Cutting edge: ABIN-1 protects against psoriasis by restricting MyD88 signals in dendritic cells.

ABSTRACT: Psoriasis is a chronic, inflammatory skin disease caused by a combination of environmental and genetic factors. The Tnip1 gene encodes A20 binding and inhibitor of NF-?B-1 (ABIN-1) protein and is strongly associated with susceptibility to psoriasis in humans. ABIN-1, a widely expressed ubiquitin-binding protein, restricts TNF- and TLR-induced signals. In this study, we report that mice lacking ABIN-1 specifically in dendritic cells (DCs), ABIN-1(fl) CD11c-Cre mice, exhibit perturbed immune homeostasis. ABIN-1-deficient DCs display exaggerated NF-?B and MAPK signaling and produce more IL-23 than do normal cells in response to TLR ligands. Challenge of ABIN-1(fl) CD11c-Cre mice with topical TLR7 ligand leads to greater numbers of Th17 and TCR?? T cells and exacerbated development of psoriaform lesions. These phenotypes are reversed by DC-specific deletion of the TLR adaptor MyD88. These studies link ABIN-1 with IL-23 and IL-17, and they provide cellular and molecular mechanisms by which ABIN-1 regulates susceptibility to psoriasis.

SUBMITTER: Callahan JA 

PROVIDER: S-EPMC3702626 | biostudies-literature | 2013 Jul

REPOSITORIES: biostudies-literature