The suppression of innate immune response by human rhinovirus C

Rhinovirus C (RV-C), a newly identified group of human rhinoviruses (RVs), is associated with exacerbation of severe asthma. The type I interferon (IFN) response induced by this virus and the mechanisms of evasion of IFN-mediated innate immunity for RV-C remain unclear. In this study, we constructed a fulllength cDNA clone of RV-C (12651) from a clinical sample. IFN-beta mRNA and protein levels were not elevated in differentiated Human bronchial epithelial (HBE) cells at the air-liquid interface infected with RV-C, except in the early stage of infection. The ability to attenuate IFN-beta activation was ascribed to 3C(Pro) of RV-C, and the 40-His site of 3C(Pro) played an important role. Furthermore, RIG-I was degraded by 3C(Pro) in a caspase-dependent manner and 3C(pro) cleaved MAVS at 148 Q/A, which inhibited IFN signaling. Taken together, our results demonstrate the mechanism by which RV-C circumvents the production of type I IFN in infected cells. (C) 2017 Published by Elsevier Inc.