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Enterovirus 71 (EV71) has caused major outbreaks of hand, foot and mouth disease. EV71 infections increase the production of many host cytokines and pro-inflammatory factors, including interleukin (IL)-6, IL-10 and COX-2. Some of these molecules could stimulate the signal transducer and activator of transcription 3 (STAT3), which plays a key role in regulating host immune responses and several viral diseases. However, the role of STAT3 in EV71 infection remains unknown. This study found that the phosphorylation levels of STAT3 (p Y705 -STAT3) are closely related to EV71 infection. Further experiments revealed that STAT3 exerts an anti-EV71 activity. However, the antiviral activity of STAT3 is partially antagonized by EV71-induced miR-124, which directly targets STAT3 mRNA. Similarly, IL-6R, the α-subunit of the IL-6 receptor complex, exhibits anti-EV71 activity and is directly targeted by the virus-induced miR-124. These results indicate that EV71 can evade host IL-6R- and STAT3-mediated antiviral activities by EV71-induced miR-124. This suggests that controlling miR-124 and the downstream targets, IL-6R and STAT3, might benefit the antiviral treatment of EV71 infection.

Enterovirus 71 antagonizes the antiviral activity of host STAT3 and IL-6R with partial dependence on virus-induced miR-124