[HTML][HTML] A human homologue of the Drosophila Toll protein signals activation of adaptive immunity

R Medzhitov, P Preston-Hurlburt, CA Janeway Jr - Nature, 1997 - nature.com
R Medzhitov, P Preston-Hurlburt, CA Janeway Jr
Nature, 1997nature.com
Induction of the adaptive immune response depends on the expression of co-stimulatory
molecules and cytokines by antigen-presenting cells. The mechanisms that control the initial
induction of these signals upon infection are poorly understood. It has been proposed that
their expression is controlled by the non-clonal, or innate, component of immunity that
preceded in evolution the development of an adaptive immune system in vertebrates. We
report here the cloning and characterization of a human homologue of the Drosophila toll …
Abstract
Induction of the adaptive immune response depends on the expression of co-stimulatory molecules and cytokines by antigen-presenting cells. The mechanisms that control the initial induction of these signals upon infection are poorly understood. It has been proposed that their expression is controlled by the non-clonal, or innate, component of immunity that preceded in evolution the development of an adaptive immune system in vertebrates. We report here the cloning and characterization of a human homologue of the Drosophila toll protein (Toll) which has been shown to induce the innate immune response in adult Drosophila,,. Like Drosophila Toll, human Toll is a type I transmembrane protein with an extracellular domain consisting of a leucine-rich repeat (LRR) domain, and a cytoplasmic domain homologous to the cytoplasmic domain of the human interleukin (IL)-1 receptor. Both Drosophila Toll and the IL-1 receptor are known to signal through the NF-κB pathway,,. We show that a constitutively active mutant of human Toll transfected into human cell lines can induce the activation of NF-κB and the expression of NF-κB-controlled genes for the inflammatory cytokines IL-1, IL-6 and IL-8, as well as the expression of the co-stimulatory molecule B7.1, which is required for the activation of naive T cells.
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