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 TH17 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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We thank AML Laboratories and the Lerner Research Institute Histology Core for processing tissue samples for histology; J. Ma and W. Qian for technical support; and N. Volokh and D. Kish for discussions. Supported by the US National Institutes of Health (1R01NS071996 and 1P01 HL103453 to X.L.; and T32 GM007250 to the Case Western Reserve University Medical Scientist Training Program and T32 AI 89474-1 to the Case Western Reserve University Immunology Training Program, for support of L.W.) and the American Asthma Foundation (X.L.).
J.A.C., J.G. and A.D. are employees of Bristol-Meyers-Squibb; W.O. is an employee of Genentech.
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Wang, C., Wu, L., Bulek, K. et al. The psoriasis-associated D10N variant of the adaptor Act1 with impaired regulation by the molecular chaperone hsp90. Nat Immunol 14, 72–81 (2013). https://doi.org/10.1038/ni.2479
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