Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 108, Issue 31, Pages 12827-12832Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1105774108
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Funding
- National Institutes of Health [AI057555, AI064639, GM84459-S1, GM84459]
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Follicular helper T (Tfh) cells have a central role in mediating humoral immune responses. Generation of Tfh cells depends on both T-cell intrinsic factors and the supporting function of B cells, but the underlying molecular mechanisms are incompletely understood. Here we show that NF-kappa B-inducing kinase (NIK), a central component of the noncanonical NF-kappa B signaling pathway, is required for Tfh cell development. Unlike other known Tfh regulators, NIK acts by controlling the supporting function of B cells. NIK and its upstream BAFF receptor regulate B-cell expression of inducible costimulator ligand (ICOSL), a molecule required for Tfh cell generation. Consistently, injection of a recombinant ICOSL protein into NIK-deficient mice largely rescues their defect in Tfh cell development. We provide biochemical and genetic evidence indicating that the ICOSL gene is a specific target of the noncanonical NF-kappa B. Our findings suggest that the noncanonical NF-kappa B pathway regulates the development of Tfh cells by mediating ICOSL gene expression in B cells.
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