Interleukin-27 impairs BCG antigen clearance and T cell stimulatory potential by neonatal dendritic cells.
Interleukin-27 impairs BCG antigen clearance and T cell stimulatory potential by neonatal dendritic cells.
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DOI:
10.1016/j.crmicr.2022.100176
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发表时间:
2023
影响因子:
--
通讯作者:
Robinson, Cory M.
中科院分区:
文献类型:
--
作者:
Bradford, Shelby D.;Witt, Michelle R.;Povroznik, Jessica M.;Robinson, Cory M.
Interleukin-27 expression increases in neonatal dendritic cells in response to BCG. The BCG vaccine is currently the only licensed vaccine available for tuberculosis. BCG is commonly administered to neonates in TB endemic areas. IL-27 limits BCG clearance by DCs and restricts interleukin-12 production. IL-27 opposes T cell stimulation by neonatal dendritic cells. Bacille Calmette Guérin (BCG) is a live-attenuated vaccine for protection against Mycobacterium tuberculosis. Despite high disease protection in infancy and early childhood, it generates poor long-term protection against pulmonary tuberculosis. We hypothesized that the unique immune profile that includes elevated interleukin (IL)-27, contributes to insufficient protection from routine neonatal BCG administration. Using a novel method to obtain neonatal progenitors, we showed that neonatal bone marrow-derived dendritic cells (BMDCs) increase production of IL-27 following BCG stimulation. To study the effect of IL-27 on BMDCs, we utilized mice deficient for IL-27 receptor-α (KO). We observed greater BCG clearance and elevated IL-12 production in the neonatal KO BMDCs compared to WT. BMDCs from KO neonates in turn stimulated more interferon-γ production from CD4+ T cells isolated from BCG-vaccinated mice than WT counterparts. To further confirm the importance of these findings, C57BL/6 mice were vaccinated as neonates in line with the approach to human vaccination in high TB burden regions. IL-27 levels progressively increased through 5 weeks and were significantly elevated in mice vaccinated with BCG compared to controls. The impact of IL-27 production on clearance of BCG was significant as KO mice cleared BCG from peripheral tissues that persisted in WT mice 5 weeks post-vaccination. These results are the first to highlight the suppressive role of IL-27 on DCs in the neonatal period and the impact on neonatal immune responses to BCG.
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