• Junyan Han, Azzeddine Dakhama, Yi Jia, Meiqin Wang, Wanjiang Zeng, Katsuyuki Takeda, Yoshiki Shiraishi, Masakazu Okamoto, Steven F Ziegler, and Erwin W Gelfand.
• Division of Cell Biology, Department of Pediatrics, National Jewish Health, Denver, CO, USA.
• J. Allergy Clin. Immunol. 2012 Nov 1; 130 (5): 1175-1186.e9.

BackgroundRecent studies revealed a critical role for thymic stromal lymphopoietin (TSLP) released from epithelial cells and OX40 ligand (OX40L) expressed on dendritic cells (DCs) in T(H)2 priming and polarization.ObjectivesWe sought to determine the importance of the TSLP-OX40L axis in neonatal respiratory syncytial virus (RSV) infection.MethodsMice were initially infected with RSV as neonates or adults and reinfected 5 weeks later. Anti-OX40L or anti-TSLP were administered during primary or secondary infection. Outcomes included assessment of airway function and inflammation and expression of OX40L, TSLP, and IL-12.ResultsOX40L was expressed mainly on CD11c(+)MHC class II (MHCII)(+)CD11b(+) DCs but not CD103(+) DCs. Treatment of neonates with OX40L antibody during primary RSV infection prevented the subsequent enhancement of airway hyperresponsiveness and the development of airway eosinophilia and mucus hyperproduction on reinfection. Administration of anti-TSLP before neonatal RSV infection reduced the accumulation of lung DCs, decreased OX40L expression on lung DCs, and attenuated the enhancement of airway responses after reinfection.ConclusionsIn mice initially infected as neonates, TSLP expression induced by RSV infection is an important upstream event that controls OX40L expression, lung DC migration, and T(H)2 polarization, accounting for the enhanced response on reinfection.Copyright © 2012 American Academy of Allergy, Asthma & Immunology. Published by Mosby, Inc. All rights reserved.

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