Journal
JOURNAL OF IMMUNOLOGY
Volume 185, Issue 9, Pages 5512-5521Publisher
AMER ASSOC IMMUNOLOGISTS
DOI: 10.4049/jimmunol.1002015
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- European Union within the New and Emerging Science and Technology
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IL-6-mediated T cell-driven immune responses are associated with signaling occurring through the membrane-bound cognate receptor alpha-chain (mIL-6R alpha). Once formed, IL-6-mIL-6R alpha complexes induce the homodimerization and subsequent phosphorylation of the ubiquitously expressed signal-transducing protein, gp130. This signaling event is defined as classical IL-6 signaling. However, many inflammatory processes assigned to IL-6 may be mediated via binding a naturally occurring soluble IL-6R alpha, which forms an agonistic complex (IL-6/soluble IL-6R alpha) capable of evoking responses on a wide range of cell types that lack mIL-6R alpha (IL-6 trans-signaling). To dissect the differential contribution of the two IL-6 signaling pathways in cell-mediated inflammatory processes, we pharmaceutically targeted each using two murine models of human arthritis. Whereas intra-articular neutralization of trans-signaling attenuated local inflammatory responses, the classical pathway was found to be obligate and sufficient to induce pathogenic T cells and humoral responses, leading to systemic disease. Our data illustrate that mechanisms occurring in the secondary lymphoid organs underlying arthropathies are mediated via the classical pathway of IL-6 signaling, whereas trans-signaling contributes only at the local site, that is, in the affected tissues. The Journal of Immunology, 2010, 185: 5512-5521.
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