Nair, Prema M., Starkey, Malcolm R., Haw, Tatt Jhong, Ruscher, Roland, Liu, Gang, Maradana, Muralidhara R., Thomas, Ranjeny, O’Sullivan, Brendan J., and Hansbro, Philip M. (2018) RelB-Deficient dendritic cells promote the development of spontaneous allergic airway inflammation. American Journal of Respiratory Cell and Molecular Biology, 58 (3). pp. 352-365.

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Abstract

RelB is a member of the NF-κB family, which is essential for dendritic cell (DC) function and maturation. However, the contribution of RelB to the development of allergic airway inflammation (AAI) is unknown. Here, we identify a pivotal role for RelB in the development of spontaneous AAI that is independent of exogenous allergen exposure. We assessed AAI in two strains of RelB-deficient (RelB−/−) mice: one with a targeted deletion and one expressing a major histocompatibility complex transgene. To determine the importance of RelB in DCs, RelB-sufficient DCs (RelB+/+ or RelB−/−) were adoptively transferred into RelB−/− mice. Both strains had increased pulmonary inflammation compared with their respective wild-type (RelB+/+) and heterozygous (RelB+/−) controls. RelB−/− mice also had increased inflammatory cell influx into the airways, levels of chemokines (CCL2/3/4/5/11/17 and CXCL9/10/13) and T-helper cell type 2–associated cytokines (IL-4/5) in lung tissues, serum IgE, and airway remodeling (mucus-secreting cell numbers, collagen deposition, and epithelial thickening). Transfer of RelB+/− CD11c+ DCs into RelB−/− mice decreased pulmonary inflammation, with reductions in lung chemokines, T-helper cell type 2–associated cytokines (IL-4/5/13/25/33 and thymic stromal lymphopoietin), serum IgE, type 2 innate lymphoid cells, myeloid DCs, γδ T cells, lung Vβ13+ T cells, mucus-secreting cells, airway collagen deposition, and epithelial thickening. These data indicate that RelB deficiency may be a key pathway underlying AAI, and that DC-encoded RelB is sufficient to restore control of this inflammation.

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