ABSTRACT
Objective To study the roles of miR-20a in lipopolysaccharide induced inflammation of A549 cells and the possible mechanisms.Method The miR-20a mimic/inhibitor were transfected into A549 cells, and the cells were stimulated using lipopolysaccharide for 24 h.Interleukin-6 ( IL-6) and IL-8 were detected at mRNA level and protein level using real-time PCR and ELISA method , respectively.Protein expression of apoptosis signal regulating kinase 1 (ASK1)、P38、P-P38、JNK and P-JNK were detected using Western blot. Result Compared to mimic negative control group , the levels of mRNA and protein expression of IL-6 and IL-8 in the mimic group were all significantly decreased ( P<0.05).Compared to inhibitor negative control group , the levels of mRNA and protein expression of IL-6 and IL-8 in the inhibitor group were all significantly increased (P<0.05).The levels of ASK1, P-P38 and P-JNK protein in the mimic group were significantly lower than the mimic negative control group (P<0.05);the level of protein expression of ASK1, P-P38 and P-JNK in the inhibitor group were all higher than the inhibitor negative control group (P<0.05).Conclusion The regulation of ASK1 by miR-20a may play an important role in the inflammation process of acute respiratory distress syndrome .