Article: article from journal or magazin.
TNF-alpha-dependent loss of IKKbeta-deficient myeloid progenitors triggers a cytokine loop culminating in granulocytosis.
Proceedings of the National Academy of Sciences of the United States of America
Loss of IκB kinase (IKK) β-dependent NF-κB signaling in hematopoietic cells is associated with increased granulopoiesis. Here we identify a regulatory cytokine loop that causes neutrophilia in Ikkβ-deficient mice. TNF-α-dependent apoptosis of myeloid progenitor cells leads to the release of IL-1β, which promotes Th17 polarization of peripheral CD4(+) T cells. Although the elevation of IL-17 and the consecutive induction of granulocyte colony-stimulating factor compensate for the loss of myeloid progenitor cells, the facilitated induction of Th17 cells renders Ikkβ-deficient animals more susceptible to the development of experimental autoimmune encephalitis. These results unravel so far unanticipated direct and indirect functions for IKKβ in myeloid progenitor survival and maintenance of innate and Th17 immunity and raise concerns about long-term IKKβ inhibition in IL-17-mediated diseases.
Animals, Apoptosis/genetics, Apoptosis/immunology, Autoimmune Diseases of the Nervous System/genetics, Autoimmune Diseases of the Nervous System/immunology, Encephalitis/genetics, Encephalitis/immunology, I-kappa B Kinase/genetics, I-kappa B Kinase/immunology, Immunity, Innate/genetics, Immunity, Innate/immunology, Interleukin-17/biosynthesis, Interleukin-17/genetics, Interleukin-1beta/biosynthesis, Interleukin-1beta/genetics, Mice, Mice, Knockout, Myeloid Progenitor Cells/immunology, Myeloid Progenitor Cells/metabolism, Myelopoiesis/genetics, Myelopoiesis/immunology, NF-kappa B/genetics, NF-kappa B/immunology, Signal Transduction/genetics, Signal Transduction/immunology, Th17 Cells/immunology, Th17 Cells/metabolism, Tumor Necrosis Factor-alpha/biosynthesis, Tumor Necrosis Factor-alpha/genetics
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