TRAIL signaling is pro-inflammatory and pro-viral in a murine model of rhinovirus 1B infection
AJP Lung Cellular and Molecular Physiology
Published online on November 11, 2016
Abstract
The aim of this study is to elucidate the role of TRAIL during rhinovirus (RV) infection in vivo. Naïve wild type and TRAIL-deficient (Tnfsf10-/-) BALB/c mice were infected intranasally with RV1B. In separate experiments, Tnfsf10-/- mice were sensitized and challenged via the airway route with house dust mite (HDM) to induce allergic airways disease and then challenged with RVIB or UV-RVIB. Airways hyperreactivity (AHR) was invasively assessed as total airways resistance in response to increasing methacholine challenge and inflammation assessed in bronchoalveolar lavage fluid (BALF) at multiple time points post infection. Chemokines were quantified by ELISA of whole lung lysates and viral load was determined by quantitative RT-PCR and tissue culture infective dose (TCID50). Human airway epithelial cells (BEAS2B) were infected with RV1B and stimulated with recombinant TRAIL or neutralizing anti-TRAIL antibodies and viral titer assessed by TCID50. HDM challenged Tnfsf10-/- mice were protected against RV-induced AHR and had suppressed cellular infiltration in the airways upon RV infection. Chemokine C-X-C-motif ligand 2 (CXCL2) production was suppressed in naïve Tnfsf10-/- mice infected with RV1B, with less RV1B detected 24 hours post-infection. This was associated with reduced apoptotic cell death and a reduction of interferon (IFN)-2/3 but not IFN-α or IFN-β. TRAIL stimulation increased, whereas anti-TRAIL antibodies reduced viral replication in RV1B-infected BEAS2B cells in vitro. In conclusion, TRAIL promotes RV-induced AHR, inflammation and RV1B replication, implicating this molecule and its downstream signaling pathways as a possible target for the amelioration of RV1B-induced allergic and non-allergic lung inflammation and AHR.