Double-stranded RNA induces disproportionate expression of thymic stromal lymphopoietin versus interferon-beta in bronchial epithelial cells from donors with asthma.

Thorax
Lena UllerDonna E Davies

Abstract

Thymic stromal lymphopoietin (TSLP) is an epithelial cell-derived cytokine that strongly activates dendritic cells and can initiate allergic inflammation. Since exposure to rhinovirus or double-stranded (ds) RNA (a surrogate of viral infection) induces TSLP expression in bronchial epithelial cells (BECs), this cytokine may link innate antiviral responses and the type 2 adaptive immune response. As BECs from donors with asthma have a deficient interferon (IFN) response to rhinovirus infection, a study was undertaken to test the hypothesis that their antiviral response shows a bias towards TSLP production. Primary BECs were grown from subjects with asthma and healthy volunteers. After exposure to dsRNA, interleukin (IL)-8, IFNbeta and TSLP mRNA and protein expression were measured by RT-qPCR and ELISA, respectively. dsRNA dose-dependently increased IL-8 expression in BECs with no significant difference between the groups. However, BECs from subjects with asthma expressed less IFNbeta and more TSLP mRNA and protein in response to dsRNA than BECs from those without asthma (median (IQR) 57 (38-82) pg/ml vs 106 (57-214) pg/ml for IFNbeta (p<0.05) and 114 (86-143) pg/ml vs 65 (32-119) pg/ml for TSLP (p<0.05) in response to 10 microg/m...Continue Reading

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