To investigate the effects of silencing transforming growth factor-β activating kinase 1 (TAK1)on the expressions of IL-6 and IL-8 induced by TNF-α in fibroblast-like synoviocytes, and to explore the role of TAK1 in rheumatoid arthritis (RA).
The synthesized TAK1 siRNA and scrambled siRNA (ScRNA) were transferred into cultured RA fibroblast-like synoviocyte line MH7A by lipofectamine. The expressions of the pro-inflammatory mediator IL-6 and IL-8 and the levels of phospho-P38(p-P38), phospho-C-Jun NH2-terminal kinase(p-JNK), phospho-extracellular signal-regulated kinase(p-ERK), phospho-p65(p-p65) and nuclear factor of kappa light polypeptide gene enhancer in B-cells inhibitor, alpha(IκBa) were examined.
Silencing of TAK was demonstrated in synoviocytes transfected by TAK siRNA. TAK1 silencing markedly attenuated the expression of IL-6 and IL-8 in the presence of TNF-α. TAK1 silencing inhibited the activation of p38 and JNK MAPK. TAK1 silencing also inhibited activation of nuclear factor-κB (NF-κB).
TAK1 silencing attenuated the expression of IL-6 and IL-8 in synoviocytes induced by TNF-α 