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Wang, Chenhui; Wu, Ling; Bulek, Katarzyna; Martin, Bradley N; Zepp, Jarod A; Kang, Zizhen; Liu, Caini; Herjan, Tomasz; Misra, Saurav; Carman, Julie A; Gao, Ji; Dongre, Ashok; Han, Shujie; Bunting, Kevin D; Ko, Jennifer S; Xiao, Hui; Kuchroo, Vijay K; Ouyang, Wenjun; Li, Xiaoxia
Nature immunology, 01/2013, Volume: 14, Issue: 1Journal Article
Act1 is an essential adaptor in interleukin 17 (IL-17)-mediated signaling and is recruited to the receptor for IL-17 after stimulation with IL-17. Here we found that Act1 was a 'client' protein of the molecular chaperone hsp90. The D10N variant of Act1 (Act1(D10N)) that is linked to susceptibility to psoriasis was defective in its interaction with hsp90, which resulted in a global loss of Act1 function. Act1-deficient mice modeled the mechanistic link between loss of Act1 function and susceptibility to psoriasis. Although Act1 was necessary for IL-17-mediated inflammation, Act1-deficient mice had a hyperactive response of the T(H)17 subset of helper T cells and developed spontaneous IL-22-dependent skin inflammation. In the absence of IL-17 signaling, IL-22 was the main contributor to skin inflammation, which provides a molecular mechanism for the association of Act1(D10N) with psoriasis susceptibility.
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