1193 inhibitor promoted the proliferation of MH7A cells with IL-1β-induced inflammation. Furthermore, overexpression of JAK3 presented auxo-action while depletion of JAK3 exhibited inhibitory effect on the proliferation of MH7A cells with IL-1β-induced inflammation, which could be weakened by miR-1193 mimic and miR-1193 inhibitor, respectively. Analogously, JAK3 recovered the cell proliferation that inhibited by miR-1193 mimic and inhibited cell apoptosis enhanced by miR-1193 mimic.