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Park, Boyoun; Buti, Ludovico; Lee, Sungwook; Matsuwaki, Takashi; Spooner, Eric; Brinkmann, Melanie M.; Nishihara, Masugi; Ploegh, Hidde L.
Immunity (Cambridge, Mass.), 04/2011, Letnik: 34, Številka: 4Journal Article
Toll-like receptor (TLR) signaling plays a critical role in innate and adaptive immune responses and must be tightly controlled. TLR4 uses LPS binding protein, MD-2, and CD14 as accessories to respond to LPS. We therefore investigated the presence of an analagous soluble cofactor that might assist in the recruitment of CpG oligonucleotides (CpG-ODNs) to TLR9. We report the identification of granulin as an essential secreted cofactor that potentiates TLR9-driven responses to CpG-ODNs. Granulin, an unusual cysteine-rich protein, bound to CpG-ODNs and interacted with TLR9. Macrophages from granulin-deficient mice showed not only impaired delivery of CpG-ODNs to endolysosomal compartments, but also decreased interaction of TLR9 with CpG-ODNs. As a consequence, granulin-deficient macrophages showed reduced responses to stimulation with CpG-ODNs, a trait corrected by provision of exogenous granulin. Thus, we propose that granulin contributes to innate immunity as a critical soluble cofactor for TLR9 signaling. ► Granulin binds TLR9 and CpG oligonucleotides ► Granulin is sufficient for intracellular localization of CpG-ODNs ► Granulin is a critical cofactor in enabling TLR9 signal transduction
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